B737 - Day 5 - Pneumatics, Air Conditioning

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  • 1/21 Questions

    What are the sources of engine bleed air?

    • 4th compressor section
    • 5th and 9th stage of compressor section.
    • 5th compressor section
    • 9th compressor section
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B737 - Day 5 - Pneumatics, Air Conditioning - Quiz
About This Quiz

This quiz assesses knowledge on the B737's pneumatics and air conditioning systems, focusing on engine bleed air sources, valve operations, and system pressure controls. It is crucial for understanding aircraft operation and safety.

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  • 2. 

    With both engine bleed switches ON, pack switches selected to AUTO, and the isolation valve switch in AUTO, what position will the isolation valve be in?

    • Closed

    • On

    Correct Answer
    A. Closed
    Explanation
    When both engine bleed switches are ON, the isolation valve is controlled by the pack switches and the isolation valve switch. In this scenario, with the pack switches selected to AUTO and the isolation valve switch in AUTO, the isolation valve will be in the Closed position. This means that the isolation valve is closed and isolating the bleed air from the engines from the rest of the system.

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  • 3. 

    Illumination of the right WING-BODY OVERHEAT light indicates that an overheat has occurred in which duct?

    • Left engine strut, Left inboard wing leading edge, or Left side air conditioning bay.

    • Left wing tank

    • Right engine strut, right inboard wing leading edge, or right side air conditioning bay.

    • Right wing tank

    Correct Answer
    A. Right engine strut, right inboard wing leading edge, or right side air conditioning bay.
    Explanation
    The correct answer is right engine strut, right inboard wing leading edge, or right side air conditioning bay. This is because the question asks about the duct in which an overheat has occurred when the right WING-BODY OVERHEAT light is illuminated. The right engine strut, right inboard wing leading edge, and right side air conditioning bay are all possible locations where a duct could be present and experience an overheat.

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  • 4. 

    When will Engine BLEED TRIP OFF light illuminate?

    • When the engine bleed temperature exceeds a pre-determined limit

    • When EGT exceeds a pre-determined limit

    • When the engine bleed pressure exceeds a pre-determined limit

    • When the engine bleed Temperature or pressure exceeds a pre-determined limit

    Correct Answer
    A. When the engine bleed Temperature or pressure exceeds a pre-determined limit
    Explanation
    The Engine BLEED TRIP OFF light will illuminate when either the engine bleed temperature or pressure exceeds a pre-determined limit. This means that if either the temperature or pressure of the engine bleed system goes beyond the specified threshold, the light will come on to indicate a potential issue.

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  • 5. 

    What will be the position of the trip air modulating valve after the associated ZONE TEMP light is illuminated?

    • Closed

    • Open

    Correct Answer
    A. Closed
    Explanation
    After the associated ZONE TEMP light is illuminated, the trip air modulating valve will be in the closed position. This is because the ZONE TEMP light indicates that the temperature in the zone is at the desired level, and therefore, there is no need for the valve to be open and allow more air flow. Closing the valve helps maintain the temperature and prevents unnecessary air flow.

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  • 6. 

    The TRIP RESET on the 737 800 will reset 3 situations which are?

    • BLEED TRIP OFF, PACK TRIP OFF and ZONE TEMP lights

    • Exessive EGT, pressure and temperature

    • BLEED TRIP OFF, DUAL BLEED and ZONE TEMP lights

    • Exessive temp on both engines and APU

    Correct Answer
    A. BLEED TRIP OFF, PACK TRIP OFF and ZONE TEMP lights
    Explanation
    The correct answer is BLEED TRIP OFF, PACK TRIP OFF, and ZONE TEMP lights. This means that when the TRIP RESET is activated on the 737-800, it will reset these three situations.

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  • 7. 

    On the ground, with the APU bleed switch ON, if either pack switch is set to HIGH, the APU will which mode?

    • High flow

    • Normal flow

    • Auto flow

    • OFF

    Correct Answer
    A. High flow
    Explanation
    When the APU bleed switch is turned on and either pack switch is set to HIGH, the APU will be in High flow mode. This means that the air conditioning packs will receive a higher flow of air from the APU, resulting in increased cooling capacity.

