4.29 PARKING BRAKE VALVE COMPONENTS (PT)

Figure 4-28. Main Landing Gear Brake Housing

TM-1-1520-265-23 H-60 Helicopter Series Manual
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TM 1-1520-265-23 Change 2 4-69 4.29 PARKING BRAKE VALVE COMPONENTS (PT). 4.29.1 Description (Figure 4-1, Index No. 29) . The parking brake valve traps fluid pressure to the brakes to prevent helicopter movement. This inspection pertains to the components contained within the parking valve body. 4.29.2 Defects. This inspection is used to verify crack indications found visually on the parking brake valve components. No cracks are allowed. 4.29.3 Primary Method . Fluorescent Penetrant. 4.29.3.1 NDI Equipment and Materials. (Refer to Appendix B.) Inspection equipment is listed in Table 1-7. AMS 2644 level 3 penetrant materials shall be selected from the approved list in Table 1-8. Parts requiring flourescent penetrant inspection shall be cleaned prior to inspection with n--Propyl Bromide (vapor degreasing only)(Table 1--8), DS--108 (Table 1--8), Electron (Table 1--8), Positron (Table 1--8). DS--108, Electron, Positron must be followed by an acetone (Table 1--8) rinse or wipe: or drying until there is no visible solvent residue left on parts. 4.29.3.2 Preparation of Helicopter. The helicopter shall be prepared for safe ground maintenance and the parking valve removed and disassembled in accordance with the applicable technical manuals listed in Table 1-1. 4.29.3.3 Access. Not applicable. 4.29.3.4 Preparation of Part. Refer to Preparation of Part or Area for NDI, paragraph 1.4.4. 4.29.3.5 Inspection Procedure. Perform fluorescent penetrant inspection. Refer to Fluorescent Penetrant Method, paragraph 1.4.7 and Table 1-5. Inspect area of concern. See Figure 4-29. Figure 4-29. Parking Brake Valve Components

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