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10 Cards in this Set
- Front
- Back
What causes an automatic APU shutdown? |
1. High oil temp 2. Low oil pressure 3. Clogged oil filter |
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To start the APU, how many batteries are required? |
2, the APU battery, and aircraft battery |
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APU battery supplies power to what? |
1. Starter 2. Inlet door 3. APU control circuitry |
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Aircraft battery supplies power to what? |
1. Fire protection 2. APU fuel valve 3. DC fuel pump |
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APU start sequence: |
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 |
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APU shutdown: |
Moving the switch to off commands APU bleed air valve to close beginning a 60 second cool down cycle. |
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How many fire bottles for the APU? |
One halon fire bottle |
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APU
Run Light: |
APU is at operating speed. Can be used to supply electrical, and bleed air. |
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APU
Fault Light: |
Fault in system, ad APU has automatically shut down. |
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APU
Fuel Valve Light: |
Valve position disagrees with commanded position. |