B737Cl Apu Qrh 7

Front 1

The APU may be operated with APU bleed only up to a maximum altitude of

Back 1

17,000ft

Front 2

Maximum continuous EGT for Garrett APU operation is?

Back 2

710 degrees C

Front 3

The APU LOW OIL PRESSURE light is

Back 3

Disarmed when the APU switch is in the OFF position.

Front 4

The APU will automatically shut-down

Back 4

When the battery switch is placed OFF on the ground only.

Front 5

The overspeed light will illuminate when a start is aborted prior to the APU reaching normal operating speed and

Back 5

Will extinguish when the APU switch is placed to START again.

Front 6

Should the APU switch fail to shut-off the APU

Back 6

Pull up the APU Fire Warning Switch.

Front 7

If the APU runs down due to fuel starvation, the Master Caution annunciation system will show

Back 7

APU and services being operated by the APU.

Front 8

The APU fire warning system gives aural and visual warnings

Back 8

In the flight deck and main wheel well.

Front 9

During a normal APU start

Back 9

The amber LOW OIL PRESSURE light is lluminated until the APU oil pressure is normal (approx. 35% RPM).

Front 10

The APU fuel heater

Back 10

Is automatically operated and uses the APU compressor bleed air.

Front 11

If an APU fire warning is sensed

Back 11

The APU will shut-down automatically.

Front 12

The Garrett and Sundstrand APU generators are rated at:

Back 12

45 KVA's in-flight and 55KVA's on the ground.

Front 13

How is the APU switched onto the AC electrical system?

Back 13

By two APU switches individually operated.

Front 14

Which of the following statements is correct? (737 - 1-500)

Back 14

The APU can power Generator Bus 1 with ground power connected to Generator Bus 2.

Front 15

Maximum start EGT for Garrett APU operation is?

Back 15

760 degrees C

Front 16

The maximum aircraft altitude for both APU bleed and electrical load is?

Back 16

10,000ft

Front 17

The maximum aircraft altitude for APU electrical load is?

Back 17

35,000ft Garrett; 37,000ft Sundstrand; 41,000 Allied Signal.

Front 18

When does the APU fuel solenoid valve open?

Back 18

When oil pressure has reached 4psi.

Front 19

The APU Electrical Generator and APU Oil Cooler are cooled by

Back 19

A gear driven fan.

Front 20

With an APU aborted start on the ground, another start may be attempted
immediately

Back 20

But 5 minutes cooling is required between the second and third attempt and a wait of one hour is required after the third start attempt.

Front 21

If the APU generator is providing electrical power to the aircraft while on the ground,

Back 21

The galley electrical loads will automatically be shed if the total electrical power requirements exceed design limits.

Front 22

Illumination of the APU DET INOP light

Back 22

Activates master caution "OVHT/DET".

Front 23

APU bleed air

Back 23

Is not allowed to be used for wing anti-ice.

Front 24

The APU oil LOW QUANTITY light

Back 24

Is only armed when the APU start switch is out of OFF.

Front 25

If an APU fire warning is sensed

Back 25

The APU will shut-down automatically.

Front 26

The Garrett and Sundstrand APU generators are rated at:

Back 26

55 KVA's either in-flight or on the ground.

Front 27

How is the APU switched onto the AC electrical system?

Back 27

By two APU switches individually operated.

Front 28

Which of the following statements is correct? (737 - 1-500)

Back 28

The APU can power Generator Bus 1 with ground power connected to Generator Bus 2.

Front 29

Maximum start EGT for Garrett APU operation is?

Back 29

760 degrees C

Front 30

The APU fuel heater

Back 30

Is automatically operated and uses the APU compressor bleed air.

Front 31

The maximum aircraft altitude for APU electrical load is?

Back 31

35,000ft Garrett; 37,000ft Sundstrand; 41,000 Allied Signal.

Front 32

The overspeed light will illuminate when a start is aborted prior to the APU reaching normal operating speed and

Back 32

Will extinguish when the APU switch is placed to START again.

