*
The airplane is on the ground with a cargo door open
*
The cargo heat selector is set to off
*
The aft cargo fire system is armed
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AIR CONDITIONING -AFT AND BULK CARGO COMPARTMENT HEATING -FUNCTIONAL DESCRIPTION
*
The two lavatory/galley ventilation fans are failed off
*
TAT is more than the selected temperature
*
The cargo temperature sensor is failed
*
Limitations on the use of bleed air.
If the cargo compartment temperature is more than 90F (32C) and the SOV and the TCV are not closed, the system latches the two valves closed. To reset the latch, do a ground test on the MAT.
Limitations on the Use of Bleed Air
The cargo heat valves are commanded closed for certain airplane conditions to minimize the use of bleed air. These are the conditions:
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Engine start
*
Takeoff
*
Autoslat extension
*
Only one engine is running and one or more wing anti-ice valve is open.
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AIR CONDITIONING -AFT AND BULK CARGO COMPARTMENT HEATING -FUNCTIONAL DESCRIPTION
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777 AIRCRAFT MAINTENANCE MANUAL
THIS PAGE IS INTENTIONALLY LEFT BLANK
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AIR CONDITIONING -SUPPLEMENTAL HEATING -INTRODUCTION
General
In locations where the heat from trim air is not sufficient, supplemental heaters add more heat. Heaters supply heat to these areas.
*
Flight crew feet (rubber pedal area)
*
Flight crew shoulders (number 2 window area)
*
Passenger doors (floor area)
*
Some galleys (floor area).
These galley complexes that have supplemental heaters:
*
Forward
*
Aft.
The environmental control system miscellaneous cards (ECSMCs) supply control logic for all supplemental heaters. The cards enable heater operation based on airplane conditions. ELMS gives power for heater operation. Some heaters have manual controls that you adjust the temperature they supply.
These heaters for the flight compartment area have manual control:
*
Foot heaters
*
Shoulder heaters.
The galley complexes that has a supplemental heater have a manual control. The door heaters have no manual control.
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AIR CONDITIONING -SUPPLEMENTAL HEATING -INTRODUCTION
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AIR CONDITIONING -SUPPLEMENTAL HEATING -FLIGHT DECK FOOT HEATERS
Purpose
Flight deck foot heaters add heat to the foot areas of the flight crew.
Physical Description
These are electrical heaters.
Location
One set of foot heaters is on the floor under each set of rudder pedals.
The captain foot heater selector is on the P13 sidewall panel -captain. The first officer foot heater selector is on the P14 sidewall panel -first officer.
Operation
The foot heater selectors permit selection of a high or low heat.
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AIR CONDITIONING -SUPPLEMENTAL HEATING -FLIGHT DECK FOOT HEATERS
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AIR CONDITIONING -SUPPLEMENTAL HEATING -FLIGHT DECK SHOULDER HEATERS
Purpose
Flight deck shoulder heaters add heat to the air supplied to the shoulder areas of the flight crew.
Physical Description
These are electrical heaters.
Location
One heater is on each side of the nose wheel well in the main equipment center.
The captain shoulder heater control is on the P13 sidewall panel -captain. The first officer shoulder heater control is on the P14 sidewall panel -first officer.
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