Boeing 737 Max - APU - SmartCockpit - Airline training guides, Aviation, Operations, Safety

The APU can supply both transfer busses:

On ground only.

On the ground or in the air.

In the air only.

Never.

Correct! Wrong!

The APU start cycle may take up to:

180 seconds.

120 seconds.

60 seconds.

90 seconds.

Correct! Wrong!

Automatic shutdown occurs in the event of EGT exceedance.

Illumination of the APU DOOR light indicates:

The APU door is not in the commanded position.

The APU door is not in the commanded position and must be shut down.

The APU door is not in the commanded position causing an automatic shutdown.

Correct! Wrong!

The APU may be used as a pneumatic source up to:

17 000 feet.

10 000 feet.

25 000 feet.

35 000 feet.

Correct! Wrong!

APU operation requires the following:

APU fire switch on the overheat/fire panel must be IN

Battery switch must be ON.

All statements are correct.

APU fire control handle on the APU ground control panel must be IN

Correct! Wrong!

If the APU GEN OFF BUS light fails to illuminate by the end of the start cycle:

The FAULT light illuminates.

The MAINT light illuminates.

The APU failed a self test and the OVERSPEED light will illuminate.

There is no light associated wih this malfunction.

Correct! Wrong!

When the APU is started using battery power only, there is a normal indication on the electrical metering panel that the APU generator has come on line and is ready to be selected.

False.

True.

Correct! Wrong!

When the APU is started using battery power only, there is a NO indication on the electrical metering panel that the APU generator has come on line and is ready to be selected. Both the frequency and voltage readings are zero until the APU generator is placed on line.

The APU is capable of supplying bleed air for both air conditioning packs:

On the ground only

In the air only.

Never.

On the ground or in the air.

Correct! Wrong!

During APU operation, fuel is automatically heated to prevent icing:

False.

True.

Correct! Wrong!

Of the four lights located on the APU control panel, which light will NOT cause an automatic shutdown of the APU when it illuminates?

LOW OIL PRESSURE

DOOR

FAULT

OVERSPEED

Correct! Wrong!

Electrical power to start the APU comes from:

Battery power or either AC transfer bus

The battery bus or the DC ground power receptacle

The No.1 Transfer bus if available. If AC power is not available, battery power is used

Either the AC or DC standby bus

Correct! Wrong!

With AC power available, the starter generator uses AC power to start the APU. With no AC power, the starter generator uses battery power to start the APU.

The APU starts, operates and can supply electrical power alone up to:

25,000 feet.

41,000 feet.

17,000 feet.

37,000 feet.

Correct! Wrong!

THe APU will shutdown on the ground if:

The fuel LOW PRESSURE lights in the main tank illuminate

The LOW OIL QUANTITY / MAINT light illuminates

All statements are correct

The battery switch is placed to OFF

Correct! Wrong!

The APU OVERSPEED light illuminates when:

The overspeed shutdown protection feature has failed a self-test during a normal APU shutdown

APU RPM limit has been exceeded resulting in an automatic shutdown

All statements are correct.

Correct! Wrong!

If light is illuminated when APU switch is placed to OFF, light extinguishes after 5 minutes (light is disarmed when the APU switch is in OFF position).

The APU switch OFF position has an automatic shutdown delay of:

90 seconds.

120 seconds.

60 seconds.

30 seconds.

Correct! Wrong!

APU cooling air:

Enters through a cooling air inlet above the APU exhaust outlet

Enters through the ram air system

Is supplied by the air conditioning packs.

Enters through the air inlet door

Correct! Wrong!

The APU Electronics Control Unit (ECU) provides:

Automatic shutdown protection for overspeed conditions, low oil pressure and high oil temperature

Automatic control of APU speed through the electronic fuel unit

Automatic shutdown protection for APU fire, fuel control unit failure and EGT exceedance

All statements are correct.

Correct! Wrong!

