*
The number at the left in the zone boxes A-F is the target zone temperature set by the cabin crew. The number at the right in each box is the actual zone temperature.
The flight deck trim air modulating valve position shows on the indication on the left of the display.
Normal flow of left and right trim air shows as open valve symbols and flow arrows.
Air Conditioning Maintenance Page
The top part of the air conditioning maintenance page shows these cabin temperature indications:
* MASTER TEMP -Temperature selected on the cabin temperature control on the P5 panel
*
ZONE TEMP -Actual temperature in each zone
*
TRGT TEMP -Target (selected) temperature for each zone
*
DUCT TEMP -Temperature measured in each zone distribution duct
*
TRIM VLV -Position of each trim air modulating valve in percent heat (0.00 is closed, 1.00 is open)
*
CTRL CH -Shows which CTC channel is in control. Left CTC controls zones F/D, A, C, & E. Right CTC controls zones B, D, &F
*
TRIM AIR PRESS -The difference, in psid, between cabin pressure and trim air pressure.
See the primary display system section for more information about the air synoptic display and the air conditioning maintenance page (SECTION 31-61).
EFFECTIVITY BEJ ALL 21-60-00
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AIR CONDITIONING -TEMPERATURE CONTROL -AIR SYNOPTIC DISPLAY AND AIR CONDITIONING MAINT PAGE
EFFECTIVITY BEJ ALL 21-60-00
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AIR CONDITIONING -TEMPERATURE CONTROL -GROUND TESTS
General
These are the temperature control ground tests that show when you select ATA 21 Cabin Temperature Control System:
*
Left cabin temperature controller
*
Right cabin temperature controller
*
Left trim air system
*
Right trim air system.
Left and Right Cabin Temperature Controller
These tests make sure that the related cabin temperature controller can change control between channels 1 and 2. This test also does a continuous built-in-test.
The test takes approximately 1-2 minutes.
This test shows for these ground test types:
*
Operational test
*
LRU replacement test.
Left and Right Trim Air System
This test makes sure that the related cabin temperature controller can control the trim air modulating valves of the trim air system on that side.
You must pressurize the pneumatic system for this test. During this test, the related trim air modulating valves open one at a time. The test takes approximately 2-3 minutes.
This test shows for these ground test types:
*
System test
*
Operational test
*
LRU replacement test.
EFFECTIVITY BEJ ALL 21-60-00
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AIR CONDITIONING -TEMPERATURE CONTROL -GROUND TESTS
EFFECTIVITY BEJ ALL 21-60-00
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AIR CONDITIONING -ZONE TEMP CTRL AND INDICATION -INTRODUCTION
Purpose
The zone temperature control and indication system adjusts flight deck and passenger cabin zone temperatures to set values. Mufflers in the trim air duct distribution ducts decreases noise in the trim air system.
General Description
The left and right cabin temperature controllers (CTCs) monitor and give temperature control for all zones. The left controller monitors and controls these zones:
*
Flight deck (F/D)
*
Passenger zone A
*
Passenger zone C
*
Passenger zone E.
The right controller monitors and controls these zones:
*
Passenger zone B
*
Passenger zone D
*
Passenger zone F.
The CTCs use the air conditioning packs for cooling and the trim air modulating valves to adjust the temperature in zones that need more heat. See the air conditioning chapter for more information about the pack cooling and mix manifold temperature control system (SECTION 21-52).
EFFECTIVITY
BEJ ALL
You use the flight deck temperature control on the air conditioning panel to control the flight deck temperature. AUTO lets you set the target temperature between 65F (18C) and 85F (29C). MAN selection lets you manually adjust the temperature in the flight deck.
You use the cabin temperature control on the air conditioning panel to select the (master) target temperature for all zones in the passenger cabin area. You use the cabin temperature screen on the cabin area control panels or cabin system control panel to bias the target temperature for passenger cabin areas. You can adjust the temperature 10F (6C) above or below the master target value. The bias does not let you select a temperature below 65F (18C) or above 85F (29C).
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