C. Electrical power supply, 28 volts dc
D. Grease - VV-P-236 (Ref 20-30-21)
2. Prepare Speed Brake Forward Drum and Lever Brake for Removal
A. Depressurize hydraulic systems A and B (Ref 27-62-0 MP).
B. Check that electrical power is off.
C. Place speed brake control lever in DOWN position.
D. Open lower fuselage nose compartment access door.
E. Remove left forward, nose wheel well access panel.
3. Remove Speed Brake Forward Drum and Lever Brake
A. Disconnect speed brake control cables.
(1)
Secure cables to maintain a slight cable tension when turnbuckles are disengaged.
(2)
Disengage turnbuckles located in aft portion of lower nose compartment.
(3)
Identify cables for subsequent installation.
(4)
Remove cable retainers and cables from speed brake forward drum.
B. Remove speed brake forward drum (Fig. 401).
(1)
Break lockwire and remove from quadrant retaining bolt.
(2)
Remove quadrant retaining bolt and washer.
500
Feb 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-62-21 Page 401
G38958G42484
Speed Brake Forward Drum and Level Brake Installation 531
27-62-21 Figure 401 (Sheet 1) Feb 15/73
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Speed Brake Forward Drum and Lever Brake Installation
Feb 20/93 Figure 401 (Sheet 2) 27-62-21
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(3) Remove speed brake forward drum from splined shaft.
NOTE: Hold spring-loaded lever away from forward drum to allow removal of forward drum.
C. Remove lever brake assembly.
(1)
Disconnect speed brake lever actuator rod end from lever brake.
(2)
Disconnect lower control rod from lever brake input arm.
(3)
Remove lever brake retaining locknut from shaft.
(4)
Remove bolts from bearing retainers at each end of lever brake shaft.
(5)
Remove lever brake from airplane.
NOTE: Mounting brackets are slotted to allow shaft to be lowered for removal.
4. Install Speed Brake Forward Drum and Lever Brake
A. Install lever brake (Fig. 401)
(1) Adjust lever brake backlash.
(a)
Check that primary backlash total gap is 0.020 to 0.023 inch equally distributed between each set screw and brake shoe assembly. If gap is within limits specified, proceed per step (3). If not, adjust per step (b).
(b)
Adjust lever brake backlash as follows: 1) Measure total secondary backlash gap on brake shoe assembly (View I, Fig. 401).
2) Install two shims in gaps, each equal to one half total secondary backlash gaps, to centralize the drive arm and shoe pivot point.
NOTE: Do not adjust secondary backlash set screws.
3) Adjust primary backlash set screws to provide a total gap of 0.020 to 0.023 inch equally distributed between each set screw and brake shoe assembly.
NOTE: When checking gaps, care must be taken to ensure that springs or brake shoes are not compressed.
4) Remove two shims from lever brake assembly.
(2)
Apply a thin film of lubricant to inner and outer edges of alloy steel friction quadrant (See detail A).
(3)
Install lever brake assembly.
(a)
Position bearings and bearing retainers on lever brake shaft ends and locate in airplane.
(b)
Install eleven bolts in two bearing retainers. Secure with washers and locknuts. Coat bolts with primer prior to installation.
(c)
Install lever brake retaining locknut onto shaft.
(d)
Attach lower end of lower control rod to lever brake input arm. Install bolt with head inboard. Secure bolt with washer and locknut.
500
27-62-21 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/93
B. Install speed brake forward drum.
(1)
Install washer on splined shaft.
(2)
Install forward drum quadrant on splined shaft.
NOTE: Shaft and quadrant splines are made with a missing tooth to ensure correct indexing.
(3)
Install washer and quadrant retaining bolt. Tighten bolt within 40 to 50 pound-inch torque range.
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