(2)
Cut out crack with a 0.06 inch wide slot into stop pin hole.
(3)
Enlarge stop fitting hole to provide a 0.002 to 0.012-inch diameter clearance with learning plate.
(4)
Pretreat surfaces (Method II) and apply Alodine per 51-21-41 and 51-21-21, Cleaning and Painting. Apply primer per 51-20-171, Cleaning and Painting.
(5)
Bond bearing plate back in using BMS 5-79 or 5-95 sealant.
500
Jan 20/82 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-31-0 Page 801
Cargo Door Approved Repair 500
52-31-0 Figure 801 Jan 20/82
Page 802
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CARGO COMPARTMENT DOOR BALANCE MECHANISM - REMOVAL/INSTALLATION
1. General
A. The balance mechanisms installed on the forward and aft cargo compartment doors are similar. After installation of the balance mechanism, no further rigging is necessary.
2. Equipment and Materials
A. Door support brace, 2 x 4 inch wood painted red of suitable length to support the door in open position, or equivalent
B. C-clamp (or equivalent) to hold balance mechanism cable
C. Grease - BMS 3-24 (Ref 20-30-21)
3. Remove Balance Mechanism
A. Using the door support brace, position cargo compartment door as necessary to facilitate balance mechanism removal.
B. Deleted.
C. Place clamp on cable at interior surface of door to prevent cable from retracting when
disconnected from overhead beam.
D. Remove bolt connecting cable clevis (7) to support clip (9) on overhead floor beam (1).
E. Remove clamp installed on cable (step C).
CAUTION: CABLE IS UNDER HIGH TENSION. HOLD CABLE FIRMLY DURING REMOVAL OF CLAMP. RELEASE CABLE GRADUALLY, PERMITTING SPRINGS TO RETRACT SLOWLY.
F. Remove screws in cable drum access panel and remove panel.
G. Remove lining retainer studs and remove insulation from door inner skin.
H. Remove bolt connecting cable assembly clevis to splice plate (2). Unhook springs (3) from door structure. Remove springs (3) and splice plate (2).
I. Remove four bolts and remove four pulleys (5) from door.
Aug 15/77 52-31-11 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Cargo Compartment Door Balance Mechanism Installation 526
52-31-11 Figure 401 (Sheet 1) May 15/70
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
516 Cargo Compartment Door Balance Mechanism Installation
Aug 15/79 Figure 401 (Sheet 2) 52-31-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
J. Remove bolt, cable drum (6) and cable assembly (4) from door.
K. Cut safety wire and unwind cable from cable drum.
4. Install Balance Mechanism
A. Open door and position door support brace to hold door open.
WARNING: TO AVOID INJURY OF PERSONNEL WORKING ON OR NEAR THE DOOR, ALWAYS USE THE RED COLORED DOOR SUPPORT BRACE TO SECURE THE DOOR IN OPEN POSITION WHEN THE DOOR BALANCE MECHANISM IS DISCONNECTED OR INOPERATIVE.
B Attach cable assembly (4, figure 401) to cable drum (6) by nesting terminal ball (10, detail A) in hole on drum and securing with lockwire. Place pigtail in hole on cable drum with the terminal ball, not in grooves of cable drum.
NOTE: Ensure cable assembly is lubricated with MIL-G-25760 grease. If not, lubricate entire length of cable per step I. prior to installation on door.
C. With long end of cable assembly from terminal ball (10) toward inboard side of door, wind other end of cable on drum toward outboard side of door until a total of one and one-half turns cable wrap is made. (See detail A.)
D. Position cable drum and cable assembly on the door. Insert bolt in cable drum and torque to
within 80 to 90 pound-inches.
E Thread cable assembly through pulley brackets, inner webs, and inner skin on door.
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