CDC 2r051 Vol. 4 Maintenance Performance Measurement

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Questions and Answers
  • 1. 

    (601) Which of the following is not a level of maintenance?

    • A.

      Base.

    • B.

      Depot.

    • C.

      Intermediate

    • D.

      Organizational

    Correct Answer
    A. Base.
    Explanation
    The correct answer is "Base." In maintenance, there are different levels of maintenance that are performed on equipment or systems. These levels include depot maintenance, intermediate maintenance, and organizational maintenance. However, "Base" is not a level of maintenance. It is possible that "Base" refers to a specific location or facility, but it is not a level of maintenance itself.

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  • 2. 

    (601) What is considered the highest level of maintenance for more complex repairs?

    • A.

      Base.

    • B.

      Depot.

    • C.

      Inermediate.

    • D.

      Organizational.

    Correct Answer
    B. Depot.
    Explanation
    Depot maintenance is considered the highest level of maintenance for more complex repairs. Depot maintenance involves extensive repairs and overhauls that cannot be performed at lower levels of maintenance. It typically includes major repairs, component replacements, and refurbishments of equipment. This level of maintenance is usually conducted at specialized facilities or depots, where highly skilled technicians and specialized equipment are available. Depot maintenance ensures that equipment is restored to its original condition and maintains its operational capability.

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  • 3. 

    (602) Which maintenance category consists of time compliance technical order (TCTO) actions which can be accomplished with the skills possessed by a unit?

    • A.

      Off-equipment, Air Force Materiel Command (AFMC).

    • B.

      On-equipment, AFMC.

    • C.

      Off-equipment, operating command.

    • D.

      On-equipment, operating command.

    Correct Answer
    D. On-equipment, operating command.
    Explanation
    On-equipment, operating command is the correct answer because this maintenance category refers to actions that can be accomplished by the skills possessed by a unit. This means that the maintenance can be performed by the personnel within the unit without requiring specialized skills or equipment from external sources such as the Air Force Materiel Command (AFMC).

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  • 4. 

    (602) Which maintenance category consists of those tasks that cannot be done on the end item but are within the capability of the skills and equipment possessed by a unit?

    • A.

      On-equipment, Air Materiel Command (AFMC).

    • B.

      Off-equipment, AFMC

    • C.

      On-equipment, operating command.

    • D.

      Off-equipment, operating command.

    Correct Answer
    D. Off-equipment, operating command.
    Explanation
    Off-equipment, operating command refers to the maintenance tasks that can be performed by a unit using their skills and equipment, but not directly on the end item. This means that the maintenance tasks are done on components or systems that are removed from the end item for repair or replacement. This category allows units to carry out necessary maintenance without having to rely on external support or higher-level maintenance organizations.

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  • 5. 

    (603) Which maintenance category includes correcting discrepancies discovered during flight?

    • A.

      Unscheduled.

    • B.

      Preventive.

    • C.

      Debriefing.

    • D.

      Scheduled.

    Correct Answer
    A. Unscheduled.
    Explanation
    The correct answer is Unscheduled. Unscheduled maintenance refers to the correction of discrepancies or issues that are discovered during flight. This type of maintenance is not planned or scheduled in advance, but rather occurs as a result of unexpected problems or malfunctions that are identified during the course of a flight. It is necessary to address these issues promptly to ensure the safety and continued operation of the aircraft.

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  • 6. 

    (604) “To minimize the length of time that an aircraft is out of commission due to a scheduled inspection” is the objective of what inspection concept?

    • A.

      Isochronal

    • B.

      Periodic

    • C.

      Phased

    • D.

      Depot

    Correct Answer
    C. Phased
    Explanation
    The objective of the phased inspection concept is to minimize the length of time that an aircraft is out of commission due to a scheduled inspection. This means that the phased inspection concept is designed to efficiently and effectively carry out inspections on an aircraft while minimizing the impact on its operational availability.

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  • 7. 

    (605) All aircraft, no matter what inspection concept applies, are required to have how many calendar inspections?

    • A.

      One

    • B.

      Two

    • C.

      Three

    • D.

      Four

    Correct Answer
    B. Two
    Explanation
    All aircraft, regardless of the inspection concept applied, are required to have two calendar inspections. This means that there are specific intervals of time in which these inspections must be conducted to ensure the safety and proper functioning of the aircraft. These inspections are necessary to identify any potential issues or maintenance needs that may arise over time.

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  • 8. 

