2. Air Systems Flashcards
Recall AIR SD symbology and color-coding:
Flight Deck/Cabin Supply Duct Temperature
White - Normal
Amber - Temperature exceeds limit
Recall AIR SD symbology and color-coding:
Flight Deck/Cabin Actual Temperature
White - Normal
Recall AIR SD symbology and color-coding:
Flight Deck/Cabin Selected Temperature
Cyan - Normal
Recall AIR SD symbology and color-coding:
Flight Deck/Cabin Temp Dial
Blank - Auto
White - Manual
Recall AIR SD symbology and color-coding:
Air Conditioning Pack
White – Commanded OFF, no air flow
Green – Commanded ON, normal air flow
Amber – Commanded OFF, normal air flow
Amber (vaned) - Commanded ON with no air flow
Recall AIR SD symbology and color-coding:
Cabin Altitude
White - Normal
Red - Above 10,000 feet
Recall AIR SD symbology and color-coding:
Differential Pressure
White - Normal
Amber - Above normal limit
Recall AIR SD symbology and color-coding:
Cabin Rate of Climb/Descent
White - Within normal limits
Amber - Exceeds normal limits
Recall AIR SD symbology and color-coding:
Landing Altitude
White – Normal (Manually input)
Magenta – Normal (FMS generated)
Dashes – Invalid data
Recall AIR SD symbology and color-coding:
OUTFLOW Valve Position
White - Normal
Blank - No data
Recall AIR SD symbology and color-coding:
Outflow Valve CLSD
Amber - Fully closed
White - Not fully closed
Recall AIR SD symbology and color-coding:
Bleed Air Valve
White - Commanded off (horizontal lines), or, commanded on (vertical lines)
Green - Commanded on with engine running
Recall AIR SD symbology and color-coding:
APU
Blanked - APU air not available
White - APU air available but not selected
Green - APU air available and selected
Recall AIR SD symbology and color-coding:
Bleed Air Temperature
White - Normal (°C).
Amber - Exceeds upper limit or temperature low with wing/tail anti-ice selected on
Recall AIR SD symbology and color-coding:
Manifold Pressure
White - Normal
Amber - Exceeds high and low limits
Recall AIR SD symbology and color-coding:
Isolation Valve
White - Commanded closed
Green - Commanded open
Amber - Valve position disagrees with commanded position
Recall the function of the AVIONICS COOLING Switch
The AVIONICS COOLING Switch is operative inflight only and is used to control radio rack cooling:
FAN - the primary fan cools the radios; if the primary fails, the backup fan comes on automatically
OVRD - the radio rack fans are off, the venturi valve is commanded open and venturi airflow cools the radios
**Note: on the ground, both fans stay on all the time and the venturi valve is commanded closed
Recall the function of the RAM AIR Switch
OFF - Ram air valve commanded closed
ON - Ram air valve commanded open, allowing ram air to enter the air conditioning ducts
The system provides ventilation for the cabin and the cockpit when air conditioning is not available
**Note: aircraft packs are not required to be running for ram air ventilation
Recall the function of the PACK SHUTDOWN Switch
**Note: Both AC packs will automatically shut down if either engine fails during takeoff OR if selected OFF through the FMS. An affected pack will also shut down if a high supply duct temperature is sensed.
AUTO - Allows automatic pack shutdown in the event of an engine failure
OVRD – Overrides the auto pack shutdown for an engine failure OR when the packs are selected OFF on the FMC
Note: The auto pack shutdown feature is disarmed above 3000’ AGL
Note: Auto pack shutdown for hi supply duct temp cannot be overridden
Recall the function of the FLOW Switch
NORM – The flow control valve solenoid is energized to provide a lower airflow rate
HIGH - The flow control valve solenoid is de-energized to provide a higher airflow rate
**Note: The FLOW Switch must be in NORM for takeoff
Recall the function of the ISOL Switch
CLSD- The isolation valve is commanded closed, isolating the left and right pneumatic systems
OPEN- The isolation valve is commanded open - allows crossfeed of left and right pneumatic systems
AUTO- The isolation valve is controlled by the pneumatic system controller. Allows automatic crossfeed of left and right pneumatic systems during one bleed source operation with airfoil ice protection selected ON
Recall where CABIN ALTITUDE and CABIN RATE are displayed
Cabin pressurization information is displayed on the AIR SD synoptic
Cabin Altitude and Cabin Rate information is also displayed on the SECONDARY ENGINE SD synoptic
Recall the function of the Instrument Panel Flow Indicator
Note: During ground operations, with both air conditioning packs selected ON, the instrument panel cooling fan is not running – and instrument cooling is provided by the aircraft air conditioning system
Note: Airflow indications apply only during ground operations, and inflight with both air conditioning packs shut down
ON – On the ground, with one or both packs off, indicates instrument panel cooling fan airflow
OFF – On the ground, with one or both packs off, indicates the absence of airflow and cooling fan failure
**Note: During ground operations, if the APU is required for cooling and both pilots must leave the cockpit, one AC pack should be selected OFF. This will preclude possible Display Unit overheats caused by an inadvertent APU shutdown with both packs selected on
**Note: During flight operations, BOTH AC packs must be OFF for Display Unit cooling fans to operate
Recall the function of the Gasper Booster Fan switch
ON (Push) – Provides supplemental airplane ventilation with or without air conditioning packs operating
OFF – booster fan is not on; switch is extinguished
**Note: With packs off during booster fan operation, the ram air valve should be manually selected ON (the valve does not open automatically)
Recall the function of the CABIN PRESS control panel
MANUAL - When switchlight is pushed, MANUAL illuminates and the cabin pressurization system operates in manual mode
SELECT - Illuminates to indicate failure of both automatic cabin pressure controllers
Note: Switchlight is dark when the pressurization system is operating in automatic mode
MANUAL LDG ALT Switch – used to set landing altitude when FMS data is not available
MANUAL (Climb/Desc)Switch – manually repositions the outflow valve to increase/decrease cabin pressurization
Recall the Takeoff with Air Conditioning Packs Off procedure
Takeoff with Air Conditioning Packs Off
TO/APPR key…………………………Push
PACKS – Line select ON to OFF
Observe PACKS ALL OFF alert message on EAD
**NOTE: Air conditioning packs will shut off at throttle advance and will come back on at 3,000 feet AGL
Recall how forward and aft cargo bins are heated and where live animals must be transported
The forward cargo compartment is electrically heated to a temperature range between 60° and 75°F
Live animals must be transported only in the forward cargo compartment, forward of the cargo door (Bin 1)
The aft cargo compartment is heated with cabin exhaust air
Recall the function of the Pneumatic Overheat Detection System (PODS)
PODS is automatically tested when the engine fire test is performed
If a failure is detected in the anti-ice manifolds, PODS automatically closes the respective anti-ice valve and alerts the flight crew
Detects overheat conditions in the tail compartment AND along the wing and tail ice protection manifolds
