Jump to:
M992
M992A1
M992A2

Field Artillery Ammunition Support Vehicle M9921-5

M992: General
Date of first acceptance July 1984 Total acceptances 675
Manufacturers
  • BMY Combat Systems
  • United Defense L.P.
Crew 3-8 men
M992: Dimensions
Combat weight 57,500lbs
26,100kg		 Height over machine gun mount 127.5"
323.9cm
Length 262.5"
666.8cm		 Width 124"
315cm
Tread 109.0"
276.9cm		 Ground clearance 14.5"
36.8cm
M992: Armament
Type Mount Traverse
.50cal M2HB MG Flexible in AA mount 360°
(manual)
M992: Armor
Assembly
Welding
Hull
Rolled 5083 aluminum alloy
M992: Automotive
Engine General Motors 8V71T; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2,300rpm
Gross: 405@2,300rpm		 Torque Net: 895 ft-lb@1,600rpm
Gross: 980 ft-lb@1,700rpm		 Fuel capacity 135gal
511L
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering wheel (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M992: Suspension
Type Road wheels Track return rollers
Torsion bar 7 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
10-tooth front drive Dual adjustable at rear of track On first and last road wheels/track
M992: Track
T136
Center guide, double pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 79 Ground contact length 156"
396cm
T137
Center guide, single pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 79 Ground contact length 156"
396cm
M992: Performance
Max level road speed 35mph
56kph		 Max trench 72"
180cm
Max grade 60% Max vertical obstacle 21"
53cm
Min turning diameter Pivot Max fording depth 42"
110cm
Cruising range ~220mi, roads
~350km, roads

The M992 was based on the self-propelled howitzer M109A2. The turret was replaced by an armored superstructure used to stow additional howitzer ammunition and fuzes. An auxiliary power unit (APU) provided power for an hydraulic ammunition conveyor and stacker system, and 104 155mm fuzes, 99 propellant charges, and 93 projectiles could be stowed. 175mm, 203mm, 120mm, and 105mm ammunition could also be stowed; for a 203mm howitzer unit 48 projectiles, 53 charges, and 56 fuzes would be the loadout. The conveyor allowed the transfer of up to 8 rounds per minute to the supported howitzer, and the rear door was hinged upwards to provide overhead protection during transfer. The crew during operation was three, but the vehicle could transport a maximum of 8 during transit.

Top

                                                                                    


Field Artillery Ammunition Support Vehicle M992A11,5-8

M992A1: General
Total acceptances 125 Crew 3-5 men
M992A1: Dimensions
Combat weight 57,500lbs
26,100kg		 Height over GPS antenna assembly 143"
363cm
Length 260"
660cm		 Width 124"
315cm
Tread 109.0"
276.9cm		 Ground clearance 15"
38cm
M992A1: Armament
Type Mount Traverse
.50cal M2HB MG Flexible in AA mount 360°
(manual)
M992A1: Armor
Assembly
Welding
Hull
Rolled 5083 aluminum alloy
M992A1: Automotive
Engine General Motors 8V71T; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2,300rpm
Gross: 405@2,300rpm		 Torque Net: 895 ft-lb@1,600rpm
Gross: 980 ft-lb@1,700rpm		 Fuel capacity 135gal
511L
Transmission Allison XTG-411-2A, 4 ranges forward, 2 reverse
Steering Mechanical, steering wheel (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M992A1: Suspension
Type Road wheels Track return rollers
Torsion bar 7 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
10-tooth front drive Dual adjustable at rear of track On first and last road wheels/track
M992A1: Track
T136
Center guide, double pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 80 Ground contact length 156"
396cm
T137
Center guide, single pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 80 Ground contact length 156"
396cm
M992A1: Performance
Max level road speed 35mph
56kph		 Max trench 72"
180cm
Max grade 60% Max vertical obstacle 21"
53cm
Min turning diameter Pivot Max fording depth 42"
110cm
Cruising range ~220mi, roads
~350km, roads

The M992A1 was developed after Operation Desert Storm to support the self-propelled howitzer M109A6 and incorporated changes to propellant stowage and the conveyor system and rear door. Ninety 155mm projectiles and ninety-nine propellant charge containers could now be stowed. The M992A1's crew was 3 during operation and a maximum of 5 during transit. Like the M109A6, its engine was also upgraded to 440 horsepower.