    (605) Which inspection status is affected by the 30 or 90 day inspection?

    • A.

      Preflight

    • B.

      Thruflight

    • C.

      Hourly postflight

    • D.

      Home station check

    Correct Answer
    D. Home station check
    Explanation
    The inspection status that is affected by the 30 or 90 day inspection is the Home station check. This means that the Home station check needs to be conducted every 30 or 90 days, depending on the specific requirements. This inspection ensures that the aircraft is in proper working condition and meets all necessary safety standards before it can continue its operations.

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  • 9. 

    (606) What changes to baseline computer programs are normally announced by a time compliance technical order (TCTO)?

    • A.

      Price-only

    • B.

      Software-only

    • C.

      Hardware-only

    • D.

      Contractor-only

    Correct Answer
    B. Software-only
    Explanation
    A time compliance technical order (TCTO) is typically used to announce changes to baseline computer programs that involve software updates. This means that the correct answer is "Software-only."

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  • 10. 

    (607) What is the number of authorized basic time compliance technical order (TCTO) categories?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    C. 3
    Explanation
    There are three authorized basic Time Compliance Technical Order (TCTO) categories.

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  • 11. 

    (607) What are the authorized types of time compliance technical orders (TCTOs)?

    • A.

      Safety, routine, and urgent.

    • B.

      Immediate, safety, and urgent.

    • C.

      Immediate, routine, and safety.

    • D.

      Immediate, routine, and urgent.

    Correct Answer
    D. Immediate, routine, and urgent.
    Explanation
    The authorized types of time compliance technical orders (TCTOs) are immediate, routine, and urgent. Immediate TCTOs are issued for conditions that could result in injury or loss of life if not corrected immediately. Routine TCTOs are issued for conditions that could result in injury or damage to equipment if not corrected within a specified time frame. Urgent TCTOs are issued for conditions that could result in injury or damage to equipment if not corrected within a specified time frame, but the urgency is not as immediate as for immediate TCTOs.

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  • 12. 

    (607) To permit simultaneous release of two or more time compliance technical orders (TCTO) requiring work in the same general area, procuring activities are authorized to withhold the release of non-safety routine action TCTOs for a maximum of

    • A.

      30 days

    • B.

      60 days

    • C.

      90 days

    • D.

      120 days

    Correct Answer
    C. 90 days
    Explanation
    Procuring activities are authorized to withhold the release of non-safety routine action TCTOs for a maximum of 90 days. This means that if there are multiple time compliance technical orders (TCTOs) that require work in the same general area, the release of non-safety routine action TCTOs can be delayed for up to 90 days. This allows for the simultaneous release of multiple TCTOs, streamlining the process and ensuring efficient completion of the required work.

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  • 13. 

    (608) Which logistics indicator shows a unit’s ability to keep equipment in a ready status?

    • A.

      System reliability.

    • B.

      Airframe capability.

    • C.

      Base level repair capability.

    • D.

      Maintenance scheduling effectiveness.

    Correct Answer
    A. System reliability.
    Explanation
    System reliability is the logistics indicator that shows a unit's ability to keep equipment in a ready status. This means that the unit's equipment is consistently functioning properly and available for use when needed. The other options, such as airframe capability, base level repair capability, and maintenance scheduling effectiveness, may also be important factors in logistics management, but they do not specifically address the ability to keep equipment ready for use.

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  • 14. 

    (608) The data to calculate system capability rates is obtained from

    • A.

      The major command (MAJCOM).

    • B.

      The weekly maintenance plan.

    • C.

      Materiel supply liaison.

    • D.

      Debriefing.

    Correct Answer
    D. Debriefing.
    Explanation
    The data to calculate system capability rates is obtained from debriefing. Debriefing is a process where individuals or teams provide feedback and information about a particular event or activity. In this context, it refers to obtaining data and information about the system's performance and capabilities after a specific operation or mission. This information is crucial for evaluating the system's effectiveness and identifying any areas that need improvement.

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  • 15. 

    (609) If repair is not authorized at base level who forwards the item to contract maintenance or Air Force Materiel Command (AFMC) depot?

    • A.

      Supply

    • B.

      Workcenter

    • C.

      Maintenance analysis

    • D.

      Plans and scheduling

    Correct Answer
    A. Supply
    Explanation
    If repair is not authorized at base level, the item is forwarded to Supply. Supply is responsible for managing and providing the necessary resources and materials for maintenance and repair operations. They will ensure that the item is sent to contract maintenance or the Air Force Materiel Command (AFMC) depot for further repair and maintenance.

