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7 Cards in this Set
- Front
- Back
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APU PWR switch (Electric panel)
ON ---------- AVAIL |
Switch starts APU (normal ops) and powers GEN buses
ON - APU powering any bus AVAIL - Flashes until APU >95%. Steady - Power OK for transfer |
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START/STOP switch (APU panel)
ON ------- OFF |
ON - Switch pressed
- Flashes when starting, steady when ready - during APU fire, flashes until switch selected OFF OFF - Steady when APU shutdown initiated - APU bleed valve CLOSES - APU shuts down 90 seconds after - remains lit until shutdown complete |
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Pulling the APU fire handle does what?
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Emergency Shutdown
APU Fuel Valve Closes APU Gen disconnects / deenergized #2 Bleed Valve Closes Agent is armed |
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A - APU FUEL light
B - AUP DOOR light C - APU FAIL light |
A - fuel pressure low
B - Inlet door not fully open (start) or fully closed (shutdown) Door begins to close 1 minute after shutdown C - APU INOP |
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APU GEN switch
OFF |
Resets APU Gen
OFF - gen on speed, but malfunction has occurred |
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APU will Auto Shutdown for:
(9 items) |
Inlet door not open
Power failure No light-off during start High EGT or loss of signal Fire warning Reverse flow in bleed air system Overspeed or loss of N1 or N2 signal Loss of DC power Low oil pressure or high oil temp |
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APU In-flight Limits
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Start - up to 25,000 ft
Run - up to 30,000 ft (electric only) |
