D. Put the Airplane Back to Its Usual Condition
 S 824-010
 (1)
Adjust the control cables for the ram air inlet (Ref 21-52-81/501).

 S 414-009

 (2)  
Install the modulation panel in the ram air inlet
 (Ref 21-52-41/401).

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A

737-300/400/500
MAINTENANCE MANUAL

SEE A
UPPER SUPPORT ARM
ACCESS PANEL
SHAFT ASSEMBLY
LOWER SUPPORTFWD INBD TORSION SPRING
ROD ASSEMBLY  CAM LINK
DEFLECTOR DOOR ARM ASSEMBLY
SHAFT SUPPORT ASSEMBLY
INLET MODULATION PANEL QUADRANT
A

Ram Air Inlet Modulation Shaft Assembly Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 RAM AIR DUCTS - REPAIRS
_______________________
 1.  General_______
 A. This procedure has one task. The task is to repair the ram air duct.
 TASK 21-52-52-348-001
 2.  Ram Air Duct Repair (Fig. 801)___________________
 A. Consumable Materials
 (1)  
B00148 Cleaning solvent, Methyl Ethyl Ketone (MEK), in safety container

 (2)  
Adhesive tape, 1 inch wide, No. 474 Vinyl Plastic Tape, Minnesota Mining & Mfg. Co.

 (3)  
Fiberglass cloth, style 181, Uniglass Industries, Division of United Merchants' and Manufactures, Inc.

 (4)  
Resins, BMS8-301, Class 3 - two part composite structural repair

 (5)  
Abrasive Cloth, 400 grit

 (6)  
Polyvinyl Chloride (PVC) Parting Film, Reynolds Metal Co.

 (7)  
G00033 Cheesecloth, BMS 15-5B, Class A (Woven)

 B. Access
 (1)  Location Zone 212 Left Air Conditioning Equipment Bay 214 Right Air Conditioning Equipment Bay Air Duct 211 Left Ram Air Duct 213 Right Ram Air Duct
 C. Procedure
 S 028-002
 (1)  
Remove the piece of the ram air duct that has the defect.

 S 348-003

 (2)  
Drill the ends of the cracks to make sure the cracks do not become larger.

 S 118-004

 (3)
Clean the damaged area and the adjacent area to the damage.

 (a)  
Apply the solvent, Series 91 (AMM 20-30-91/201) with the specified cloth.

 (b)  
Remove the solvent with the specified cloth before the solvent becomes gas.

 S 348-005
 (4)  Do these steps to prepare the damaged area:
 (a)  
Make the damaged area lightly rough.

 (b)  
Make the damaged area rough one inch more than the area to be repaired.

 (c)  
Clean the rough area with the specified solvent and cloth.

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A

737-300/400/500
MAINTENANCE MANUAL

ACCESS DOOR FOR 
RAM AIR DUCT 
RAM AIR 
DUCT 
EQUIPMENT BAY DOORS 
EXHAUST 
DUCT 
FWD 
TWO PLIES OF THE 
FIBERGLASS CLOTH 
PLIES OF THE 
FIBERGLASS 
CLOTH PATCH 

0.80 INCH 
MINIMUM OF OVERLAP
(EXAMPLE FOR EACH PLY) 
1.00 INCH MINUMUM 
1.00 INCH MINUMUM 
EDGE OF THE 
FIBERGLASS 
CLOTH 
NO. 30 
　
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