IL-J-26149E
3.6.8 Structural design. The jack ram and cylinder shall be designed to include a factor of safety of 1.75 based on the rated capacity of the jack. The remainder of the jack-supporting structure shall be designed for a factor
of safety of 2.0 based on the rated capacity of the jack (see 6.7.8).
3.7 a.
b.
c. d.
e.
h.
m.
Performance. The jack shall operate under the following conditions:
An internal pressure equal to 1-1/2 times the pressure at rated capacity without leakage.
Maximum settling of 0.020 inch (0.51 mm) per ram per hour under rated capacity load.
Raising vertically 150 percent of the rated capacity load. Withstanding a horizontal load equal to 15 percent of rated capacity
while supporting a rated capacity load with the ram fully extended
and the screw extension retracted.
Operating at all termperatures ranging from -65°F to +130°F (-53 9°c to 54.4°C).
Two hundred cycles of raising a rated capacity load and sixty cycles of raising a rated capacity load while being subjected to a horizontal load of 15 percent of rated capacity.
Dust particles as encountered in desert areas. Exposure to salt fog or salt laden atmosphere.
Operating in rain, snow, or bright sunlight.
Interface properly and securely with the aircraft jack points. The hydraulic fluid system shall have overload protection
capabilities.
3.8 Hydraulic system. The hydraulic system (figure 1) shall be designed for operation with hydraulic fluid conforming to MIL-H-5606, MIL-H-83282, or MIL-H-81019 and shall consist of a jack ram and cylinder, pump, necessary bypass and check valves, reservoir, tubing, hose and fittings. The hydraulic system shall be provided with a device designed and located to bleed all entrapped air from the system. The jack shall be equipped with a self- contained, hand operated, hydraulic pumping system and shall also have provisions for connection to an external hydraulic pumping source when specified. Hydraulic hose shall conform to MS28759 and the hose shall have a female connector 43A13905 which will mate with the connector on the jack. The external leakage of the system shall not exceed 0.05 cc per hour at any
pressure. For design purposes the optimum hydraulic pressure shall be 3000 psi
*(20,684 kPa) at the rated capacity.
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