(a)
If a switch roller touches a cam surface,
Replace the mounting bracket:
1) Remove the switch assembly (Ref paragraph 2.).
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747-400 MAINTENANCE MANUAL
2) Install the switch assembly with a new mounting bracket (Ref. paragraph 3.).
S 864-016
(7)
If the electrical power is not necessary, do this task: "Remove Electrical Power" (AMM 24-22-00/201).
S 864-017
(8)
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (AMM 29-11-00/201).
TASK 27-41-08-004-073
4. Fuel Range Limit Switch Removal (Fig. 401)_______________________________
A. References
(1)
AMM 06-09-05/201, Body Section 48 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AIPC 27-41-04, Fig. 3
(5)
SSM 28-21-03
(6)
WDM 28-21-25
B.
Access
(1)
Location Zone
311 Area Aft of Pressure Bulkhead, LH
(2)
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door
C.
Procedure
S 864-030
(1)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P180, DC Power Distribution Panel 1) 180B2, FUELING LIGHTS HOT
(b)
P414, Power Distribution Center - Left 1) 414F22, LIGHT FUELING
(2)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 864-070
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(3) S 864-031Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).
(4) S 864-032Hold the STAB TRIM ALTN switches to APL NOSE DN until the stabilizer stops.
(5) S 864-033Set the STAB TRIM 2 and 3 switches to CUTOUT.
(6) S 864-034Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P7, Overhead Circuit Breaker Panel 1) 7E7, L STAB TRIM S/O VLV 2) 7E20, R STAB TRIM S/O VLV
(7) S 864-035Do this task to release the pressure in the hydraulic systems No. 2 and No. 3: "Remove Hydraulic Power" (AMM 29-11-00/201).
(8) S 864-071Do this task: "Remove Electrical Power" (AMM 24-22-00/201).
(9) S 014-036Open the access door 312A (AMM 06-09-05/201).
S 034-038
(10)
Cut the splices to isolate the switch wires from the wire bundle (WDM 28-21-25).
S 024-039
(11)
Remove the fuel switch:
(a)
Identify the wire bundle conductors.
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(b)
Remove the locknut.
(c)
Remove the fuel switch.
TASK 27-41-08-404-074
5. Fuel Range Limit Switch Installation____________________________________
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