Front 33

The maximum aircraft altitude for both APU bleed and electrical load is?

Back 33

10,000ft

Front 34

During a normal APU start

Back 34

The amber LOW OIL PRESSURE light is lluminated until the APU oil pressure is normal (approx. 35% RPM).

Front 35

The APU fire warning system gives aural and visual warnings

Back 35

In the flight deck and main wheel well.

Front 36

The APU may be operated with APU bleed only up to a maximum altitude of

Back 36

17,000ft

Front 37

Should the APU switch fail to shut-off the APU

Back 37

Pull up the APU Fire Warning Switch.

Front 38

With an APU aborted start on the ground, another start may be attempted
immediately

Back 38

But 5 minutes cooling is required between the second and third attempt and a wait of one hour is required after the third start attempt.

Front 39

The APU will automatically shut-down

Back 39

When the battery switch is placed OFF on the ground only.

Front 40

The APU LOW OIL PRESSURE light is

Back 40

Disarmed when the APU switch is in the OFF position.

Front 41

Maximum continuous EGT for Garrett APU operation is?

Back 41

710 degrees C

Front 42

If the APU runs down due to fuel starvation, the Master Caution annunciation system will show

Back 42

APU and services being operated by the APU.

Front 43

The APU is inadvertently left powering both GEN buses. At lift off, the APU will continue to power both buses until one side is depowered.

Back 43

True.

Front 44

Can the APU get fuel without any AC power?

Back 44

Yes via suction feeding.

Front 45

During a normal APU start, the APU Low Oil Press light should be out.

Back 45

False.

Front 46

Which of the following is a desirable APU start sequence?

Back 46

Batt switch ON; Aft #1 fuel pump ON; Fire check DONE; APU bleed OFF.

Front 47

Which of the following will cause the APU overspeed light to illuminate?

Back 47

Turbine overspeed.
Aborted start.
Self-test failure detected.

Front 48

Prior to starting the APU, you notice that the APU over speed light is ON. Which of the following is FALSE?

Back 48

Do not attempt to start the APU.

Front 49

When does the APU fuel solenoid valve open?

Back 49

When oil pressure has reached 4psi.

Front 50

Can you power both GEN buses with the APU while in flight?

Back 50

Yes if the APU is inadvertently left powering both GEN buses prior to lift off.

Front 51

The APU Electrical Generator and APU Oil Cooler are cooled by

Back 51

A gear driven fan.

Front 52

What are the APU start limits?

Back 52

3 starts with 1 minute rest in between; 5 minute rest after 3rd try.

Front 53

The APU is running. Which of the following will cause an automatic shutdown of the APU?

Back 53

Low oil pressure, fault, or overspeed.
Fire warning.
APU exceeds preset EGT limits.

Front 54

Will the APU shut down if you turn off the Battery switch (Aircraft on the ground)?

Back 54

Yes

Front 55

The reason the APU shuts down when the battery switch is turned off (on the ground) is because you lose fire protection capability.

Back 55

False. You loose detection.

Front 56

What happens when you get an APU fire warning?

Back 56

APU fuel valve closes; APU bleed valve closes; APU inlet door closes; APU fire bottle is armed; Field Relay is opened.

Front 57

The APU oil LOW QUANTITY light

Back 57

Is only armed when the APU start switch is out of OFF.

Front 58

APU bleed air

Back 58

Is not allowed to be used for wing anti-ice.

Front 59

Illumination of the APU DET INOP light

Back 59

Activates master caution "OVHT/DET".

Front 60

If the APU generator is providing electrical power to the aircraft while on the ground,

Back 60

The galley electrical loads will automatically be shed if the total electrical power requirements exceed design limits.

Front 61

Prior to starting the APU, the OVERSPEED light is ON. You start the APU. What caused the OVERSPEED light to illuminate?

Back 61

If you shut down the APU after it reaches full speed and the OVERSPEED light comes on again, then you had a legitimate APU fault.
If you shut down the APU after it reaches full speed and the light stays off, you had an aborted start.