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Weapon systems > Employment/M252A1 > Flashcards

Employment/M252A1 Flashcards

1
Q

When do you swab the tube?

A

Every 10 rounds or upon completion of fire mission.

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2
Q

How much does the M253 81MM cannon weigh?

A

30.5lbs

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3
Q

How much does the M3A2 baseplate weigh?

A

23lbs

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4
Q

How much does the M67 Sight unit weigh?

A

2.9lbs

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5
Q

What is the elevation range of the M252A1 81MM cannon?

A

0800 mils to 1511 mils

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6
Q

How many mils per turn on the elevation and traversing handwheel?

A

10 mils

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7
Q

How many mils right or left of center on the M177A1 mortar mount?

A

100 mils

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8
Q

Minimum and maximum range for the M252A1 81MM cannon?

A

Minimum- 83m

Maximum- 5608m

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9
Q

What are the rates of fire for the M252A1 81MM cannon?

A

Sustained- 15rpm

Maximum- 30rpm for 2 min.

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10
Q

What is the nomenclature for the aiming stakes and lights?

A

M14 aiming sights

M65 aiming lights

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11
Q

What are the 3 employment techniques?

A

By Platoon, section, or squad

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12
Q

What are the 3 methods or Reconnaissance?

A

Map
Air
Ground

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13
Q

What are the firing position selection factors?

A 
Mission accomplishment 
Tactical situation
Target area coverage 
Range
Routes
Survivability 
Surface conditions 
Communications
Overhead and mask clearance
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14
Q

When mortars are positioned then need to be able to cover what percentage of their range?

A

1/2 to 2/3

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15
Q

What are the 3 types of occupation?

A

Deliberate
Hasty
Emergency

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16
Q

The BC or CO controls the displacement of the mortar platoon in what two ways?

A

He can direct the option to displace on order. Which is the most restrictive way.

He can direct the mortar platoon to displace whenever certain predetermined events occur

17
Q

When is displacement by platoon used?

A

When there is little immediate likelihood of enemy contact or when artillery can provide adequate support during displacement.

18
Q

What is a parallel formation?

A

It has the mortars on line. The distance between mortar positions is the bursting diameter of HE ammunition for the particular mortar employed.

19
Q

What is the bursting diameter for the 81MM HE?

A

40m

20
Q

What are the 3 displacement techniques?

A

Displacement by platoon, section, or squad.

21
Q

What is the magnification and field of view for the M67 Sight unit?

A

4x

10 degrees

22
Q

What is a M2 compass capable of reading?

A

Magnetic and grid direction as well as elevation and depression

23
Q

How is the Angle of Site mechanism graduated on the M2 compass?

A

0-1200 in two directions. Graduated in 20 mil increments and numbered every 200 mils

24
Q

What is the range of the azimuth scale?

A

0-6400 mils in 20 mil increments

25
Q

What are the 3 types of rounds for the M252A1 81MM?

A

HE
ILLUM
Smoke with RP/WP

26
Q

What color are HE, ILLUM, and Smoke rounds?

A

HE- OD Green
ILLUM- White with black writing
Smoke- Light green

27
Q

What type of round is a M816 and what fuse does it use?

A

IR Illumination

M772 MTSQ

28
Q

What type of round is a M819 and what fuse does it use?

A

Smoke, RP

M772 MTSQ

29
Q

What type of round is a M821/821A1 and what fuse does it use?

A

HE

M734 Multi-option

30
Q

What type of round is a M853 and what fuse does it use?

A

Illumination

M772 MTSQ
M768 Time

31
Q

What type of round is a M879 and what fuse does it use?

A

FRTC- Full Range Training Cartridge

M751 PD

32
Q

What type of round is a M880 and what fuse does it use?

A

SRTC- Short Range Training Cartridge

M775 PD (Practice)

33
Q

What type of round is a M889/889A1 and what fuse does it use?

A

HE

M935 PD

This fuze is moving out of circulation

34
Q

What is the purpose of the obdurating ring?

A

Expands upon ignition forming a seal between the round and tube

35
Q

What are the 6 different types of fuze settings?

A

PD- Point Detonating
IMP- Impact
SQ- Super Quick

NSB- Near surface burst
PROX- Proximity
DLY- Delay

36
Q

What two settings are available on the M935 fuze?

A

SQ or DLY

37
Q

What settings are available on the M734 fuze?

A

PROX
NSB
SQ
DLY

38
Q

How far off the ground does PROX detonate?

A

1-3m

39
Q

When should the aiming circle be declinated?

A

When it is moved 25 miles or more from the area it was declinated

After an electrical storm or after receiving a severe shock

Every 30 days

When it is initially received and when it is returned from support maintenance repair

Weapon systems (15 decks)

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