Term
| What is the Primary function of the APU? |
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Definition
| Drive the 30 KVA Generator. |
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Term
| What is the Secondary function of the APU? |
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Definition
| Provide 10th stage bleed air. |
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Term
| What positions does the APU door have? |
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Definition
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Term
| What can be done if the APU door actuator fails and the door is not operable? |
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Definition
| Can be wired in the open or closed position. if closed cannot use APU. If wired open airspeed limited to 300 KIAS (no limit if APU running) |
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Term
| How many feet is the APU danger area? |
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Definition
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Term
| Where does the APU receive fuel? |
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Definition
| both wing tanks from the APU/XFLOW pump. Rt wing tank if pump fails. |
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Term
| How many pounds an hour does the APU burn? |
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Definition
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Term
| How will the APU receive fuel should the XFLOW/APU pump fail? |
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Definition
| from the APU negative gravity relief valve which is supplied by the right engine fuel feed manifold. |
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Term
| When the APU PWR fuel switch light is pressed, what is occurring? |
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Definition
1. APU IN BITE
2. RPM and EGT Gauges
3. APU intake door opens
4. APU SOV OPEN
5. XFLOW/APU fuel pump starts |
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Term
| What is the minimum battery voltage to start the APU? |
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Definition
| 22v on both the APU and MAIN BATT |
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Term
| How long after the APU is stopped can it be restarted? |
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Definition
| when the APU is stopped, the ECU initiates a 60 sec BITE test. This test must be completed before the APU can be started again. Recommended 2 min |
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Term
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Definition
1. energizes starter motor
2. start light illuminates
3. 50% rpm START light extinguishes
4. 4 sec after the APU rpm reaches 95% rpm, the AVAIL light illuminates.
select out = Fuel SOV closes, AVAIL extinguishes. |
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