S 863-023
(2)
Put the flap control lever in the 30-unit detent to extend the trailing edge flaps.
S 863-024
(3)
Do this task to depressurize hydraulic systems No. 1 and 4: "Hydraulic System Depressurization (AMM 29-11-00/201) or, if electrical power is on, put the FLT CONTROL HYD POWER - WING switch to SHUTOFF and attach a DO-NOT-OPERATE tag.
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A
747-400
MAINTENANCE MANUAL
S 643-025
(4) Lubricate the ballscrew actuators: Refer to Fig. 302 for the inboard flaps and Fig. 306 for the outboard flaps.
NOTE:____Optional: To ensure voids are filled, lubricate ball screw nut at flaps 30 and relubricate at flaps 25.
E. Put the Airplane Back to Its Initial Condition
S 863-026
(1)
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201), or remove the DO-NOT-OPERATE tag and move the FLT CONTROL HYD POWER - WING switch to NORM.
S 863-027
(2)
Put the flap control lever in the UP detent to retract the trailing edge flaps.
S 863-028
(3)
Do this task to depressurize hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).
TASK 12-21-20-643-029
4. Inboard Flap Inboard Track Ring Spring Lubrication__________________________________________________
A. Consumable Materials
(1)
D00633 Grease - BMS 3-33 (recommended)
(2)
D00013 Grease - MIL-G-23827 (alternative)
B. References
(1)
AMM 27-51-26/401, Inboard Flap Track Fairings
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
OHM 57-22-11, Flap Track Attach Ring Spring Assembly
C. Access
(1) Location Zone 561 Inboard Flap Track Fairing, Inboard Flap, LH 661 Inboard Flap Track Fairing, Inboard Flap, RH
D. Procedure
S 863-030
(1)
Do this task to pressurize hydraulic systems No. 1 and 4: "Hydraulic System Pressurization" (AMM 29-11-00/201).
S 863-031
(2)
Put the flap control lever in the 30-unit detent to extend the trailing edge flaps.
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A 747-400 MAINTENANCE MANUAL
(3) S 863-032Do this task to depressurize hydraulic systems No. 1 and 4: "Hydraulic System Depressurization (AMM 29-11-00/201).
(4) S 013-033Do this task: "Inboard Flap Track Fairing Removal" (AMM 27-51-26/401).
(5) S 023-050Remove an inboard flap, ring spring assembly.
NOTE:____ Remove one ring spring at a time when you lubricate the ring spring (Fig. 302). Install the ring spring immediately after you lubricate it. Adjust the ring springs after you install all of them.
(a) (b) Remove the nut, self-aligning washers and bolt.Remove the ring spring assembly.
(6) S 643-051Lubricate the ring spring assembly: (a) Disassemble the ring spring assembly (OHM 57-22-11).
NOTE:____ Do not remove the retainer from the top of the ring spring assembly.
(b) (c) Butter lubricate each ring spring.Assemble the ring spring assembly (OHM 57-22-11).
(7) S 423-052Install the inboard flap, ring spring assembly: (a) Apply a layer of grease to the bolt and self-aligning washers. (b) Install the washers, ring spring assembly, self-aligning washers, nut and bolt in the sequence shown in section A-A, Fig. 302.
NOTE:____ Install the bolt head down.
(c) Tighten the nut to 800-1400 pound-inches.
NOTE:____ Do this to put the ring springs and the self-aligning washers to the correct preload (compression).
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