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 27-31-01
 ALL  ú ú 01 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (8)  
AIPC 27-38-01, Fig. 1

 (9)  
AIPC 55-50-14, Fig. 1

 C.
Access

 (1)  
Location Zone
 335 Inboard Elevator, LH
 345 Inboard Elevator, RH

 (2)  
Access Panel
 334HBL Inboard Elevator Actuator Access Panel
 344HBR Inboard Elevator Actuator Access Panel
 335BBL Leading Edge Hinge Maintenance Access Door
 345BBR Leading Edge Hinge Maintenance Access Door
 335JBL Leading Edge Hinge Maintenance Access Door
 345JBR Leading Edge Hinge Maintenance Access Door

 D.
Prepare for Removal

 S 494-002
 (1)  
Attach the safety device to the receptacle on the top surface of the horizontal stabilizer.

 S 864-003

 (2)  
Apply external power to the AC buses (AMM 24-22-00/201).

 S 864-004

 (3)  
Set all FLT CONTROL HYD POWER TAIL switches on the P461 Pilots' Overhead Maintenance Panel to SHUTOFF.

 S 864-059

 (4)  
Pressurize the hydraulic system No. 2 (left stabilizer trim), or 3 (right stabilizer trim) (AMM 29-11-00/201).

 S 864-007

 (5)  
Use the STAB TRIM ALTN switches to move the stabilizer to the neutral position (3 units of trim) (AMM 27-41-00/201).

 S 864-008

 (6)  
Release the pressure in the hydraulic system No. 2 (left stabilizer trim), or 3 (right stabilizer trim) (AMM 29-11-00/201).

 (7)
Set the STAB TRIM 2 and 3 switches on the control stand to CUTOUT.

 S 864-009
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-31-01
 ALL  ú ú 01 Page 402 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 864-010
 (8)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E6, STAB TRIM L CONT
 2) 7E7, STAB TRIM L S/O VLV
 3) 7E8, STAB TRIM L RATE
 4) 7E19, STAB TRIM R CONT
 5) 7E20, STAB TRIM R S/O VLV
 6) 7E21, STAB TRIM R RATE
 7) 7E23, STAB TRIM ALTN CONT

 (b)  
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 864-011
 (9)  Move the control column until the elevator is in the full up position.
 NOTE: When you move the control column through the elevator cable
____ system, it will move the elevator PCP lever.
 S 014-012
 (10)
 Remove these access panels (Ref 06-09-06/201):

 (a)  
Access panel 334HB for the left inboard elevator PCP (or 344HB for the right inboard elevator PCP).

 (b)  
Access panels 335BB, 335DB and 335JB for the left inboard elevator hinges (or access panels 345BB, 345B and 345JB for the right inboard elevator hinges).

 E.
Remove the Inboard Elevator

 S 494-013
 (1)  
Attach the sling assembly:

 (a)  
Remove bolts at the hoist points.

 (b)  
Install the sling assembly at the hoist points on the inboard elevator (Fig. 401).

 (c)  
Lift the sling sufficiently to hold the 550 pound weight of the inboard elevator.

 S 024-014
 (2)  
Remove the inboard elevator:

 (a)  
Make sure the inboard elevator PCP is attached to the structure.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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