Equipment 40 mm L70 Gun AAE1
This is a mobile light anti-aircraft weapon to engage and destroy low flying attacks by fighter aircrafts. The chief characteristics are high speed of traverse and elevation with a high rate of fire. These are achieved by incorporating various devices such as electrohydro servo mechanism automatic loader and high velocity ammunition. The rate of fire is 300 rds/minute.
 
TECHNICAL DATA
The technical data in general are as under :-
Rate of fire 240 rds/min
(300 rds/min improved version)
(continuous Automatic)
Muzzle velocity 1000 M/s (3281 ft/s)
Max horizontal range 12,600 M (13,780 yards)
Recoil time 0.07 seconds
Run-out time 0.18 seconds
ORDNANCE
Calibre 40± .05 mm (1.575 ± 0.002 in)
Length of barrel 2800 mm (110.24 in)
Length of chamber 376.2 mm (14.811 in)
RIFLING
Type Polygrove plain section modified length of rifled part -
2423.8 mm (95.425 in)
Number of grooves 16
Width of groove 5.6± .3 mm (.2205±.0118 in)
Max. gas pressure 3250 Kg/cm 2(20.6 ton/in 2 )
Min. gas pressure 2750 Kg/cm 2 (17.4 ton/in 2 )
BUFFER
Type Hydraulic, tapered control rod
Liquid Alternatively Fluid AL - 17 to Specn (Pt.No. IAA - 1066)
Length of recoil Normal - 230 mm (9.96 in)
Maximum 250 mm (9.847 in)
Minimum 190 mm (7.484 in)
Breech Mechanism
Type Vertical sliding breech block
Method of operation automatic
Firing Mechanism percussion type
Striker protrusion Min. 2.44 mm (0.945 in)
Max. 3.00 mm (0.1181 in)
MOUNTING
Number of rounds in ammunition rack 48
Elevation limits - 5 to + 90 degrees
Field of traverse 360 degrees
Power Operation
Maximum elevating speed 45 degrees/s
Maximum traversing speed 85 degrees/s
Maximum elevation acceleration 135 degrees/ s 2
Maximum traversing acceleration 127 degrees/ s 2
Hand Operation
Gear ratio elevation 8 degrees/ per turn of hand crank
Gear ratio elevation 10 degrees/ per turn of hand crank
Max Crank force 8 Kg (17.64 lb)
Fire limiting gear (For electrical firing only)
Elevation setting - 5 to 50 degrees
Traverse setting 0 to 360 degrees
Power Gear- variable speed gear Oil pressure in hydraulic system
Max. pressure oil system 20 Kg/ Cm 2 (285 lb/in 2 )
Replenishing flow system 6 Kg/ Cm 2 (85 lb/ in 2 )
 
Contact :
Marketing & Export Division
Ordnance Factory Board
Ayudh Bhawan
Government of India
Ministry of Defence
10A, S. K. Bose Road, Kolkata – 700 001, India.

Tel: 0091-33-2248 9027 / 2248 2103 / 2248 5077-80
Fax : 0091-33-2248 1748/2210 8235
Mail : ofbtrade@dataone.in
www.ofb.gov.in