B. Access
 (1)  Location Zone
 200 Upper Half of Fuselage

 C. References
 (1)  35-21-04/201 Oxygen Generator
 D. Procedure
 S 864-001
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11P9, PASS SIGN CONT

 (b)  
11N8, PASS CALL LEFT

 (c)  
11N9, PASS CALL RIGHT

 (d)  
11A21, PASSENGER OXYGEN LEFT

 (e)  
11A23, PASSENGER OXYGEN RIGHT

 (f)  
11A24, PASSENGER OXYGEN CONT

 (g)  
11A25, PASSENGER OXYGEN MANUAL DEPLOY

 (h)  
11C22, PASS ADRS AMPL or PASS ADRS

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MAINTENANCE MANUAL

LATCH RELEASE
OVERHEAD ACCESS HOLES
STOWAGE BIN
PUSH HERE
(PSU LATCH) TO CLOSEAIR CONDITIONING SEE A PSU SUPPORT
EXTRUSION STRUCTURE
BB A
A CC
SPACER PANEL
SCREWS
AIR CONDITIONING
EXTRUSION PSU SUPPORT STRUCTURE
PUSH HERE TO RELEASE OUTBOARD PSU
PSU PUSH HERE
LANYARD (RELEASED TO RELEASE
POSITION)  INBOARD PSU
PSU SCREWS A-A PSU LATCH
A
LIFE VEST
LIFE VEST
ENVELOPE

ENVELOPE
COMPARTMENT 0.81

INCH
0.79
LATCH BARHINGE LATCH STIFFENERLIFE VEST
ASSEMBLY
ACCESS DOOR
LIFE VEST ACCESS DOOR B-B
PSU
Figure 401 (Sheet 1)

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MAINTENANCE MANUAL

TERMINATION OR TRANSITION SPACER PANEL (EXAMPLE)
C-C

PSU
Figure 401 (Sheet 2)

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MAINTENANCE MANUAL

 S 864-002
 (2)  Open these circuit breakers on the miscellaneous relay panel, P70, and attach DO-NOT-CLOSE tags: (a) 70B18, LEFT PASS READING LTS FWD (b) 70B19, LEFT PASS READING LTS AFT (c) 70B20, LEFT PASS READING LTS MID FWD (d) 70B21, LEFT PASS READING LTS MID AFT
 S 864-013
 (3)  Open these circuit breakers on the right miscellaneous electrical equipment panel, P37, and attach DO-NOT-CLOSE tags: (a) 37H1, PASS READING LIGHTS FWD or PASS READING LIGHTS RIGHT FWD
 (b)  37H2,  PASS READING LIGHTS AFT or PASS READING LIGHTS RIGHT AFT
 (c)  37H3,  PASS READING LIGHTS MID FWD or PASS READING LIGHTS R MID FWD
 (d)  37H4,  PASS READING LIGHTS MID AFT or PASS READING LIGHTS R MID AFT
 S 024-086
 (4)  Put the latch release rod in the latch release access holes (2 locations) to release the latches.
 S 024-087
 (5)  Release the lanyard to lower the PSU.
 S 044-110
 (6)  Deactivate the Oxygen Generator (AMM 35-21-04/201).
 S 024-089
 (7)  Disconnect the electrical connector.
 S 024-090
 (8)  GUN 004-999; Do the steps that follow: (a) Disconnect the oxygen supply hose from the PSU manifold fitting. (b) Seal the oxygen supply hose and the PSU manifold fitting with a cap.
 S 024-018
 (9)  Hold the PSU and disconnect the lanyard from the PSU support structure.

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