MIL-J-26149 Jack, Hydraulic, Aircraft Maintenance, General Specification ForThis specification covers the general requirements for weapon systems hydraulic jacks as used with all types of military aircraft.

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MIL-J-26149E

3.6.1.1  Component  selection.   All components shall be new and shall have proper clearances and adjustments.   They shall so work together that the jack will supply the rated capacity.

3.6.1.2  Component  maintenance.   All components shall be selected on the basis of maximum life cycle with a minimum of maintenance. Selection shall be made primarily from approved standard parts using the best engineering practices.   Whenever possible extended life parts shall be utilized. As required by the contract the parts control program shall be in accordance with MIL-STD-965.

3.6.2 R eliability.

The jack shall have a mean-time-between-failures

(MTBF) of not less than 108 cycles with a reliability of not less than 0.9908 for a l-cycle mission at 0.9 confidence (see 6.7.4).

3.6.3  M aintainability

The jack shall be designed and constructed as

specified herein and to provide the following:

a.        Minimum number of parts consistent with reliability and performance specified herein.

b.        Minimum amount of training and time necessary for assembly, disassembly,                location  of  trouble  sources,  and maintenance including servicing.        Where  practical,  parts and components shall be located or positioned for rapid and simple inspection and recognition of excessive wear or potential failure.

c.        Permit  adjustments,  servicing, replacement of parts and components, and other maintenance with minimum disturbance to other equipment parts or components.   Parts and components shall be located for ample and rapid access unless performance or reliability will be appreciably degraded by the accessible location.   In  performing maintenance,        if engineering reasoning or data determines that

physical or visual Interference between items cannot be avoided, the item predicted to require the most maintenance shall be located for best accessibility and ease of maintenance.

d.        Permit maintenance with general purpose tools and equipment normally available        commercially.   Use of special purpose tools and equipment shall be subject to approval by the procuring activity.

e.        Minimum number of tools required for maintenance by design practices such as reducing the variety of bolt head sizes to the practicable minimum.

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