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Air Conditioning Panel
Figure 021
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Air Conditioning Panel
R Figure 021A
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(4)
FADEC Demand Signal The ACSC can supply a demand signal to FADEC (Full Authority Digital Engine Control) to increase the engine idle setting during descent and ground operation. It does this to increase the available bleed pressure when the bleed pressure is insufficient to provide the necessary flow through the packs 10HM (11HM) for cabin cooling. The demand signal is 0 % for most normal operating conditions. This increases proportionally to 100 % (to give up to 30 psig pack inlet pressure), when the duct demand temperature of any zone reaches a predetermined low value (lack of cooling). The pack inlet pressure must also have reached a predetermined low value.
(5)
Duct Overheat Detection and Actions Both ACSC's can detect an overheat 88 DEG.C (190.40 DEG.F) in any one of the three zone-supply ducts. The ACSC will send a signal to make the FAULT light on the HOT-AIR switch 7HK come on. It will also close the trim-air pressure-regulating valve 14HK and the three trim-air valves 11HK (12HK, 13HK). The FAULT light will stay on and the closed valves will stay closed until:
-
the duct temperature goes down below 70 DEG.C (158.00 DEG.F),
-
the HOT-AIR switch 7HK is released (to make the FAULT light go off.),
-
the HOT-AIR switch 7HK is pressed again (to open the valves 14HK, 11HK, 12HK, and 13HK).
(6)
Trim-Air System Failure Failure of the trim-air system will cause a modification of the control mode. Separate control of cockpit and cabin is still given, but a distinction between forward and aft cabin is not made. It will be an average from the two cabin duct demands. In this mode each pack is controlled seperately, pack 1 for the cockpit and pack 2 for the cabin.
B. Failure Conditions The system has different back-up functions to make sure of safe operation in the event of failure. The second lane of any ACSC will take over full functions of the control. So there will be no impact.
(1) Duct Overheat Detection and Actions Both ACSC's 47HH (57HH) give overheat detection and related actions. Refer to A. (5) for further details.
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C. Control and Indication R (Ref. Fig. 021B)
R The temperature in each zone is controlled to between, cold 18 DEG.C
(64.40 DEG.F) and hot 30 DEG.C (86.00 DEG.F). This is relative to the selection of the temperature selector(s) (27HK, 28HK, 29HK). In the center position the temperature is controlled to about 24 DEG.C (75.20 DEG.F). The hot air which is supplied to the trim-air pressure regulating-valve 14HK, is unconditioned bleed-air. The hot-air switch 7HK installed in the cockpit overhead panel 30VU controls this valve. AUTO (switch depressed)-The trim-air pressure regulating-valve 14HK pneumatically controls the hot-air manifold pressure to 4 psi (0.2757 bar) above cabin pressure. OFF (switch released)-OFF comes on white, the trim-air pressure regulating- valve 14HK closes. FAULT comes on amber when an overheat condition is detected and remains amber, regardless of the hot-air switch position, until the temperature falls below 70 DEG.C (158.00 DEG.F).
**ON A/C ALL
8. BITE Test
_________
**ON A/C 001-003, 051-054,
(Ref. Fig. 022)
R **ON A/C 004-049, 055-099, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 022A)
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
(Ref. Fig. 023, 024)
A. Built-In Test Equipment (BITE) The zone temperature controller 8HK controls the Built-In Test Equipment (BITE) function for the cockpit and cabin temperature control system. It monitors the hardware. It sends failure data to the Centralized Fault Display System (CFDS) (Ref. 31-32-00). There are the following tests:
-Power-up Test,
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Air Conditioning Panel
R Figure 021B
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