SV: Air Systems / Pneumatics / Air Conditioning / Pressurization Flashcards
On the Cabin Pressurization Panel, what has occurred 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. What does the controller program the cabin to?
to land at the takeoff field elevation without further pilot inputs
Which stages of the compressor section is bleed air is obtained from (NG aircraft)?
5th; 9th
The ___ high-stage valve modulates open to maintain proper pressure when 5th low-stage pressure is insufficient (NG aircraft).
9th
The engine bleed air valve is normally _____ operated and DC power activated.
pneumatically
What does the illumination of the BLEED TRIP OFF light indicate?
engine bleed air temperature or pressure exceeds a predetermined limit
When the BLEED TRIP OFF light illuminates, what effect does this have on the engine bleed air system?
The respective engine bleed air valve closes automatically
The isolation valve is _____ when the isolation valve switch in AUTO, both engine bleed air switches ON, and both air conditioning pack switches AUTO or HIGH.
closed
The isolation valve is _____ when the isolation valve switch in AUTO, if either an engine bleed air switch or an air conditioning pack switch is positioned OFF.
open
T/F: Turning the APU bleed air switch OFF with the PACK switches in AUTO will cause the isolation valve to open.
False
The APU bleed air valve is___ operated and ______ activated.
pneumatically; DC
Engine thrust must be _______ with the DUAL BLEED light illuminated.
limited to idle
______causes a WING-BODY OVERHEAT condition.
a bleed air duct leak
Which WING-BODY OVERHEAT light will illuminate if a leak in the bleed duct from the APU occurs?
Left
The isolation valve _________ if either engine BLEED air or air condition PACK switch is positioned OFF with the ISOLOATION VALVE switch in AUTO.
automatically opens
Conditioned air from which PACK, 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 within the _______.
mix manifold
On the ground, the APU can supply air for ________ for all operations.
two packs
With the air conditioning PACK switches in AUTO and both packs are operating _________.
the packs provide “normal air flow”
When one pack is operating, _________ with the air conditioning PACK switches in AUTO.
the operating pack provides high air flow
Anytime the pack valve closes on the B737 -700, the air mix valves are driven to the _______ position automatically.
full cold
In the automatic temperature mode on the B737 -700, the ________ are operated by the automatic temperature controller.
air mix valves
The automatic temperature controller is bypassed when the temperature selector is positioned to ________ on the B737-700
MANUAL
The ram air system is used to provide cooling for what part of the air conditioning systems?
heat exchangers
A DUCT OVERHEAT light causes the appropriate air mix valve to drive ___________ on a B737-700.
full cold
When a PACK TRIP OFF light illuminates, the pack valve ________ on the B737-700.
automatically closes and the mix valve drives full cold
In a B737-800, _______ if an amber ZONE TEMP light illuminates?
the MASTER CAUTION light will illuminate, and the trim air valve closes
The recirculation fan system __________ the engine bleed air demand and air conditioning load.
reduces
What does the TRIP RESET switch reset?
- DUCT OVERHEAT on the B737-700, or the ZONE TEMP on the B737-800
- BLEED TRIP OFF, PACK TRIP OFF
On the B737-800, what is indicated by the PACK light?
a pack trip off or failure of both primary and standby pack controls
Cabin air outflow controlled by______.
the outflow valve and the overboard exhaust valve
On the Cabin Pressurization Panel, what does an illuminated amber AUTO FAIL light indicate?
automatic pressurization system failure is detected
Manually positioning the outflow valve to OPEN will cause cabin altitude to _________.
Climb
The main outflow valve is the overboard exhaust exit for the majority of the air circulated through the passenger cabin and is actuated by one of _____ DC motors and
three
On the cabin altitude panel, the ________on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator indicates the cabin altitude in feet.
inner scale
On the cabin altitude panel, the _______ on the CABIN Altimeter (ATL) / Differential Pressure (DIFF PRESS) Indicator indicates the differential pressure between cabin and ambient in psi.
outer scale
The intermittent cabin altitude warning horn can be cut out ______.
By pushing the Altitude (ATL) HORN CUTOUT Switch
At _______ cabin altitude the intermittent cabin altitude warning will sound.
10,000 feet
Cabin rate of climb displayed ______.
on the cabin rate of climb indicator
On the Cabin Pressurization Panel, _______modes automatically pressurize the aircraft.
AUTO & ALTN
