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MIL-C-172 Revision C, December 8, 1958
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CASES, BASES, MOUNTING & MOUNTS VIBRATION
Includes all amendments and changes through Amendment 6, February 15, 2001
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This specification covers cases, mounting bases, and vibration mounts used to enclose and isolate electronic equipment in aircraft from external vibrations. This specification establishes the general requirements and dimensions thereof, defines the space limitations in aircraft therefor, and sets forth the performance and dimensional requirements thereof, in order to insure interchangeability.

Items covered by this specification are standard cases identified by MS part numbers, nonstandard cases, and mounting bases and vibration mounts of the following classes, as specified (see 3.1 and 6.2):

Mounting bases — Mounting bases conforming to the performance, dimensional, and two-to-one load-carrying requirements of this specification, and identified by MS part numbers.

Vibration mounts — Vibration mounts conforming to the performance, dimensional, and two-to-one load-carrying requirements of this specification, and identified by MS part numbers.

Mounting bases — Mounting bases conforming to the performance and dimensional requirements of this specification. Load-carrying capability can be two-to-one, or ± 15 percent with nongeometric center of gravity. Unless otherwise specified (see 6.2), the mounting bases are identified by individual nomenclature in accordance with the Joint Communication-Electronic Nomenclature System (AN) (see 6.8).

Vibration mounts — Vibration mounts conforming to the performance, dimensional, and ± 15 percent load-carrying requirements of this specification, and identified by MS part numbers.

Mounting bases — Mounting bases conforming to the performance requirements of this specification. They can have individual electrical connectors and, unless otherwise specified (see 6.2), are identified by individual AN nomenclature (see 6.8).

The MS part number for standard cases shall be as specified (see 3.1). Nonstandard cases shall be identified as specified (see 6.2).

The MS part number for class A mounting bases shall be as specified (see 3.1). Unless otherwise specified (see 6.2), the nomenclature for classes B and C mounting bases will be established in accordance with the AN system (see 6.8).

The MS part number for vibration mounts shall be as specified (see 3.1).