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|  MIL-H-8890(ASG)
3.5 Interchangeabilit y.- All replaceable parts or assemblies having the
same manufacturer's or contractor's pert number shall be directly and completely
interchangeable with each other with respect to installation and performance.
Each assembly shall be designed to be replaceable with all other assemblies having
the same part number without requiring the replacement of the other assemblies.
Change in part numbers shell be governed by the drawing number requirements of
Specification MIL-D-70327 and coordinated with the air vehicles contractor and pro-
curing activity. Interchangeability requirments are not applicable to detail
parts of permanent assemblies, such as welded assemblies, or matched detailed
parts such as lapped components.
3.6 Lubricants . - When special lubricants are required, the lubricant used
must be compatible with the hydraulic fluid and withstand the temperature and
altitude ranges specified in the detail specification. The means of lubrication
and the lubricant used shall be approved by the procuring activity. Lubrication
shall be so accomplished that no disassembly for relubrication is necessary during
endurance testing or normal service life.
3.7 Weight.- Weight shall be maintained as low as possible, consistent with
the requirements of this specification. The weight of the assembled component
shall not exceed that specified in the detail specification.
3.8 Envelope.- The external dimensions of the component shall be within the
envelope dimensions shown on the detail specification. Mounting and port dimen-
sions shall be within the tolerances specified. If no envelope is shown, the
dimensions of the component shell conform to the manufacturer's drawings as
approved for the component.
3.9 Finish.-
3.9.1 Surface roughness . - Surface roughness finishes, where required, shall
be established and shall be specified on the manufacturers assembly drawings as
outlined in Standard MIL-STD-10. The determination of surface finish shall be
made with a profilometer, comparator brush analyser, or other suitable comparison
equipment with an accuracy of + 15 percent at the level being measured.
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