(4)
Open the circuit breaker for the applicable hydraulic system and attach a DO-NOT-CLOSE tag:
(a)
P7 Overhead Circuit Breaker Panel 1) 7F3 HYDIM 1 2) 7G3 HYDIM 2 3) 7H3 HYDIM 3 4) 7J3 HYDIM 4
S 034-006
(5)
Disconnect the electrical connector from the switch for the low pressure warning for the reservoir.
S 034-007
(6)
Remove the bolt which attaches the bonding jumper to the switch.
S 034-008
(7)
Remove the lockwire from the switch.
S 024-009
(8)
Remove the switch from the manifold.
S 034-010
(9)
Remove the O-ring from the switch.
S 034-032
(10)
Discard the O-ring.
TASK 29-17-08-404-011
3. Reservoir Low Pressure Warning Switch Installation (Fig. 401)
__________________________________________________
A. Consumable Materials
(1)
D00567 - Lubricant - Skydrol Assembly Lube, MCS 352
(2)
G00095 Detector-Leak, Leak-Tek (160X)
B.
References
(1)
AMM 20-22-01/601, Electrical Bonding
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 36-00-00/201, Pneumatic System
(4)
AMM 54-62-00/201, Nacelle Strut Access Panels
(5)
AMM 54-62-02/501, Nacelle Strut Access Doors
(6)
IPC 29-17-51
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29-17-08
ALL ú ú 03 Page 403 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
C. Access
(1)
Location Zone
454 System 1 - Strut Aft Fairing
464 System 2 - Strut Aft Fairing
474 System 3 - Strut Aft Fairing
484 System 4 - Strut Aft Fairing
(2)
Access Panel
454A Trailing Edge Fairing Doors - System 1
464A Trailing Edge Fairing Doors - System 2
474A Trailing Edge Fairing Doors - System 3
484A Trailing Edge Fairing Doors - System 4
D.
Procedure
S 644-012
(1)
Apply lubricant to the new O-ring and the threads on the switch for the low pressure warning for the reservoir.
S 434-013
(2)
Install the O-ring on the switch.
S 424-033
(3)
Install the switch into the manifold.
S 434-034
(4)
Tighten the switch to 145-155 pound-inches (16-17 N.m).
S 434-035
(5)
Install a lockwire between the switch and the adapter.
S 434-016
(6)
Install the nut, washers, and bolt to attach the bonding jumper to the switch.
S 764-017
(7)
Measure the resistance between the bonding jumper on the switch and the airplane structure (AMM 20-22-01/601).
NOTE: This resistance must be less than 0.0025 ohms.
S 434-018
(8)
Connect the electrical connector to the switch.
(a)
Loosen the collar on the backshell.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-17-08
ALL ú ú 03 Page 404 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
Pull the backshell down to move the serrations apart.
(c)
Turn the backshell to make the wire bundle straight.
(d)
Tighten the collar on the backshell.
S 864-019
(9)
Supply electrical power (AMM 24-22-00/201).
S 864-020
(10)
Remove the DO-NOT-CLOSE tag and close the circuit breaker for the applicable hydraulic system:
(a)
P7 Overhead Circuit Breaker Panel
1) 7F3 HYDIM 1
2) 7G3 HYDIM 2
3) 7H3 HYDIM 3
4) 7J3 HYDIM 4
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 液压 HYDRAULIC 2(84)
