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AIRCRAFT JACKING
Airframe (Tripod) Jacks

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Figure 3-27.—Types of axle jacks. wheels, and struts. There are four different types of axle jacks and many different sizes (lifting capacity in tons). Figure 3-27 shows the four types of Navy axle jacks. The smaller hydraulic axle jacks are normally squadron or unit permanent custody equipment. That means your outfit is responsible for making sure the jacks are load tested at the support equipment (SE) division of the aircraft intermediate maintenance department (AIMD) before being put into service, and annuall y thereafter. Special inspections include 13 week inspections at AIMD S/E, but a load test is not required every 13 weeks. A record of maintenance, inspections, technical directives, and load testing is kept on OPNAV form 4790/51 All model designations for axle jacks begin with the letter A, for axle, such as A 10-1HC. The number following the A shows the jack capacit y in tons, such as 10 for a 10-ton jack. This is followed by a dash (-) and the specific jack identification number. Then comes two letters that show the type of jack (HC = hand carried, HS = horseshoe, TB = T-bar, and OR = outrigger). HAND CARRIED.—These axle jacks are portable, self-contained units, with single or double manually operated pumps. They have carrying handles, pump handles, reservoir vent valves, release valves, and safety valves. The different model sizes vary from 4 3/4 inches to 9 inches high (closed). Their weights vary from 26 to 120 pounds. 3-38







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