NATO AEP-55
STANAG 4569

Protection Levels for Occupants of Logistic and Light Armoured Vehicles

(Updated 7 May 2014)

References

NATO AEP-55 PROCEDURES FOR EVALUATING THE PROTECTION LEVEL OF LOGISTIC AND LIGHT ARMOURED VEHICLES, Volume 1 (February 2005) (1.34 MB PDF)
PROCEDURES FOR EVALUATING THE PROTECTION LEVELS OF LOGISTIC AND LIGHT ARMOURED VEHICLES FOR KE AND ARTILLERY THREATS (NATO, January 2004 Draft) (Original DOC format, PDF Format)

Definition of Protection: Based on ballistic material providing a 90% probability of protection from the threat (established by STANAG 4164).

Fragment Simulation Projectile (FSP)

(Drawing of Fragment Simulation Projectile with Dimensions – PNG)

12.7mm FSP: 13.4 grams (+/- 0.13 grams)
20mm FSP: 53.8 grams (+/- 0.26 grams) (Mandatory for Protection Levels 4 and 5)

Threat Level 1 (Rifle)

Artillery Simulator: 20mm FSP (simulating 155mm threat) at 520 m/sec from a distance of 100 meters (7,273J). Due to very low probability of a large fragment retaining enough velocity at these distances, STANAG 4569 makes this optional.
Ammunition: 5.56mm x 45 M193 Ball
Distance: 30 meters
Projectile Weight: 3.56 grams
Velocity: 937 m/sec
Energy: 1,563 Joules
Ammunition: 5.56mm x 45 SS109 (M855) (DM11) (NATO)
Distance: 30 meters
Projectile Weight: 4 grams
Velocity: 900 m/sec
Energy: 1,620 Joules
Ammunition: 7.62mm x 51 M80 Ball (NATO)
Distance: 30 meters
Projectile Weight: 9.5 grams
Velocity: 833 m/sec
Energy: 3,296 Joules

Threat Level 2 (Infantry Rifle)

Artillery Simulator: 20mm FSP (simulating 155mm threat) at 630 m/sec from a distance of 80 meters (10,676J). Due to very low probability of a large fragment retaining enough velocity at these distances, STANAG 4569 makes this optional.
Ammunition: 7.62mm x 39 API BZ
Distance: 30 meters
Projectile Weight: 7.77 grams
Velocity: 695 m/sec
Energy: 1,877 Joules

Threat Level 3 (Sniper Rifle)

Artillery Simulator: 20mm FSP (simulating 155mm threat) at 770 m/sec from a distance of 60 meters (15,949J). Due to very low probability of a large fragment retaining enough velocity at these distances, STANAG 4569 makes this optional.
Ammunition: 7.62mm x 54R B32 Armor Piercing-Incendiary
Projectile Weight: 10 grams
Distance: 30 meters
Velocity: 854 m/sec
Energy: 3,647 Joules
Ammunition: 7.62mm x 51 AP M993 (WC Core)
Projectile Weight: 8.4 grams
Distance: 30 meters
Velocity: 930 m/sec
Energy: 3,633 Joules

Threat Level 4 (Heavy Machine Gun)

Artillery Simulator: 20mm FSP (simulating 155mm threat) at 960 m/sec from a distance of 25 meters (24,791J).
Ammunition: 14.5mm x 114 B32 Armor Piercing-Incendiary
Distance: 200 meters
Projectile Weight: 63.4 grams
Velocity: 911 m/sec
Energy: 26,308 Joules

Threat Level 5 (Automatic Cannon)

Artillery Simulator: 20mm FSP (simulating 155mm threat) at 960 m/sec from a distance of 25 meters (24,791J).
Ammunition: 25mm x 137 APDS-T PMB 073
Distance: 500 meters
Projectile Weight: 121.5 grams (W alloy)
Velocity: 1,258 m/sec
Energy: 96,140 Joules