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whiskey (Why Am I Saying What What Way?) > GAU-21 > Flashcards

GAU-21 Flashcards

1
Q

-1 PDF 1272
What does “in battery” mean?

A

Bolt is in forward position

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2
Q

-1 PDF 1272
What does it say regarding using checklists during weapons emergencies? NOTE

A

Due to the nature of weapon emergencies, the use of checklists is not always practical. Perform steps 1-4 immediately.

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3
Q

-1 Malfunctions
What are the immediate actions for malfunctions? GAU - 21

A
  1. Notify Crew “_____ gun bent”
  2. Gun trained on target
  3. Forward Fire Switch OFF
  4. Charge Gun
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4
Q

-1 PDF 1271
Safe vs Safe and Clear

A

Safe= weapon does not render a dangerous condition
Safe and Clear= weapon has been visually checked to be clear of ammunition and does not render a dangerous condition

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5
Q

-1 PDF 1271
Weapons System Malfunction General
The operators first concern will be…

A

Safing the weapon

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6
Q

-1 PDF 1272
Misfire Definition

A

Complete failure of the weapon to fire.

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7
Q

-1 PDF 1272
Hang fire Definition

A

A delay in the function of the propelling charge. A hang fire cannot be distinguished immediately from a misfire and therein lies the principal danger.

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8
Q

-1 PDF 1272
Cook-Off Definition

A

Firing of the explosive components of a round due to overheating of the weapon and not due to actuating the firing mechanism.

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9
Q

-1 PDF 1272
Runaway Gun Definition

A

Failure of the weapon to cease firing when the triggers are released.

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10
Q

-1 Major Components
PDF 906

A

Auxiliary return springs assembly
Back plate assembly
Barrel & barrel extension
Barrel buffer assembly
Barrel jacket assembly
Bolt assembly
Feed cover assembly
Receiver assembly
Trigger assembly

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11
Q

Section IV GAU-21 CAUTION
Window closed

A

Ensure weapon is locked forward to prevent damage to gunners window

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12
Q

SECTION IV GAU-21 CAUTION
Stepping

A

Stepping on the ammunition can cover or the medium external connection assembly may cause damage

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13
Q

SECTION IV GAU-21 CAUTION
Ammo can front fairing

A

Lifting the ammunition can cover by the front fairing may cause damage

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14
Q

SECTION IV GAU-21 CAUTION
Probe

A

When probe is extended, round trajectory can be less than 6 inches from probe

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15
Q

SECTION IV GAU-21 NOTE
Vox

A

Firing weapons may actuate the pilots or copilots intercoms system when using VOX

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16
Q

SECTION IV GAU-21 NOTE
100 knots

A

Significant force is required to move all weapons forward of the 3-9 line when traveling at airspeeds above 100 kts

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17
Q

SECTION IV GAU-21 NOTE
When weapons aren’t being used

A

They should be stowed forward down position during taxi, takeoff, and landing (unless threat condition prohibits stowing)

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18
Q

SECTION IV GAU-21 CAUTION
Ammo chute

A

Failure to connect the ammunition chute to the gun can result in the loss of ammunition overboard and/or damage to airframe and weapon system components

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19
Q

SECTION IV GAU-21 CAUTION
Barrel cooling, what is this caution protecting?

A

Allow the barrel to cool to ambient (approx 2 min 30 sec) after firing a sustained long burst of approximately 100 rounds or many short bursts in quick succession. cooling to ambient varies depending on the environment conditions.
It’s to preclude damage to the gun barrels

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20
Q

Burst Limitations Table (Only when Static aka Hover Fire)

11W-13-21-2 PDF 60

A

1.5 sec burst = 30 sec cooling
3 sec burst = 1 min cooling
6 sec burst = 2 min 30 sec cooling

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21
Q

WARNING What is mandatory after firing 600 rounds?

11W-13-21-2 PDF 60

A

Complete cooling of the barrel to avoid injury to personnel and ensure optimal performance of the weapon.

