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P8 PC > Auxiliary Power Unit > Flashcards

Auxiliary Power Unit Flashcards

1
Q

Where is the APU located

A

A. In the tail of the aircraft (NATOPS 2-47)

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2
Q

What type of APU is installed in the P8-A? What are the general specifications?

A

A. The Honeywell 131-9 (B)

B. It is a self-contained gas turbine engine installed within a fireproof compartment.

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3
Q

Where is the APU powered on, and what’s checklist is used for operation?

A

A. In the flight deck.

B. NATOPS PCL (A1-P8AAA-NFM-500)

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4
Q

What are the MCDUs? Where are they located?

A

A. Multifunction Control Display Units

B. Located in the flight deck on the forward aisle stand. (NATOPS 18-10)

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5
Q

What are the steps to find APU specific data? What APU data can be read from the MCDU?

A

A. Do the APU BITE procedure, and follow the AMM II for IDENT/CONFIG page. (AMM II Task 49-61-00-700-801)

B. The first page shows the APU S/N, Hours of APU Operation, APU Cycles, and hours since installation on the plane. (AMM II Task 49-61-00-700-801)

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6
Q

How do you determine the oil quantity of the APU? What are the oils levels? What do the quantity indications mean?

A

A. From the MCDU. If it is necessary to e the OIL QUANTITY REPORT page from the main menu, push the line select key adjacent to OIL QUANTITY. (AMM II TASK 49-61-00-700-801)

B. The oil level will show ADD, FULL, LOW, or UNKNOWN.

C. FULL-No servicing required. ADD or LOW condition, notify Maintenance Control to initiate a discrepancy. UNKNOWN-APU is operating (AMMII TASK 49-61-00-790-801

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7
Q

Where is the inlet door for the APU located?

A

A. Aft starboard side of the tail section. (AMM I Chapter 49)

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8
Q

Where is the eductor located? What is its function?

A

A. It is located above the APU exhaust.

B. The eductor moves air through the oil cooler to control the oil temperature and takes in ambient air to cool the APU compartment. (AMM I Chapter 49-00-00-002)

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9
Q

Where is the APU exhaust located?

A

A. Directly below the eductor, in the tail section. (AMM I Chapter 49)

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10
Q

How long may the APU start cycle take?

A

A. It may take as long as 120 seconds.

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11
Q

What conditions would cause the APU to automatically shut down?

A

A. Overspeed conditions, low oil pressure, high oil temperature, APU fire, fire control unit failure, EGT exeedance, miscellaneous system faults monitored bye the ECU.

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12
Q

What is the ECU and what are the primary functions.

A

A. Electronic Control Unit

B. It monitors and controls the APU, providing automatic shutdown protection. Also automatically controls APU speed through the electronic fuel control, either shedding electrical load, or reducing bleed air extraction when speed or EGT exceed acceptable levels. ( NATOPS 2-50)

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13
Q

What are the three requirements for APU operation?

A

A. APU fire switch on the overheat/fire protection panel must be IN. APU fire control handle on the APU ground control panel must be IN. Battery must be IN.

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14
Q

How man APU fire bottles are there and where are they located?

A

A. One. Located in the horizontal stabilizer access panel. (AMM I 26-22-00-010)

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15
Q

What are the maintenance messages for the APU and what colors correspond to the maintenance messages?

A

A. Maintenance Light (blue), Fault Light (amber), and Over-speed Light (amber). (AMM I Chapter 49-00-00-002)

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16
Q

What is the minimum operation frequency of the APU provided that the aircraft has not operated and the APU is not preserved?

A

A. A minimum of one time of each month at a minimum of 5 minutes at no load condition. NOTE: If in a corrosive environment of high moisture and salt: it is recommended to start the APU once week. (AMM II Chapter 49-11-00-869-891)

17
Q

What is the minimum amount of fuel required to be in the Main 1 tank to keep the boost pup inlet covered and why?

A

A. 425+/- 25lbs. The fuel vapors could ignite and cause a fire. (AMM II Chapter 49-11-00-860-801)

18
Q

What is the normal rate of speed of the APU

A

A. At 100% Italy is 48,800RPM. (AMM I Chapter 49 Page 3)

19
Q

Where is the fuel initially pulled from? What kind of pump is used?

A

A. Main Tank one. DC Fuel Pump. (AMM I 28-25-00-007)

20
Q

What is the total amount of oil the APU can hold?

A

A. 8.7 qts (5.7 quarts in the oil sump and approximately 3qts in oil cooler and lines.) (AMM I Chapter 49-90-00-001)

21
Q

Where does ECU receive its power from?

A

A. Hot Battery Bus. (AMM I Chapter 49-60-00-003)

22
Q

What happens at 60% during the APU start up?

A

A. The ECU de-energized the ignition unit. (AMM I, Chapter 49-00-00-006)

23
Q

What is the 60 second cool down period used for?

A

A. To prevent coking in the turbine bearing and fuel nozzles. (AMM I Chapter 49-00-00-007)

24
Q

The APU air I let door shuts at what percent?

A

A. 30% percent or immediately during and APU fire. (AMM I Chapter 49-00-00-007)

25
Q

How does one perform and APU fire-detection yes?

A

A. Reference the PCL as required. (A1-P8AAA-NFM-500)

26
Q

How long after starting the APU do you wait to apply bleed air?

A

A. The APU should operate for 1 minute prior to being used as a bleed air source. (A1-P8AAA-NFM-500)

27
Q

What circuits breaker needs to be pulled in order to have Radio communications? Can media be online when this breaker is pulled?

A

A. COMS 3

B. No, media cannot be online or loaded.

P8 PC (4 decks)

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