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|  MIL-G-85103B(AS)
d. PGU-20/U, Armor Piercing Incendiary (API), A1022O.
e. M791, Armor Piercing - Discarding Sabot - Traced (APDS-T), AS12013525.
The gun shall be capable of handling and firing this round.
Ammunition in the gun shall be smoothly accelerated and decelerated to reduce
handling loads, and to increase durability and reliability.
3.1.3 Major components list. The gun system shall consist of, but not be
limited to, the components shown in Figure 1.
3.1.4 Government-furnished property (GFP). The following GFP shall be
furnished to support contractor testing, as specified in the contract or the
purchase order (see 6.2).
a.
Standard Service Class 25mm ammunition.
b.
Standard Service Class 25mm links.
c.
Such other materials as may be required, the procurement of which, would
be more expedient if furnished by the Government.
3.2 Characteristics.
3.2.1 Performance.
3.2.1.1 Electrical power. The gun system shall maintain performance as
specified herein when supplied with 28 Vdc (nominal) 15 A (maximum) electrical
power in accordance with MIL-STD-704 for Category B equipment.
3.2.1.2 Dispersion and accuracy. When installed on a restrained AV-8 air-
craft or when installed on a ground firing test stand, the gun system shall place
80 percent minimum of all fired projectiles in 178mm (7.0 inches) diameter circle
at a range of 25.4 meters (m) (1,000 inches) for dispersion. Data taken during
test firing shall be used to determine the location limits of the center of the
80 percent group in relation to the true boresight point for accuracy (see
6.3.1).
3.2.1.2.1 Gun subsystem dispersion. The gun subsystem shall place 80 per-
cent minimum of all fired projectiles in a 127mm (5.0 inch) diameter circle at a
range of 25.4 m (1,000 inches) for dispersion. Data taken during test firing
shall be used to determine the location limits of the center of the 80 percent
group in relation to the true boresight point for accuracy (see 6.3.1).
3.2.1.3 Firing rates. The gun system shall be capable .of firing 3,600
rounds per minute. The steady state firing rate shall remain within the limits
of 3,400 to 4,000 rounds per minute. The gun system shall fire a minimum of 45
rounds in 1.0 second after application of the trigger on signal. The time
between successive bursts, which is the time measured for the last round fired of
the previous burst of the first round fired or the succeeding burst, shall be
kept to a minimum and shall not exceed 0.8 second.
3.2.1.4 Clearing.
The gun system shall incorporate positive clearing
safety features. The cleared gun shall not have any portion of a live round in
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