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M61A1 GUN PRINCIPLES OF OPERATION - 14313_143
Figure 6-10.Ejection of empty case - 14313_145

Aviation Ordinanceman - Aviation theories and other practices
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well of the rotor (fig. 6-9). The insulated portion of the contact cam in the firing contact assembly depresses the firing pin cam in the breech-bolt assembly. This moves the firing pin forward against the primer of the round. 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. REVIEW NUMBER 1 ANSWERS A1. The naval aircraft that carry the M61A1 20-mm automatic gun are the F-14 and F/A-18. A2. 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). A3. The primary parts of the M61A1 gun are the barrels, housing assembly, and rotor assembly. A4. The   muzzle   clamp   assembly   restrains   in- dividual barrel movement during firing. A5. The M61A1 gun has six rifled barrels that are secured    to    the    rotor    by    three    rows    of interrupted locking lugs. A6. The   recoil   adapters   have   front   mounting points  so  the  gun  can  be  mounted  in  the aircraft. A7. The  rounds  are  guided  into  and  out  of  the extractor lip of the breech-bolt assemblies by the guide bar. A8. 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. A9. The  rear  housing  assembly  and  associated parts provide the main cam path that controls the movement of the breech-bolt assemblies. 6-8 Figure 6-9.—Breech-bolt assembly in firing cycle.







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