Term
| What is 10th stage air used for? 14th stage? |
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Definition
10th - starting, air conditioning, pressurization
14th - anti-ice, thrust reversers |
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Term
| Which valves are spring loaded to the open position? |
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Definition
14th stage SOVs
Cowl AI valves (with bleed air) |
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Term
| When is the 10th stage isolation valve automatically operated? |
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Definition
Starter engagement - open
Pack overpressure - closed |
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Term
| How are the 10th stage bleed air valves powered? |
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Definition
L - DC ESS
R -DC BUS 2 (just like the pack) |
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Term
| When do the 10th stage bleed air valves operate automatically? |
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Definition
Starter engagement - open
Pack overpressure, Eng Fire Push light - closed |
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Term
| How is the 10th stage isolation valve powered? |
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Definition
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Term
| How does the APU LCV control APU load? |
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Definition
| Modulates to maintain APU EGT within range - electric first, pneumatic second |
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Term
| Explain APU LCV interlock protection? |
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Definition
| Second level of protection (1st check valve) auto closes or prevents opening of APU LCV when: L 10th stage valve is opened, R 10th stage and isolation valves are opened |
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Term
| How are the 14th stage L/R SOVs powered? |
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Definition
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Term
| When are the 14th stage SOVs automatically closed? |
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Definition
| Eng Fire Push (will reopen when N2 spools down) |
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Term
| Describe the bleed air leak detection system for: 10th stage manifold, 14th stage, Wing and fuselage? |
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Definition
10th - dual loop sensing system
14th - single loop
Fuselage - single loop
Wing - thermal sensors |
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Term
| Can the bleed air leak detection system detect a short? |
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Definition
| No, considers it an actual overheat condition |
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Term
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Definition
| APU LCV is stuck open when commanded closed by inerlock protection |
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Term
| Where does the bleed air leak detection system minitor the pneumatic ducting? |
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Definition
| Downstream of the engine bleed SOVs |
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Term
| In the event of an electrical failure, in what position do the 10th and 14th stage valves fail? |
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Definition
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Term
| Where does the APU LCV supply air to? |
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Definition
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Term
| With the 10th stage isolation valve closed, where can the L and R manifolds receive bleed air from? |
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Definition
Left - Left engine bleed air, APU, external air
Right - Right engine bleed air only |
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Term
| Explain what is being tested during the DUCT MON and LOOP A and B tests. |
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Definition
DUCT MON - simulates an overheat condition; tests 10th, 14th and anti-icing elements
LOOP A and B - tests for a short condition in 10th stage loops |
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Term
| What is the difference in location of a Jet Pipe Overheat and a Bleed Air Leak warning? |
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Definition
Jetpipe Overheat: upstream of the 10th and 14th stage manifold valves
Bleed Air Leak: downstream of the 10th and 14th stage manifold valves |
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