F. Mark each individual overhead support structure assembly for reinstallation in original location.
G. When not secured by jamnut, lockwire or other device, maintain original adjustment of turnbuckles by application of sealing compound to turnbuckle at junction of tube and rod end or by other suitable method.
3. Remove Overhead Support Structure System (Fig. 401)
A. Disconnect joint splice channels from upper rail by removing bolts and nuts from end of splice channel with unslotted holes only.
NOTE: Do not loosen fasteners installed in slots at opposite end of channels.
Feb 15/78 25-21-581 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Overhead Support Structure System 518
25-21-581 Figure 401 Feb 15/78
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Disengage fasteners securing turnbuckles and diagonal braces to structure.
NOTE: Do not change adjustment of turnbuckles or position of diagonal braces relative to rest of assembly while removing and storing support structure system assemblies.
4. Install Overhead Support Structure System (Fig. 401)
A. Place individual support assembly in location from which it was removed and engage and tighten fasteners attaching turnbuckle assemblies to structure.
NOTE: Do not change adjustment of turnbuckles or position of diagonal braces relative to rest of support structure system while installing support structure system assemblies.
B. Engage and tighten fasteners attaching diagonal braces to structure.
C. Attach joint splice channel to rail of adjacent support assembly by inserting bolts through unslotted holes in channel and rail, and installing attaching washers and nuts.
NOTE: Do not loosen or remove fasteners in slots at opposite end of channel during installation.
5. Restore Airplane to Required Configuration
A. Install carry-all compartments as required (Ref 25-24-511).
B. Install end caps with attached filler panels (Ref 25-24-512).
C. Install, as required, lowered ceiling side panels that attach to overhead support structure (Ref 25-21-351).
D. Install curved ceiling panels as required (Ref 25-21-341).
E. Install any passenger equipment such as partitions and closets which were removed to allow removal of overhead support structure.
518
Feb 15/78 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 25-21-581 Page 403
PASSENGER SEATS - DESCRIPTION AND OPERATION
1. General
A. Passenger seats are attached to seat tracks in the floor, and may be rearranged for different passenger configurations by moving the seats forward or aft on the seat tracks. The seat tracks are beams of special cross section and are bolted to the floor structure. They are provided with circular cutouts for the seat studs and lockpins, by means of which the seats are fixed in position. The cutouts in the tracks are spaced 1 inch apart. The passenger seat equipment consists of double passenger seats and triple passenger seats.
B. To ensure rapid opening of escape hatches, a hatch-mounted armrest replaces the outboard armrest fixed to the seat base on each seat adjacent to an escape hatch.
2. Underseat Baggage Restraint
A. An underseat baggage restraint is installed beneath each passenger seat to prevent any articles of luggage placed under the seat from sliding forward. The baggage restraint consists of a structural tube extending across the seat legs and is supported by brackets on the back of the seat front legs.
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