(2)
The installation of the replacement lip seal
(3)
An operational test of the lip seal.
B.
The lip seal is at the bottom of the primary brake housing of the stabilizer trim drive mechanism.
C.
If there are leaks from the joint, you can replace the lip seal without removing the stabilizer trim drive mechanism.
TASK 27-41-13-004-001
2. Stabilizer Trim Drive Mechanism Lip Seal Removal________________________________________________
A. Special Tools and Equipment
(1)
3MIT65B03670 Horizontal Stabilizer Actuator Safety Rod Adapter
B.
Consumable Materials
(1)
D00633 Grease - BMS 3-33 (Preferred)
(2)
D00013 Grease - MIL-G-23827 (Optional)
C.
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
D.
Access
(1)
Location Zone
311 Area Aft of Pressure Bulkhead, LH
312 Area Aft of Pressure Bulkhead, RH
(2)
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door
E.
Prepare for Removal
(1)
Do this task: "Supply Electrical Power" (AMM 24-22-00/201).
S 864-002
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A
747-400
MAINTENANCE MANUAL
SEE B
STABILIZER
TRIM
NEUTRAL
POSITION
SEE C
1
SEE A
SEE D
SAFETY ROD
SAFETY
ROD NUT
SAFETY ROD
NUT LOCKBOLT A
1 THE STABILIZER IS IN THE NEUTRAL POSITION WHEN THE DIMENSION BETWEEN THE NORMAL SURFACES OF THE BALL NUT AND THE BALL SCREW STOPS IS
7.42 |0.05 INCHES
B
(188.5 |1.3 MILLIMETERS)
Stabilizer Trim Drive Mechanism Lip Seal Installation Figure 401 (Sheet 1)
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A 747-400 MAINTENANCE MANUAL
LANYARD
OIL DRAIN PLUG
OIL FILLER PLUG
LIP SEAL HOUSING
SAFETY ROD TOOL
SAFETY ROD
LIP SEAL O-RING A-A
C
A RETAINING BOLT (2 LOCATIONS) SAFETY SHAFT (3 LOCATIONS) LIP SEAL HOUSING ATTACHMENT SCREW
A SAFETY SHAFT
LOWER GIMBAL RETAINING PIN
D SAFETY SLEEVE SAFETY SLEEVE RETAINING RING
Figure 401 (Sheet 2) Stabilizer Trim Drive Mechanism Lip Seal Installation
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A
747-400
MAINTENANCE MANUAL
S 864-003
WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS,
ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS
CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN
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