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Bleeding
Repair or Replacement

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 12-21.-Landing gear shock strut tools. nut and reinflating the strut, the strut must be dis- assembled and the packings replaced. The tools shown in figure 12-21 are typical of the tools used during disassembly and assembly of landing gear shock struts. Normally, each tool is designed for, and should be used only on, one type of installation. When using wrenches, you must take care to maintain the lugs of the wrenches in their respective positions. Slippage of the wrench, when under torquing conditions, may cause damage to aircraft parts, the tool, or even injury to personnel. NEVER place extension handles of any type on these tools to increase the applied force. These tools, like other special tools, should be kept where they will not be subjected to rough handling, which could cause mushroomed or deformed surfaces, making them useless for aircraft repair. Shock strut disassembly and replacement of packings is a requirement for advancement to first class; therefore, it is not covered in this training manual. INTERMEDIATE MAINTENANCE REPAIR AND SEAL REPLACEMENT Repair of recoil struts at the intermediate level of maintenance is restricted to seal replacement and replacement of parts listed in the “Intermediate Maintenance Section” of the aircraft MIM or the appropriate 03 manual. The following paragraphs provide information on the disassembly, cleaning, inspection, parts replacement, reassembly, and bench testing of a strut at the intermediate level. Disassembly Disassemble the key index numbers strut assembly in the order of the assigned to the exploded view illustration provided in the appropriate 03 series accessories manual or the “Intermediate Maintenance Section” of the applicable MIM. WARNING Before beginning disassembly, make sure that all pressure has been exhausted from the strut. Do not disassemble the inner and outer cylinder until all the pressure has been released from the strut. Disassembly of the strut before releasing all pressure could lead to serious personnel injury or loss of life. Remove the complete air valve assembly by breaking the lockwire and unscrewing the 3/4-inch hex nut. Turn the strut over and drain the hydraulic fluid. Disconnect the torque arms (scissors). Break the lockwire and unscrew the packing nut at the bottom of 12-26







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