25-23-311  Nov 15/71
Page 804
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

PASSENGER SERVICE UNIT - MAINTENANCE PRACTICES
EFFECTIVITY
Carry-All Compartment Interior
1. General
A.  Instructions in this section describe the steps required to lower and raise, also remove and install passenger service unit or spacer panel.
B.  Lowering PSU provides access to equipment installed in the PSU and to electrical air and oxygen connections located at the sidewall.
C.  The same steps are required for each section of a two piece PSU as for a full size unit.
2.  Lower PSU and Spacer Panel (Fig. 201)
A.  Insert small rod or similar tool into hole near each inboard corner of PSU.
NOTE: Care must be taken not to scratch surface of PSU around latch access holes.
B.  Support PSU and push upward with rod to release latch.
C.  Lower PSU until it is supported by lanyard. Lanyard has hooks at intermediate position and at ends.
D.  Push spacer panel outboard to disengage hooks at support beam. Lower spacer panel until supported by lanyard.
NOTE: Spacer panel cannot be lowered until PSU on each side has been lowered.
3.  Raise PSU or Spacer Panel (Fig. 201)
A.  Raise spacer panel, push outboard and release to engage hooks at inboard end on support beam.
B.  Raise PSU until latches on PSU are securely hooked onto carry-al1 compartment beam.
4.  Remove PSU and Spacer Panel (Fig. 201)
A.  Open the following circuit breakers on P18 panel.
(1)  
LEFT READING

(2)  
RIGHT READING

(3)  
NO SMOKING

(4) 
 SEAT BELT

(5)  
PASSENGER AND CREW CALL

B.  Lower PSU and spacer panel to full length of lanyard (Ref par. 2).
C.  Disconnect and cap air oxygen and electrical connections located behind carry-all
compartment.

NOTE:  Oxygen line caps type B and C should be tightened with fingers only to a torque of 7 to 10 pound-inches. Oxygen line caps type A should be tightened to a torque of 120 to 130 pound-inches.
Feb 15/78 25-23-511 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Passenger Service Unit Installation  518 
25-23-511  Figure 201 (Sheet 1)  Feb 15/78 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

518  Passenger Service Unit Installation 
Jan 20/82  Figure 201 (Sheet 2)  25-23-511 
Page 203 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Passenger Service Unit Installation  518 
25-23-511  Figure 201 (Sheet 3)  Nov 15/79 
Page 204 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D.  Remove spacer panels before removing PSU if both are to be removed.
(1)  
Unhook lanyard from hole in carry-all compartment beam.

(2)  
Depress plunger on each outboard support clamp; lift clamp clear of air outlet extrusion and remove spacer panel.

E.  Remove PSU in same manner as spacer panel.
CAUTION:  DO NOT ALLOW PSU TO FALL BEYOND LANYARD LENGTH. PSU MAY BE DAMAGED IN CLAMP AREA.
F.  If PSU is not to be reinstalled, check low-pressure oxygen system to ensure integrity of oxygen system (Ref 35-21-0 A/T).
5.  Install PSU and Spacer Panel (Fig. 201)
A.  Install PSU before installing spacer panels if both have been removed.
(1)  
Support PSU and hook lanyard in hole of carry-all compartment beam.

(2)  
Position PSU, depress plungers on clamps and place clamps on air outlet extrusion. Allow PSU to hang at full length of lanyard.

(3)  
Position forward clamp and engage button in hole in air outlet extrusion. The hole selected must locate PSU so that oxygen mask reference line does not fall forward of aft side of fully-reclined back of seat directly ahead. Oxygen mask reference line is 7.55 inches aft of forward end of PSU.

WARNING:  ALLOWING REFERENCE LINE TO FALL FORWARD OF SEAT BACK AHEAD COULD CAUSE DROPPED MASK TO BE TAKEN BY WRONG PASSENGER, THUS LEAVING A PASSENGER WITHOUT OXYGEN.
NOTE:  It is permissible for oxygen mask to fall slightly forward of oxygen mask reference line (e.g., because of curvature of tubing), provided mask does not touch passenger seated ahead.
B.  Install spacer panel on air outlet extrusion in same manner as PSU.
C.  Raise spacer panel, push outboard and release, to engage hooks at inboard end of support beam.
　
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