E. Do the Installation Test for the Housing
S 864-031
(1)
Remove the DO-NOT-OPERATE tag from the applicable PACKS selector, on the P5 panel.
S 864-027
(2)
Operate the applicable air cooling pack (Ref 21-00-00/201).
S 794-028
(3)
Feel for leaks around the housing.
(a)
Small leaks are permitted.
(b)
You must repair a large leak.
F. Put the airplane to its usual condition
S 414-029
(1)
Close the applicable access door, 191A-L, 192A-R, 191H-L
(Ref 06-09-03/201).
(2)
Do the procedure to stop the air cooling pack (Ref 21-00-00/201).
S 864-030
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
PACK DISCHARGE OVERHEAT SWITCH - MAINTENANCE PRACTICES
______________________________________________________
1. General_______
A. One pack discharge overheat switch is installed on each pack outlet duct. This procedure has instructions to do the following tasks:
(1)
Remove the Pack Discharge Overheat Switch
(2)
Install the Pack Discharge Overheat Switch
(3)
Do the Pack Discharge Overheat Switch Test.
TASK 21-51-08-002-001
2. Remove the Pack Discharge Overheat Switch (Fig. 201)_________________________________________
A. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
AIPC 21-51-08-01
(3)
AIPC 21-51-08-02
(4)
AIPC 21-51-08-03
(5)
WDM 21-51-21, WDM 21-51-22, WDM 21-51-23
(6)
SSM 21-51-02
B. Access
(1)
Location Zone
133 Air Conditioning Equipment Bay, LH
134 Air Conditioning Equipment Bay, RH
(2)
Access Panel
192H-R Air Conditioning Access Door
191N-L Air Conditioning Access Door
C. Prepare for the Removal
S 862-002
(1) Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.
(a) Put a DO-NOT-OPERATE tag on the selector.
S 862-003
(2) Open the applicable circuit breaker, on the P180 DC Power Distribution Panel, and attach a DO-NOT-CLOSE tag:
(a)
180J2, PACK 1 PROT
(b)
180F2, PACK 2 PROT
(c)
180J17, PACK 3 PROT
S 012-004
(3) Open the applicable access door (AMM 06-09-03/201):
-191N-L for packs 1 or 2
-192H-R for pack 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEPARATOR PACK 2 WATER SEE A 1 2 2. 1. OVERHEAT SWITCH O-RING
PACK 1 WATER
SEPARATOR
PACK DISCHARGE TEMPERATURE
SEE B
SENSOR B
PACK 3 WATERFWD PACK DISCHARGESEPARATOR FWD TEMPERATURE SENSOR A
AIR CONDITIONING
EQUIPMENT BAY
AIR CONDITIONING PACKS NO. 1 AND 2 1 AIR CONDITIONING PACK NO. 1 2
PACK DISCHARGE
A
OVERHEAT SWITCH
PACK DISCHARGE TEMPERATURE SENSOR A
PACK DISCHARGE TEMPERATURE
PACK DISCHARGE SENSOR A
TEMPERATURE SENSOR B
PACK DISCHARGE TEMPERATURE SENSOR B
FWD
PACK 2 GROUND SERVICE CONNECTION FWD
AIR CONDITIONING PACK NO. 2 2 1. OVERHEAT SWITCH
2. O-RING
A
AIR CONDITIONING PACK NO. 3
1 AIRPLANES WITH TWO GROUND SERVICE CONNECTIONS
B
2 AIRPLANES WITH THREE GROUND SERVICE CONNECTIONS
Pack Discharge Overheat Switch Installation
Figure 201
L56518 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 空调 AIR CONDITIONING 2(32)