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  • 16. 

    (609) What action taken codes are used to compute base repair capability rates?

    • A.

      A, F, G, K, L, V, Z.

    • B.

      A, F, G, K, L, B, P.

    • C.

      A, F, G, K, L, Z.

    • D.

      A, F, B, G, K, L.

    Correct Answer
    C. A, F, G, K, L, Z.
  • 17. 

    (610) When computing maintenance scheduling effectiveness rates weights are usually assigned to show

    • A.

      The degree of importance of a task.

    • B.

      The sequence of task accomplishment.

    • C.

      How many tasks are scheduled next month.

    • D.

      How many tasks were scheduled last month.

    Correct Answer
    A. The degree of importance of a task.
    Explanation
    Weights are usually assigned when computing maintenance scheduling effectiveness rates to show the degree of importance of a task. This means that certain tasks may be considered more critical or crucial than others, and therefore, they are given a higher weight in the calculation of the effectiveness rate. By assigning weights, the scheduling process can prioritize and focus on the most important tasks, ensuring that they are completed efficiently and effectively.

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  • 18. 

    (611) Delayed discrepancies are referred to as

    • A.

      Awaiting parts (AWP) or awaiting defer (AWD).

    • B.

      Awaiting parts (AWP) or awaiting maintenance (AWM).

    • C.

      Awaiting defer (AWD) or awaiting maintenance (AWM).

    • D.

      Awaiting parts (AWP) or awaiting deferred discrepancy (ADD).

    Correct Answer
    B. Awaiting parts (AWP) or awaiting maintenance (AWM).
  • 19. 

    (611) If they are not able to schedule or combine deferred discrepancies with more extensive maintenance actions, maintenance schedulers should?

    • A.

      Defer the discrepancies for 5 calendar days.

    • B.

      Defer the discrepancies for 7 calendar days.

    • C.

      Routinely schedule the aircraft to work the delays.

    • D.

      Defer the discrepancies until there are more discrepancies to work.

    Correct Answer
    C. Routinely schedule the aircraft to work the delays.
    Explanation
    Maintenance schedulers should routinely schedule the aircraft to work the delays if they are not able to schedule or combine deferred discrepancies with more extensive maintenance actions. This means that instead of deferring the discrepancies for a specific number of days or waiting for more discrepancies to occur, they should regularly allocate time for addressing the delays in the aircraft's maintenance schedule. This approach ensures that the delays are consistently addressed and resolved, rather than being postponed or accumulated.

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  • 20. 

    (612) What mission capability status code is the sum of not mission capable supply (NMCS) and not mission capable both (NMCB) and reflects total not mission capable (NMC) aircraft limitations due to supply?

    • A.

      Fully mission capable (FMC).

    • B.

      Partial mission capable (PMC).

    • C.

      Not mission capable both (NMCB).

    • D.

      Total not mission capable supply (TNMCS).

    Correct Answer
    D. Total not mission capable supply (TNMCS).
    Explanation
    The correct answer is Total not mission capable supply (TNMCS). This mission capability status code reflects the total number of aircraft that are not mission capable due to supply issues. It includes both not mission capable supply (NMCS) and not mission capable both (NMCB) aircraft limitations. This code indicates that the aircraft cannot perform its mission due to supply-related problems.

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  • 21. 

    (613) What deviation category is used when an aircraft is cancelled due to bad weather?

    • A.

      Local

    • B.

      Chargeable

    • C.

      Nonchargeable

    • D.

      Higher headquarters

    Correct Answer
    C. Nonchargeable
    Explanation
    When an aircraft is cancelled due to bad weather, it falls under the nonchargeable deviation category. This means that the cancellation is not counted against the pilot or the airline and does not result in any penalties or charges. Bad weather is typically considered an uncontrollable factor that is beyond the control of the pilot or the airline, and therefore, they are not held responsible for the cancellation.

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  • 22. 

    (613) The total number of cancellations can be obtained from the

    • A.

      Daily Flying Schedule.

    • B.

      Operational Event Report.

    • C.

      Monthly Maintenance Plan.

    • D.

      Accomplishment Utilization Report (AUR).

