Perform Safety Checks on an M252 81-mm Mortar

Task 071-086-0004

Conditions

Given a mounted M252 81mm mortar complete with sight.

Standards & Safety

Make the safety checks to ensure the mortar is safe to fire.
Be careful with the sight, it contains Tritium gas that is radio active.

Training/Evaluation

Training Information Outline

1. Check for mask and overhead clearance as follows:

  a. To determine mask clearance, lower the barrel to 0800 mils elevation and sight along top of the barrel with eye near baseplate.

  b. To determine overhead clearance, raise barrel to 1500 mils elevation and sight along top of the barrel with eye near baseplate.

     NOTE: If full range of elevation cannot be obtained, raise or lower barrel until rounds clear obstruction, turn elevation knob on sight until bubble is level, read the elevation, and report it to the squad leader who, in turn, reports it to the FDC.

2. Check mortar to ensure:

  a. The barrel is locked to the baseplate, and the open end of the socket cap is pointing in the direction of fire.

  b. The firing pin recess is facing upward.

  c. The bipod locking latch is locked, securing the barrel clamp.

  d. The leg-locking handwhell is tight.

Evaluation Preparation

Setup: At the site, provide a mounted M252 81mm mortar complete with sight.

Brief Soldier: Tell the soldier that, using the mortar provided, he must perform safety checks.

Evaluation Guide

PERFORM SAFETY CHECKS ON AN M252 81-MM MORTAR--071-086-0004
Performance Measures		Results
	The following requirements must be met to perform safety checks on an M252 81-mm mortar.
1.	Checks mask on overhead clearance.	P	F
2.	Checks the barrel to ensure that it was locked to the baseplate and the open end of the socket cap was pointing in the direction of fire.	P	F
3.	Checks the firing pin recess to ensure it is facing upward.	P	F
4.	Checks the bipod locking latch to ensure that it is locked, securing the barrel clamp.	P	F
5.	Checks the leg-locking handwheel to ensure it is tight.	P	F

Feedback

Score the soldier a GO if all steps are passed (P).
Score the soldier a NO-GO if any step(s) are failed (F).
If the soldier fails any step(s), show what was done wrong and how to do it correctly.

References

TM 9-1015-249-10

NAVIGATION SECTION

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