Pulling up the APU fire warning switch:

Trips the generator control relay and breaker, arms the associated extinguisher and closes the bleed air valve, closes the fuel shutoff valve, and the APU inlet door.

Discharges the APU fire extinguisher and shuts down the APU.

Discharges the APU fire extinguisher.

Discharges the APU fire extinguisher and closes the bleed air valve.

Correct! Wrong!

The APU may be used as an electrical and pneumatic source simultaneously up to:

10 000 feet

17 000 feet

25 000 feet

30 000 feet

Correct! Wrong!

The APU air inlet door:

Is electronically controlled to move anywhere between fully closed (0 deg) and fully open (45deg) depending upon aircraft configuration.

has two positions: Closed and Ground position (45deg).

has three positions: Closed, Ground position (45deg) and Flight position (17deg).

Correct! Wrong!

Moving the battery switch to OFF automatically shuts down the APU.

Never

In the air only

On the ground or in the air

On ground only

Correct! Wrong!

! Because of power loss to the Electronic Control Unit (ECU)

It is recommennded to operate the APU for _____ before using it as a bleed air source.

1 full minute

45 seconds

20 seconds

30 seconds

Correct! Wrong!

This one minute stabilization is recommended to extend the service life of the APU.

If the APU is the only source of electrical power:

In flight, the galley busses are automatically shed.

On the ground, the main busses are shed first if an overload condition is sensed.

In flight, the APU attempts to carry the full electrical load.

On the ground, the galley busses are automatically shed.

Correct! Wrong!

In flight, if the APU is the only source of electrical power, all galley busses are automatically shed. If electrical load still exceeds design limits, both main busses automatically shed until the load is within design limits. On the ground, the APU attempts to carry a full electrical load. If an overload condition is sensed, the APU sheds galley busses first, and then both main busses until the load is within limits.

False.

True.

Correct! Wrong!

The APU OIL QTY maintenance status message means:

The oil quantity is low but there is sufficient oil for 30 hours of operation at the maximum oil consumption rate before a low oil pressure shutdown occurs.

The APU oil must be replenished before flight.

The oil quantity is low but there is sufficient oil for 30 to 50 hours of operation at the maximum oil consumption rate before a low oil pressure shutdown occurs.

Correct! Wrong!

When the APU is started using battery power only, there is no indication on the electrical metering panel that the APU generator has come on line and is ready to be selected. Both the frequency and voltage readings are zero until the APU generator is placed on line.

True.

False.

Correct! Wrong!

Boeing 737 Max - APU

Boeing 737 Max – APU

The APU can supply both transfer busses:

The APU start cycle may take up to:

Illumination of the APU DOOR light indicates:

The APU may be used as a pneumatic source up to:

APU operation requires the following:

If the APU GEN OFF BUS light fails to illuminate by the end of the start cycle:

When the APU is started using battery power only, there is a normal indication on the electrical metering panel that the APU generator has come on line and is ready to be selected.

The APU is capable of supplying bleed air for both air conditioning packs:

During APU operation, fuel is automatically heated to prevent icing:

Of the four lights located on the APU control panel, which light will NOT cause an automatic shutdown of the APU when it illuminates?

Electrical power to start the APU comes from:

The APU starts, operates and can supply electrical power alone up to:

THe APU will shutdown on the ground if:

The APU OVERSPEED light illuminates when:

The APU switch OFF position has an automatic shutdown delay of:

APU cooling air:

The APU Electronics Control Unit (ECU) provides:

Pulling up the APU fire warning switch:

The APU may be used as an electrical and pneumatic source simultaneously up to:

The APU air inlet door:

Moving the battery switch to OFF automatically shuts down the APU.

It is recommennded to operate the APU for _____ before using it as a bleed air source.

If the APU is the only source of electrical power:

The APU OIL QTY maintenance status message means:

When the APU is started using battery power only, there is no indication on the electrical metering panel that the APU generator has come on line and is ready to be selected. Both the frequency and voltage readings are zero until the APU generator is placed on line.