    Correct Answer
    D. Accomplishment Utilization Report (AUR).
    Explanation
    The Accomplishment Utilization Report (AUR) is the correct answer because it provides information about the total number of cancellations. The AUR is a report that tracks the utilization of resources and accomplishments within a specific timeframe. It includes data on various operational events, including cancellations. Therefore, by referring to the AUR, one can obtain the total number of cancellations. The other options, such as the Daily Flying Schedule, Operational Event Report, and Monthly Maintenance Plan, may provide relevant information but do not specifically focus on cancellations.

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  • 23. 

    (613) When computing for the Flying Scheduling Effectiveness rate, what is subtracted from the total number of scheduled sorties?

    • A.

      Total deviations

    • B.

      Number of cancelled takeoffs

    • C.

      Total chargeable deviations only

    • D.

      Tota nonchargeable deviations only.

    Correct Answer
    A. Total deviations
    Explanation
    When computing for the Flying Scheduling Effectiveness rate, the total number of scheduled sorties is subtracted by the total deviations. This means that any deviations from the scheduled sorties, whether chargeable or nonchargeable, are taken into account when calculating the rate. The total deviations represent any changes or deviations from the original schedule, which could include cancelled takeoffs or any other type of deviation.

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  • 24. 

    (613) Which command uses the departure reliability rate?

    • A.

      Air Combat Command (ACC)

    • B.

      Air Mobility Command (AMC)

    • C.

      Air Force Space Command

    • D.

      Air Force Materiel Command

    Correct Answer
    B. Air Mobility Command (AMC)
    Explanation
    The command that uses the departure reliability rate is the Air Mobility Command (AMC). This command is responsible for providing air transportation and aerial refueling capabilities to support global mobility operations. The departure reliability rate is a measure of how often aircraft depart on time, which is crucial for ensuring efficient and effective transportation of personnel and cargo.

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  • 25. 

    (613) When used for the departure reliability rate, the standard for on-time departure is within

    • A.

      10 minutes of the scheduled departure time.

    • B.

      14 minutes of the scheduled departure time.

    • C.

      20 minutes of the scheduled departure time.

    • D.

      24 minutes of the scheduled departure time.

    Correct Answer
    B. 14 minutes of the scheduled departure time.
    Explanation
    The correct answer is 14 minutes of the scheduled departure time. This means that a flight is considered to have an on-time departure if it departs within 14 minutes of the scheduled departure time.

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  • 26. 

    (614) When we compute utilization under the flying hour program, the two ways we compute for the utilization (UTE) rate are?

    • A.

      Sortie and hourly.

    • B.

      Program and actual.

    • C.

      Effective and ineffective.

    • D.

      Authorized and chargeable.

    Correct Answer
    A. Sortie and hourly.
    Explanation
    The correct answer is sortie and hourly. Utilization (UTE) rate can be computed using two methods: sortie and hourly. The sortie method calculates the utilization rate based on the number of sorties (flights) completed within a specific period of time. The hourly method calculates the utilization rate based on the number of hours the equipment or aircraft is in use. Both methods provide different perspectives on the utilization of resources and can be used to analyze and manage the efficiency of operations.

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  • 27. 

    (614) What is the definition of aircraft availability?

    • A.

      The historical percentage of sorties lost to causes outside of unit control.

    • B.

      The percentage of a fleet in a depot possessed or non-mission capable status.

    • C.

      The percentage of a fleet not in a depot possessed or non-mission capable status.

    • D.

      A measure of the health of the air mobility system and reflects the percentage of on-time departures.

    Correct Answer
    C. The percentage of a fleet not in a depot possessed or non-mission capable status.
    Explanation
    Aircraft availability refers to the percentage of a fleet that is not in a depot possessed or non-mission capable status. This means that the aircraft is in a condition where it can be used for its intended mission. This measure indicates the readiness and operational capability of the fleet.

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  • 28. 

    (614) What report is used to calculate aircraft availability?

    • A.

      Fix Time Report (FTR).

    • B.

      Equipment Status Report (TRIC: ESR).

    • C.

      Aerospace Vehicle Status Report (TRIC: AVS).

    • D.

      Accomplishment Utilization Report (TRIC: AUR).

    Correct Answer
    C. Aerospace Vehicle Status Report (TRIC: AVS).
    Explanation
    The Aerospace Vehicle Status Report (AVS) is used to calculate aircraft availability. This report provides information on the status of aerospace vehicles, including their availability for use. It allows for tracking and monitoring the availability of aircraft, ensuring that they are ready and operational when needed. The AVS report is a valuable tool for maintenance and operational planning, as it provides data on the availability of aircraft for missions and tasks.

