21-52-91
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
ACCESS DOOR TO RAM AIR DUCT LOUVER ASSEMBLY
SEE A
DUCT  WHEEL WELL WEB
A
ARM
ACCESS DOOR TO
AIR CONDITIONING
BAY COVER

BOLT (11 LOCATIONS)
INBD
FWD
A
LOUVER ASSEMBLY PIN HOLE FOR RIGGING PIN(1/4-INCH DIAMETER)
LOUVER ASSEMBLY
A
IDLERSPACER WASHERS SHAFT
NUT
BUSHING
WASHER
SPRING KEEPER
COTTER PIN
ACTUATOR SHAFT NUT
BEARING ASSEMBLY
LOUVER ASSEMBLY COTTER PIN EXHAUST LOUVER
A-A
Ram Air Exhaust Modulation Louver Assembly Figure 801
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH RAM AIR EXHAUST LOUVERS ú

 21-52-91
 (PRE-SB 21-1123)  ú ú 01 Page 802 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 868-006
 (5)  Open these circuit breakers on the P6 panel and attach DO-NOT-CLOSE
 tags:
 (a) L RAM MOD
 (b) R RAM MOD
 (c) RAM MOD CONT
 S 018-007
 (6)  Open the access door to the air conditioning bay.
 S 018-008
 (7)  Remove the access cover from the louver assembly.
 S 028-009
 (8)  Remove the damaged components of the louver assembly:
 (a) Remove the cotter pin, nut, and washer from the actuator shaft
 and the idler shaft.
 (b) Remove the actuator shaft and the idler shaft.
 (c) Remove the louver and the spacer washers.
 NOTE: The spacer washers are adjacent to the actuator shaft____
 bearing.
 (d) Remove the bearing assemblies on each side of the louver
 assembly.
 S 428-010
 (9)  Install the new components of the louver assembly:
 (a) Install the bearing assemblies.
 (b) Apply a dry-film lubricant to the bearing assemblies.
 NOTE: Do not apply oil or grease to the bearing assemblies.____
 (c) Make sure the bearing assembly at the idler shaft has a bushing
 in it.
 (d) Hold the louver in its position between the bearing assemblies.
 (e) Install the spacer washers between the actuator shaft bearing
 and the louver.
 (f) Install the actuator shaft and the idler shaft through the
 louver.
 (g) Install a washer and nut on the actuator shaft and the idler
 shaft.
 (h) Tighten the nuts to 30 pound-inches.
 (i) Install a cotter pin on the actuator shaft and the idler shaft.
 S 218-011

 (10) Make sure the louvers move freely:
 (a)  
Remove the bolt and cotter pin at the arm of the actuator shaft.

 (b)  
Move the arm and make sure the louvers move freely.

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 21-52-91
 (PRE-SB 21-1123)  ú ú 01 Page 803 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (c) Install the bolt and cotter pin.
 S 398-012
 (11)
 Apply the sealant to the access cover for the louver assembly.

 S 418-013

 (12)
 Install the access cover.

 S 418-014

 (13)
 Close the access door to the air conditioning bay.

 S 868-015

 (14)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:

 (a)
L RAM MOD

 (b)
R RAM MOD

 (c)
RAM MOD CONT

 S 868-016
 (15) Remove the electrical power if it is not necessary (Ref 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH RAM AIR EXHAUST LOUVERS ú
　
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