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Jpierce > APU > Flashcards

APU Flashcards

1
Q

When must a frozen door check be done?

A

When temps are below 40 F

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2
Q

What does QSAS stand for?

A

Quick Start APU System

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3
Q

Does the fire control valve need to be open or closed?

A

Open

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4
Q

How can you tell if the fire control valve is open or closed?

A

If red marks are visible, the vavle is closed

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5
Q

APU battery must be replaced if voltage is below what?

A

21 volts

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6
Q

What could happen if voltage is low and you press to test the fire loop?

A

You may discharge fire agent

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7
Q

APU battery voltage should be what?

A

27 +- 3 volts

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8
Q

When APU is running in the normal mode, what should the EGT be approximately?

A

1200 F

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9
Q

What happens if you flip the bullet switch up at the crew entry door?

A

Both APUs start in the normal mode

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10
Q

Ensure generator switch is in what position prior to starting?

A

Off

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11
Q

Can you start an APU without a generator in the “gen only” mode?

A

Yes

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12
Q

What type of oil does the APU use?

A

MIL-PRF-23699

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13
Q

How can you tell the APU has air available?

A

The RDY light is illuminated and EGT is 1200 F

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14
Q

Which APU is #1 and which is #2?

A

1 is aft. #2 is forward

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15
Q

What is the oil capacity for each APU?

A

4 quarts

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16
Q

Ensure QSAS accumulators read what PSI when fully pressurized?

A

3000 +- 350

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17
Q

How can you find out for sure which APU the generator is on?

A

By momentarily placing the generator switch to “test”

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18
Q

Where can you start the APU in the “gen only” mode from?

A

Only from the APU cabinet

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19
Q

To run APU in “gen only” mode the mode select switch must be held in gen only until tachomter indicates what RPM %?

20
Q

Tachometer should reach 100% within how long?

A

11 seconds

21
Q

How long should the APU run prior to upgrading to the normal mode?

22
Q

With the APU running, hearing protection is required inside the aircraft when working aft of what station?

23
Q

What is the minimum fuel to operate APU and which tank feeds it?

A

2000 pounds. Main tank #2

24
Q

If power is interrupted, what position must the battery switch be set prior to reestablishing power?

25
Q

What 3 areas on the plane can you start the APU from?

A

Crew entry door. APU cabinet. Pilots knee

26
Q

When APU is running in the EWO mode, what should the EGT approximately be?

27
Q

Before applying APU electrical power, what should volts AC and hertz read?

A

200 +- 10 volts. 400 +- 5 cycles

28
Q

After TCTO 1C-135-1547, what circuit breaker(s) must be pulled prior to a frozen door check?

A

On P-14 Battery circuit panel APU start 1 (J6) and APU start 2 (K6)

29
Q

During a frozen door check, if excessive force is felt to move handle, what must be done?

A

Perform deicing procedure using an H-1 heater

30
Q

On cargo compartment A/C panel, put cargo temperature control switch to what position?

31
Q

Ensure air conditioning master switch is in what position?

32
Q

When checking oil on APU, care must be taken when removing the dipstick. Why?

A

To ensure O-ring is not dropped

33
Q

How do you downgrade from the normal mode?

A

Momentarily move switch to gen only position

34
Q

During a frozen door check, what may happen if pins are not fully disengaged from the actuator arm prior to moving door handle?

A

Shear pins may shear

35
Q

Which hydraulic system pressurizes the APU?

36
Q

What circuit breakers must be pulled (open) in preperation for applying APU electrical power?

A 
Engine fuel flow (E25)
Engine Idle 1 (A2)
Engine Idle 2 (B2)
Engine Idle 3 (C2)
Engine Idle 4 (D2)
Fuel Xfer Ind LTS (A10)
Fuel Xfer Ind (D8)
37
Q

How many fire extinguishers does the APU have?

38
Q

Where are the breakers located that you pull prior to a frozen door check?

A

P-14 Circuit breaker panel in the bathroom

39
Q

What is the very first thing you should do before starting the APU start task?

A

Check the AFTO 781 Forms

40
Q

Ensure start switches are off to prevent what?

A

Inadvertant motoring

41
Q

Starting an APU with frozen doors can do what?

A

Shear door pins

42
Q

-Warning- Do not apply QSAS electrical power by use of?

A

Load bank switch

43
Q

What door must be closed for APU power to be applied?

A

The external power door

44
Q

Prior to starting an APU, if no electrical power is currently applied, what must be done?

A

Place battery power switch to emergency for a minimum of 30 seconds. Then return to the off position

45
Q

When APU is running in the gen only mode, what should the EGT be approximately?

46
Q

If the APU is started in the EWO mode, how long must you wait before starting it in EWO again?

A

5-35 minutes unless a real world EWO situation occurs

Jpierce (5 decks)

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