The gun system is intended to provide 25mm fire power when installed on the AV-8 aircraft. The gun, a major component of the gun systems is intended to provide 25mm fire power when mounted internally in aircraft in gun pods, or on surface vehicles.
Procurement documents should specify the following:
a. Title, number, and date of this specification.
b. Government-furnished property (see 3.1.4).
c. Preservation-packaging (see 5.1).
d. Fungus test, if required (see 3.2.5.9).
e. Drawings required (see 3.4.1).
f. Test plans required (see 3.4.3).
g. Failure reports (see 4.3.3).
h. High impact test, if required (see 3.2.5.11.2).
i. Reliability program, if required (see 3.2.3).
j. Interference control plan (see 3.3.2).
k. Integrated logistics support (see 3.5).
l. Personnel and training (see 3.6).
m. Responsibility for inspection, if other than as specified in 4.1.1.
The true boresight point of the gun is defined as the geometric center of all the individual barrel boresight points generated when each of the barrels is in the indexed firing position. Each individual barrel boresight point is determined by inserting a boresight tool in the muzzle of the barrel and marking a target at 25.4 m.
Steady state firing is continuous firing of a least thirty rounds within the firing rate specified in 3.2.1.3.
A stoppage occurs when gun firing is involuntarily interrupted and cannot be resumed by the use of the remote gun system control.
A failure is defined as the inability of the gun system to meet the requirements as specified herein. Malfunction due to Government furnished equipment or human error will not be considered a failure.
The barrel life is considered as having ended when the average velocity of a burst of 60 rounds, ±10 rounds, drops 61 meters per second or more with respect to that of a similar burst with new barrels, or when the projectiles from 20 percent of the rounds in any burst show keyholing which is defined as yaw exceeding 15 degrees at 25.4 m ranges or whichever occurs first.
The loading, assembly, and handling of the explosives and the finished items covered by this specification involve hazardous operations and therefore require explosive safety precautions. Standard precautions for explosive-loaded items are contained in DoD 4145.26M.
Asterisks are not used in this revision to identify changes with respect to the previous issues due to the extensiveness of the changes.
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