(a)  
RT POWER

(b)  
LFT POWER

(c)  
BRT/DIM CONTROL

C.  Position GROUND SERVICE SWITCH on P13 forward attendants panel to ON.
D.  Position CEILING switch to NIGHT. Verify that all night lights are illuminated and all ceiling lights are off.
E.  Position CEILING switch to DIM. Verify that all ceiling lights are illuminated (dim) and all night lights are off.
F.  Position CEILING switch to BRT. Verify that all ceiling lights change from dim to bright and all night lights are off.
G.  Position GROUND SERVICE switch to OFF. Verify that all ceiling light remain on bright.
H.  Position CEILING switch to OFF. Verify that all night lights and ceiling lights are off.
I.  Position WINDOW switch to DIM. Verify that all window lights are illuminated (dim).
J.  Position WINDOW switch to BRT position. Verify that all window lights change from dim to bright.
K.  Position WINDOW switch to OFF. Verify that all window lights are off.
L.  Remove electrical power if no longer required (Ref 24-20-0, MP).
5C9 
33-21-03 Page 202  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/84 

PASSENGER READING LIGHTS - MAINTENANCE PRACTICES
EFFECTIVITY
Wide Body Look Interior
1.  Light Adjustment (Fig. 201)
A.  General
(1)  Each passenger service unit contains three reading lights. The two inboard reading lights are adjustable laterally to accommodate variations in seat arrangements. The outboard reading light is not used when a two-seat group of seats is installed. Detent positions on light adjustment provide a positive means of adjustment to satisfy any seat arrangement.
B.  Adjust Reading Lights
(1)  
Release two quick-release fasteners near each inboard corner of PSU or insert small rod (or similar device) in each inboard corner and push to release latches, as applicable (use care not to mar PSU surface), and lower PSU until lanyard is taut.

(2)  
Loosen adjustment nut and move locating spring to correct detent position.

(3)  
Tighten adjustment nut.

(4)  
Raise PSU and secure fasteners or check that latches are engaged, as applicable.

2.  Relamp Light (Fig. 201)
A.  Release two quick-release fasteners near each inboard corner of PSU or insert small rod (or similar device) in each inboard corner and push to release latches, as applicable (use care not to mar PSU surface), and lower PSU until lanyard is taut.
B.  Release two spring clips and pull lamp housing assembly upward.
C.  Relamp.
Nov 15/78 33-21-12 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Passenger Reading Lights Installation  527 
33-21-12  Figure 201  Aug 01/74 
Page 202 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

D. Press lamp housing firmly in place. Check that spring clips are seated in indents.
E. Raise PSU and secure fasteners or check that latches are engaged, as applicable.
3. Test Light
A. Provide electrical power.
B. Check that applicable reading light circuit breakers on P18 panel are closed.
C. Press each of the reading light switches on PSU and check that reading lights come on.
D. Press switches and check that reading lights go off.
E. Remove electrical power if no longer required.
527 
Aug 01/74  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  33-21-12 Page 203 

PASSENGER READING LIGHT – MAINTENANCE PRACTICES
EFFECTIVITY
Carry-All Compartment Interior
1.  Passenger Reading Lights Adjustment
A.  General
(1)  Each passenger service unit contains three reading lights. Each light is positioned with an adjustment at the top of the light fixture. This adjustment is made with the PSU in the lowered position. A light adjustment is required whenever a seat is moved on the seat track, unless the passenger service unit is moved by the same amount in the same direction. Nominal position of the passenger service unit is such that its aft edge is 5.0 inches forward of the intersection point between seat back and seat cushion (seat datum). In this position the reading light should be adjusted to the No. 3 index mark for Fwd/Aft Adjustment (Fig. 201). For each 2 inches of difference from the 5-inch nominal dimension, the reading light should be adjusted one index mark forward of aft (e.g., if the distance from seat datum to aft edge of PSU is 3.0 inches, the light should be adjusted to index mark No. 4). Maximum adjustment provides + 4 inches movement of the light at the reading plane. The PSU may also be located an additional 4 inches aft relative to the seat (aft edge of PSU 3 inches AFT of seat datum), and an acceptable lighting pattern is obtained with the reading light adjusted to index mark No. 5. Lateral adjustment of the light is accomplished in a similar manner, the index marks indicating position for left- and right-hand side triple (6L or 6R) and double (4L or 4R) seats.
　
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