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22
Q

Major Assemblies (salute)

11W-13-21-2 PDF 62

A

Barrel Assembly
Receiver Assembly
Bolt Assembly
Barrel Buffer Assembly
Feed Cover Assembly
Back Plate Assembly
Auxiliary Return Springs Assembly
Trigger Assembly

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23
Q

What is the purpose of the barrel extension assembly?

11W-13-21-2 PDF 63

A

Forms the link between the barrel and the barrel buffer assembly.

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24
Q

What ensures correct connection with the barrel extension and barrel buffer assembly?

11W-13-21-2 PDF 63

A

The rear shank of the barrel extension.

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25
Q

Where is the breech lock?

11W-13-21-2 PDF 63

A

It’s inserted into the rear of the barrel extension subassembly.

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26
Q

What is significant about the breech lock movement?

11W-13-21-2 PDF 63

A

It is secured to have restricted vertical movement by means of the breech lock pin. This allows it to travel along the breech long cam upward.

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27
Q

What is the receiver assembly’s purpose?

11W-13-21-2 PDF 64

A

Support, protect, and house various assemblies.

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28
Q

What piece has the bent metal piece we check on preflight it ensure that it won’t block links?

11W-13-21-2 PDF 64

A

The link guide adapter assembly.

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29
Q

Where is the breech lock cam located?

11W-13-21-2 PDF 65

A

The bottom of the receiver assembly.

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30
Q

What guides the extractor assembly? Where is it located?

11W-13-21-2 PDF 65

A

Extractor Switch
It’s located on the inner left hand side plate of the receiver assembly.

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31
Q

What forces the breech lock down? (Unlocking it from the bolt?)

11W-13-21-2 PDF 65

A

The breech lock depressors

32
Q

On preflight, what piece can you physically see at the attachment point of the barrel to the receiver?

11W-13-21-2 PDF 66

A

The Trunnion Adapter

33
Q

What secures the barrel jacket and flash suppressor onto the receiver?

11W-13-21-2 PDF 66

A

The trunnion adapter, trunnion adapter shim, and trunnion lol

34
Q

What holds back the bolt?

11W-13-21-2 PDF 69

nice

A

The bolt latch assembly

35
Q

What is happening when the triggers are depressed?

11W-13-21-2 PDF 69

nice

A

The bolt latch is rasied by the bolt latch pawl, so it releases the bolt assembly

36
Q

What is the configuration when the safing selector is in the FIRE position?

11W-13-21-2 PDF 69

nice

A

Firing cam is blocked by the timing adjusting screw.
Sear slide will come into contact with the timing adjusting screw, it’s forced to move right, thus pressing the sear down, thus releasing the firing pin extension assembly.

37
Q

What ensures that the feed cover does not close inadvertently after it has been opened?

11W-13-21-2 PDF 69

nice

A

The cover detent pawl (it’s held into place with spring tension by it’s cover lock spring

38
Q

What does the bolt assembly control/purpose?

11W-13-21-2 PDF 71

A

Feeding, extracting, ejectiong, firing pin operation (technically)

39
Q

What is located on top of the bolt to form a continuous groove for the belt feed lever lug on top of the bolt assembly?

11W-13-21-2 PDF 71

A

The alternate feed bolt switch

40
Q

What’s the purpose of the cocking lever?

11W-13-21-2 PDF 71

A

It’s used to push the extension and firing pin assembly into its cocked position.

41
Q

What holds back the rear of the firing pin spring when the extension and firing pin assembly is in the cocked position?

11W-13-21-2 PDF 71

A

Firing pin extension spring stop assembly.

42
Q

What does the sear do?

11W-13-21-2 PDF 71

A

Holds back the extension and firing pin assembly back at its cocked position.

43
Q

What’s the difference in purpose between the firing pin extension spring stop assembly and the sear?

