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Page Title:
General Design and Construction Requirement |
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|  MIL-S-85419 (AS)
incorporated in proprietary parts which do not have equivalent
standards. All exceptions shall conform to MIL-S-7742.
3.5.2.2.2 Tapered Pipe Threads. Tapered pipe threads shall be
in accordance with MIL-P-7105 and may be used only for
permanently plugging drilled or cored openings.
3.5.2.2.3 Threaded Inserts. All threaded connections in
nonferrous materials shall have steel inserts which are suitably
protected from electrolytic corrosion.
3.5.2.2.4 Safetying. Provisions shall be made to prevent all
screws and screw parts from accidental loosening. Such parts
shall be safety wired or fitted with safety stop nuts, where
applicable. All other connections liable to be loosened by
vibration shall be safetied in a similar manner.
If safetying is
by wiring, it shall be in accordance with MS-33540. The use of
lock nuts which incorporate nonmetallic inserts as a locking
feature shall not be permitted.
3.5.2.2.5 Packings. All packings shall be in accordance with
the requirements of MS-33666 or MS-33668.
3.5.3 Snapring Retainer. The use of snapring retainers is
Prohibited unless failure of the retainer will not affect
operation adversely or allow retainer fragments to enter the air
passages.
3.6 General Design and Construction Requirement. The starter
shall conform to the requirements of this specification.
3.6.1 Acceptable Design. The starter/APU shall be suitable for
operational use as an engine starter and auxiliary power unit for
supplying emergency electrical power utilizing aircraft fuel in
accordance with specification MIL-T-5624, Grades JP-4 and JP-5,
and battery for initiation of operation, and its design shall be
amenable to production processing methods. Design of each
starter/APU shall be consistent with good aircraft accessory
practices. Careful consideration shall be given in the design of
the starter/APU to simplify servicing, inspection (testing), and
overhaul.
The necessity of using special tools and fixtures for
maintenance and overhaul shall be kept to a minimum.
3.6.2 Interchangeability.
Each article of the same part number
manufactured in accordance with this specification shall be
physically and functionally interchangeable with articles bearing
the same contractor part number.
3.6.3 Components. The combination aircraft engine gas turbine
starter/APU shall consist of five separate components: a gas
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