Quantcast AIRCRAFT TRIPOD JACKS

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system, and associated sensing and control components. The trailer has towing and steering capabilities and its own braking system. A collapsible air ducting hose connects to the aircraft and provides conditioned air. A/M32C-21 AIR CONDITIONER.—The A/M32C-21 air-conditioner (fig. 9-27) is a mobile, four-wheel, trailer-mounted, electrically powered, self-contained unit powered by a 30-horsepower, 440-volt, 3-phase, 60-hertz ac electric motor that is an integral part of the six-cylinder reciprocating type compressor. A 30- to 50-foot external power cable, a 30-foot collapsible duct hose for aircraft connection, a collapsible tow bar for towing and steering, tie-down rings, and a manual parking brake are provided. Hydraulic Jacks Hydraulic jacks are frequently used in aircraft maintenance. Maintenance of the tires, wheels, brakes, and struts requires part or all of the aircraft to be lifted off the deck. The entire aircraft must be lifted off the deck to perform operational testing of the landing gear. Different types and sizes of hydraulic jacks are needed. Some typical hydraulic jacks are described in the following paragraphs. The basic types are illustrated in figure 9-28. AIRCRAFT AXLE JACKS.—The aircraft axle jack (fig. 9-28, view A) is a portable, self-contained, hydraulically operated unit. These jacks are used to raise the landing gear wheels off the deck to perform maintenance operations. The lift, a component of the base of the jacks, consists of three rams and an outer cylinder. A rectangular tank welded to the base forms the fluid reservoir. AIRCRAFT TRIPOD JACKS.—The aircraft tripod  jack  (fig.  9-28,  view  B)  is  a  portable, self-contained, hydraulically operated jack. These jacks are used for raising the wing, nose, or tail of an aircraft. When used in sufficient numbers and at the required jacking points, this jack can lift the complete aircraft off the deck. The jack consists of three main assemblies—a hydraulic cylinder, a tubular steel tripod leg structure with caster wheels, and a hydraulic pump assembly. The cylinder and ram are raised by manually operating the hydraulic pump. Maintenance Platforms Performing maintenance on aircraft does not always occur at ground level and often requires the use of a maintenance platform. There are several different models to use depending on type of aircraft, the maintenance requirement, and location. Two common maintenance  platforms  are  the  B-2  maintenance platform and the B-4 maintenance platform. B-2 MAINTENANCE PLATFORM.—The B-2 maintenance platform (fig. 9-29) is a fixed height, 9-17 ANF0929 HYDRAULIC CYLINDER BARREL LOCK BARREL GROOVES HYDRAULIC RESERVOIR TOWBAR JACKSCREW HYDRAULIC PUMPS HYDRAULIC LINES Figure 9-29.—B-2 maintenance platform.



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