Jet Mechanics Qui: Auxiliary Power Unit Test

1. WHAT IS THE LOCATION OF THE APU FIRE EXTINGUISHER BOTTLE SELECT SWITCHES?

PILOT'S CENTER INSTRUMENT PANEL.

FLIGHT ENGINEER'S PANEL AND LOADMASTER'S FORWARD CONTROL PANEL

LOADMASTER'S FORWARD CONTROL PANEL AND PILOT'S CENTER PANEL

FLIGHT ENGINEER'S PANEL AND LOADMASTER'S AFT CONTROL PANEL

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-1, STEP 1B & T.O. 1C-5A-2-4CL-2, PAGE 3-9 STEP 19B

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-1, STEP 1B & T.O. 1C-5A-2-4CL-2, PAGE 3-9 STEP 19B

2. To operate the ATM's, PTU's or the engine pumps, the number two and three main fuel tanks must have a minimum of ________ of fuel to provide case drain fluid cooling for the hydraulic systems.

2000 lbs

4500 lbs

4000 gal

2000 gal

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-7, STEP 15

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-7, STEP 15

3. IF THE APU GENERATOR FAIL LIGHT COMES ON DURING APU OPERATION, WHAT MUST YOU DO?

PLACE GENERATOR SWITCH TO OFF POSITION.

SELECT THE OTHER APU GENERATOR.

PLACE GENERATOR CONTROL SWITCH TO OFF AND CONTINUE TO OPERATE.

IMMEDIATELY SHUT DOWN THE APU.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 11-27, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 11-27, CAUTION

4. DURING OPERATION OF THE ATM, A QUALIFIED OPERATOR WILL BE LOCATED WHERE?

AT THE PILOT'S STATION.

AT THE FORWARD LOADMASTER'S CONTROL PANEL.

AT THE FLIGHT ENGINEER'S STATION.

AT THE APU/ATM COMPARTMENT DOOR.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-4, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-4, CAUTION

5. What is to be done if the battery voltage check shows less than 22.5 volts in batery?

The battery shall be replaced or the battery electrical plug shall be disconnected.

The battery should be charged from external electric power before it is used.

The battery should be monitored closely during APU operation.

The battery shall be left connected but not used during APU operation.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.1, WARNING CHANGE 7 T.O. 1C-5A-2-4CL-2, PAGE 3-4, WARNING

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.1, WARNING CHANGE 7 T.O. 1C-5A-2-4CL-2, PAGE 3-4, WARNING

6. WHAT MUST BE AVAILABLE IF THE APU IS TO BE OPERATED WITH THE COMPARTMENT DOOR OPEN?

A FIRE GUARD MUST BE AVAILABLE WITH AN APU TESTER.

A FIRE GUARD MUST BE AVAILABLE WITH A TWO-WAY RADIO.

A FIRE GUARD WITH AN ADEQUATE FIRE EXTINGUISHER MUST BE AT THE COMPARTMENT.

A FIRE GUARD WITH AN ADEQUATE COMMUNICATION SYSTEM MUST BE AT THE COMPARTMENT.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 2-1 CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 2-1 CAUTION

7. WHAT MUST BE OPERATING BEFORE STARTING THE ATM'S TO RECHARGE THE APU START ACCUMULATORS?

SYSTEM PRESSURE MUST BE 300 PSI.

BLEED MANIFOLD PRESSURE MUST BE 50 PSI.

THE ELECTRIC SUCTION BOOST PUMPS BE ON.

ALL POWER TRANSFER SWITCHES MUST BE ON.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-3, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-3, CAUTION

8. What is the APU's maximum start time from start light to "ON SPEED" 0 degrees F and above.

20 seconds

60 seconds

30 seconds

80 seconds

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-4, step 3b. (1)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-4, step 3b. (1)

9. TO PREVENT APU HOT STARTS THE ACCUMULATOR SHOULD BE NO LESS THAN _________ PSI

2700

3000

2800

3150

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-17, STEP I (2), (3)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-17, STEP I (2), (3)

10. During APU start, which of the following EGT readings would indicate a malfuction?

630-691 degrees C

691-715 degrees C

716-824 degrees C

325-575 degrees C

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4 ITEM 3.A (1)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4 ITEM 3.A (1)

11. On initial start with the compartment door open following APU fuel/oil system component removal or installation, a fire guard with a serviseable fire extinguisher will be required to leak check the APU during start. That individual's duties are________?

The fire guard will be positioned at the APU and will establish communication with the flight engineer's station.

During start the fire guard will closely examine the APU for evidence of leaks especially from fuel, oil, or hydraulic fluid.

If any leaks or substandard conditions are noted, the fire guard will notify the flight engineer's station. The start will be aborted and the leaks or substandard conditions corrected prior to attempting another start.

The fire guard will comply with all of the above.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-23, WARNING

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-23, WARNING

12. DURING NORMAL OPERATION, THE APU GENERATOR AC LOAD-METER SHOULD NOT EXCEED WHICH LIMIT?

LOAD-METER READING 0.5

LOAD-METER READING 1.0

LOAD-METER READING 1.25

LOAD-METER READING 1.50

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 11-27, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 11-27, CAUTION

13. For cooling purposes, the APU should be run unloaded for _________ prior to shut down?

30 seconds

1 minute

2 minutes

3 minutes

The APU should be run unloaded for 2 minutes prior to shut down for cooling purposes. Running the APU without any load allows the internal components to cool down before shutting off, preventing any potential damage or overheating. This cooling period ensures that the APU is properly cooled and ready for the next operation.

