5-13. 5-14. 5-15. 5-16. 5-17. 5-18. On an M61A1 automatic gun, what cam moves the firing pin forward against the primer of the round? 1. The locking cam 2. The contact cam 3. The firing pin cam 4. The unlocking cam What component of an M61A1 automatic gun ejects the empty case from the gun? 1. The ejector 2. The guide bar 3. The extractor lip 4. The ejection cam On an M61A1 automatic gun, what sequence of actions is performed by the breech-bolt assembly during one full firing cycle? 1. Feed, chamber, ram and lock, fire, unlock, extract, and eject 2. Feed, chamber, lock and fire, unlock, extract,and eject 3. Ram and chamber, lock and fire, unlock, extract, and eject 4. Load and lock, fire, unlock, extraxt, and eject On an M61A1 automatic gun, the clearing cycle begins when what event occurs? 1. When the pilot initiates the clearing switch 2. When the clearing solenoid is deactivated 3. When the clearing solenoid is energized 4. When the spent case reaches the rear of the gun On an M61A1 automatic gun, the bolt locking block is forced upward by which of the following components? 1. The buffer 2. The electrical solenoid 3. The coil springs 4. The leaf springs A drum unit assembly consists of the drum unit and what other major parts? 1. The entrance unit, scoop disk, and exit cover 2. The entrance cover, transfer unit, and exit cover 3. The entrance unit, scoop disk, and exit unit 4. The entrance cover, scoop disk, and exit cover 5-19. 5-20. 5-21. 5-22. 5-23. 5-24. 5-25. In a drum unit, ammunition rounds are moved along the length of the partitions by what means? 1. The entrance cover 2. The scoop disk 3. The rotation of the outer drum 4. The rotation of the double-lead helix What component(s) control(s) the position of the rounds as they are passed from the entrance cover to the scoop disk? 1. The retainer partitions 2. The inner drum helix 3. The entrance unit 4. The scoop disk extensions What component provides rotating support for an inner drum helix? 1. An exit cover 2. A scoop disk 3. An entrance cover 4. An inner drum adapter What component contains a last-round switch? 1. The entrance unit 2. The entrance cover 3. The exit unit 4. The exit cover What component prevents expended rounds from being fed into the M61A1 automatic gun? 1. The first-round switch 2. The last-round switch 3. The projectile sensor 4. The empty case sensor Live rounds or expended cases are removed from the conveyer elements and placed in the entrance cover retainer partitions by what component? 1. The exit unit 2. The scoop disk 3. The bypass unit 4. The entrance unit A transfer unit is attached to an M61A1 automatic gun housing by what means ? 1. Bolts 2. Safety wires 3. Quick-release pins 4. Quick-disconnect fittings 24