S 414-028
(2)
Put the flexible duct and sleeve on the heater exit and inlet.
NOTE: Do not let the flex hose and sleeve make an overlap on the
____
duct end of more than 1.5 inch.
S 414-029
(3) Install the clamps and tighten to 18-22 pound-inches.
NOTE: Install the clamps .25 inch from the end of the flex hose or
____
sleeve.
S 864-017
(4)
For installation of the captain's shoulder heater, remove the DO-NOT-CLOSE tags and close these circuit breakers on the P70 panel:
(a)
70A5, CAPT AUX HTR LO
(b)
70A6, CAPT AUX HTR HI
S 864-019
(5)
For installation of the first officer's shoulder heater, remove the DO-NOT-CLOSE tags and close these circuit breakers on the right P37 panel:
(a)
37F4, HEATERS F/O AUX HI
(b)
37F3, HEATERS F/O AUX LO
S 704-020
(6)
Do a test of the shoulder heater:
(a)
Supply electrical power (AMM 24-22-00/201).
(b)
Supply pneumatic power (AMM 36-00-00/201).
(c)
Remove the DO-NOT-OPERATE tag and put the left or right pack control selector on the P5 panel in AUTO.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-45-02
ALL ú ú 01 Page 404 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
(d) (e) (f) (g) (h) Put the applicable heater selector in LOW.Make sure warm air comes out of the correct shoulder outlet.Put the applicable heater selector to OFF.Put the applicable left or right pack control selectors on panel P5 to OFF.Remove pneumatic power (AMM 36-00-00/201).
(7) S 864-021Remove electrical power, if it is not necessary (AMM 24-22-00/201).
(8) S 414-022Close the applicable access door (116AR, 115AL, or 113AL).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
21-45-02
ALL ú ú 01 Page 405 ú May 20/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
COOLING PACK SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________
1. General (Fig. 1, 2)_______
A. The cooling pack system is used to decrease the temperature of a supply of air. The output of the cooling pack system is cold air. This cold air is supplied to all of the necessary airplane compartments by the conditioned-air-distribution systems (AMM 21-00-00/001).
B. Other systems are necessary for the cooling pack system to operate. The cooling pack system uses a supply of air from the pneumatic system (AMM 36-00-00/001). This is hot air from the engines, the APU, or a ground air source. The cooling pack system also uses a supply of air from the ram air system (AMM 21-53-00/001). This is cold air which does not enter the air cooling packs. It is used to decrease the temperature of the air in two of the heat exchangers in each air cooling pack. The temperature control system (AMM 21-61-00/001) sends a signal for the necessary output of the cooling pack system.
C. The cooling pack system is made of these components:
(1)
Two air cooling packs, that each has these components:
(a)
A primary heat exchanger
(b)
A secondary heat exchanger
(c)
An air cycle machine (which has a turbine, a compressor, and a fan)
(d)
A split-duct water separator
(e)
A reheater
(f)
A condensor
(g)
A water extractor
(h)
A low-limit control valve
(i)
A temperature control valve
(j)
A compressor-outlet overheat switch
(k)
Two compressor-outlet temperature sensors
(l)
Two pack temperature sensors
(m)
A plenum/diffuser assembly.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：757 AMM 飞机维护手册 空调 AIR CONDITIONING 1(157)
