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MV22 240D Instructor > M240D > Flashcards

M240D Flashcards

1
Q

How many major assemblies are there?

A

10 major assemblies

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2
Q

M240B characteristics

A

Belt fed, gas operated, air cooled, left feed automatic weapon fired from the open bolt position, providing medium range suppressive fire

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3
Q

Rate of fire

A

650-950 rounds per minute

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4
Q

Egress kit

A

Butt stock, buffer assembly, sling with swivel, infantry trigger assembly, and a bipod assembly

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5
Q

Caliber and ammunition

A 
7.62mm
Ball
Blank
Tracer
Dim tracer
Armor piercing
Armor piercing tracer
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6
Q

Gun, overall length (w/ spade grip and flash suppressor installed)

A

41.25 in

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7
Q

Barrel length (handle and flash suppressor installed)

A

25.75 in

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8
Q

Spare barrel weight

A

7.0 lbs

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9
Q

Gun weight

A

26.5 lbs

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10
Q

Rifling number of grooves

A

4

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11
Q

Rifling twist (direction)

A

Right hand

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12
Q

Rifling twist (one turn in)

A

12 in

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13
Q

Cooling

A

Air

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14
Q

Muzzle velocity (ammunition dependent)

A

2,750 f/sec

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15
Q

Max range

A

3725 m (~12,200 ft)

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16
Q

Max effective range

A

1200 m (~4000 ft)

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17
Q

Major assemblies

A

10
Barrel assembly, cover assembly, feed tray, tray and axis cover pin, bolt and operating assembly, driving spring rod assembly, trigger housing assembly, trigger spring pin, receiver assembly, buffer and spade grip assembly

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18
Q

Gas regulator plug

A

Designed to maintain a constant rate of fire under adverse conditions, not to increase the rate of fire

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19
Q

Gas regulator plug settings

A

1: 650-750 rounds per minute, normal operations
2: 750-850 rounds per minute
3: 850-950 rounds per minute
Settings 2 and 3 are used when carbon buildup, cold weather, or dusty conditions reduce the firing rate

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20
Q

Prolonged firing on gas plug settings __ and __ may cause cracks on the ___ ____ _____

A

2, 3, bold guide rails

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21
Q

Barrel assembly

A

Consists of a gas regulator, which adjusts the rate of fire

Houses the ammunition cartridge for firing

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22
Q

Spade grip and buffer assembly

A

Absorbs recoil from the bolt and operating rod assembly at the end of recoil movement. It is only used when airborne

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23
Q

Driving spring rod assembly

A

Provides energy for returning bolt and operating rod assembly to firing position

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24
Q

Bolt and operating rod assembly

A

Provides feeding, stripping, chamfering, firing, extraction, and ejection of cartridges using the projectile propelling gases for power

25
Q

Trigger housing assembly

A

Controls the firing of the machine gun and contains the safety mechanism

26
Q

Cover assembly

A

Feeds belted ammunition and holds cartridges in position for stripping, feeding, and chambering

27
Q

Feed tray

A

Serves as a guide for positioning cartridges for chambering

28
Q

Receiver assembly

A

Serves as a support for all major components and houses the action of the weapon and controls functioning of the weapon

29
Q

M24 Blank Firing Attachment

A

Used to restrain gun gasses allowing operating when blank ammunition is used

30
Q

M21 discriminator

A

Placed on the feed tray to prevent live ammunition from being chambered

31
Q

Headspace checks

A

Headspace checks are required prior to installing a new barrel.
Assigned spare barrels may be headspace checked and tagged to the receiver assembly prior to flight, allowing a quick barrel chance in flight

32
Q

Cycle of operations

A 
Feeding
Chambering
Locking
Firing
Unlocking
Extracting
Ejecting 
Cocking
33
Q

Stoppage

A

Any interruption in the cycle of operations caused by faulty action of the weapon or ammunition

34
Q

Malfunction

A

Caused by a part bending, breaking, or being worn to the point of being non operational

35
Q

In flight sustained burst limitation

A

100 rpm w/ 4-6 sec between bursts.
8 second burst length.
Barrel change every 10 mins.

36
Q

In flight rapid burst limitations

A

200 rpm w/ 2-3 sec between bursts.
9-15 sec burst length.
Barrel change every 2 mins.

37
Q

In flight cyclic burst limitations

A

650-950 rpm w/ 2-3 sec between bursts.
60 sec burst length.
Barrel change every 1 min.

