APU Pneumatic Ice and Rain Flashcards
An APU delivers what kind of power, Directly to an aircraft?
Electrical
How are most transport category aircraft main engines started?
Pneumatically
Air Removed from an engine’s high pressure compressor section passes through a
Bleed Valve
The engine cowling anti-ice on the B737-700 is provided by
engine bleed air
which system on a b737 does not rely on pneumatic air to function?
Pitot and Probe anti-icing
how many sources of high-pressure air for the pneumatic system are available on the B737-700
Three
How does the APU receive its Fuel?
It is siphoned from main tank#1
With the Pneumatic isolation valve closed, the APU can supply pressurized air to
the #1 pneumatic duct.
What system is pressurized from pneumatic duct #1 that has no equivalent in pneumatic duct #2?
Potable water tank
If the APU is operated in flight to provide only pneumatic pressure, what is the maximum operating Altitude?
17,000 MSL
After operating the APU, how long must you wait before removing battery or standby power from the aircraft?
at least one minute to allow the power-off self-test to complete.
What is the purpose of a check valve?
Prevents backflow (or reversible flow) in a fluid System.
Is the B737-700 certified for flight into known icing conditions?
Only into known or forecast light or moderate.
What does a BLUE indicator on the forward overhead electrical control panel signify?
The Availability of the indicated source.
The wing thermal anti-ice system protects
leading edge slats, except the most outboard section.
