MIL-PRF-5503G
landing gears and bomb bay doors. The complete actuator assembly may incorporate other
components, such as check valves, solenoid valves, bypass valves, and pressure switches, in
addition to the actuator. The actuator may be controlled by mechanical linkage, electrical means,
or direct hydraulic power.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of this specification.
b.
Type of actuator required (see 1.2).
c.
Associated specifications (see 3.1).
d.
When first article inspection is required (see 3.2).
e.
Sampling level (see 4.3.2).
f.
Packaging requirements (see 5.1).
g.
Data required.
6.3 Guidance.
6.3.1 General.
6.3.1.1 Cylinder-barrels. The cylinder barrels of actuating cylinders were previously
manufactured from steel or aluminum alloy forgings produced by hollow forging without flash
formation or from steel seamless tubing or bar stock. When aluminum alloy cylinders were used
with steel pistons, the bearing areas of the piston head was chrome plated. Both the internal and
the external surfaces of aluminum cylinders were shot peened or roller burnished to produce a
compressive residual stress pattern. Light honing, not exceeding 20% of the depth of the
compressive zone resulting from shot peeing, was permitted to obtain final dimensions and
surface finish requirements. Exceptions to the compression requirements were materials which
were demonstrated to be as free from susceptibility to stress corrosion cracking as 7075 (T73
heat treat) aluminum alloy. Pistons fabricated with other than chromium plated steel were used
with aluminum-alloy cylinder barrels if data could substantiate adequate service life expectancy
and protection from corrosion, including corrosion during storage periods. Aluminum alloy was
not used on the bearing surface of the piston head.
6.3.1.2 Surface plating. All chromium plating used on piston rods or sliding surfaces was in
accordance with Class 2 of SAE AMS QQ-C-320. Other surface coatings were also used
provided prior approval of such coating was obtained from the acquisition activity.
6.3.1.3 Finish. Members such as piston rods, cylinder bores, and other gland diameters were
previously held to the surface finish as specified in AS4716. The surface finish increments and
specification were as specified in ASME B46.1. Piston rods and all other wear surfaces were
sufficiently hard and corrosion resistant to ensure adequate service life.
6.3.1.4 Dashpot. When a dashpot was built into an actuator, an analysis was made to ensure
sufficient structural strength resulting from high hydraulic pressures encountered during
operation. The use of packings or seals was avoided when possible.
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