Area Weapon System

Question 0

M789 penetration at 500; 2500; and 3000 meters:

Answer 0

500: 1.5 inches
2500: in excess of 2 inches
3000: 3 inches

Question 1

Nominclature of dummy, target practice, and HEDP rounds:

Answer 1

Dummy: M848
TP: M788
HEDP: M789

Question 2

M789 nominal burst radius:

Answer 2

4 meters

Question 3

30mm engagements beyond _______ can be heard by dismounts before rounds impact.

Answer 3

2,000 meters

Question 4

30mm rate of fire:

Answer 4

625 +/- 25

Question 5

M789 time of flight (500 to 3000 meters in 500m increments):

Answer 5

500: 0.7
1000: 2.0
1500: 3.7
2,000: 5.8
2,500: 8.6
3,000: 12.2

Question 6

Azimuth and elevation limits of the 30mm gun:

Answer 6

Azimuth: 86 deg l/r of centerline
Elevation: +9 deg (within 10 deg l/r)
+11 deg (from 10 to 86 deg l/r)
-60 deg (-6.45 on squat switch)

Question 7

Missiles (inboard) are selected. What does the WP limit the gun to in azimuth on that side?

Answer 7

52 deg

Question 8

Rockets (inboard) are selected. What does the WP limit the gun to in azimuth on that side?

Answer 8

60 deg

Question 9

Max effective range of the M230E1:

Answer 9

1500 - 1700 meters

Question 10

Max ballistic solution of the M230E1:

Answer 10

4200 meters

Question 11

M230E1 barrel life:

Answer 11

30,000 rounds

Question 12

Gun duty cycle:

Answer 12

The duty cycle is six 50-round bursts with 5 seconds between bursts, followed by a 10- minute cooling period.

Burst settings other than 50, the duty cycle can be generalized to mean that no more than 300 rounds are fired within 60 seconds before allowing the gun to cool for 10 minutes after which the cycle may be repeated.

Question 13

What do you have to do if you exceed the gun duty cycle?

Answer 13

If 300 or more rounds have been fired in the preceding ten minutes, and a stoppage occurs, personnel must remain clear of the aircraft for 30 minutes. Aircraft crewmembers should remain in the aircraft and continue positive gun control.