MIL-PRF-5503G
adjustment nuts, if used, shall not rotate or come loose during operation (see 6.3.3).
3.7 Performance.
3.7.1 Rod bearing length. The rod bearing length shall be at least the diameter of the piston rod.
When determining rod or piston head bearing length, the seal glands shall not be considered as a
bearing surface.
3.7.2 Piston head bearing area. The piston head bearing area on the barrel wall shall withstand
the compression, bending (see 6.3.4), and vibration loads imposed on the actuator during
operation as specified in the associated specification.
3.7.3 Ports. All fluid port intersections with internal surfaces of cylinder barrels and end caps
shall be perpendicular within 25° unless otherwise specified in the associated specification.
3.7.4 Proof pressure. The actuator shall withstand a pressure equal to 1.5 times the actual
differential pressure to be encountered, the proof pressure specified in SAE AS5440 or the
associated specification, whichever is greater, without evidence of leakage from the open port,
unless otherwise specified in the associated specification.
3.7.5 Endurance.
3.7.5.1 Normal service actuators (see 6.2). Normal service actuators shall withstand 20,000
operation cycles at 100% of rated pressure.
3.7.5.2 Emergency service actuators (see 6.2). Emergency service actuators shall withstand
2,000 operation cycles at 100% of rated pressure.
3.7.5.3 Pressure impulse cycles. The actuator shall with stand 50,000 cycles of rated impulse
pressure conforming to figure 2.
3.7.6 Burst pressure. The actuator shall withstand the burst pressure specified in SAE AS8775.
3.7.7 Rod bearing overlap. The rod bearing overlap (see 6.3.5) of the actuator shall be
determined considering all combinations of the actuator weight, acceleration, vibration, and
compression loads defined in the associated specification.
3.7.8 Leakage. Leakage shall not exceed the rate of one drop (see 6.4) per packing per 25 cycles
of operation at points where motion through external packing exists. There shall be no other
external leakage.
3.7.9 Bleeder plugs. When required to conform to SAE AS5440 bleeder plugs shall be
provided.
3.8 Item identification. The actuator shall be permanently and legibly marked with the items
specified in the associated specification and the following information:
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