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M102 105mm Gun Flashcards

1
Q

Characteristics of the M102 105mm gun

A 
Percussion-fired
Single barrel cannon
Hand-fed
Recoil operated
Air cooled
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2
Q

The M102 105mm gun provides fire against personnel, soft targets and light armor with _________ ________

A

pinpoint accuracy

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3
Q

The rate of fire of the M102 105mm gun is dependent on __________ ____________

A

crew efficiency

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4
Q

The maximum rate of fire for the M102 105mm is ______ rounds per minute for the first _______ minutes and then ________ rounds per minute thereafter

A

ten
three
three

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5
Q

CAUTION: Do not fire the 105mm gun when recoil exceeds _____ inches, to prevent excessive pressures in the recoil cylinder and excessive stress in the recoil mechanism

A

49

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6
Q

The two major components of the 105mm are:

A

Cannon Assembly

Recoil Mechanism

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7
Q

The cannon assembly of the 105mm consists of the following 3 parts

A

Blast Diffuser
Tube
Breech Mechanism

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8
Q

The _________ ____________ provides muzzle blast suppression, is internally threaded and attaches to the muzzle end of the tube and incorporates wedge-shaped bosses which act as secondary recoil stops in the event of a recoil mechanism failure.

A

blast diffuser

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9
Q

The AC-130U blast diffuser has a _______ ________ attached to cover the opening when the aircraft is pressurized

A

seal plate

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10
Q

The ________ houses round and directs projectile when fired. It is externally threaded at muzzle end to accommodate the internal threaded blast diffuser. The breech end is also threaded and screwed into the breech ring.

A

Tube

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11
Q

The ___________ ___________ holds the round of ammunition, detonates the propellant charge and partially extracts the empty case (or live round if not fired) It is housed in the breech ring

A

Breech Mechanism

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12
Q

The breech mechanism of a 105mm contains the ________ ________, a vertical sliding wedge

A

Breech Block

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13
Q

Internal components of the Breech Block include:

A 
Trigger
Percussion Mechanism
Sear
Retractor
Cocking Lever
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14
Q

The ___________ ___________ contains the firing pin

A

Percussion Mechanism

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15
Q

The ________ pulls (cocks) the percussion mechanism rearward when the breech block is lowered

A

retractor

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16
Q

The __________ _________ is used to manually cock the firing mechanism with or without opening the breech

A

cocking lever

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17
Q

The ________ __________ __________ __________ is used to open and close the breech

A

breech block operating handle

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18
Q

The ________ _____________ __________ transmits the movement of the breech block operating handle, moving the breech block up and down

A

breech operating crank

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19
Q

__________ holds the breech block down and extracts and partially ejects empty cartridge case (or live round if not fired) from chamber

A

Extractors

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20
Q

The purpose of the ________ __________, a major component of the 105mm, is to stop the recoiling parts and return them to battery position without excessive shock

A

Recoil Mechanism

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21
Q

The recoil mechanism of the 105mm consists of the following 4 parts:

A

Cradle assembly
Sleigh assembly
Recuperator Cylinder
Recoil Cylinder

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22
Q

This part of the recoil mechanism supports the sleigh assembly and is fixed to the aircraft by the gun box and TGM.

A

Cradle assembly

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23
Q

The sleigh assembly ________ within the cradle assembly

A

slides

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24
Q

This part of the recoil mechanism includes 4 yokes which hold the recoiling parts together

A

Sleigh assembly

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25
Q

The ___________ ___________ houses and supports the recuperator cylinder at the top, cannon assembly in the center and the recoil cylinder at the bottom

A

sleigh assembly

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26
Q

The breech ring of the cannon assembly is threaded into the ________ yoke of the sleigh assembly

A

fourth

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27
Q

The _______ and ________ yoke of the sleigh assembly support the tube

A

first

second

28
Q

The purpose of the _________ __________, a part of the recoil mechanism, is to absorb gun recoil by gradually checking and stopping rearward motion of recoiling parts

A

recuperator cylinder

29
Q

Energy of the recoiling parts is exhausted in the process of forcing ________ through passages

30
Q

The recuperator cylinder is divided into the two following parts:

A 
Regulator Body (front section)
Nitrogen chamber (rear section)
31
Q

The __________ __________, the front section of the recuperator cylinder, contains oil, which fills space between the floating piston and front head

A

regulator body

32
Q

The _________ ___________, or rear section of the recuperator cylinder, contains compressed nitrogen gas between floating piston and rear head

