MIL-PRF-87819 Headset-Microphone, \(Hearing Protective Type, High And Moderate Ambient Noise Levels\), General Specification ForThis specification covers the requirements for headset-microphone with rigid headband. These parts meet established requirements for communications equipment used to protect against hazardous noise exposure, and are approved for use in certain high and moderate ambient noise level applications \(see 6.1\). The term headset is to be used interchangeably for headset-microphone and is used when referring to any of the articles covered in this specification.

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MIL-PRF-87819B

Letter

Inches

Design dimension

Tolerances

Design dimension

Tolerances

4.50

Max

114.3

Max

1.75

Max

44.45

Max

3.60

� 0.031

� 91.44

� 0.7874

NOTES:

1. Envelope dimensions shall be as shown, to provide interface to the emergency oxygen mask

harness.

2. All cable entry or other holes in the earcup shall be strengthened to meet the environmental and

shock (drop) requirements of this specification.

3. Each earcup shall be secured to its yoke in a manner which prevents inadvertent detachment, as

specified in the Foreign Object Damage requirements of this specification (see 3.5.16), while

allowing replacement of the earcup during repair.

4. When specified (see 3.1), the volume control knob shall not restrict the movement of the

microphone boom assembly, the earcup, or yoke and shall be located on the left earcup in an easily

accessed position, such as one of the two suggested positions shown here.

5. Dimensions are in inches. Unless otherwise specified, tolerance is � 0.015 inch. Metric equivalents

are given for information only.

FIGURE 1. Earcup shell dimensions.