Equipment 40 mm L70 Gun AAE1

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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