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  • 8. 

    Which valve controls the associated pneumatic system pressure?

    • The engine bleed valve

    • APU bleed valve

    • Mix Manifold

    • X-bleed valve

    Correct Answer
    A. The engine bleed valve
    Explanation
    The engine bleed valve controls the associated pneumatic system pressure. When the valve is open, bleed air from the engine is released, reducing the pressure in the pneumatic system. When the valve is closed, the pressure is maintained. This valve is crucial in regulating the pressure in the pneumatic system to ensure proper functioning of various components and systems that rely on compressed air, such as air conditioning, pressurization, and hydraulic systems.

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  • 9. 

    Conditioned air from the Left Pack is supplied to?

    • The Mix Manifold

    • The mix Manifold and the Cabin

    • The Mix Manifold and the Flight Deck

    • The Cabin

    Correct Answer
    A. The Mix Manifold and the Flight Deck
    Explanation
    The conditioned air from the Left Pack is supplied to both the Mix Manifold and the Flight Deck. The Mix Manifold is responsible for distributing the conditioned air to various systems and components within the aircraft, while the Flight Deck refers to the cockpit area where the pilots operate the aircraft. Therefore, the conditioned air from the Left Pack is directed to both the Mix Manifold and the Flight Deck to ensure proper ventilation and temperature control in these areas.

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  • 10. 

    In the AUTO mode of operation, when does the pressurization start (##)?

    • When AUTO button is pressed.

    • When TOGA buttons are pressed

    • When aircraft gets airborne

    • On the ground when the thrusts levers are advanced to set take-off power (when both N1s are greater than 60% & both N2s are greater than 89% for 1.5 seconds)

    Correct Answer
    A. On the ground when the thrusts levers are advanced to set take-off power (when both N1s are greater than 60% & both N2s are greater than 89% for 1.5 seconds)
  • 11. 

    In flight, with flaps retracted, both pack switches in AUTO, but only one pack operating, what flow mode will be in?

    • OFF mode

    • It will schedule to ON flow mode

    • It will schedule to AUTO mode

    • It will schedule to high flow mode

    Correct Answer
    A. It will schedule to high flow mode
    Explanation
    When the flaps are retracted and both pack switches are in AUTO, but only one pack is operating, the flow mode will schedule to high flow mode. This means that the operating pack will provide maximum air flow to the cabin, compensating for the reduced cooling capacity due to the retracted flaps.

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  • 12. 

    When are the RAM DOOR FULL OPEN lights illuminated?

    • On the ground or in flight

    • On the ground or in flight with the flaps extended

    • In flight with flaps extended

    • In flight with gear down

    Correct Answer
    A. On the ground or in flight with the flaps extended
    Explanation
    The RAM DOOR FULL OPEN lights are illuminated when the flaps are extended, regardless of whether the aircraft is on the ground or in flight. This indicates that the ram air door, which provides additional airflow to the engine during certain flight conditions, is fully open.

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  • 13. 

    With the isolation valve switch in the AUTO position, what selection either pack switch will open the isolation valve?

    • OFF

    • Auto

    • ON

    Correct Answer
    A. OFF
    Explanation
    When the isolation valve switch is in the AUTO position, selecting the OFF position for either pack switch will open the isolation valve. This means that turning off either pack will cause the isolation valve to open, allowing air to flow freely between the two packs.

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  • 14. 

    When will the DUAL BLEED light illuminate?

    • If both engine bleeds are on

    • N°2 engine bleed ON and APU bleed ON.

    • N°1 engine bleed ON and APU bleed ON.

    • N°1 engine bleed ON and APU bleed OFF.

    Correct Answer
    A. N°1 engine bleed ON and APU bleed ON.
    Explanation
    The DUAL BLEED light will illuminate when both the N°1 engine bleed and APU bleed are turned on.

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  • 15. 

    A leak of hot air from the APU bleed duct will cause the illumination of which light?

