MAIN GEAR DOWNLOCK STRUT - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Ground Lock Assemblies (Ref 32-00-01)
B. Bullet Nosed Thread Protector - F80115-4 or F80115-13
C. Bullet Nosed Thread Protector - F80115-3 or F80115-12
D. Grease - MIL-G-21164 or MIL-G-23827 optional to BMS 3-33 (Ref 20-30-21)
2. Remove Main Gear Downlock Strut
A. Check that ground lock assemblies (Ref 32-00-01) are installed in all gear.
B. Jack airplane until wheels are just touching ground (Ref Chapter 7, Jacking Airplane).
C. Remove downlock springs (2, Fig. 401) (Ref 32-32-91 R/I).
D. Disconnect head end of downlock actuator (1) from reaction link.
E. Remove bolt keeper (6) retaining bolt (5).
F. Remove bolt (5) securing downlock strut (3) to reaction link.
G. Remove lock strut lower attachment bolt (10) and remove downlock strut (3).
3. Install Main Gear Downlock Strut
A. Clean and lubricate with grease, all bolts, shafts, washers, and bushings except downlock strut/reaction link bolt (5, Fig. 401).
B. Connect downlock actuator (1) to lugs on reaction link (4).
C. Tighten each nut 160 to 190 pound-inches lube torque. Interchange nuts and/or add AN960D washer if necessary to align castellation with cotter pin hole within torque limits. Lock nuts with cotter pins.
D. Connect downlock strut (3) to reaction link (4).
(1)
Align downlock strut with reaction link.
(2)
Insert bolt (5) from keeper side.
(3)
Add washer and nut.
(4)
Install keeper (6) with washer and bolt.
(5)
Tighten nut on bolt 100 to 150 pound-inches dry torque.
(6)
If necessary, slack off nut to align nearest castellation slot with cotter pin hole. Lock nut with cotter pin.
E. Install bolt (10) fram aft side. Tighten nut 1000 to 1500 pound-inches lube torque.
F. Install downlock springs (2) (Ref 32-32-91 R/I).
G. Lubricate landing gear (Ref Chapter 12, Main Landing Gear Lubrication).
H. Jack airplane for gear retraction (Ref Chapter 7, Jacking Airplane).
I. Remove ground lock assemblies (Ref 32-00-01) and pressurize hydraulic system
(Ref 29-11-0 MP).
J. Retract and extend gear and examine reaction link and associated parts to assure that all affected parts function correctly.
K. With gear down and locked, check that red paint stripes on downlock strut lower link (7) and lower side strut (9) align.
NOTE: If existing stripes do not align, refer to SB 32-1101 for painting instructions.
L. Install ground lock assemblies (Ref 32-00-01), lower airplane, and remove jacks.
Sep 01/02 32-11-131 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Main Gear Downlock Strut Installation 551
32-11-131 Page 402 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/91
MAIN GEAR WHEEL WELL SEAL SYSTEM - DESCRIPTION AND OPERATION
1. General
A. When the airplane is in flight and the landing gear retracted, the main gear wheel well seal system eliminates noise and reduces drag by preventing air from flowing in and out of the wheel well. With landing gear retracted, the wheel well opening is faired to the body by the tire and a special hubcap installed on the outboard wheel and by a fairing ring installed at the lower edge of the wheel well opening. The circular cross section of the tire leaves a space between the tire and outer edge of the wheel well, this space is closed by the seals as the gear is fully retracted. (See figure 1.)
B. Each wheel well seal consists of a series of flexible blade-type segments around the periphery of the wheel well, except at the openings on the outboard edge where the strut must pass through. Seal segments are held in place by a series of seal retainers on the upper and lower surface of the segments at the outer edge of the segments. The seal segments are secured between the seal retainer segments with bolts.
528
May 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 32-12-01 Page 1
Main Gear Wheel Well Seal Component Location 500
32-12-01 Figure 1 Feb 15/70
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
MAIN GEAR WHEEL WELL BLADE-TYPE SEAL - REMOVAL/INSTALLATION
1. General
A. The seal segments may be replaced singly, in groups, or all may be replaced at one time. If all segments are being replaced, exercise care to reinstall seal retainer segments in the same position from which were removed. Each seal segment and each seal retainer segment was designed to fit at a designated area.
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