(p)
Set the STAB TRIM 2 and 3 switches on the control stand to ON.
(q)
Use the STAB TRIM ALTN switches on the control stand to set the stabilizer to approximately 12 units of trim.
(r)
Set the STAB TRIM 2 and 3 switches on the control stand to CUTOUT.
(s)
Lubricate the ballnut zerk fitting until the grease goes out of the two lower drain holes.
(t)
Set the STAB TRIM 2 and 3 switches on the control stand to ON.
(u)
Hold the STAB TRIM ALTN switches to the APL NOSE UP until the stabilizer position indicators show APL NOSE UP.
(v)
Set the STAB TRIM 2 and 3 switches on the control stand to CUTOUT.
(w)
Lubricate the ballnut zerk fitting until the grease goes out of the two lower drain holes.
(x)
Set the STAB TRIM 2 and 3 switches on the control stand to ON.
S 643-026
(7)
Lubricate the jackscrew upper ballnut and the stabilizer trim jackscrew (Ref par 2.A.(6)) until grease goes out of the lubrication vent plug.
S 413-008
(8)
Close the 312A access door (Ref 06-09-07/201).
S 863-009
(9)
If the hydraulic power is not necessary, do this task: "Remove Hydraulic Power" (Ref 29-11-00/201).
S 863-010
(10)
If the electrical power is not necessary, do this task: "Remove Electrical Power" (Ref 24-22-00/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-21-19
ALL ú ú 01 Page 305 ú Oct 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 12-21-19-643-011
3. Primary Brake Housing Lubrication_________________________________
A. Consumable Materials
(1) D00070 Petroleum Hydraulic Oil - MIL-H-5606
B. References
(1)
06-09-07/201, Fin and Rudder Access Doors and Panels
(2)
24-22-00/201, Manual Control
(3)
29-11-00/201, Main Hydraulic Supply System
C. Access
(1)
Location Zone
221-222 Control Cabin
311-312 Area Aft of Pressure Bulkhead
(2)
Access Panel 312A Horizontal Stabilizer Jackscrew Access Door
D. Procedure
S 863-012
(1)
Apply external power to the AC buses (Ref 24-22-00/201).
S 863-013
(2)
Pressurize the hydraulic systems No. 2 or 3 (Ref 29-11-00/201).
S 863-014
(3)
Use the STAB TRIM ALTN switches on the control stand to set the stabilizer at neutral (3 units of trim).
S 863-015
(4)
Set the STAB TRIM 2 and 3 switches on the control stand to CUTOUT.
S 013-016
(5)
Open the 312A access door (Ref 06-09-07/201).
S 013-017
(6)
Remove the fill cap from the primary brake housing.
S 653-018
(7)
Fill the primary brake housing with Petroleum Hydraulic Oil to the level of the fill port.
(8)
Install the fill cap on the primary brake housing.
(9)
Set the STAB TRIM 2 and 3 switches on the control stand to ON.
S 863-021
(10)
Release the pressure in the hydraulic system if it is not necessary (Ref 29-11-00/201).
S 413-019
S 863-020
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
12-21-19
ALL ú ú 01 Page 306 ú Feb 10/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 863-022
(11)
Remove external power from the AC buses if it is not necessary (Ref 24-22-00/201).
S 413-023
(12)
Close the 312A access door (Ref 06-09-07/201).
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