Mortar
During reciprocal lay, you must be within how many mils to be laid?
0 mil / 1 mil (mortar laid)
What is the max charge a 60mm mortar can be fired handheld?
1 charge.
What is the minimum range of the 120mm mortar syste WITHOUT danger close considerations?
200m
When boresighting you are using the distant aim point method. What is the ideal distance of the aiming point?
200m
How many modes are on the 60mm firing selector and what are they?
3 modes. Safe, Drop & Trigger Fire.
What is the diameter and depth of an 81mm mortar pit?
3-1/2m wide - 1-1/2m deep
What is the maximum rate of fire for 60mm mortar system?
30 RPM
What are the 3 primary refer deflections?
3200, 2800, 0700
What is the sustained rate of fire for the 120mm mortar system?
4 RPM
How many mils is one complete turn of traverse on the 120mm mortar system?
5 mils
What is the max range of fire for the M4?
500m
When boresighting the 81mm mortar, what deflection is placed on the sight?
6400 / 0000
What is the weight of the M191?
68 lbs
What is the maximum range of the 120mm mortar system?
7200m
What is the blast radius of the 120mm mortar?
75m
What is the weight of the M7A1?
9.2 lbs
What is the most recent manual for Tactical Employment of Mortars?
ATP 3-22.90
What is Direct Lay?
Aiming line of sight of target and adjusting based on round landing.
What are the 81mm safety checks?
Firing pin up, Mask / Overhead clear, Locking collar locked, locking nut on bipod leg, center of traverse.
What 3 pieces of information must be present to fire a polar mission?
Grid/position, Distance, Direction
What is the nomenclature of the boresight used for the 81mm and 120mm mortar system?
M45
What is VI? (those are letters, not roman numerals)
Vertical Interval
What gun is used when adjusting a FPF?
Whichever gun is closest to the FPF.
In a 3 gun section which gun is the adjusting gun and why?
2 Gun. It is in the center.
What is the weight of the M64A1 sight unit?
2.9 lbs
What is the sustained rate of fire for the 60mm mortar system?
20 RPM
What is the weight of the M298?
110 lbs
What is the max range of the 60mm mortar system?
1340m
How many mils will one turn of the traverse move that cannon in the lower saddle?
15 mils
How many mils in 1 degree?
17.7 mils
What form is the DA2399?
Computer Record
What fuze setting should be used when firing MCS?
Delay
What 3 pieces of information must be present to fire a Search and Traverse?
Enemy position / Direction of movement / Description
How often should the tube be swabbed?
Every 10 round / End of the Fire Mission
Once the adjusting gun is adjusted, what does the method of fire change to?
FFE (Fire For Effect)
Deflection is always announced when issuing a firing command. True or False?
False
During misfire procedures, once the cannon passes horizontal, the rear of the cannon must not do what until the round is extracted?
Leaned back down.
What are the 5 types of Sheaves?
Linear, Parallel, Special, Converge, Open.
If time and tactical considerations allow it, what is the first mission to be fired?
Registration
During misfire procedures how does the AB assist in releasing the round from the cartridge extractor?
Releases round from extractor.
What publication covers Mortars?
TC 3-22.90
When a misfire occurs on a 60mm mortar system, what is the next thing that happens?
Trigger Fire.
What is the radioactive gas used to illuminate the mortar sight, M58 and M59?
Tritium
What is the maximum rate of fire for the 60mm mortar system in hand held configuration?
There is none.
What is the purpose of the skunk line on the 120mm mortar system?
To align the bipod.