27-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 715-029
(8)
Find the switches for the FLT CONTROL HYD POWER on the pilot's overhead maintenance panel, P461.
(a)
Set the TAIL switch for the applicable system in the SHUTOFF position. 1) Make sure the motor for the shutoff valve operates smoothly
and stops when the valve gets to the closed position. 2) Make sure the manual indicator lever on the shutoff valve is in the valve closed position. 3) Make sure the VALVE CLOSED light for the switch comes on.
S 715-032
(9)
Move the rudder pedals and the control column through their full travel in each direction.
(a)
Make sure the rudders and elevators do not move.
S 865-018
(10)
Open the circuit breaker for the applicable shutoff valve:
(a)
P180, DC Power Distribution Panel
1) 180E7 ELEV/RUD VLV SYS 2
2) 180E22 ELEV/RUD VLV SYS 4
3) 180H8 ELEV/RUD VLV SYS 1
4) 180H23 ELEV/RUD VLV SYS 3
S 715-033
(11)
Move the manual indicator lever on the shutoff valve to the middle of its travel.
S 715-034
(12)
Close the circuit breaker for the shutoff valve.
(a)
Make sure the motor for the shutoff valve operates smoothly and stops when the valve gets to the closed position.
S 715-035
(13)
Find the switches for the FLT CONTROL HYD POWER on the pilot's overhead maintenance panel, P461.
(a)
Set the TAIL switch for the applicable system to the NORM position. 1) Make sure the motor for the shutoff valve operates smoothly
and stops when the valve gets to the open position.
S 865-025
(14) Remove hydraulic power (Ref 29-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 095-026
WARNING:_______ MAKE SURE THE NOSE LANDING GEAR IS POINTED FORWARD. IF THE
TIRES ARE NOT PARALLEL WITH THE AIRPLANE, THEY CAN TURN QUICKLY
WHEN YOU REMOVE THE TOW PIN. THIS CAN CAUSE INJURY TO PERSONS
AND DAMAGE TO EQUIPMENT.
(15)
Remove the TOW PIN from the nose landing gear (Ref 09-11-00/201). S 865-027
(16)
Remove electrical power if it is not necessary (Ref 24-22-00/201). S 415-028
(17)
Close the access door 312A (Ref 06-09-05/201).
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27-23-00
ALL ú ú 01 Page 505 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
RUDDER AND ELEVATOR HYDRAULIC SHUTOFF VALVE - REMOVAL/INSTALLATION
__________________________________________________________________
1. General_______
A. There are four shutoff valves for the rudder and elevator systems. This procedure gives the instructions to remove and install these four shutoff valves.
B. The removal task has these basic steps:
-Prepare for the removal
-Get access to the 48 section
-
Remove the shutoff valve.
C.
The installation task has these basic steps:
-Install the shutoff valve
-Do a test of the shutoff valve
-Put the airplane back to its usual condition.
TASK 27-23-01-004-001
2. Rudder and Elevator Hydraulic Shutoff Valve Removal (Fig. 401)___________________________________________________
A. Standard Tools and Equipment
(1)
Bucket - 1 Gallon capacity
B.
References
(1)
06-09-05/201, Body Section 48 Access Doors and Panels
(2)
12-12-01/301, Hydraulic Systems
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