757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(195)

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 c) The low limit valve will move to the open position.
 d) The LOW LIMIT VALVE light on the pack temperature
 controller comes on.
 e) If the LOW LIMIT light is on, push the RESET button on
 the L (R) pack temperature controller.
 S 865-419
 (5) Move the L (R) PACK temperature selector to the OFF position.
 I.  Put the airplane back to its usual condition:
 ú
 ú  S 865-421
 ú  (1) Shut down the APU (AMM 49-11-00/201) or remove the ground pneumatic
 ú  air (AMM 36-00-00/201) if it is not necessary.
 ú
 ú  S 865-423
 ú  (2) Put the air/ground relay system back to the ground mode as required
 (AMM 32-09-02/201).

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 21-51-00
 ALL  ú ú 06.1 Page 531 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 S 445-226
 (3)  
Do the activation procedure for the spoilers (AMM 27-61-00/201) if you did the deactivation procedure.

 S 865-425

 (4)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 21-51-00-705-264
 7. Heat Exchanger Test (Fig. 504)
___________________
 A. General
 (1)  
This procedure has the steps to do a health check for the primary and secondary heat exchangers.

 (2)  
A health check gives a quick indication that the system operates correctly.

 B.
Special Tools and Equipment

 (1)  
Thermocouple Probe - P/N 98220K, Omega Technologies, Stamford, CT 06907

 C.
References

 (1)  
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 21-51-00/501, Operational Test - Cooling Pack System

 (3)  
AMM 21-61-00/501, Operational Test - Primary (Zone) Temperature Control System

 (4)  
AMM 24-22-00/201, Electrical Power - General

 (5)  
AMM 27-61-00/201, Spoiler/Speedbrake Control System

 (6)  
AMM 32-09-02/201, Air/Ground Relays

 (7)  
AMM 49-11-00/201, Auxiliary Power Unit

 (8)  
AMM 49-61-05/201, APU Control Unit (ECU)

 (9)  
AMM 77-12-03/401, Engine Speed Card

 D.
Access

 (1)  
Location Zones
 135/136 Environmental control system (ECS) bay
 211/212 Control cabin

 (2)  
Access Doors
 193HL Environmental control system bay (left)
 194ER Environmental control system bay (right)

 E.
Prepare for the Test

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-429

 (2)  
Make sure all circuit breakers for the air conditioning system are closed.

 S 865-431

 (3)  
Make sure the BLEED AIR L ENG and BLEED AIR R ENG switches on the P5 panel are OFF.

 S 865-427
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 ú ú  ú 12.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 532Sep 28/02 

A

757
MAINTENANCE MANUAL

 (4)  S 745-231Do the BITE tests for these components: (a) Pack temperature controller (AMM 21-51-00/501) (b) Standby temperature controller (AMM 21-51-00/501). (c) Zone temperature controller (AMM 21-61-00/501). (d) APU ECU (AMM 49-11-00/501).
 (5)  S 015-232Open the left (right) air conditioning bay doors.
 (6)  S 865-433Push the AUTO switch on the display select panel, P7.
 (7)  S 865-435Push the ECS/MSG switch on the EICAS maintenance panel, P61.
 (8)  S 865-437Set the L (R) RECIRC FAN switches to ON.
 (9)  S 865-439Set the temperature selectors (FLT DK, FWD CAB, and AFT CAB) on the P5 panel to AUTO (8:00 o'clock position).
 S 865-441
　
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