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MIL-S-8959(ASG)
3.3.3.2 Commercial parts. - Commercial utility parts, such as screws, bolts,
nuts$ and cotter pins may be used, provided they possess suitable properties and are
.
...
replaceable by the MS or AN parts without alteration, and provided the correspon
MS or AN part numbers are referenced in the parts list and, if practicable, on the
contractor's drawings.
3.4 Design and c obstruction .-
3.4.1 Filling and charging. - Filling of hydraulic springs may be by disassembly
of the unit or through a filling port.  If pressure charging is accomplished by pump-
ing, the pump-attaching port shall conform dimensionally to MS33656-2. The pressure-
charging port shall be located so that charging can be accomplished while the unit is
installed.
3.4.2 Bleeding. - If pressure charging is used, a bleed port shall be provided
and shall be so located that bleeding can be accomplished while the unit is installed.
3.4.3 Spring hysteresis.- When used solely as an energy-storing device, the
minimum unloading cycle load-stroke curve shall be defined by the procuring activity.
The cycling rate shall be 1 inch per second, unless otherwise specified by the design
requirements.
3.4.4 Piston rod plating.- Where piston rods are chromium plated, they shall be
plated in accordance with class 2, type I of QQ-O-320. The minimum thickness shall be
0.001 inch for land-based aircraft and 0.0035 inch for carrier-based aircraft.
3.4.5 LeakaRe.-
3.4.5.1 Gland leakage.- The gland design shall be such that under normal opera-
ting conditions of the unit, no leakage shall occur.  Glands shall pass the functional
and life tests specified in 4.5.4 and 4.5.5.  Rubber sealing elements shall conform to
the requirements of ANA Bulletin No. 438.
3.4.5.2 Static seal leakage.- There shall be no leakage at static seals.
3.5 Performance.-
3.5.1 Seal compatibility.- When tested as specified in 4.5.4, the packings and
the metals they contact shall show no signs of sticky or gummy residue and there shall
be no discoloration or corrosion of the metals.
3.5.2 Endurance.- Hydraulic springs shall pass the cyclic operation tests speci-
fied in 4.5.5.
3.5.3 High-temperature operation.- When tested as specified in 4.5.6., there shall
be no evidence of binding, chatter, or leakage.
3.5.4 Low-temperature operation.- When tested as specified in 4.5.7, there shall
be no evidence of binding, chatter, or leakage.
3.5.5  Proof pressure.- When tested as specified in 4.5.8, there shall be no
evidence of yield, leakage, or permanent deformation of the assembly.
3

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