Explanation

The APU should be run unloaded for 2 minutes prior to shut down for cooling purposes. Running the APU without any load allows the internal components to cool down before shutting off, preventing any potential damage or overheating. This cooling period ensures that the APU is properly cooled and ready for the next operation.

14. Where are the APU fire extinguisher bottles located on the aircraft?

In the lower aft corner of the #4 main landing gear wheel well.

In the lower aft corner of the #2 main landing gear wheel well.

Inboard side of #2 and #3 engine pylons.

In the right aft APU compartment.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 10-2, PARA 10-3

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 10-2, PARA 10-3

15. When starting an APU without external power (BATTERY START) what equipment must be available?

A fire guard with a portable fire extiguisher.

A fire guard with a two-way radio.

A fire truck shall stand by until power is available.

A fire truck shall stand by during starting and single APU operation.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-1, WARNING

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-1, WARNING

16. Normal ATM pumps pressure is__________?

2800-3000 psi

2850-3150 psi

2850-3050 csi

2800-3150 psi

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-5, step 8

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-5, step 8

17. Which hydraulic systems are used to pressurize the APU accumulators?

Left APU accumulator from #4 system and right APU accumulator from #1 system.

Left APU accumulator from #2 system and right APU accumulator from #3 system.

Left APU accumulator from #1 system and right APU accumulator from #4 system.

Left APU accumulator from #3 system and right APU accumulator from #2 system.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-5, step 8a

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-5, step 8a

18. WITH THE APU OPERATING, WHAT IS THE MAX CONTINUOUS EGT?

691 DEGREES C

715 DEGREES C

630 DEGREES C

714 DEGREES C

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4 ITEM 3A (4)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4 ITEM 3A (4)

19. WITH EITHER APU GENERATOR SUPPLYING AIRCRAFT POWER, THE OPERATOR WILL FIND ALL BUSES POWERED?

EXCEPT #2 AND #3 MAIN AC BUSES.

EXCEPT THE MONITOR BUSES.

EXCEPT THE DC POWERED BUSES.

EXCEPT THE #2 AND #3 DC BUSES

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-6, NOTE

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-6, NOTE

20. What position must the battery switch be in for a fire handle shut down?

Must be in NORM or STBY position: if modified by TCTO 1C-5-736; ON position.

Must be in NORM position, if modified by TCTO 1C-5-736; ON position.

Must be in OFF position,if modified by TCTO 1C-5-736 ON position.

Must be in EXT PWR position, if modified by TCTO 1C-5-736; ON position.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.3, WARNING CHANGE 10

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.3, WARNING CHANGE 10

21. WHAT EFFECT WOULD HAVING THE AIRCRAFT ON JACKS, OR TWO MAIN LANDING GEAR CROSS KNEELED, OR #1 TOUCHDOWN RELAY CIRCUIT BREAKER PULLED HAVE ON THE APU?

THE AUDIBLE HORN WILL NOT SOUND.

THE APU DOOR WILL NOT OPEN FULLY AND THE AUDIBLE HORN WILL NOT SOUND.

THE APU LOW OIL PRESSURE SWITCH WILL BE OVERRIDDEN, PROHIBITING LOW OIL PRESSURE PROTECTION; THE APU DOOR WILL NOT OPEN FULLY; THE APU FIRE WARNING AUDIBLE HORN WILL NOT SOUND.

THE APU LOW OIL PRESSURE SWITCH WILL BE OVERRIDDEN, PROHIBITING LOW OIL PRESSURE PROTECTION; THE APU FIRE WARNING AUDIBLE HORN WILL NOT SOUND.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-24, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-24, CAUTION

22. During APU start, what is the maximum duration for transient EGT between 715 degrees C and 824 degrees C?

10 seconds

20 seconds

30 seconds

No limit

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3, ITEM 3.A.(2)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3, ITEM 3.A.(2)

23. How long can an ATM operate without normal hydraulic pressure?

5 seconds

15 seconds

30 seconds

60 seconds

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-4, CAUTION

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 5-4, CAUTION

24. Why must one battery be serviceable and connected to the battery bus during operation of the APU?

To provide emergency power for radio operation.

To provide power for APU fire extiguisher and emergency APU shut down.

To provide power for APU fire extiguisher and emergency radio operation.

To provide emergency radio operation and power for emergency APU shut down.

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.3, WARNING

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 3-6.3, WARNING

25. HOW LONG CAN THE APU OPERATE WITH THE EGT BETWEEN 691 DEGREES C AND 746 DEGREES C?

30 SECONDS

1 MINUTE

2 MINUTES

3 MINUTES

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4, ITEM 3.A (3)

Explanation

REFERENCE: T.O. 1C-5A-2-4CL-2, PAGE 4-3 - 4-4, ITEM 3.A (3)