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Master Gunner 3-19 > Annex A > Flashcards

Annex A Flashcards

1
Q

Weight of auto gun receiver

A

90lbs

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2
Q

Weight of barrel assembly (ribbed)

A

107lbs

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3
Q

Weight of barrel assembly (non-ribbed)

A

95lbs

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4
Q

Weight of automatic gun feeder

A

59lbs

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5
Q

Weight of total gun system (ribbed)

A

256lbs

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6
Q

Weight of total gun system (non-ribbed)

A

244lbs

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7
Q

What is time to rate

A

0.15 sec the time from when the gun receives the signal to start until mechanical actions begin to start

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8
Q

What is time to stop

A

0.12 sec the time from when the gun receives the signal to stop until mechanical actions begin to stop

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9
Q

What two types of internal finishes does the ribbed barrel have

A

Nitride and chrome

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10
Q

What internal finishing is required for the enhanced gun

A

Chrome

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11
Q

What are the features of the enhanced receiver

A

Larger breech assembly, longer recoil, triple spring drive clutch and a BIT ready gun drive motor

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12
Q

What are the features of the enhanced feeder

A

Quick detachable link covers and a BIT ready feed select solenoid

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13
Q

What are the components of the forward feed section

A

Forward feed assembly, Upper feed sprocket assembly, lower feed sprocket assembly, round positioner assembly, feeder assembly rotor, ejection chute

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14
Q

What strips HE rounds from the links and places them in the feeder assembly

A

Lower feed sprocket assembly

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15
Q

What is the purpose of the round positioner assembly

A

Guides and positions the rounds during transfer from the sprocket assembly to the feeder assembly rotor

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16
Q

Sub assemblies of the receiver assembly

A

Barrel support assembly, Recoil Mechanism, Breech assembly, Sear, Sear catch assembly, Sear retractor assembly, mechanical interlock, Direct Current motor, Handle Pin, Electrical Sear solenoid, Riveted Reciever

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17
Q

What are the components of the electrical system

A

1.0 Horse Power 24 VDC motor, Sear solenoid, electrical feed select solenoid and index drive cable assembly

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18
Q

The interlock crank, Rocker assembly, and Sear Pushrod, are components of what

A

Mechanical Interlock

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19
Q

What is the peak recoil force of the M242

A

9,000lbs Enhanced 12,000 Standard

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20
Q

As the bolt completes the ram cycle what happens

A

The cam indent reaches the roller on the breech lock sensor arm

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21
Q

List the steps in the cycle of operation in order

A

Sear, Feed, Ram, Lock, Fire, Unlock, Extract, Eject

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22
Q

The 2 ring spring set is part of what component

A

Recoil Mechanism

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23
Q

In a malfunctioning weapon how much of the gun stopping power does the Sear assemble provide

A

100%

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24
Q

What is the primary function of Sear

A

To positively position the roller assembly chain master link at the end of the firing burst, thereby orienting the gun components for feed selection

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25
Q

What occurs during feed dwell

A

The master link slider moves from left to right in the carrier slider path during the feeder assembly rotor will rotate 1/3 of a revolution during this rotation the rotor will sweep the spent case off the bolt face positioning a new round on the bolt face the firing pin is not cocked and the BPI arrow is rotating through feed/ do not remove feeder

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26
Q

How much overlap is there to prevent a new round from being fed into the breech

A

12.7mm normally 2.5 in the event of a failed cartridge ridge

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27
Q

For the M242 to continue to function, normal gun functioning must occur within what amount of time

A

30 miliseconds

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28
Q

In a malfunctioning weapon the Sear assembly provides 100% of the guns stopping power by stopping what

A

The Roller assembly chain safety link

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29
Q

As the bolt assembly continues forward for the last 14.2mm of travel what happens

A

The firing pin spring is compressed

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30
Q

What is the last measurement of movement of the firing pin as the firing pin spring is compressed

A

14.2mm

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31
Q

When is the bolt at its most rearward position

A

Feed dwell

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32
Q

How far rearward is the bolt from Sear when it is in feed dwell

A

25mm

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33
Q

What are the purposes of the muzzle brake

A

Countering some explosive recoil force, Disperses muzzle blast and reduces blast flash

34
Q

How much recoil is needed to deactivate the rocker assembly

A

12mm minimum, 14mm Typical, 18mm Maximum

35
Q

What do continuous rim guide and the positive T slot extractors ensure throughout the entire gun cycle

A

Continuous control of the round position

36
Q

What two things occur once the normal shutdown sensor has been activated

A

Power is withdrawn completely from the electrical Sear solenoid and power is also shunted from the 1.0 HP VDC motor

37
Q

What failure modes have been identified which represent all modes where the gun WILL CONTINUE TO FUNCTION WITHOUT HANGFIRE PROTECTION

A

Push rod extension or externally relieved screw breaks. Bolt carrier cam pin breaks. Sear assembly breaks. Interlock crank breaks. Electrical Sear solenoid intermittent

