Boeing 767 Apu

Front 1

What causes an automatic APU shutdown?

Back 1

1. High oil temp

2. Low oil pressure

3. Clogged oil filter

Front 2

To start the APU, how many batteries are required?

Back 2

2, the APU battery, and aircraft battery

Front 3

APU battery supplies power to what?

Back 3

1. Starter

2. Inlet door

3. APU control circuitry

Front 4

Aircraft battery supplies power to what?

Back 4

1. Fire protection

2. APU fuel valve

3. DC fuel pump

Front 5

APU start sequence:

Back 5

1. APU fuel valve opens

2. Air inlet door starts to open

3. Left main fuel pump energizes

4. Starter engages after inlet door fully opens

5. APU accelerates to operating speed

Front 6

APU shutdown:

Back 6

Moving the switch to off commands APU bleed air valve to close beginning a 60 second cool down cycle.

Front 7

How many fire bottles for the APU?

Back 7

One halon fire bottle

Front 8

APU

Run Light:

Back 8

APU is at operating speed. Can be used to supply electrical, and bleed air.

Front 9

APU

Fault Light:

Back 9

Fault in system, ad APU has automatically shut down.

Front 10

APU

Fuel Valve Light:

Back 10

Valve position disagrees with commanded position.