(q)
After allowing sufficient time for the thermal switch to cool, push the TRIP RESET button, and check that the DUCT OVERHEAT light and MASTER CAUTION lights and AIR COND annunciator light go out.
(r)
Reinstall 190-degree duct overheat thermal switch.
(s)
Hold temperature selector knob to manual warmer until mix valve has moved away from full cold position, then release and move PACK switch to OFF. Check that mix valve does not move toward the cold position.
(t)
Connect electrical connector to pack valve.
(u)
Check that mix valve returns to the full cold position.
(v)
Hold thin sheet of paper or streamer over control cabin temperature sensor inlet and verify that air is being drawn into the inlet.
NOTE: At approximately 140°F (60°C) the mix valve will start toward the cold position.
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(5) Restore Airplane to Normal Configuration
(a)
Remove all test equipment from the airplane.
(b)
Reinstall the aft bulkhead of the forward cargo compartment.
(c)
Close air conditioning equipment bay doors.
(d)
If no longer required, remove electrical power from airplane.
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C. Temperature Control System Operation Test
(1)
General
(a)
The operation test of the temperature control system requires that the pneumatic system be pressurized. Compressed air may be supplied to the system by either engine bleed, auxiliary power unit (APU), or by a ground pneumatic cart. The test is applicable to either PASS CABIN or CONT CABIN temperature control system.
(b)
There are three tests provided. Test Temperature Control System Operation and Test Duct Temperature Limit Sensor (Topping Control) check those components within the system, which provide correct temperature during normal operation. Test Duct Overheat Protection Operation checks the overheat components and circuit which do not become activated during normal operation.
(c)
The tests may be performed in sequence or separately. The test preparation, par. C.(2), however, must be accomplished before starting either or all tests and the restore to normal, par. C.(6), after completing either or all tests.
(d)
Prior to running the test it should be determined that the pneumatic system, cooling packs, and ram air systems are functionally correct without excessive leakage from the air supply ducts.
(2)
Prepare to Test Temperature Control System
(a)
Supply electrical power to all airplane busses.
(b)
Pressurize the pneumatic system and open valves as required to provide air supply to the control or passenger cabin air conditioning system being tested (Ref Chapter 36, Pneumatic).
(c)
Check that all air conditioning circuit breakers on panels P6-3 and P6-4 are closed and that air conditioning switches are off.
(d)
Check that the mix valve is in the full cold position by observing the CABIN AIR MIX VALVE indicator.
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NOTE: The indicator is reading full cold when the pointer aligns with the inner of the two closely spaced index marks at the COLD end of the indicator scale. Full hot is at the inner of the two closely spaced index marks at the other end of the scale.
(3) Test Temperature Control System Operation
(a)
Move AIR TEMP selector to the PASS CABIN (CABIN) position and record
temperature.
NOTE: The control cabin temperature may be taken as approximately the same as the passenger cabin when checking control cabin temperature control.
(b)
Check automatic temperature control using appropriate method according to existing cabin temperature. 1) Check automatic temperature control when existing cabin temperature is below
83°F (28°C).
a) Set temperature selector a few degrees above cabin temperature as
recorded in step (a).
b) Move PACK switch to ON (OPEN).
c) Check that mix valve moves toward HOT.
2) Check automatic temperature control when existing cabin temperature is above 83°F (28°C). a) Move temperature selector knob to 85°F (30°C) if cabin temperature is
above 85°F (30°C). If cabin temperature is between 83 and 85°F (28 and 30°C), set the selector at cabin temperature.
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