M240B TC 3-22.240 Flashcards
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Questions and Answers

What is the weight of the M240B?

27.1 pounds

What Field Manual covers the M240B?

TC 3-22.240

Describe the M240B.

The M240B is a gas-operated, belt-fed, air-cooled, fully automatic weapon that fires from the open-bolt position.

What is the sustained rate of fire for the M240B?

<p>100 rounds per minute</p> Signup and view all the answers

What is the rapid rate of fire for the M240B?

<p>200 rounds per minute</p> Signup and view all the answers

What is the cyclic rate of fire for the M240B?

<p>650 to 950 rounds per minute</p> Signup and view all the answers

What is the maximum range of the M240B?

<p>3725 meters</p> Signup and view all the answers

What is the maximum effective area of the M240B with tripod?

<p>1800 meters</p> Signup and view all the answers

What is the maximum effective range of the M240B for a point target?

<p>800 meters</p> Signup and view all the answers

What is the tracer burnout for the M240B?

<p>900 meters</p> Signup and view all the answers

What types of ammunition can be used with the M240B? (Select all that apply)

<p>M63 - Dummy</p> Signup and view all the answers

What are the proper clearing procedures for the M240B?

<p>Fire position, bolt to rear, place on safe, raise cover assembly, conduct four-point safety check, check feed tray, lift feed tray and inspect chamber.</p> Signup and view all the answers

What are the proper procedures for performing a function check on the M240B?

<p>Place safety on 'F', pull cocking handle to rear, then trigger. Safety on 'S', check. Safety on 'F', pull trigger.</p> Signup and view all the answers

What is the name of the 240's tripod?

<p>M122A1 tripod</p> Signup and view all the answers

What is meant by traversing fire?

<p>Adjusting fire to the left and right while on tripod</p> Signup and view all the answers

What is meant by searching fire?

<p>Adjusting fire up and down while on tripod</p> Signup and view all the answers

What is meant by grazing fire?

<p>When you have a cone of fire that is at no point higher than 1 meter off the ground</p> Signup and view all the answers

What is meant by plunging fire?

<p>When you are firing from high grounds to low grounds</p> Signup and view all the answers

What is meant by oblique fire?

<p>When the long axis of the beaten zone is at an angle other than a right angle to the front of the target</p> Signup and view all the answers

What is meant by enfilade fire?

<p>When the long axis of the beaten zone coincides with the long axis of the target</p> Signup and view all the answers

What are the 8 major groups of the M240?

<p>Barrel assembly, cover assembly, butt stock assembly, receiver assembly, trigger assembly, operating rod assembly, bolt assembly, driving spring rod assembly</p> Signup and view all the answers

What are the 4 rules of firearm safety? (Select all that apply)

<p>Treat every weapon as if it is loaded</p> Signup and view all the answers

Does the M240B have an Amber Status?

<p>False</p> Signup and view all the answers

Describe the Green status for the M240B.

<p>The bolt is locked forward and the fire/safe selector switch is on fire (F).</p> Signup and view all the answers

Describe the Red status for the M240B.

<p>The machine gun ammunition is loaded onto the feed tray, bolt is open and locked to the rear.</p> Signup and view all the answers

Describe the Black status for the M240B.

<p>The machine gun ammunition is loaded on the feed tray, the bolt is locked to the rear, the selector switch is set to fire.</p> Signup and view all the answers

The phases of the cycle of function in order are: _____

<p>Feeding, Chambering, Locking, Firing, Unlocking, Extracting, Ejecting, Cocking</p> Signup and view all the answers

What are the CYCLE OF FUNCTION?

<p>The mechanical process a weapon follows during operation</p> Signup and view all the answers

What is COOLING?

<p>The process of dissipating heat from the weapon during firing</p> Signup and view all the answers

Study Notes

M240B Overview

  • Weight of the M240B is 27.1 pounds.
  • Current Field Manual is TC 3-22.240, published on April 28, 2017.

M240B Characteristics

  • Gas-operated, belt-fed, air-cooled, fully automatic weapon.
  • Fires from the open-bolt position and supports optics and equipment through standardized mounting surfaces.

Rates of Fire

  • Sustained rate: 100 rounds per minute in bursts of 6 to 9 rounds; barrel change every 10 minutes.
  • Rapid rate: 200 rounds per minute in bursts of 10 to 13 rounds; barrel change every 2 minutes.
  • Cyclic rate: 650 to 950 rounds per minute in continuous bursts; barrel change every minute.

Ranges and Ammunition

  • Maximum range: 3725 meters.
  • Maximum effective area (with tripod): 1800 meters.
  • Maximum effective range for point target: 800 meters.
  • Tracer burnout distance: 900 meters.
  • Compatible ammunition types: M80 (Ball), M61 (Armor Piercing), M62 (Tracer), M63 (Dummy), M82 (Blank).

Clearing and Function Check Procedures

  • Proper clearing involves placing the weapon in fire position, conducting checks for ammunition, inspecting the chamber and parts, and ensuring the weapon is safe before pulling the trigger.
  • Function check requires ensuring safety positions, testing trigger response, and confirming bolt functionality.

Tripod and Fire Types

  • M240B is mounted on the M122A1 tripod.
  • Fire types include:
    • Traversing fire: adjusting left and right.
    • Searching fire: adjusting up and down.
    • Grazing fire: fire cone stays under 1 meter off the ground.
    • Plunging fire: firing from high to low ground.
    • Oblique fire: angled fire relative to the target.
    • Enfilade fire: long axis of beaten zone aligned with the target.

Major Groups of the M240B

  • The M240B consists of eight major components:
    • Barrel assembly
    • Cover assembly
    • Butt stock assembly
    • Receiver assembly
    • Trigger assembly
    • Operating rod assembly
    • Bolt assembly
    • Driving spring rod assembly

Firearm Safety Rules

  • Treat every weapon as if it is loaded.
  • Never point the weapon at anything you do not intend to destroy.
  • Keep your finger off the trigger until ready to fire.
  • Ensure positive identification of the target and its surroundings.

Status Indicators

  • Amber status: The M240 does not have an amber status.
  • Green status: Bolt locked forward, fire selector on fire, feed tray closed.
  • Red status: Ammunition loaded, bolt open and locked rear, fire selector on safe.
  • Black status: Ammunition loaded, bolt locked rear, selector on fire, finger on trigger ready to engage.

Cycle of Function

  • Phases include feeding, chambering, locking, firing, unlocking, extracting, ejecting, and cocking.
  • Cycle of function describes the mechanical processes during weapon operation.

Cooling

  • Cooling refers to the dissipation of heat from the weapon during firing to maintain operational efficiency.

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Description

Test your knowledge on the M240B machine gun with this quiz based on TC 3-22.240. Learn about its weight, field manual, and technical specifications. Perfect for military personnel or defense enthusiasts looking to reinforce their understanding of this weapon system.

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