MIL-DTL-24215D
SAE INTERNATIONAL (SAE) AEROSPACE MATERIALS SPECIFICATIONS (AMS)
SAE-AMS-QQ-S-763- Corrosion Resistant Steel Bars, Wire, Shapes and Forgings.
(Copies are available online at https://www.sae.org or from SAE International, 400 Commonwealth
Drive, Warrendale, PA 15096-0001.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein (except for related specification
sheets), the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the
requirements of this specification and the specification sheet, the latter shall govern.
3.2 First article inspection. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.5.
3.3 Material. The material shall be as specified. When a definite material is not specified, a material
shall be used which will enable the attenuators to meet the performance requirements of this
specification. Acceptance or approval of any constituent material shall not be construed as a guaranty
of the acceptance of the finished product.
3.3.1 Fungus. All material shall be inert or fungus resistant in accordance with ASTM-G21.
3.4 Design and construction. Attenuators shall be of the design, construction, and physical
dimensions specified (see 3.1). Attenuators shall be of the lightest practicable weight consistent with
the strength required for sturdiness, safety, and reliability. Mechanical stops shall be provided at the
minimum and maximum attenuation positions to prevent damage to the attenuator cards. Bearing
surfaces and gears shall be made of a durable metal that shall resist wear. A cam or detent shall be
used on step attenuators that provide a positive step at each position. End play in shafts and bearings
shall be kept to a minimum and gear mesh to comply with the backlash requirement. Control knobs, or
dials, or stub-shafts with screwdriver slot, shall be so designed that attenuator adjustment may be
readily made. The adjustment shall not change in setting as a result of shock and vibration tests.
3.4.1 Operating frequency range. The frequency range shall be as specified (see 3.1).
3.4.2 Nominal impedance. The nominal impedance for coaxial-line attenuators shall be as specified
(see 3.1).
3.4.3 Threaded parts. All threaded parts shall be in accordance with FED-STD-H28.
3.4.4 Plastic parts. All plastic parts shall be free from visible cracks or flaws.
3.4.4.1 Plastic caps. The RF connector ends of the attenuators shall be sealed with push-on plastic
caps to prevent damage and the entrance of moisture and foreign material during storage.
3.4.5 Metal parts. All metal parts shall be free from chips, burrs, and scratches in accordance with
good commercial practice. Metal parts shall be inherently corrosion resistant or treated to resist
corrosion.
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