A

nitrogen chamber

33
Q

The recoil cylinder contains oil, which passes back and forth between the recoil cylinder and the recuperator cylinder by means of connecting passages in the _______ yoke

34
Q

The recoil cylinder contains the ________ piston

35
Q

The _________ _________ is secured to the front of the cradle assembly cradle by a recoil piston rod and recoil rod nut

A

recoil cylinder

36
Q

The recoil cylinder holds the oil and separates it from the ______ that fills the rear portion of the recoil cylinder

37
Q

The _________ __________ _________ is mounted on top of the recuperator cylinder and two adjustable _______ are mounted in the gun box

A

Buffer striker plate

snubbers

38
Q

_________ act as shock absorbers

39
Q

The recoil cylinder contacts the __________ __________ __________ during the last few inches of recoil, easing the gun back into the battery

A

buffer striker plate

40
Q

The 105mm cycle of operations consists of the following cycles:

A

Firing
Recoil
Counter-recoil
Reloading and Re-cocking

41
Q

The firing cycle begins if all _________ pass for the selected firing mode

42
Q

A signal is sent to the ECU, then the GRU, followed by 28V DC being applied to the _________ _________

A

firing solenoid

43
Q

The signal applied to the firing solenoid forces the firing pawl rearward, actuating the ________ _______

A

firing plunger

44
Q

The plunger rotates the __________, which then rotates the sear, disengaging the sear lug allowing the percussion mechanism spring to drive the percussion mechanism forward to strike the primer

45
Q

The round is fired and the force of the ___________ ______ propels the projectile out of the bore

A

expanding gas

46
Q

The same force that reacts against the breechblock, forces the recoiling parts (recuperator cylinder, recoil cylinder, sleigh and tube) __________

47
Q

The ________ ________ is held in position by the piston rod, which is secured to the front of the cradle by the recoil piston rod nut

A

recoil piston

48
Q

As the recoiling parts move back in recoil, the recoil oil in the recoil cylinder is forced through the oil orifices in the second yoke up into the regular body of the ______________ ___________

A

recuperator cylinder

49
Q

The _________ ________ contains a one-way valve and a throttling opening through which the oil passes into the recuperator cylinder

A

regulator body

50
Q

As the oil enters the recuperator cylinder, it acts on the floating piston, forcing it to the rear and compressing the __________ _______ behind the floating piston

A

nitrogen gas

51
Q

As the floating piston moves to the rear, a ________ ______ which is fastened to the diaphragm, is drawn through the throttling orifice, gradually reducing the flow of oil, slowing the recoiling parts

A

control rod

52
Q

Once the nitrogen is ________ _____________ the recoiling parts are brought to rest

A

fully compressed

53
Q

When the recoiling parts are brought to rest at the end of recoil, the unbalanced force of the greatly compressed nitrogen gas forces the _________ ________ forward

A

floating piston

54
Q

The floating piston forces the recoil oil back through the regulator, down through the second yoke and back into the recoil cylinder against the back of the recoil piston. This forces the recoiling parts back into the _________ __________

A

battery position

55
Q

As the recoiling parts are brought back into battery, the ________ _________ __________ on the recuperator cylinder contacts the snubbers, easing the gun into battery, reducing shock on the airframe

A

buffer striker plate

56
Q

Once the gun has returned to the battery position, the gunner will open the _________ by depressing the breech operating handle and rotating it aft

57
Q

Rotation of the _________ __________ ___________ ___________ to the rear rotates the breech operating shaft and gears, lowering the breech block

A

handle breech operating handle

58
Q

As the assembly lowers, the cocking lever follows a cam path on the left side of the breech assembly, rotating the ___________ which moves the percussion mechanism via the sear lug

59
Q

The ________ ________ is forced under the sear notch which rotates the sear and locks the percussion mechanism to the rear

60
Q

While lowering the breech, the __________ are cammed to the rear extracting, partially ejecting the spent case and locking the breechblock open

A

extractors

61
Q

When a new round is inserted, it forces the extractors forward, unlocking the ____________

A

breechblock

62
Q

As the breech operating handle is rotated forward the extractors follow the cam surface and are moved _________ as the breech is raised

63
Q

Once the __________ is fully raised, the operating handle is locked closed and the next round is ready to be fired

A

breechblock

64
Q

The purpose of the inspection is to ensure that the gun system is in operational condition in accordance with:

A

IAW T.O. 1C-130(A)U-1

65
Q

Safety procedures for inspection of the 105mm include:

A

Remove all jewelry prior to performing inspection
Always safe and clear weapon prior to inspection
Ensure no rounds exist in the chamber

SMA (30 decks)

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