38
Q

The micro switches are joined together by what

A

The micro switch sensor harness assembly

39
Q

What occurs during fire dwell

A

Slider moves from right to left in the carrier slider path allowing time for the hot propellant gases escape and chamber pressure to return to safe level prior to unlocking the bolt bpi arrow is rotating through fire poly is making its final locking position

40
Q

How much force does the firing pin spring deliver to the primer

A

32 inch pounds

41
Q

How much coverage do the t slot extractors provide

A

30 degrees on top 75 on bottom 105 degrees of over all coverage

42
Q

What does the 1.0 Hp VDC drive motor assembly provide

A

Ammunition feeding, loading and firing, extraction, and ejection

43
Q

What is the second purpose of the Sear

A

To locate receiver components for proper time of the feed and receiver during assembly

44
Q

Approximately how much recoil is absorbed by the recoil mechanism

A

Approximately 85%

45
Q

How far back can the link slingers move a long round

A

9.5mm

46
Q

What voltage range does the M242 electrical system operate on

A

18-28VDC

47
Q

What are the components of the MSIS

A

Rocker Assembly, Operating Rod Assembly, Interlock Crank, Push rod extension, Sear Pushrod

48
Q

What does the electrical system consist of

A

1.0 HP 24 VDC motor, Electrical Sear Solenoid, Electrical feed Select Solenoid, Index drive cable assembly

49
Q

What two components ensure continuous control of the round positioner Through the entire gun cycle

A

Positive t slot extractors and rim guide

50
Q

In a normally functioning gun what activated the gun shutdown sequence

A

Normal shutdown sensor

51
Q

As the bolt completes the ram cycle, the cam indent reaches the roller and activates and deactivates what microswitch

A

Breech lock sensor

52
Q

What is the M242 power transmission system comprised of

A

1.0 HP 24 VDC motor, feeder drive assembly, chain and bolt drive

53
Q

Dynamic breaking in a normally functioning gun accounts for how much of the guns stopping power

A

80-85%

54
Q

The recoil mechanism is comprised of what

A

Two ring spring set and hydronic damper

55
Q

Ammunition feeding, loading and firing, extraction, and ejection are all done by what component

A

1.0HP 24 VDC motor

56
Q

In a malfunctioning gun what provides 100% of the gun stopping power

A

sear assembly

57
Q

The microswitches that are joined together by the microswitch harness assembly are arranged around what component

A

Control cam

58
Q

What is the desperation of rounds for the M242

A

.5mil (1m diameter at 1000m)

59
Q

How much stopping power does the Sear assembly account for in a normally functioning gun

A

15-20%

60
Q

How far can the link aligners move short and long rounds

A

Long 9.5mm back short 3.1mm forward

61
Q

When is the firing pin compressed

A

As the bolt assembly continues forward for the last 14.2mm of its travel

62
Q

What collects, processes and sends appropriate signals to the traverse drive assembly the elevation actuator and control display assembly

A

Gun turret drive electronics

63
Q

When in fine lay the turret moves how many mils each full rotation

A

10 mils

64
Q

When in course lay the turret moves how far with each full rotation

A

60 mils

65
Q

What does the upper drive assembly providing the final traverse drive gear engage

A

442 gear teeth

66
Q

What does the Arm/Safe switch do

A

Controls arming and sanding of the weapon system

67
Q

When does the low ammo indicator illuminate

A

37 rounds for AP 31 rounds for HE and 100 for Coax

68
Q

The ELRF/DVO is equipped with what magnification direct view optic

A

8X

69
Q

What does TMI do

A

Updates the thermal system to denote movement in the scene

70
Q

STARE is best used when

A

The vehicle is stationary traversing or elevating the turret will cause video smearing to be seen in the display

71
Q

Who must have a fundamental understanding of the procedures and theory involved with the operation of the LAV-25A2 turret equipment in order to effectively utilize the equipment

A

Cremen

72
Q

Describe weapon power circuit breaker

A

Applies power to the weapon and vent blower

73
Q

What is the description of the range button

A

When depressed will electronically activate the ELRF and update the ballistics solution

74
Q

What adjusts the position of the ballistic sight reticle to allow zeroing of the sight and weapon system

A

Deflection and elevation knobs

75
Q

When faults are active the STAB AZ indicator light and the STAB EL indicator light will make a series of flashes and form a two digit what

A

Fault code

76
Q

How do you null drift when the STAB AZ and EL indicators do not flash a fault sequence

A

Depress the palm switch for 10 seconds without any Hand Control deflection

77
Q

What is located between the gunner and commander provides turret crew with controls and annunciators for the fire control system

A

Control diasplay assembly

78
Q

When does the low battery indicator flash

A

When the voltage has fallen below 19.5 volts

79
Q

What does the Grenade launcher group consist of

A

3 switches and one indicator light

80
Q

What fire control modes does the reticle switch have

A

Normal and stadia

81
Q

How does the CDA identify a fault condition

A

By flashing the temperature/ Fault indicator

82
Q

When set to LACE how does the system operate

A

In a

Master Gunner 3-19 (4 decks)

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