11W-13-21-2 PDF 71

A

FPESSA= specifically holds the firing pin spring (WITHIN the firing pin extension as a whole)
Sear= holds the entire extension assembly

44
Q

What piece is the extractor vs ejector?

11W-13-21-2 PDF 70

A

Ejector is the hook shaped thing.
The extractor is the whole “body” with the extractor switch on the side. So the extractor is moreso that little U shaped lip pointing downward

45
Q

What is the functon of the extractor specifically?

11W-13-21-2 PDF 71

A

Removes a round of ammunition from the linked belt and guides the round into the T slot of the bolt assembly.

46
Q

Why do we care about the barrel buffer assembly?

11W-13-21-2 PDF 73

A

It absorbs the recoil energy of the barrel assembly.

47
Q

What do the buffer accelerators do? (the fingers lol)

11W-13-21-2 PDF 73

A

Accelerate the bolt away from the barrel extension assembly.

48
Q

What ensures correct locking with the barrel extension?

11W-13-21-2 PDF 73

A

The buffer block subassembly (like an S grip between it and the barrel extension) See diagram on PDF 72

49
Q

Where do the links vs spent cartridge cases go?

11W-13-21-2 PDF 75

A

Links go to the opposite side of the feeding
Cartridge cases are ejected through the bottom of the receiver assembly

50
Q

What are the four main pieces of the feed cover assembly?

11W-13-21-2 PDF 75

A
  1. Feed cover
  2. Cover latch shaft assembly
  3. Belt feed lever
  4. Feed slide and pawl assembly
51
Q

What safety measure is implemented into the cover latch shaft assembly?

11W-13-21-2 PDF 75

A

It cannot be opened when the safety firing assembly is at the upper FIRE position.

52
Q

GO THROUGH A POWER OFF PREFLIGHT (not -1 but parts and pieces)

A
  1. safe and clear and switches
  2. unlock it
  3. disconnect link chute
  4. check ammo can to be empty
  5. keep it locked to the rear
  6. check inside barrel for buildup
  7. safety wire
  8. barrel jacket
  9. trunnion adapter is secure
  10. link chute (disconnect)
  11. hockey stick on link chute adapter assembly (secure)
  12. feed cover
  13. belt feed lever lug is there
  14. smooth operation with belt feed lever corrosponding to the belt feed slide and pawl
  15. spring tension on the belt feed pawl arm
  16. cover latch shaft assembly spring tension
  17. link guide adapter assembly metal piece isn’t bent inward
  18. front face of bolt not damaged or buildup
  19. send bolt forward
  20. extractor ejector, spring tension no missing parts
  21. alternate bolt feed switch is setup for correct side
  22. check firing pin (set to fire, rack it, send it forward, pin protrudes, set to safe, rack it, send it forward
  23. switches cover guarded down
  24. ICS has detent
  25. swing to the rear, not gonna shoot the stab
  26. cartridge links guide alligator clips work, disconnect and inspect, reattach
53
Q

Why do we care about the back plate assembly?

11W-13-21-2 PDF 77

A

It is used to stop the bolt assembly at the end of the rearward movement and absorb the remaining recoil energy.

54
Q

What safety measure is implemented to the back plate assembly?

11W-13-21-2 PDF 77

A

The back plate latch lock makes it impossible to accidentally release teh back plate assembly by inadvertently moving the back plate latch

55
Q

Why do we care about the axuiliary return springs assembly?

11W-13-21-2 PDF 77

A

It helps push the bolt assembly toward the battery position
Why does this matter? I’m glad you asked. Because there needs to be enough force to pull the ammunition belt into the gun.

56
Q

How would a malfunction with the auxiliary return springs assembly, driving spring, or spring rod assembly? (probably, in theory)

A

The bolt wouldn’t have enough forward movement to force the belt feed slide and arm to pull the next round in. Maybe, idk, I’m making this up to try and understand.

57
Q

What three components are helping send the bolt toward the battery position?