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  • 29. 

    (614) What factor represents a historical percentage of scheduled sorties lost to causes outside of unit control?

    • A.

      Abort

    • B.

      Spare

    • C.

      Attrition

    • D.

      Utilization

    Correct Answer
    C. Attrition
    Explanation
    Attrition represents a historical percentage of scheduled sorties lost to causes outside of unit control. This factor reflects the number of sorties that were unable to be completed due to various reasons such as equipment failure, weather conditions, or other unforeseen circumstances. It is an important factor to consider when analyzing the effectiveness and efficiency of a unit's operations.

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  • 30. 

    (614) In determining the spare factor, what do you compare to the number of historical sorties scheduled?

    • A.

      Number of flyable aircraft

    • B.

      Number of non-flyable aircraft

    • C.

      Number of 1st sortie logistics losses

    • D.

      Number of 2nd sortie logistics losses

    Correct Answer
    C. Number of 1st sortie logistics losses
    Explanation
    The spare factor is determined by comparing the number of 1st sortie logistics losses to the number of historical sorties scheduled. This comparison helps to assess the effectiveness of the logistics system in minimizing losses and ensuring that an adequate number of spare aircraft are available for future sorties.

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  • 31. 

    (614) Which of the following is not a factor used for computing manhour per flying hour?

    • A.

      Flying hours

    • B.

      Operating hours

    • C.

      On-equipment manhours

    • D.

      Off-equipment manhours

    Correct Answer
    B. Operating hours
    Explanation
    Operating hours is not a factor used for computing manhour per flying hour. Manhour per flying hour is a measure of the amount of labor required to maintain and operate an aircraft for a certain period of time. Factors such as flying hours, on-equipment manhours, and off-equipment manhours are typically used to calculate this measure. Operating hours, on the other hand, refers to the total number of hours the aircraft has been in operation, including both flying and non-flying hours. While operating hours may be relevant for other calculations or maintenance purposes, it is not directly used for computing manhour per flying hour.

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  • 32. 

    (614) What is the first position of the work unit code (WUC) for general support work included in the computation for manhours per flying hour?

    • A.

      0

    • B.

      1

    • C.

      2

    • D.

      3

    Correct Answer
    A. 0
    Explanation
    The first position of the work unit code (WUC) for general support work included in the computation for manhours per flying hour is 0.

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  • 33. 

    (615) What code is used in the computation of the break rate?

    • A.

      Fix code 3

    • B.

      Cap code 3

    • C.

      Landing code 3

    • D.

      Not reparable this station (NRTS) code 3

    Correct Answer
    C. Landing code 3
    Explanation
    The code used in the computation of the break rate is "Landing code 3". This suggests that the break rate is calculated based on the number of landings made by the aircraft. The code indicates that the aircraft has made a successful landing without any major issues or repairs needed.

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  • 34. 

    (615) Which rate is used to measure speed of repair and equipment maintainability?

    • A.

      Fix rate

    • B.

      Break rate

    • C.

      Utilization rate

    • D.

      Mission capable rate

    Correct Answer
    A. Fix rate
    Explanation
    The fix rate is used to measure the speed of repair and equipment maintainability. It refers to the rate at which repairs are made to equipment or machinery when they break or malfunction. A higher fix rate indicates that repairs are being done quickly and efficiently, resulting in less downtime and improved equipment availability.

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  • 35. 

    (615) When an aircraft lands with a code 3 landing status, what maintenance status code is entered in Integrated Maintenance Data System (IMDS)?

    • A.

      Partial mission capable (PMC).

    • B.

      Fully mission capable (FMC).

    • C.

      Not mission capable (NMC).

    • D.

      Cap code 3.

    Correct Answer
    C. Not mission capable (NMC).
    Explanation
    When an aircraft lands with a code 3 landing status, it means that the aircraft is not mission capable. Therefore, the maintenance status code entered in Integrated Maintenance Data System (IMDS) would be "Not mission capable (NMC)".

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  • 36. 

    (615) What are the three time frames used in the fix rate formula?

    • A.

      2, 4, or 8 hours.

    • B.

      4, 6, or 8 hours.

    • C.

      4, 8, or 10 hours.

    • D.

      4, 8, or 12 hours.

    Correct Answer
    D. 4, 8, or 12 hours.
    Explanation
    The correct answer is 4, 8, or 12 hours. This means that the fix rate formula can be calculated using any of these three time frames.

