Sets selected barometric pressure reference for use by the controller.
– Automatic pressurization control failure. Control automatically transfers to standby.
Off schedule decent flight [Amber] illuminated
– Airplane descending before reaching the planned cruise altitude set in the flight altitude counter.
Auto – airplane pressurization is automatically controlled.
Check – tests auto filler functional auto system by allowing excessive rates of depressurization to be set into pressure controller.
Ground – Depressurizes the airplane when on the ground.
Flight – pressurizes the airplane when on the ground
Standby light [Green] illuminated
System operating in standby mode
Cabin rate selector
Decrease – decreases cabin altitude rate of change
Increase – increases cabin altitude rate of change.
Index – [Pip] cabin pressure rate approximately 300 ft./m
Cabin altimeter/differential pressure indicator
Inner scale – indicates cabin altitude in feet Outer scale – indicates differential pressure between cabin and ambient in PSI
Manual light [Green] illuminated
– Indicates pressurization system operating in manual mode.
Outflow valve indicator
Indicates position of the main cabin outflow valve. Operates in all modes
Outflow valve manual control switch
Open or closed – controls main cabin outflow valve to desired position.
Pressurization mode selector
Manual – airplane pressurization controlled manually by outflow valve switch.
Manual AC -outflow valve operates from AC power.
Manual DC -outflow valve operates from DC power.
Air conditioning packs:
Operate completely ____and normally operate in____?
If one pack becomes inoperative remaining pack is capable of maintaining acceptable cabin____and____?
Cabin altitude can be maintained below____feet when the airplane is at____feet with only one system working.
The left pack, normally provided the air from engine number____ and supplies air to the____; the right pack normally uses engine number____and supplies conditioned air to the____.
One, Cockpit, three, passenger cabin
Two packs operated from a single engine is not recommended due to excessive____?
Pack cooling fan:
At lower speeds, the ram air flow through the heat exchanger comes inadequate for cooling, so a pack cooling fan is designed into the system. This fan will operate any time the ____are____or the landing gear sensor is in the ____ ____. These electric fans are high electrical ____items.
Air cycle machine [ACM] is a___ ____device that changes hot pneumatic system air to cold air for____ ____.
Water separator and anti-ice valve:
To prevent icing in the water separator a____, ____will signal the____,____ providing warming air automatically.
Air mix valve:
The air mix valve for each pack combines cold, cool and hot air. according to the settings of the cockpit and passenger cabin temperature controls. This air enters a supply duct and is distributed to the environmental areas through, ____, ____, and____.
normally, the ____ ____supplies air to the Gasper system. If the____ ____ is off, the Gasper fan draws air from the air conditioning distribution bay.
Air flow is created by____ ____or by a____that operates____
Auto pack trip off:If the system is armed before takeoff, thrust loss on any engine during takeoff and climb with flaps down will, ____ ____ ____ ____, ____ ____both cooling fans, and illuminate the ____ ____lights.
Trip off both packs,
shut down ,
The airplane is pressurized by ____ ____supplied to and distributed by the air-conditioning system. Pressure is maintained by____governing the rate of outflow of cabin air through the main ____ ____. Electronic pressurization system maintains optimum cabin pressure during all phases of flight
Pressure relief valves:
Pressure relief else limit the differential pressure to a maximum of____psi. A negative pressure relief valve prevents external atmospheric pressure from____internal cabin pressure.
Cargo heat outflow valve:
The cargo heat outflow valve controls the flow of pressurized air around the forward cargo compartment. Closing the valve will assist in maintaining ____ ____ when the conditioned air supply is low (____ ____ ____ ____).
one pack shut down
Electronic cabin pressure controller and outflow valve:
Electronic controller receives information from the____-____ system, ____(____) and____ ____ ____ ____and monitors cabin pressure
air data, computer [ADC]
landing gear safety relay
Automatic mode:In the automatic mode of operation ____ ____, ____ and____are automatically determined by the electronic controller.This mode utilizes selected____ ____and___ ____to calculate the most desirable cabin cruise altitude which will be as near as possible to planned landing altitude without exceeding ____PSI differential pressure. When flying above 40,000 feet, 40,000 should be set in the flight altitude window; auto mode will automatically operate at maximum differential of ____psi
Pressurization (automatic mode):
The cabin rate of climb and descent are proportional to airplane vertical speed up to a maximum of ____sea level feet per minute climb and ____sea level feet per minute descent.
Pressurization [automatic mode]:
When the airplane is on the ground, the flight/ground switch determines the sub mode of operation. In ground. The controller signals outflow valve full____. With slight selected, the controller initiates a minimum pressure mode, modulating the outflow valve to produce a cabin altitude approximately ____ below field elevation
Pressurization (automatic mode):If your plane begins a descent before reaching the selected flight altitude, the controller automatically initiates and off schedule descent. The off schedule descent light will illuminate and cabin altitude will program to descend to the takeoff runway elevation minus____ feet.
The auto fail and standby light illuminated indicates the pressurization control has transferred to standby mode due to any of the following:cabin altitude above approximately____feet, ____ ____ ____ ____ ____ ____, or loss of____ ____for more than ____seconds.
Excessive cabin pressure rate of change
Pressurization [standby mode]:
Standby mode will be activated if the automatic mode fails or when the standby mode is selected. The standby system uses the ____ ____valve actuator to control cabin altitude. In-flight the rate of change of cabin altitude is independently determined by position of the Rate Selector
Pressurization [manual mode]:
Manual mode controls outflow valve switch with____or____power.
A green manual light illuminates with the selector in manual____or____power.