Blk 7 GAU-2C Flashcards
barrels, bolts and removable tracks
Six
Characteristics
Electrically driven
Air cooled
Multi-barrel weapon
Capabilities
2000 rpm low rate
4000 rpm high rate
Pilot limited to 2000 rpm
Effective range
Tracer Burnout
Max Range
1500
750
3000
Limitation
Azimuth, elevation and depression.
Advantages & disadvantages
Multi-Barrel design
Not a stand alone system, Requires external power source and ammunition storage to employ
GAU-2C 10 Major Components
Rotor Assembly Bolt Assemblies (6) Removable tracks Gun housing assembly Safing Sector Housing Cover Guide Bar Aft Gun Support/Clutch Assembly Barrel Assembly Barrel Clamp Assembly
Rotor Assembly
Main structural component of the gun
Supported in the gun housing by annular ball bearings and supports the barrel cluster
Bolt Assemblies (6)
Contain the firing pin action
Pick up a cartridge from the guide bar, camber and fire the round
Removable Tracks
Provide a baring surface on the bolt assembly’s slide
Gun Housing Assembly
provides a mount for the safing sector, housing cover, guide bar and gun drive motor
Safing Sector
When removed, the bolt assemblies cannot be cammed into battery by manual or mechanical rotation of the barrels
Housing Cover
Provides an inspection and service acces to the lot assemblies
Guide Bar
Guide bar fingers direct the cartridges from the feeder de-linker to the extractors of the bolt
Aft Gun Support/Clutch Assembly
Serves as a mounting point for the hand-grip assembly. Consists of an electrical solenoid gear and mecanical linkage to couple the clutch gear with the rotor and feeder assemblies.
Barrel Assembly
Provide the aiming path for the projectile to follow after it has been fired
Barrel Clamp Assembly
Steps along the barrel and at the muzzle provide mounting for the barrel clamp assembly
GAU-2C 6 Accessories
Feeder/De-linker (Dillon Feeder) AC Electric Drive Motor Gun System Control Panel (GSC) Gun Control Unit (GCU) Electronic Control Unit (ECU) Safing Bar
Feeder/De-linker (Dillon Feeder)
Accepts the ammo from the ammo feed chute assembly, delinks the rounds, and feeds the rounds to the guide bar of the gun
AC Electric Drive Motor
Assists the mechanical action of the machine gun by driving the rotor and when the clutch solenoid is activated the feeder de-linker
Gun System Control Panel (GSC)
Left and Right switch determine the operational mode (FWD, SAFE, SIDE), MASTER ARM provides an arming signal to the LH/RH gun ECU.
Gun Control Unit (GCU)
Mounts between the handgrips, provides an ICS push to talk switch, ARM switch, and HI and LO RATE trigger switches
Electronic Control Unit
Primary power is supplied to each ECU via the GSC panel. AC gn drive motor and booster drive assembly are controlled by the staion ECU to provide 2 rates of fire. The ECU also provides a control signal to energize the clutch solenoid
Safing Bar
Acts as a mechanical safe to prevent the gun from rotating
GAU-2C Cycle of Operations
Feeding Chambering Locking Firing Extracting Ejecting Cocking Clearing
Feeding
Firing Cycle begins when mechanical power is applied to the forward gear of the rotor assembly.
Chambering
Round is chambered, the bolt assembly roller reaches the forward dwell portion of the elliptical cam.
Locking
The bolt head is the allowed to rotate by the bolt head helix camping
Firing
The firing pin spring drives the firing pin forward to strike the primer of the chambered round
Extracting
The bolt head rotates back until its grooves align with the rotor tracks, the bold assembly continues to move rearward along the reverse segment of the elliptical cam path to extract the case from the chamber
Ejecting
As the bolt assembly reaches its rear dwell position on the rotor, the case is eject by the guide bar
Cocking
The bold assembly has completely cycled thru the elliptical cam path all six bolt assemblies repeat this cycle while power is applied to the front gear of the rotor assembly
Clearing
The clutch solenoid remains energized for 40 msec then de-energizes to de-clutch the feeder assembly. The booster drive remains energized for 80 msec to prevent the ammo belt from desengaging the feeder. The gun drive remains energized for 400 msec, which allows the gun to clear by firing the remaining rounds.
