Bleed Air Flashcards
The APU supplies bleed air to which pneumatic duct?
Left
A high pressure ground source supplies bleed air to which pneumatic duct?
Right
What is bleed air used for on the 737-700 NG?
Engine starting, Engine anti-ice, wing anti-ice, Air conditioning, Pressurization, Water tank pressurization, Hydraulic reservoir pressurization
Which stage in the engine compressor section is the primary source of engine bleed air?
5th stage (low pressure stage)
The 9th stage (high pressure stage) valve is normally in what position during aircraft operations?
Closed. Only opens when 5th stage bleed air is insufficient for operations.
T/F: The engine bleed air valve also acts as a Pressure Regulating Shutoff Valve (PRSOV) ?
True
T/F: With the ISOLATION VALVE switch in AUTO, placing any one of the PACK switches or Engine BLEED Air switches to the OFF position causes the isolation valve to open automatically?
True
APU bleed air is available up to what altitude?
17,000 feet
The APU can provide air for ____ packs on the ground and ____ packs in flight?
2, 1
The APU should be operated for how many minutes before using it for bleed air?
2 minutes
After engine start, do NOT operate the engines above ___________ with the DUAL BLEED light illuminated.
idle thrust
Ground external air is primarily used for what purpose?
Engine starting when the APU is not available
T/F: The WING-BODY OVERHEAT light can be reset by pressing the TRIP RESET switch on the Bleed Air Panel?
False. The respective pneumatic duct has to cool before the annunciator light extinguishes.
What does the isolation valve do in the Bleed Air system?
Connects the left and right bleed air ducts
T/F: Bleed air pressure and temperature control is fully automatic
True
The engine bleed air valve is ________ controlled (by the Engine BLEED Air switch) and is ____________ operated
electrically (DC power); pneumatically
When does the BLEED TRIP OFF light illuminate?
When the engine bleed air temperature and/or pressure exceeds a predetermined limit (causes the bleed air valve to automatically close). Requires resetting
T/F: It is normal for the DUAL BLEED light to be illuminated after selecting the APU BLEED Air switch to ON.
True
The WING BODY OVERHEAT light indicates a ______________
bleed air leak
T/F: Bleed air pressure and temperature control is fully automatic.
True
______________ are installed to monitor bleed air system temperature and pressure.
Bleed trip sensors
The engine bleed air valves are _________ controlled and ___________ operated once sufficient pressure is available.
electrically, pneumatically
With ISOLATION VALVE in AUTO, under what circumstances will the valve close automatically?
Both engine BLEED Air switches ON and both air conditioning PACK switches in AUTO or HIGH
With the ISOLATION VALVE switch in AUTO, under what circumstances will the valve open automatically?
placing any one of the PACK switches or Engine BLEED Air switches to the OFF position