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  • 37. 

    (615) The total abort rate is a combination of

    • A.

      Air and ground abort.

    • B.

      Air abort, late takeoff, and ground abort.

    • C.

      Air abort, total deviations, and ground abort.

    • D.

      Air abort, ground abort, and maintenance cancellation.

    Correct Answer
    A. Air and ground abort.
    Explanation
    The correct answer is "air and ground abort." This means that the total abort rate includes both air aborts and ground aborts. Air abort refers to a situation where an aircraft has to abort its takeoff or landing due to a technical issue or safety concern. Ground abort, on the other hand, refers to an abort that occurs before the aircraft even takes off, such as when there is a problem with the aircraft on the ground. By including both air and ground aborts in the total abort rate, a comprehensive picture of the number of aborts can be obtained.

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  • 38. 

    (615) A repeat discrepancy occurs how many sorties after a problem is originally reported?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    A. 1
    Explanation
    A repeat discrepancy occurs after one sortie following the original problem report.

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  • 39. 

    (615) High repeat and recur rates may indicate a lack of

    • A.

      Available aircraft.

    • B.

      Available spare parts.

    • C.

      Qualified supervisors.

    • D.

      Thorough troubleshooting.

    Correct Answer
    D. Thorough troubleshooting.
    Explanation
    High repeat and recur rates may indicate a lack of thorough troubleshooting. This means that when issues or problems occur repeatedly or frequently, it suggests that the troubleshooting process has not been thorough enough to identify and address the root cause of the problem. If thorough troubleshooting had been conducted, the underlying issues would have been identified and resolved, resulting in lower repeat and recur rates. Therefore, the correct answer is thorough troubleshooting.

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  • 40. 

    (615) Base supply uses which rate to indicate depot support?

    • A.

      Break

    • B.

      Utilization

    • C.

      Mission capable

    • D.

      Cannibalization

    Correct Answer
    D. Cannibalization
    Explanation
    Base supply uses the rate of cannibalization to indicate depot support. Cannibalization refers to the practice of removing parts from one piece of equipment to repair or maintain another piece of equipment. This rate indicates the extent to which this practice is being utilized in depot support.

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  • 41. 

    (616) Mean time to repair (MTTR) is expressed in

    • A.

      Seconds.

    • B.

      Minutes.

    • C.

      Hours.

    • D.

      Days.

    Correct Answer
    C. Hours.
    Explanation
    MTTR stands for Mean Time to Repair, which is a measure of the average time it takes to repair a system or equipment after a failure. Since time is being measured, the correct unit for expressing MTTR is hours.

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  • 42. 

    (616) Which computation provides you with the average equipment operating time before a failure occurs?

    • A.

      Fix rate.

    • B.

      Break rate.

    • C.

      Man-hour per flying hour.

    • D.

      Mean time between failure (MTBF).

    Correct Answer
    D. Mean time between failure (MTBF).
    Explanation
    The correct answer is Mean time between failure (MTBF). MTBF is a measure used to determine the average time that a piece of equipment operates before experiencing a failure. It is calculated by dividing the total operating time by the number of failures that occur. This measurement is important in assessing the reliability and performance of equipment, as a higher MTBF indicates a longer average operating time before failure.

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  • 43. 

    (616) In the Integrated Maintenance Data System (IMDS) what is the maximum number of days allowed for calculating the mean time between failure (MTBF)?

    • A.

      30

    • B.

      60

    • C.

      90

    • D.

      180

    Correct Answer
    D. 180
    Explanation
    In the Integrated Maintenance Data System (IMDS), the maximum number of days allowed for calculating the mean time between failure (MTBF) is 180. This means that the system takes into account the failures that occur within a 180-day period to calculate the average time between failures.

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  • 44. 

    (616) Which mission performance indicator is used to measure the average time between failures of mission-essential systems?

    • A.

      Mean time to repair (MTTR).

    • B.

      Mean time between critical failure (MTBCF).

    • C.

      Mean time between downing events (MTBDE).

    • D.

      Mean time between maintenance actions (MTBMA).

    Correct Answer
    B. Mean time between critical failure (MTBCF).
    Explanation
    MTBCF is the correct answer because it measures the average time between critical failures of mission-essential systems. This indicator helps to assess the reliability and availability of these systems by calculating the average time they can operate without experiencing a critical failure. By monitoring MTBCF, organizations can identify potential issues and take preventive measures to minimize downtime and ensure the continuous functioning of mission-essential systems.

