(2)
Check that RAM MOD and RAM MOD CONT circuit breakers are closed.
B. With louvers full open, open RAM MOD and RAM MOD CONT circuit breakers and apply warning tags.
C. Open applicable air conditioning bay access door.
D. Remove applicable modulation louver assembly access cover, accessible from wheel well.
4. Repair Exhaust Modulation Louver Assembly
A. Remove louver. (See figure 801.)
(1)
Reaching through open louver, remove cotter pin, nut, and washer from actuating shaft. Remove shaft by moving shaft outward.
(2)
Remove idler shaft by removing cotter pin, nut, and washer, and moving shaft inward.
(3)
Remove louver, checking spacer washers between actuator shaft bearing and louver.
(4)
If required, remove bearing assemblies by pushing bearing inward.
516
Jul 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-52-91 Page 801
Ram Air Exhaust Modulation Louver Assembly 500
21-52-91 Figure 801 Jul 15/70
Page 802
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Install louver. (See figure 801.)
(1)
Install bearing, if removed.
NOTE: Bearings are dry-film lubricated. Do not apply oil or grease on moving surfaces.
(2)
If a new louver is being installed, temporarily position louver between bearings to determine spacer washers required at actuator end to provide equal louver clearance within louver opening.
(3)
Check that bushing is in idler shaft bearing.
(4)
Position spacer washers and louver, align blind splines and install louver shafts.
(5)
Install washer and nut on each shaft. Tighten nuts to 30 pound-inches of torque. Align cotter pin holes by tightening nut as required and install cotter pins.
(6)
Remove bolt at actuator shaft drive arm and check that all louvers move without binding. Install bolt and cotter pin.
5. Restore Airplane to Normal
A. Apply sealant to cover mating surfaces and install modulation louver access cover.
B. Close air conditioning bay access door.
C. Remove warning tags and close applicable circuit breakers.
D. If no longer required, remove electrical power from airplane.
500
Jul 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-52-91 Page 803
RAM AIR DUCTS - APPROVED REPAIRS
1. General
A. Access to the entire ram air duct system is obtained by opening the ram air duct access door and the air conditioning equipment bay doors.
2. Equipment and Materials
A. Solvent - Final Cleaning of All Organic Coatings Prior to Non-structural Bonding
(Ref AMM/SOPM 20-30-89)
B. Adhesive tape, 1 inch wide, No. 474 Vinyl Plastic Tape, Minnesota Mining & Mfg. Co.
C. Fiberglass cloth, style 181, Uniglass Industries, Division of United Merchants' and
Manufactures, Inc.
D. Adhesive, BMS 8-301, Class 3
E. Abrasive Cloth, 400 grit
F. Polyvinyl Chloride (PVC) Parting Film, Reynolds Metal Co.
G. Cheesecloth or other lint-free wiping material containing not more than 0.75 percent (dry weight) oil or grease content.
3. Repair Ram Air Ducts
A. Remove ram air duct within area of failure.
B. Drill ends of cracks to prevent further crack propagation.
C. Clean damaged and adjacent area.
(1)
Apply solvent, Series 89 (Ref AMM-SOPM 20-30-89) with clean, absorbent material.
(2)
Wipe off solvent before it has evaporated with a clean, oil and lint-free, absorbent, disposable material.
(3)
Sand the surface lightly to prepare surface. The sanding should extend one inch beyond repair area. Make a final solvent application and wipe clean as in (2) above.
500
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-52-101 Page 801
NOTE: Use clean rubber or cotton gloves and cheesecloth when cleaning the surfaces.
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