38
Q

Aviation trainer (static) burst limitations

A

Same as in flight sustained

39
Q

Interior ballistics

A

Factors within the barrel affecting the motion of the projectile before it leaves barrel. Total effects of all interior ballistic factors determines the velocity with which the projectile leaves the muzzle.

40
Q

Barrel length and rifling

A

Longer the barrel greater the velocity.

Re fling is made of two components, lands and grooves.

41
Q

Barrel wear

A

Caused by burning propellant and movement of the projectile. Results in a loss of muzzle velocity.

42
Q

Propellant charge

A

Small differences in muzzle velocity and trajectory caused by production variation. Affected my temperature, moisture, and non uniform distribution of propellant encountered in the production and storage environment

43
Q

Projectile weight

A

Projectiles of the same size may very within tolerance in weight. Especially true in linked-ball and tracer. Heavier projectile will have a lower velocity.

44
Q

Exterior ballistics

A 
Factors that affect projectile motion along the trajectory. Aerial fired weapons have all the exterior ballistic factors associated with short range, ground fired weapons, plus other factors unique to aerial fired weapons. 
Air resistance (drag), yaw, gravity, wind drift, and projectile drift (horizontal plane gyroscopic effects)
45
Q

Air resistance (drag)

A

Friction between the air and the projectile causes drag.

46
Q

Yaw

A

The angle between the centerline of the projectile and the trajectory. Causes trajectory to change and increases drag.

47
Q

Gravity

A

Causes a projectile to drop as it travels towards a target. Amount depends on time of flight (TOF), distance to a target, and muzzle velocity of the projectile. Gravity drop at a rate of 32 fps^2.

48
Q

Wind Drift

A

Lateral movement of the projectile caused by wind force acting on the projectile within flight. Amount of drift depends on the projectiles TOF and the wind speed acting on the cross-sectional area.

49
Q

Projectile Drift (Horizontal Plane Gyroscopic Effects)

A

US projectiles, as viewed from the rear, spin in a clockwise direction. Spinning projectile acts as a gyroscope. This causes the projectile to precess or move to the right. It is necessary to aim to the left of the target.

50
Q

Aerial Ballistics

A

Ballistic factors peculiar to aerial-fired weapons vary based on projectile. Spin-stabilized, fin-stabilized, fired from a fixed position, or on the move. MV-22 projectiles are spin-stabilized.
Turning error, rotor wash error, trajectory shift, projectile jump (vertical plane gyroscopic effect), and port-starboard effect.

51
Q

Turning Error

A

Engagement of a target in a turn results in rounds that impact short and inside the turn. To compensate, elevate the boreline axis of the weapon above the target. The gunner must aim high and opposite the turn.

52
Q

Rotor Wash Error

A

Hige or approaching the landing phase, the combination of downwash from the proprotors and reflected downwash off the ground causes the projectile to wobble., thus inducing both lateral and linear error. Hoge eliminates the reflected downwash. This decreases later error but may increase lineral dispersion.

53
Q

Trajectory Shift

A

When the boreline axis of h\the weapon differs from the flightpath of the MV-22, the forward velocity of the aircraft causes a change in the direction and velocity of the projectile. For deflection shots within 90 degrees of either side of aircraft heading, trajectory shift will cause the round to be left or right of the target. Firing from the rear or ramp will cause to projectile to loose muzzle velocity, therefore, the round will fall short.

54
Q

Projectile Jump (Vertical Plane Gyroscopic Effect)

A

If a projectile is fired in any direction other than along the line of flight, an initial yaw will be induced due to a crosswind. In addition, a projectile jump is produced that is proportional to initial yaw. Firing to the right produces a downward jump, firing to the left produces an upward climb.

55
Q

Port-Starboard Effect

A

Trajectory shift, projectile drift, and projectile jump result in the port-starboard effect. Left, left, low. Right, Right, High.

56
Q

Terminal Ballistics

A

The characteristics and effects of projectiles at the point of impact. Withe RMWS, only concerned with the surface conditions at the point of impact.

57
Q

Surface Conditions

A

The condition of the target surface area affects the lethality of the weapon.

58
Q

Dispersion

A

Points of impact of projectiles will vary in deflection and range. Caused by error inherent in firing the projectiles. Caused by the conditions in the bore, conditions in the mount, and vibrations in the mount.

MV22 240D Instructor (1 decks)

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