757 AMM 飞机维护手册空调 AIR CONDITIONING 1(179)_航空信息_民用航空_通用航空

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pilot's overhead P5 panel, to AUTO. 3) Put all three zone temperature control selectors, on the P5 panel, to AUTO. 4) Make sure the CONTROLLER FAULT light, on the automatic-pack-temperature controller, is off. 5) Push the PRESS/TEST button, on the controller. Make sure that all the lights come on. 6) Push the BIT button, on the controller. Make sure the GO light comes on within 30 seconds. 7) Push the PREVIOUS FLIGHTS button, on the controller. Make sure the GO light comes on within 30 seconds. 8) While the VERIFY and the GO lights are on, push the RESET button.
(3)
The standby-pack-temperature controller also contains some built-in-test-equipment (BITE). It operates the same as the automatic-pack-temperature controller's BITE, except that it does not store the failures in memory. It has switches, lights, and instructions to do the BITE test.

(a)
The switch on the standby-pack-temperature controller has seven positions to test the components or the different operations of the controller. When the switch is pushed, a light will show the condition of the selected component for each air cooling pack. The GO light means there is not a failure. The NO GO light means that the selected component is failed. Here is a list what the controller monitors for each position of the switch: 1) Position 1 - the controller's power supply and bridge

reference.
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2) Position 2 - the maximum compressor temperature output current. 3) Position 3 - the maximum cooling pack temperature output
current. 4) Position 4 - the minimum output current. 5) Position 5 - the 50 percent output current. 6) Position 6 - the standby-pack-temperature sensor for a
shorted or open circuit, or an aircraft wiring problem.
7) Position 7 - the standby-compressor-outlet-temperature sensor for a shorted or open circuit, or an aircraft wiring problem.
(b) Do the standby pack temperature controller BITE test. 1) Supply the electric power. 2) Put the applicable (L or R) PACK control selectors, on the
P5 panel, to STBY-N. 3) Push all of the GO and the NO GO lights, on the controller.
Make sure each one of them come on. 4) Turn the test switch, on the controller, to position 1. 5) Push the test switch. Make sure the GO light comes on. 6) Do the two steps before this one for the test positions 2
through 7.
C. Control (Fig. 18)
(1)
To put the cooling pack system into operation, do these steps:

(a)
Make sure these circuit breakers, on the pilot's-overhead-circuit-breaker panel P11, are closed: 1) LEFT PACK AUTO POWER 2) LEFT PACK STANDBY POWER 3) LEFT PACK AUTO CONT 4) LEFT PACK STANDBY CONT 5) LEFT PACK FLOW CONT 6) RIGHT PACK AUTO POWER 7) RIGHT PACK STANDBY POWER 8) RIGHT PACK AUTO CONT 9) RIGHT PACK STANDBY CONT 10) RIGHT PACK FLOW CONT

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MAINTENANCE MANUAL

FLT COMPT

AIR CONDITIONING CONTROL MODULE

Cooling Pack Control
Figure 18

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(b)
Supply the electrical power (Ref 24-22-00).

(d)
Push the ECS/MSG button on the EICAS MAINT module on the pilot's-right-side panel P61. 1) Make sure the maintenance messages L or R PACK BITE are not

shown on the EICAS display. 2) Make sure the advisory messages L and R PACK OFF are shown on the EICAS display.
　
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