MIL-DTL-45500-1 Gun, Automatic, 20Mm: M61 And M61A1This specification sheet covers a type of six-barrel, electrically fired, 20 millimeter \(mm\) automatic guns M61 and M61A1. The gun utilizes an ammunition feeder and is power driven through its cycle of operation by either an electric or hydraulic drive, or ram air turbine for installation in an aircraft armament pod system.

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MIL-DTL-45500/1A

TABLE II

SCHEDULE OF REPLACEMENT PARTS. (NOT APPLICABLE)

deleted

VERIFICATION

4.1

Conformance inspection.

4.1.1 Examination. Guns shall be visually and manually

examined in accordance with the following:

TABLE III.

Examination.

Part or assembly

Ref. Para.

Clearing solenoid (M61A1 only)

3.1.1

Chute case assembly (M61 only)

3.1.2

4.1.2 Inspection equipment. The measuring and testing

equipment shall be as specified on the Index of Inspection

Equipment Lists: IEL 7314365 (M61); IEL 11013148 (M61A1) or shall

be contractor supplied, government approved.

4.2

Test methods.

4.2.1 Function firing test procedure. The gun shall be

function fired at a cyclical rate of 6,000 to 6,400 rounds per

minute using an external power supply with control equipment,

and calibrated drive in accordance with MIL-DTL-45500E. To

calculate gun torque at minimum cyclic rate of fire, the steady

state rate of fire, and the mean differential pressure across the

drive shall be calculated using the last 50 percent of the burst

excluding stopping time. The calculated rate of fire shall be

6,000 to 6,400 rounds per minute.