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Figure 6-8.Round guided into breech-bolt assembly
Figure 6-10.Ejection of empty case - 14024_173

Aviation Ordinanceman 1 - Aviation theories and other practices
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The conductor portion of the contact cam makes contact with the firing pin cam, which allows a firing voltage to pass through the firing pin to fire the round. The breech-bolt assembly remains locked throughout the locking cam period until the projectile leaves the barrel. After the projectile leaves the barrel, the barrel pressure is reduced. The unlocking cam lifts the bolt shaft, retracts the bolt locking block, and unlocks the bolt. The main cam path guides the breech-bolt assembly rearward The empty case is removed from the chamber by the extractor lip of the bolt assembly. Then, the bolt assembly travels back along the rotor tracks until the guide bar removes the empty case from the bolt extractor lip and ejects it from the gun (fig. 6-10). To complete the cycle, the bolt assembly travels along the rear cam dwell area and into position to receive the next round. The breech-bolt assembly has now completed a full firing cycle through the elliptical-shaped main cam path. A1. A2. A3. A4. A5. A6. A7. A8. A9. A10. It has performed seven actions or operations in the following sequence: 1. Feed 2. Chamber 3. Lock 4. Fire 5. Unlock 6. Extract 7. Eject All six breech-bolt assemblies repeat this firing cycle until the clearing solenoid is actuated, and the gun starts the clearing cycle. Clearing Cycle The clearing cycle starts when the clearing solenoid is energized. The clearing solenoid depresses the REVIEW NUMBER 1 ANSWERS TO QUESTIONS Q1. THROUGH Q10. The naval aircraft that carry the M61A1 20-mm automatic gun are the F-14 and F/A-18. When installed in naval aircraft, the M61A1 gun has a pilot selectable firing rate of 4,000 rounds per minute (GUN LOW) and 6,000 rounds per minute (GUN HIGH). The primary parts of the M61A1 gun are the barrels, housing assembly, and rotor assembly. The muzzle clamp assembly restrains individual barrel movement during firing. The M61A1 gun has six rifled barrels that are secured to the rotor by three rows of interrupted locking lugs. The recoil adapters have front mounting points so the gun can be mounted in the aircraft. The rounds are guided into and out of the extractor lip of the breech-bolt assemblies by the guide bar. The rotor tracks, rotor drive gear, and the locking lugs to lock the barrels in place are contained in the main body of the rotor assembly. The rear housing assembly and associated parts provide the main cam path that controls the movement of the breech-bolt assemblies. You should use DOD-L85336 lubricant for the M61A1 gun. 6-8







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