AIR Systems Flashcards
What are the required immediate action items for a cabin altitude warning horn inflight?
- Oxygen Mask & Regulators….. ON & 100%
- Crew Communications ………. Establish
- Seatbelt Sign ………………….. ON
Bleed air is obtained from the ____ & _____ stages of the compressor section of the engine.
5th; 9th
When 5th low-stage pressure is insufficient, the ___ high-stage valve modulates open to maintain proper pressure.
9th
The engine bleed air valve is normally DC power activated and ______ operated.
pneumatically
The illumination of the BLEED TRIP OFF light indicates ________.
engine bleed air temperature or pressure exceeds a predetermined limit
What occurs when the BLEED TRIP OFF light illuminates?
The respective engine bleed air valve closes automatically
What precools engine bleed air?
A precooler, or heat exchanger
What sources of air can be used to start the engine?
APU, ground air cart, and engine bleed air
With the isolation valve switch in AUTO, both engine bleed air switches ON, and both air conditioning pack switches AUTO or HIGH, the isolation valve is _____.
closed
With the isolation valve switch in AUTO, if either an engine bleed air switch or an air conditioning pack switch is positioned OFF, the isolation valve is _____.
open
Does the APU bleed air switch affect the isolation valve position?
No
Does the APU bleed air valve, on the B737-800, automatically close when the APU is shut down?
Yes
The APU bleed air valve is___ activated and ______ operated.
DC; pneumatically
With the DUAL BLEED light illuminated, engine thrust must be _______.
limited to idle
What causes a wing-body overheat condition?
a bleed air duct leak
If a leak in the bleed duct from the APU occurs, which WING-BODY OVER HEAT light will illuminate?
Left
ith the ISOLOATION VALVE switch in AUTO, the isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF.
automatically opens
The Wing-Body Overheat (OVHT) TEST switch _____________.
() all answers are correct
() tests wing-body overheat detector circuit
() illuminates both WING-BODY OVERHEAT lights
Conditioned air for the cabin comes from _________________.
either the aircraft air conditioning system or a preconditioned ground source
Conditioned air from the ______, upstream of the mix manifold, flows directly to the flight deck.
left pack
Air from the left pack, air from the right pack, and air from the recirculation system is combined in the ________.
mix manifold
The APU can supply air for ________ on the ground for all operations
two packs
With the air conditioning PACK switches in AUTO and both packs are operating _________.
the packs provide “normal air flow”
With the air conditioning PACK switches in AUTO and one pack is operating _________.
the operating pack provides high air flow
With the air conditioning PACK switch in HIGH, _________.
the respective pack provides high air flow
On the B737 -700, Anytime the pack valve closes, the air mix valves are driven to the _______ position automatically.
full cold
On the B737 -700, In the automatic temperature mode, the ________ are operated by the automatic temperature controller.
air mix valves
On the B737-700, the automatic temperature controller is bypassed when the temperature selector is positioned to ________.
MANUAL
The ram air system is used to provide cooling for the __________ in the air conditioning systems.
heat exchangers
The RAM DOOR FULL OPEN light illuminates whenever the ram door is ___________.
fully open
On a B737-700, a DUCT OVERHEAT light causes the appropriate air mix valve to drive ___________.
full cold
On the B737-700, when a PACK TRIP OFF light illuminates, the pack valve ________.
automatically closes and the mix valve drives full cold
M AIR133 – (6.20.30.9)
In a B737-700, a PACK TRIP OFF is caused by _________.
pack temperatures exceeding limits
In a B737-800, what happens if an amber ZONE TEMP light illuminates?
the MASTER CAUTION light will illuminate, and the trim air valve closes
The recirculation fan system __________ the air conditioning load and the engine bleed air demand.
reduces
What makes the equipment cooling OFF light illuminate?
loss of air flow due to failure of an equipment cooling fan
M AIR137 – (6.20.40.3 and 6.20.40.6)
The TRIP RESET switch resets the ______________.
() all answers are correct
() BLEED TRIP OFF, PACK TRIP OFF
() DUCT OVERHEAT on the B737-700, or the ZONE TEMP on the B737-800
On the B737-800, the PACK light indicates _____________.
a pack trip off or failure of both primary and standby pack controls
The aircraft is pressurized by bleed air supplied to and distributed by _________.
the air conditioning system
What is cabin air outflow controlled by?
the outflow valve and the overboard exhaust valve
The main outflow valve is actuated by one of _____ DC motors and is the overboard exhaust exit for the majority of the air circulated through the passenger cabin.
three
On the cabin altitude panel, which scale on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator indicates the cabin altitude in feet?
Inner Scale
On the cabin altitude panel, which scale on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator indicates the differential pressure between cabin and ambient in psi?
Outer Scale
How can the intermittent cabin altitude warning horn be cut out?
By pushing the Altitude (ATL) HORN CUTOUT Switch
At what cabin altitude will the intermittent cabin altitude warning sound?
() 10,000 feet
How is the cabin rate of climb displayed?
on the cabin rate of climb indicator
On the Cabin Pressurization Panel, which modes automatically pressurize the aircraft?
AUTO & ALTN
On the Cabin Pressurization Panel, the MAN mode controls aircraft pressurization _____________.
manually by the Outflow Valve switch
On the Cabin Pressurization Panel, with the pressurization mode selector in the MAN mode, the outflow valve switch takes approximately _______ to move the outflow valve in the full range of motion
20 seconds
On the Cabin Pressurization Panel, an illuminated amber AUTO FAIL light indicates _____________.
automatic pressurization system failure is detected
On the Cabin Pressurization Panel, if both the amber AUTO FAIL light and the green ALTN light is illuminated, _________.
a single channel controller failure has occurred
The OFF SCHED DESCENT light indicates the aircraft began descent before having reached the planned cruise altitude. The controller programs the cabin ____________.
land at the takeoff field elevation without further pilot inputs
M AIR153 – (6.20.30.2)
On the B737-700, the pack valve will close if the cooling cycle overheats and is associated with a PACK TRIP OFF light.
True
