General
The air conditioning panel has these controls for pack operation:
*
Left and right pack switches
*
Air conditioning reset switch.
Location
The air conditioning panel is on the P5 overhead panel in the flight deck.
Pack Control
The L PACK and R PACK switches are alternate-action switches. AUTO shows when you push the switch in for selection of automatic pack operation.
The OFF indication is not a function of switch position. It shows when the flow control and shutoff valves are closed.
Air Conditioning Reset Control
The AIR COND RESET switch is a momentary-action switch. This switch starts the system after a failure.
Training Information Point
The left and right main buses supply power for the OFF indications on the pack switches. If these buses have no power, the OFF indication does not show.
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AIR CONDITIONING -COOLING -OPERATION
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AIR CONDITIONING -COOLING -AIR SYNOPTIC DISPLAY AND AIR CONDITIONING MAINTENANCE PAGE
Air Synoptic Display
The top part of the air synoptic display shows information about the air conditioning system.
Green flow bars show air flow through the left and right packs. These symbols show the status of the packs:
*
Pack on -green oval
*
Pack off or pack status data invalid -white oval
*
Pack failed -amber oval with amber X.
The STBY COOLING message and an advisory message PACK MODE L (R) show when a pack is on and has any of these faults:
*
Air cycle machine (ACM) failed
*
Both condenser inlet temperature sensors failed
*
Economy cooling valve failed open.
If the pack stops, the STBY COOLING message shows.
Air Conditioning Maintenance Page
All the temperatures on the air conditioning maintenance page are in degrees C.
The air conditioning maintenance page has this information:
* MIX MANIFOLD TEMP -Temperature in the mix manifold
EFFECTIVITY
BEJ ALL
*
FLOW SCHEDULE -Right air conditioning pack flow schedule: 0,1,2,3, or 4. Usual left pack flow schedule is the same as the right
*
PACK FLOW-VOLUME -Pack flow rate in cubic meters per minute
*
PACK FLOW-MASS -Pack flow rate in kilograms per minute
*
PACK OUT TEMP -Temperature at the outlet of the packs
*
PRI HX IN TEMP -Temperature at the inlet of the primary heat exchangers
*
PRI HX OUT TEMP -Temperature at the outlet of the primary heat exchangers
*
CPRSR OUT TEMP -Temperature at the outlet of the air cycle machine compressors
*
SEC HX OUT TEMP -Temperature at outlet of the secondary heat exchangers
*
CONDENSER IN TEMP -Temperature at the inlet of the condensers
*
STG 2 TURB IN TEMP -Temperature at the inlet of turbine 2 in the air cycle machines
*
TRIM AIR PRESS -The difference, in psid, between cabin pressure and trim air pressure
*
PACK CTRL CH -Shows the channel in control for the left and right cabin temperature controllers
*
PACK IN PRESS -Pressure, in psia, at the inlet to the air conditioning packs
*
LOW LIM VLV POS -Position of the low limit valve (0.00 is closed, 1.00 is open)
*
TURB BYP VLV -Position of the turbine bypass valve in percent heat (0.00 is closed, 1.00 is open)
*
RAM AIR INLET -Position of the ram air inlet in percent heat
(0.00 is open, 1.00 is closed)
*
ECON COOL VLV -Open or closed position of the economy cooling valve
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*
LOWER FLOW CTRL VLV -Open or closed position of the
lower flow control valve
*
UPPER FLOW CTRL VLV -Open or closed position of the
upper flow control valve.
See the primary display system for more information about the air conditioning maintenance page (SECTION 31-61).
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