Aft Lavatory Service Unit Installation 502
25-23-41 Figure 401 Nov 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FORWARD CABIN ATTENDANTS' SERVICE UNIT - REMOVAL/INSTALLATION
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. General
A. The forward attendants' oxygen service unit, a work light, and an exit light are mounted on a service panel over the forward entry door. Removal of the service unit is accomplished by removing the service panel.
2. Remove Forward Cabin Attendants' Service Unit (Fig. 401).
A. Open exit and entry light circuit breakers on circuit breaker panel P18.
B. Disconnect quick-release fasteners securing service panel in closed position and allow it to swing down to open position where it is held by lanyard.
C. Disconnect electrical wiring from entry and exit lights.
D. Disconnect oxygen line and place dust cap or cover over line to prevent contamination.
E. Support service panel and disconnect lanyard.
F. Remove nut, bolt and washers securing hinges to their support brackets and remove service panel. Reinstall attaching hardware in bracket to prevent loss of small parts.
3. Install Forward Cabin Attendants' Service Unit (Fig. 401).
A. Place service panel in position and install nut, bolt and washers securing hinges to their support brackets.
B. Support service panel and connect lanyard.
C. Remove dust cover or cap from oxygen line and connect oxygen line.
D. Connect electrical leads to entry and exit lights.
E. Raise panel to closed position and secure in place with quick-disconnect fasteners.
F. Close circuit breakers. Check exit and entry light for proper operation.
G. Check low pressure oxygen system for open connections and leakage (Ref Chapter 35, Passenger Oxygen System).
Feb 20/85 25-23-61 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Forward Cabin Attendants' Service Unit Installation 501
25-23-61Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/68
AFT CABIN ATTENDANTS' SERVICE UNIT - REMOVAL/INSTALLATION
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. Remove Aft Attendants' Service Unit (Fig. 401).
A. Open aft lowered ceiling access door.
B. Disconnect oxygen line to service unit. Place dust cap or cover on oxygen line to prevent contamination.
C. Operate manual release pin to open service unit door. Oxygen masks will drop from service unit.
D. Remove screws along perimeter of service unit base attaching unit to mounting plate, and lower service unit through cutout in ceiling panel.
2. Install Aft Attendants' Service Unit (Fig. 401).
A. Raise aft attendants' service unit through cutout in aft lowered ceiling panel and position unit base against mounting plate.
B. Install screws attaching base of service unit to mounting plate.
C. Raise oxygen masks into service unit and close service unit door.
D. Reach through aft lowered ceiling access door opening, remove dust cap or cover, and connect oxygen line to service unit.
E. Close aft lowered ceiling access door.
F. Check low pressure oxygen system for open connections and leakage (Ref Chapter 35, Passenger Oxygen System).
Feb 20/85 25-23-71 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Cabin Attendants' Service Unit Installation 502
25-23-71Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/68
ATTENDANT AND LAVATORY SERVICE UNITS (ASU'S AND LSU'S) -REMOVAL/INSTALLATION
EFFECTIVITY
ATI INTERIOR
1. General
A. ASU's and LSU's contain emergency oxygen only, and are the type of unit commonly called an oxygen box.
B. This procedure removes the ASU or LSU housing; however, oxygen masks and generator are easily serviced or removed without disturbing the housing (Ref 35-22-11 and 35-22-31, M/P and R/I).
2. Prepare to remove ASU or LSU
WARNING: ASU OR LSU ASSEMBLY INCLUDES AN OXYGEN GENERATOR, WHICH IS A PYROTECHNIC-ACTIVATED UNIT. IF RELEASE PIN IS PULLED AND GENERATOR FIRES, GENERATOR SURFACE MAY EXCEED 4500F AND CAUSE SERIOUS BURNS. ALLOW TO COOL BEFORE HANDLING.
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