APU

Question 1

When must a frozen door check be done?

Answer 1

When temps are below 40 F

Question 2

What does QSAS stand for?

Answer 2

Quick Start APU System

Question 3

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

Answer 3

Open

Question 4

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

Answer 4

If red marks are visible, the vavle is closed

Question 5

APU battery must be replaced if voltage is below what?

Answer 5

21 volts

Question 6

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

Answer 6

You may discharge fire agent

Question 7

APU battery voltage should be what?

Answer 7

27 +- 3 volts

Question 8

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

Answer 8

1200 F

Question 9

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

Answer 9

Both APUs start in the normal mode

Question 10

Ensure generator switch is in what position prior to starting?

Answer 10

Off

Question 11

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

Answer 11

Yes

Question 12

What type of oil does the APU use?

Answer 12

MIL-PRF-23699

Question 13

How can you tell the APU has air available?

Answer 13

The RDY light is illuminated and EGT is 1200 F

Question 14

Which APU is #1 and which is #2?

Answer 14

1 is aft. #2 is forward

Question 15

What is the oil capacity for each APU?

Answer 15

4 quarts

Question 16

Ensure QSAS accumulators read what PSI when fully pressurized?

Answer 16

3000 +- 350

Question 17

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

Answer 17

By momentarily placing the generator switch to “test”

Question 18

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

Answer 18

Only from the APU cabinet

Question 19

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

Answer 19

60%

Question 20

Tachometer should reach 100% within how long?

Answer 20

11 seconds

Question 21

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

Answer 21

1 minute

Question 22

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

Answer 22

900

Question 23

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

Answer 23

2000 pounds. Main tank #2

Question 24

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

Answer 24

Emergency

Question 25

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

Answer 25

Crew entry door. APU cabinet. Pilots knee

Question 26

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

Answer 26

1300 F

Question 27

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

Answer 27

200 +- 10 volts. 400 +- 5 cycles

Question 28

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

Answer 28

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

Question 29

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

Answer 29

Perform deicing procedure using an H-1 heater

Question 30

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

Answer 30

Manual

Question 31

Ensure air conditioning master switch is in what position?

Answer 31

Ram air

Question 32

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

Answer 32

To ensure O-ring is not dropped

Question 33

How do you downgrade from the normal mode?

Answer 33

Momentarily move switch to gen only position

Question 34

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

Answer 34

Shear pins may shear

Question 35

Which hydraulic system pressurizes the APU?

Answer 35

Right

Question 36

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

Answer 36

``` 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) ```

Question 37

How many fire extinguishers does the APU have?

Answer 37

2

Question 38

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

Answer 38

P-14 Circuit breaker panel in the bathroom

Question 39

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

Answer 39

Check the AFTO 781 Forms

Question 40

Ensure start switches are off to prevent what?

Answer 40

Inadvertant motoring

Question 41

Starting an APU with frozen doors can do what?

Answer 41

Shear door pins

Question 42

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

Answer 42

Load bank switch

Question 43

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

Answer 43

The external power door

Question 44

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

Answer 44

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

Question 45

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

Answer 45

800 F

Question 46

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

Answer 46

5-35 minutes unless a real world EWO situation occurs