(b)
Disengage the lock housing
(c)
Turn the housing to get the necessary recline range
(d)
Engage the housing to set the recline range.
C. Adjust the Seat Back Breakover
S 822-044
(1) Tighten or loosen the friction bolt to adjust the seat back.
NOTE: The seat back must break forward with 25-30 pounds force
____
applied at the top of the seat back.
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A
737-300/400/500MAINTENANCE MANUAL
SERVICE UNITS - DESCRIPTION AND OPERATION
_________________________________________
1. General_______
A. Service units are installed for passengers and attendants. Passenger service units (PSU's) are above each row of seats. Attendant service units (ASU's) are at each attendant seat. Lavatory service units (LSU's) are in each lavatory.
B. A chemical oxygen generator installed in each unit supplies the emergency oxygen.
2. Passenger Service Units (PSU's) (Fig. 1)_______________________________
A. PSU's above the seats have reading lights, gasper air outlets, emergency oxygen equipment, NO SMOKING FASTEN SEAT BELT (NSFSB) signs, and attendant call switches. Alternate units have a speaker.
B. The PSU's have inboard and outboard support rails; are hinged on the outboard side and latched on the inboard side. Small holes in the PSU face panels give access for releasing the latches. A lanyard limits movement as the unit swings open.
3. Attendant Service Units (ASU's)_______________________________
A. Attendant Service Units are in lowered ceiling panels at entryways. ASU's have emergency oxygen equipment.
4. Lavatory Service Units (LSU's)______________________________
A. Lavatories have emergency oxygen, passenger advisory lights and speakers. LSU's contain emergency oxygen only, and are ceiling-mounted; other service devices are separately mounted.
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25-23-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PASSENGER SERVICE UNIT (EXAMPLE) RELEASE POINT
A
1 INSTALLED ON ALTERNATE UNITS
Passenger Service Unit Figure 1
E04334
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25-23-00
ALL ú ú 01 Page 2 ú Mar 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
ATTENDANT AND LAVATORY SERVICE UNITS (ASUs AND LSUs) - REMOVAL/INSTALLATION
___________________________________________________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The removal of the Attendant and Lavatory Service Units (ASUs and LSUs)
(2)
The installation of the Attendant and Lavatory Service Units (ASUs and LSUs)
B. The attendant and lavatory service units (ASUs and LSUs) contain an emergency oxygen masks and generator, and are usually identified as an oxygen box. You can remove the oxygen masks and generator with the unit installed (Ref 35-22-11/201, 35-22-31/401).
TASK 25-23-13-004-013
2. ASUs or LSUs Removal (Fig. 401)_______________________________
A. References
(1) AMM 35-22-11/201
B. Access
(1) Location Zones
100 Upper Half of Fuselage
C. Prepare to Remove the ASU's or the LSU's
S 864-011
(1) Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(a) P18 Load Control Center
1) P18-3 OXYGEN SYSTEM PASS R
2) P18-3 OXYGEN SYSTEM PASS L
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