    • Left WING BODY OVERHEAT

    • Right WING BODY OVERHEAT

    • OVERHEAT light

    • FAULT light

    Correct Answer
    A. Left WING BODY OVERHEAT
    Explanation
    A leak of hot air from the APU bleed duct can cause the left wing body to overheat. This is because the hot air escaping from the duct can come into contact with the left wing body, leading to an increase in temperature. As a result, the left WING BODY OVERHEAT light will illuminate to indicate the overheating condition.

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  • 16. 

    What causes a PACK light to illuminate?

    • Failure of both primary and standby pack controls, or the overheat in the cooling cycle. The associated pack valve closes.

    • Both packs in operation

    • A fault in with either on or both packs

    • Failure of both primary and standby pack controls.

    Correct Answer
    A. Failure of both primary and standby pack controls, or the overheat in the cooling cycle. The associated pack valve closes.
    Explanation
    When both primary and standby pack controls fail or when there is an overheat in the cooling cycle, the associated pack valve closes. This closure causes the PACK light to illuminate.

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  • 17. 

    Automatic switching to the APU high flow mode occurs when the APU bleed switch is ON, either pack switch is set to ---------, and the aircraft is positioned ------------?

    • LOW, on the ground

    • HIGH, in flight

    • HIGH, on the ground

    • Low, in flight

    Correct Answer
    A. HIGH, on the ground
    Explanation
    When the APU bleed switch is ON and either pack switch is set to HIGH, the automatic switching to the APU high flow mode occurs. This happens when the aircraft is positioned on the ground.

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  • 18. 

    With the pressurization mode selector in AUTO, what indicates a failure of the selected controller?

    • FAULT light illuminates.

    • MASTER CAUTION and FAULT lights illuminate.

    • MASTER CAUTION and ALTN lights illuminate.

    • The AUTO FAIL and ALTN lights illuminate.

    Correct Answer
    A. The AUTO FAIL and ALTN lights illuminate.
    Explanation
    When the pressurization mode selector is set to AUTO, the AUTO FAIL and ALTN lights illuminating indicates a failure of the selected controller. This means that there is a malfunction in the automatic pressurization system, and the alternate (ALTN) mode has been activated as a result. The combination of these two lights serves as an indication to the pilot that there is a problem with the pressurization system and that the alternate mode is being used.

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  • 19. 

    Below 28 000ft and if AUTO mode, the pressurization system controller schedules a constant When does the OFF SCHED DESCENT light illuminate?cabin altitude during the cruise, based on what differential pressure?

    • 7.8 psi

    • 7.45 psi

    • 8.35 psi

    Correct Answer
    A. 7.45 psi
    Explanation
    The correct answer is 7.45 psi. The OFF SCHED DESCENT light illuminates when the cabin altitude exceeds the maximum allowed value. In AUTO mode, the pressurization system controller schedules a constant cabin altitude during the cruise, and this is based on a differential pressure of 7.45 psi.

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  • 20. 

    In flight, with the recirculation fans in the AUTO position (##):

    • The right recirculation fan operates if both packs are operating unless both PACK switches are selected to HIGH

    • Both fans are operating normally.

    • Both fans are operating in HIGH mode

    • The left recirculation fan operates if both packs are operating unless both PACK switches are selected to HIGH

    Correct Answer
    A. The right recirculation fan operates if both packs are operating unless both PACK switches are selected to HIGH
    Explanation
    The correct answer is "The right recirculation fan operates if both packs are operating unless both PACK switches are selected to HIGH." This means that the right recirculation fan will only operate when both packs are operating, unless both PACK switches are selected to HIGH. This indicates that the fan operates based on the status of the packs and the position of the PACK switches.

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  • 21. 

    Before Engine Start, what Bleed Duct Pressure should be indicated?

    • It is an on demand supply, however it does read approx. 15 psi

    • It is an on demand supply, however it does read approx 30 psi

    • It is an on demand supply, however it does read approx 25 psi

    • It is an on demand supply, however it does read approx 45 psi

    Correct Answer
    A. It is an on demand supply, however it does read approx. 15 psi
    Explanation
    Before engine start, the bleed duct pressure should be indicated at approximately 15 psi. This indicates that it is an on-demand supply, meaning that the pressure is only provided when needed.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 11, 2012
    Quiz Created by
    SasjaZ

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