CROTCH STRAP
LAP STRAP AND
HANDWHEEL FOR
ROTARY BUCKLE
SEATBACK
LIFE JACKET LUMBAR
STOWAGE SUPPORT UP/DOWN ADJUSTMENT
HANDWHEEL FOR
CONTROL LEVER SEATBACK LUMBAR
FOR INERTIA SUPPORT IN/OUT
SEAT BOTTOM
REEL LOCK ADJUSTMENT
CUSHION
CONTROL LEVER FOR SEAT RECLINECONTROL LEVER FOR VERTICAL
SEAT BASE
ADJUSTMENT CONTROL LEVER FOR
CONTROL LEVER
ATTACHMENT OUTBD
FORWARD AND AFT BOLT SEAT BASE FOR LATERAL
ADJUSTMENT FWD FWD ADJUSTMENT
RIGHT SIDE LEFT SIDE
OUTBD
FIRST OBSERVER'S SEAT
SHOULDER HARNESS
SEAT BACK CUSHION
HANDWHEEL FOR SEATBACK LUMBAR SUPPORT UP/DOWN ADJUSTMENT
ADJUSTABLE ARMREST
LIFE JACKET
LAP STRAP AND STOWAGE
ROTARY BUCKLE
CROTCH STRAP HANDWHEEL FOR SEATBACK
SEAT BOTTOM LUMBAR SUPPORT
CUSHION IN/OUT ADJUSTMENT
SEAT BASE
CONTROL LEVER FOR INERTIA REEL LOCK STOWAGE BOX
ACCESS OUTBD DOOR
CONTROL LEVER FOR SEAT RECLINE FWD
SECOND OBSERVER'S SEAT
Observer's Seats
Figure 2
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25-11-00
ALL ú ú 01 Page 3 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
C. The second observer seat is mounted on top of a book stowage compartment on the left side of the compartment and is not capable of horizontal, lateral or vertical adjustments.
D. The second observer seat contains manually operated controls for seat back recline and lumbar support adjustments only.
E. Both seats are also provided with adjustable armrests, manual/automatic inertia reel shoulder harness, lap straps with rotary buckle and crotch strap, and lifejacket stowage.
4. Operation
_________
A. General
(1)
The captain's seat and the first officer's seat operate on 115-volt ac power. The source of the electrical power for the captain's seat comes from the main generator bus No. 2 through the 414D8 CAPT PWR SEAT circuit breaker on the P414 Power Distribution panel. The source of the electrical power for the first officer's seat comes from the main generator bus No. 3 through the 415H32 F/O PWR SEAT circuit breaker on the P415 Power Distribution panel.
(2)
The airplane is equipped with an emergency power cutoff switch on the aft inboard side of the captain's and first officer's seat. This switch is located in a position to be accessible to the other pilot.
B. Pilots' Seat Adjustment Controls
(1)
Manual Horizontal Adjustment
(a) Operation of the manual horizontal adjustment control handle, located on inboard side of seat, allows the seat to be manually adjusted fore and aft incrementally along the seat tracks.
(2)
Powered Horizontal Adjustment (Fig. 3)
(3)
Manual Vertical Adjustment
(a) Operation of the manual vertical adjustment control handle, located on outboard side of seat, allows the seat to be manually raised or lowered incrementally.
(4)
Powered Vertical Adjustment (Fig. 3)
(a) Operation of the powered vertical adjustment control switch, located on inboard side of seat, provides 115/200-volt, 400-Hz, 3-phase ac power to an electric motor which operates to raise or lower the seat. Upon release of the power adjustment control switch, the electric motor stops and locks the seat in the desired vertical position.
(5)
Manual Seat Back Recline Adjustment
(a) Operation of the manual seat back recline adjustment control handle, located on outboard side of seat, allows the seat back to be manually adjusted fore and aft incrementally.
(6)
Manual Thigh Support Pad Adjustment
(a) Operation of the manual thigh support pad adjustment control handwheel, located on inboard side of seat, allows the thigh pad to be manually raised or lowered incrementally. Thigh pad support will override to the down position when sufficient pressure is applied and then spring back to the original preset position when pressure is removed.
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