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13 Cards in this Set
- Front
- Back
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Explain the Equipment Cooling in the ground configuration.
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On the ground, or with cabin differential pressure less than 1 psi, the exhaust fan air is routed through a flow control valve.
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What power source runs the main outflow valve?
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Both AC and DC motors
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What is maximum differential pressure?
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8.65 psi
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Explain the 4 modes of pressurisation on the Classic and which power source is used?
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AUTO - automatic, normal mode, Uses AC motor.
STBY - semi-automatic, system reverts after AUTO fail. Uses DC motor MAN AC - manual control uses AC motor MAN DC - manual control uses DC motor |
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How many outflow valves are fitted?
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Two, FWD and AFT (Main Outflow Valve)
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From where is altitude and barometric information supplied for pressurisation?
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Automatic mode, aircraft altitude is sensed from static ports, In stby mode, aircraft altitude is supplied by ADCs.
Barometric corrections are supplied by CAPT (auto) and FO (stby) altimeters. |
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Explain the airflow from cabin to outflow valve.
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Air flows from the cabin via foot level grills, around the aft cargo compartment (for heating) and out via the main out flow valve.
Inflight cabin air is taken from the cabin thru instruments and E & E bay, via closed flow control valve and around fwd cargo compartment (for heating). The forward out flow valve is the discharge point for air circulated around the fwd cargo compartment. The fwd outflow valve is closed whenever the right recirc fan is operating. (to refresh or removal cabin air switch right PACK to HIGH, causing the recirc fan to switch OFF and the fwd outflow valve to open) On the ground or inlfight with diff psi of < 2.5 psi, the flow control valve is open and air is dumped overboard before the fwd cargo compartment. |
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What does the FLT/GRD switch do?
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FLT - pressurises the cabin to 0.1 psi
GRD - forces the outflow valve open to depressurise the cabin |
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When is cruise relay tripped? What are the constant cabin altitude schedules?
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Cruise relay is tripped approx 1000' below flight altitude. The controller schedules a constant cabin altitude: (diff flight/cabin alt)
- 7.45 psi to 28 000' - 7.8 psi > 28 000' |
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When does the pressurisation DES mode activate?
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Approx 1000' below FLT ALT
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What are the 3 conditions which cause the AUTO FAIL light?
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AUTO FAIL light indicates:
- loss of AUTO AC power - excessive rate of cabin psi change (> 1800 fpm) - high cabin alt (> 13 875') |
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How does STBY mode work with reference to FLT/GRD switch, FLT ALT, Cabin ALT and cruise/des modes?
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STBY mode is run off DC motor which requires crew to set the pressurisation.
GRD position still opens outflow valve, depressurising the aircraft. FLT position will drive the outflow valve to attempt to pressurise the cabin to the selected CAB ALT (set 200' below elevation for takeoff) In flt, cabin alt must be set off the placard. In DES, CAB ALT is set to 200' below the landing elevation. |
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What can the TRIP RESET switch reset?
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BLEED TRIP OFF
ZONE TEMP |