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  • 45. 

    (616) What maintenance events are included when computing for the mean time between maintenance actions (MTBMA)?

    • A.

      Scheduled only.

    • B.

      Unscheduled only.

    • C.

      Both scheduled and unscheduled.

    • D.

      On-equipment and off-equipment.

    Correct Answer
    C. Both scheduled and unscheduled.
    Explanation
    The mean time between maintenance actions (MTBMA) is a measure of the average time that elapses between maintenance events. It includes both scheduled and unscheduled maintenance events. Scheduled maintenance refers to planned maintenance activities that are performed at regular intervals, while unscheduled maintenance refers to unexpected repairs or replacements that are necessary due to equipment failures or malfunctions. By including both types of maintenance events, the MTBMA provides a comprehensive measure of the reliability and performance of the equipment or system being analyzed.

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  • 46. 

    (616) Which of the following gives the average time for end items and is an indication of component overall performance?

    • A.

      Mean time to repair (MTTR).

    • B.

      Mean time between failure (MTBF).

    • C.

      Mean time between critical failure (MTBCF).

    • D.

      Mean time between maintenance actions (MTBMA).

    Correct Answer
    D. Mean time between maintenance actions (MTBMA).
    Explanation
    Mean time between maintenance actions (MTBMA) gives the average time for end items and is an indication of component overall performance. It measures the average time between maintenance actions required for the end items, which includes both scheduled and unscheduled maintenance. This metric is important in assessing the reliability and availability of the components and can help in identifying areas for improvement in the maintenance process. It provides valuable insights into the overall performance of the components and helps in optimizing maintenance strategies.

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  • 47. 

    (617) The two cornerstones of maintenance metrics are fleet availability and

    • A.

      Maintenance capability.

    • B.

      Deployment execution.

    • C.

      Program execution.

    • D.

      Airlift capability.

    Correct Answer
    C. Program execution.
    Explanation
    The correct answer is program execution. Program execution refers to the successful implementation and completion of maintenance programs within a fleet. It involves the efficient and effective execution of maintenance tasks, adherence to maintenance schedules, and achieving desired program outcomes. Fleet availability and maintenance capability are important factors in measuring the success of program execution, but they are not the cornerstones themselves.

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  • 48. 

    (617) Which of these is a lagging indicator under fleet availability?

    • A.

      Mission capable rate.

    • B.

      Code 3 break rate.

    • C.

      8-hour fix rate.

    • D.

      Air abort rate.

    Correct Answer
    A. Mission capable rate.
    Explanation
    The mission capable rate is a lagging indicator under fleet availability because it measures the percentage of time that an aircraft is available and capable of performing its intended mission. This metric is calculated based on the number of aircraft that are fully mission capable divided by the total number of aircraft in the fleet. It provides a retrospective view of the fleet's availability and takes into account factors such as maintenance, repairs, and operational readiness. Lagging indicators like the mission capable rate are useful for evaluating past performance and identifying areas for improvement in fleet availability.

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  • 49. 

    (618) Which fix rate time interval is reported for all aircraft other than fighters?

    • A.

      Four

    • B.

      Eight.

    • C.

      Twelve.

    • D.

      Fourteen.

    Correct Answer
    C. Twelve.
    Explanation
    The correct answer is Twelve. This means that for all aircraft other than fighters, the fix rate time interval reported is twelve. This indicates that these aircraft have a specific time interval at which they are fixed or maintained. The question is asking for the duration of this fix rate time interval, and the correct answer is twelve.

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  • 50. 

    (618) By consolidating feasible cannibalizations (CANN) to a few aircraft when practical, maintenance can keep which mission capable rate low?

    • A.

      Fully mission capable (FMC).

    • B.

      Partial mission capable (PMC).

    • C.

      Total not mission capable both (TNMCB).

    • D.

      Total not mission capable supply (TNMCS).

    Correct Answer
    D. Total not mission capable supply (TNMCS).
    Explanation
    By consolidating feasible cannibalizations to a few aircraft when practical, maintenance can keep the Total not mission capable supply (TNMCS) rate low. This means that by using parts from non-mission capable aircraft to repair others, the supply of spare parts is maintained, reducing the number of aircraft that are not mission capable due to lack of necessary supplies.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Sep 05, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 13, 2013
    Quiz Created by
    Chris7781
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