11W-13-21-2 PDF 77

A
  1. auxiliary return springs
  2. driving spring
  3. spring rod assembly
58
Q

What does the trigger assembly control?

11W-13-21-2 PDF 81

A

The bolt latch operation (holding the bolt back or releasing the bolt)

59
Q

What are the two main phases?

11W-13-21-2 PDF 83

A

Counter Recoil
Recoil

60
Q

What are the 8 actions (cycle of ops) taking place in chronological order?

11W-13-21-2 PDF 83

A
  1. feeding
  2. chambering
  3. locking
  4. firing
  5. unlocking
  6. extracting
  7. ejecting
  8. cocking
61
Q

What happens when the trigger assembly is released?

11W-13-21-2 PDF 84

A

Cycle of operations will cease after the recoil phase.
With the bolt striking the bolt latch pawl and re-setting under the limit of travel pawl. This allows the bolt latch to drop down and re-engage the top of the bolt (lock to the rear in the open position)

62
Q

Feeding Definition

11W-13-21-2 PDF 84

A

When the next live cartridge in the ammunition belt is pulled over the belt holding pawls and onto the feed table.

63
Q

Chambering Definition

11W-13-21-2 PDF 84

A

Extractor rides underneath the extractor switch, ensuring the cartridge is positioned in front of the recessed firing pin and inserted into the chamber of the barrel.

64
Q

What forces down the extractor as it comes back to the feed table? Why do we care?

11W-13-21-2 PDF 84

A

The extractor cover spring. We care becuase it makes sure proper tension is applied on the extractor lip of the next cartridge.

65
Q

What is headspace?

11W-13-21-2 PDF 84

A

Insertion depth of the chambered cartridge.

66
Q

Locking Definition (and what piece is locking)

11W-13-21-2 PDF 85

A

Locking is for the breech
Occurs when the bolt locks to the barrel extension.

67
Q

Firing Definition (like no shit sherlock)

11W-13-21-2 PDF 85

A

Firing pin makes contact with the primer on the live round in the chamber.

68
Q

Unlocking Definition

11W-13-21-2 PDF 85

A

When the bolt is released from the barrel extension.

69
Q

What forces the breech lock down and off the breech lock cam, allowing the bolt to be unlocked?

11W-13-21-2 PDF 85

A

The breech lock pin (contacts the breech lock depressors on the inside of the receiver, this forces it down).

70
Q

Extracting Definition

11W-13-21-2 PDF 85

A

Removing a live cartridge from the ammunition belt while simultaneously removing a cartridge case from the chamber.

71
Q

Ejecting Definition

11W-13-21-2 PDF 85

A

Forcing the cartridge case out of the weapon.

72
Q

Cocking Definition

11W-13-21-2 PDF 85

A

When the cocking lever on the bolt contacts the bolt latch bracket on the receiver. This cycles the cocking lever forward forcing the firing pin extension to the rear and locking it to the sear.

73
Q

NOTE What is the difference between a stoppage and a malfunction?

11W-13-21-2 PDF 86

A

Stoppage is - interruption in the cycle of operation caused by the faulty action of the weapon or ammunition
Malfunction is - a part bending, breaking, or being worn to the point of being non-operational

74
Q

What casues the bolt assembly to move rearward? Don’t saying charging it, don’t do it

11W-13-21-2 PDF 87

A

The recoil force of the cartridge firing

75
Q

What causes faster rearward movement of the buffer accelerator? During rearward movement obvi

11W-13-21-2 PDF 89

A

Barrel extension continues moving rearward, the contact point between the barrel extension assembly and the buffer accelerator moves down.

76
Q

What prevents a double feed?

Gouge

A

The belt feed arm spring tension. When the belt feed arm is depressed upward from a round the belt feed pawl assembly is connected so it can’t engage another round to be pulled in.

77
Q

What’s an easy way to remember the major assemblies?

Phonetics

A

FART 5 B’s

whiskey (Why Am I Saying What What Way?) (16 decks)

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