MIL-J-26149E
* 3.12 Jack pad socket. All jacks shall be provided with a jack
pad socket. For those jacks mating with an adapter having a radius of 0.5 in
(12.7MM) or 0175 in (19.1MM). The jack pad socket shall conform to drawing
5686129. for those mating with the larger adapter (radius 1.245in (31.SMM). The design of the jack pad socket shall be as established by the produring agency. Such jack pad sockets may be integral to the screw extension. The jacking point adapter, MS33559 which is on the aircraft, interfaces with the socket on the jack.
3.13 Jack assembly. The jack assembly shall be compact to provide rapid and easy emplacement for prompt operation. Its controls shall be spaced and grouped-in a logical arrangement to provide ease of control of all operations and positive functions. Any external connections shall readily provide maximum flexibility when used with other jacks or an external pumping source.
* 3.13.1 Supporting structure. For those jacks requiring a tripod structure, a rigid symmetrical tripod structure shall support the ram and cylinder assembly. The structure shall provide the complete jack with stability and safety under all combinations of load and extended height conditions. The minimum clear space to be provides under aircraft main jacking pads (adapters), to accommodate tripod jacks, shall be in the form of a truncated right pyramid having an equilateral triangular base and limiting edges at 30°C to the vertical axis. The height of the pyramid shall be sufficient to reach the jack pad (adapter) at the maximum aircraft height
before jacking. The dimensions of the truncated top of the pyramid shall meet the dimensions of the inscribed circle given in table II. In addition, to assure adequate jack stability, the base of the pyramid must have a minimum
leg radius from the vertical centerline of 0.3 times the maximum extended jack height. when the jack pad (adapter) is imbedded within the surface of the
aircraft structure, this pyramid will have an additional clear space In the shape of a cylinder on top of the pyramid and on the vertical centerline of
the pyramid. This cylinder shall be such as to meet the space requirements of
the appropriate main jacking pad (adapter) configuration. These requirements are illustrated in figure 2.
3.13.2 L egs.
The jack legs as required shall be designed as primary
axial load carrying members and shall be fabricated of hollow, tubular construction. The upper end of each leg shall so attach to the upper end of
the cylinder “assembly as to transfer the total vertical load of the ram/cylinder assemby to the legs. The lower end of each leg shall be
laterally stabilized by horizontal bracing between each leg and lower end of
the ram/cylinder assembly. 8races shall also be used as necessary or brace interconnect adjacent pair of legs. The foot of each leg or brace (hollow
type) shall be provided with a suitable drain hole.
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