FORWARD LAVATORY SERVICE UNIT - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes Without ATI Interior
1. General
A. One oxygen box, containing two oxygen masks, and an overhead service light are attached to the upper side of the triangular-shaped ceiling panel of the forward lavatory compartment. These facilities comprise the forward lavatory service unit. Removal of the service unit is accomplished by removing the triangular-shaped service unit panel.
2. Remove Forward Lavatory Service Unit
A. Open lavatory dome light circuit breaker on circuit breaker panel P18-3.
B. Remove snap-in plug buttons along aft and inboard edges of service unit panel to expose attachment screws (Fig. 401).
C. Remove attachment screws securing aft and inboard edges of panel.
D. Push upward on outboard edge of service unit panel and pull down on trim strip to release velcro tape.
E. Partially lower service unit panel, reach above panel and disconnect oxygen line and electrical leads.
F. Completely remove service unit panel.
3. Install Forward Lavatory Service Unit
A. Raise service unit panel and connect oxygen line and electrical leads (Fig. 401).
B. Insert outboard edge of panel above trim strip and lower outboard edge to trim strip engaging velcro tape.
C. Install attachment screws along aft and inboard edges of panel.
D. Install snap-in plug buttons to conceal attachment screws.
E. Check low pressure oxygen system for open connections and leakage (Ref Chapter 35, Passenger Oxygen System).
F. Close lavatory dome light circuit breaker on circuit breaker panel P18-3.
5C8
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Forward Lavatory Service Unit Installation 502
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FORWARD LAVATORY OXYGEN SERVICE UNIT - REMOVAL/INSTALLATION
EFFECTIVITY
Passenger/Cargo Convertible Airplanes
1. Remove Forward Lavatory Service Unit (Fig. 401)
A. Operate manual release pin to open service unit door. Oxygen masks will drop from service unit.
B. Disconnect oxygen line at service unit. Place dust cap or cover on oxygen line to prevent contamination.
C. Remove screws attaching oxygen mask box to lavatory wall and remove service unit.
2. Install Forward Lavatory Service Unit (Fig. 401)
A. Place forward lavatory service unit in mounting position with door open.
B. Install screws securing oxygen mask box to lavatory wall.
C. Place oxygen masks in oxygen mask box and close service unit door.
D. Remove dust cap or cover from oxygen line and connect oxygen line at service unit.
E. Check low pressure oxygen system for open connections and leakage (Ref Chapter 35, Passenger Oxygen System).
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Forward Lavatory Service Unit Installation 511
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AFT LAVATORY SERVICE UNITS - REMOVAL/INSTALLATION
EFFECTIVITY
ALL EXCEPT ATI INTERIOR
1. Remove Lavatory Service Unit (Fig. 401)
A. Open passenger address amplifier circuit breaker on P6 circuit breaker panel.
B. Operate manual release pin to open service unit door. Oxygen masks wil1 drop from service unit.
C. Remove screws along perimeter of service unit base attaching unit to mounting plate and partially lower service unit through cutout in ceiling panel.
D. Reach above service unit through cutout in lavatory ceiling panel and disconnect oxygen hose and electrical leads at unit terminal box.
E. Lower service unit clear of ceiling panel.
2. Install Lavatory Service Unit (Fig. 401)
A. Hold service unit up to cutout in lavatory ceiling panel.
B. Reach above service unit through cutout in lavatory ceiling panel and connect oxygen hose and electrical leads at terminal box.
C. Completely raise service unit up to mounting plate and install screws along perimeter of service unit base attaching unit to mounting plate.
D. Raise oxygen masks into service unit and close service unit door.
E. Close passenger address amplifier circuit breaker on P6 circuit breaker panel.
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