M240B TC 3-22.240 Quiz & Flashcards

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?

100 rounds per minute Signup and view all the answers

What is the rapid rate of fire for the M240B?

200 rounds per minute Signup and view all the answers

What is the cyclic rate of fire for the M240B?

650 to 950 rounds per minute Signup and view all the answers

What is the maximum range of the M240B?

3725 meters Signup and view all the answers

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

1800 meters Signup and view all the answers

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

800 meters Signup and view all the answers

What is the tracer burnout for the M240B?

900 meters Signup and view all the answers

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

M63 - Dummy Signup and view all the answers

What are the proper clearing procedures for the M240B?

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. Signup and view all the answers

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

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

What is the name of the 240's tripod?

M122A1 tripod Signup and view all the answers

What is meant by traversing fire?

Adjusting fire to the left and right while on tripod Signup and view all the answers

What is meant by searching fire?

Adjusting fire up and down while on tripod Signup and view all the answers

What is meant by grazing fire?

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

What is meant by plunging fire?

When you are firing from high grounds to low grounds Signup and view all the answers

What is meant by oblique fire?

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

What is meant by enfilade fire?

When the long axis of the beaten zone coincides with the long axis of the target Signup and view all the answers

What are the 8 major groups of the M240?

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

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

Treat every weapon as if it is loaded Signup and view all the answers

Does the M240B have an Amber Status?

False Signup and view all the answers

Describe the Green status for the M240B.

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

Describe the Red status for the M240B.

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

Describe the Black status for the M240B.

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

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

Feeding, Chambering, Locking, Firing, Unlocking, Extracting, Ejecting, Cocking Signup and view all the answers

What are the CYCLE OF FUNCTION?

The mechanical process a weapon follows during operation Signup and view all the answers

What is COOLING?

The process of dissipating heat from the weapon during firing 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.

M240B TC 3-22.240 Flashcards