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20-00-02/70-00-01
SECTION IV – REPAIR
1. Standard Repair Practices
A. General
The methods and procedures presented are recommended by the manufacturer to facilitate overhaul and repair of a unit. The information is presented as a supplement to the knowledge acquired by competent personnel engaged in the overhaul activities of organized facilities.
Typical examples used in this section do not replace specific instructions provided in applicable manuals.
Plating processes and applicable specifications are listed in Table 401.
No repair of bearings is authorized. Bearings that do not meet visual and/or dimensional check requirements, specified in SECTION III, shall be rejected.
Use of standard oversize inserts in locations where inserts or tapped hole threads are damaged or loose is acceptable, provided a 0.050 inch (1,27 mm) minimum wall thickness is maintained.
Stop-drilling is not considered a standard repair practice as the process details will vary from part to part, but the use of stop-drilling is permitted where/as indicated by the specific part coverage in the applicable IRM, WPG, or Engine Manual.
Table 401. Plating Processes and Applicable Specifications
Process Specification and Method
Anodic Treatment for Magnesium Federal Specification AMS AMS 4375, AMS 4376, AMS 4377, AMS 2476 or MIL-M-45202
Black Oxide on Steel MIL-C-13924, Class 1, SAE 1020 or 4130, or AMS2485
Cadmium Plate Federal Specification QQ-P-416, Type I and II, SAE 1020 or 4130, or AMS2400
Chemical Conversion Coating MIL-C-5541, Class 1A, 2024-T3
Chromic Anodize MIL-A-8625, Type I, Class 1, 2024-T3, or AMS2470
Chromium Plate Federal Specification QQ-C-320, Class 2, SAE 1020, 4130 or 6250, or AMS2406
Copper Plate MIL-C-14550, or SAE 1020 or 4130
Electrolyses Nickel SAE 1020 or 4130, or AMS2404, AMS 2405, or AMS 2433
Hard Anodize MIL-A-8625, Type III, 2024 and 6061, or AMS2469
Plasma Spray AMS2437
Shot Peening MIL-S-13165 or AMS2430
Silver Plate Federal Specification QQ-S-365, Type I, II and III, Grade B, SAE 1020 or 4130, or AMS2410 to AMS2412
Surface Treatment of Magnesium MIL-M-3171, Type III
Repair
Page 401 Apr 1/05 Copying, use or disclosure of information on this page is subject to proprietary restrictions.
20-00-02/70-00-01
2. Preparation of Solutions
WARNING: SOLUTIONS USED FOR CLEANING ARE HAZARDOUS. AVOID INHALING FUMES, DUST, OR MIST. AVOID CONTACT WITH SKIN. AFTER PREPARATION, WASH HANDS AND FACE THOROUGHLY.
A. Method No. 402A: Alkaline Cleaning Solutions Mixing Instructions
WARNING: USE CORRECT PERSONAL PROTECTION. ALKALINE CLEANING SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES OR MIST. AVOID CONTACT WITH SKIN. AFTER USE, WASH HANDS AND FACE THOROUGHLY.
Prepare alkaline cleaner solution as follows:
(1)
Dissolve four to six ounces of alkaline cleaner (Diversey 909) (SECTION VII) in each gallon (93,78 L) of distilled or de-ionized water used.
(2)
Maintain solution at 130 to 180F (54 to 82C) in an air agitated tank.
B. Method No. 402B: Anodize Stripper Mixing Instructions
WARNING: USE CORRECT PERSONAL PROTECTION. ANODIZE STRIPPER SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES OR MIST. AVOID CONTACT WITH SKIN. AFTER USE, WASH HANDS AND FACE THOROUGHLY.
Prepare anodize stripper solution as follows:
(1)
Dissolve one pound of anodize stripper (SECTION VII) in each gallon (93,78 L) of distilled or de-ionized water used.
(2)
Maintain solution at 180 to 190F (82 to 88C) in an air agitated tank.
C. Method No. 402C: De-oxidizer Mixing Instructions
WARNING: USE CORRECT PERSONAL PROTECTION. DE-OXIDIZER SOLUTIONS ARE HAZARDOUS. AVOID INHALING FUMES OR MIST. AVOID CONTACT WITH SKIN. AFTER USE, WASH HANDS AND FACE THOROUGHLY.
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