Top

                                                        


Field Artillery Ammunition Support Vehicle M992A21,5,9-10

M992A2: General
Crew 3-5 men
M992A2: Dimensions
Combat weight 57,500lbs
26,100kg		 Height over GPS antenna assembly 143"
363cm
Length 260"
660cm		 Width 124"
315cm
Tread 109.0"
276.9cm		 Ground clearance 15"
38cm
M992A2: Armament
Type Mount Traverse
.50cal M2HB MG Flexible in AA mount 360°
(manual)
M992A2: Armor
Assembly
Welding
Hull
Rolled 5083 aluminum alloy
M992A2: Automotive
Engine General Motors 8V71T; 8 cylinder, 2 cycle, vee, supercharged diesel
Horsepower Net: 345@2,300rpm
Gross: 405@2,300rpm		 Torque Net: 895 ft-lb@1,600rpm
Gross: 980 ft-lb@1,700rpm		 Fuel capacity 135gal
511L
Transmission Allison XTG-411-4, 4 ranges forward, 2 reverse
Steering Mechanical, steering wheel (clutch-brake in 1st, 2nd, 1st reverse; geared steer in 3rd, 4th, 2nd reverse)
Brakes Multiple disc
M992A2: Suspension
Type Road wheels Track return rollers
Torsion bar 7 individually sprung dual/track Flat track
Drive sprockets Idlers Shock absorbers
10-tooth front drive Dual adjustable at rear of track On first and last road wheels/track
M992A2: Track
T136
Center guide, double pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 80 Ground contact length 156"
396cm
T137
Center guide, single pin, steel with detachable rubber pad
Width 15"
38cm		 Pitch 6"
15cm		 Shoes/track 80 Ground contact length 156"
396cm
M992A2: Performance
Max level road speed 35mph
56kph		 Max trench 72"
180cm
Max grade 60% Max vertical obstacle 21"
53cm
Min turning diameter Pivot Max fording depth 42"
110cm
Cruising range ~220mi, roads
~350km, roads

M992A2s were newly built or converted from early M992s or M109A2 and M109A3 hulls, and involved the upgrade to M992A1 standard as well as a better radiator; stronger side-door sponsons; a quick-disconnect for the final drives; moving the personnel heater and hydraulic oil reservoir; improvements to the APU; and reliability, availability, and maintainability (RAM) upgrades. Ninety 155mm projectiles and ninety-six propellant charge containers could be carried. M992A1s were also fitted with these additional features and renamed M992A3.

Top

                                                                             


References

  1. Hunnicutt, R.P. Sheridan: A History of the American Light Tank, volume 2. Navato, CA: Presidio Press, 1995. Reprinted with permission from Sheridan, R.P. Hunnicutt ©1995, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  2. TM 9-2350-267-10 C1 Operator's Manual for Carrier, Ammunition, Tracked M992 (NSN 2350-01-110-4660). Washington, DC: Dept. of the Army, 3 Feb 1997.
  3. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  4. "M992 FAASV Field Artillery Ammunition Supply Vehicle." GlobalSecurity.org. 7 Jul 2011. 4 Jan 2016 <http://www.globalsecurity.org/military/systems/ground/m992.htm>.
  5. Zaloga, Steven J. M109 155mm Self-Propelled Howitzer 1960-2005. Botley, Oxford: Osprey Publishing, 2005.
  6. TM 9-2350-287-10 C1 Operator's Manual for Carrier, Ammunition, Tracked M992A1 (NSN 2350-01-352-3021). Washington, DC: Dept. of the Army, 6 Jun 1997.
  7. TM 9-2350-287-20-1 C1 Unit Maintenance Manual for Carrier, Ammunition, Tracked M992A1 (NSN 2350-01-352-3021). Washington, DC: Dept. of the Army, 6 Jun 1997.
  8. "M992A1 FAASV Field Artillery Ammunition Supply Vehicle." GlobalSecurity.org. 7 Jul 2011. 4 Jan 2016 <http://www.globalsecurity.org/military/systems/ground/m992a1.htm>.
  9. TM 9-2350-293-10 Operator's Manual for Carrier, Ammunition, Tracked, M992A2 NSN 2350-01-368-9500 (EIC: AE2). Washington, DC: Dept. of the Army, 17 Dec 2001.
  10. "M992A2 FAASV Field Artillery Ammunition Supply Vehicle." GlobalSecurity.org. 7 Jul 2011. 4 Jan 2016 <http://www.globalsecurity.org/military/systems/ground/m992a2.htm>.
Last updated 10 Jan 2023.
Questions? Comments? Corrections? Email me
© Copyright 2016-23 Chris Conners