Pneumatics Flashcards
The Boeing 737-800 uses pneumatic air from which of the following sources?
Engine bleed air, external air, APU bleed air
Bleed air from the engines comes from what compressor stages?
5th and 9th
The ____ systems rely on pneumatic pressure for operation.
engine starting, air conditioning/pressurization, wing and engine anti-ice, hydraulic, water tank pressurization, and TAT probe
____ cause(s) the engine bleed valve to automatically close.
Either over pressure or over temperature
Illumination of the amber BLEED TRIP OFF light indicates what valve has automatically closed?
Engine bleed air valve
When the APU is shut down, the APU bleed valve ___________.
closes automatically regardless of APU bleed air switch position
The APU bleed air valve will close if ____.
the APU Bleed Air Switch is placed OFF or if the APU is shutdown
When starting engines with a ground air source, external air pressure should be ____ psi.
minimum of 30
During normal operations, if the Isolation Valve Switch is in AUTO, then the valve ____.
is closed
When the Isolation Valve Switch is in AUTO, the valve will open automatically if ____.
- a pack switch is placed OFF
- an engine bleed switch is placed OFF
A DUAL BLEED light will illuminate when ____.
- the APU bleed air valve is open and Engine 1 Bleed Switch is ON
- the APU bleed air valve is open, Engine 2 Bleed Switch is ON, and the isolation valve is open
BLEED TRIP OFF light would illuminate for ____.
excessive temperature or pressure
The right WING BODY OVERHEAT light indicates a duct leak in the ____.
right engine strut, right wing inboard leading edge, or right air conditioning bay
The left WING BODY OVERHEAT light indicates a duct leak in the left engine strut, left wing leading edge, left air conditioning bay, and ____.
APU duct and keel beam ducting
A bleed air duct leak is indicated by a ____ Light.
WING-BODY OVERHEAT
