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M91 Electromechanical fuzes for aircraft bombs

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M91 IMPACT SUPER-QUICK AND DELAYED ACTION FUZE FOR LOW AND HIGH DRAG AIRCRAFT BOMBS

M91 is an electromechanical Impact Fuze of super-quick and delay action used for optimising the performance of aircraft Bombs. The fuze incorporates advanced electronics for maximum safety and flexibility in operation. It can be used either as nose impact or tail fuze for use with either normal bomb tails or retarded bomb tails, such as Mk15 Mod IV “Snake-Eye” or BSU-49 “Ballute”.

Operation Inertia Action as Nose point detonating and Tail Fuze
Safety Selectable Arming Time 2.5 s    
delay action 3.6 s    
delay action 3.6 s supper-quick action
  2 Visual Mechanical safe condition indicators
  Electronic Module activation light
  Electronic out-of-line detonator & antistatic circuit
  Bird Strike Safety
  2 Dual System arming wires
  Incorporates a Retard “G” Force Sensor, monitored by the microcomputer, to ensure correct functioning and braking of high drag tail, if used. Air Sensor used to ensure fuze will not arm if airspeed is less than 220 KTAS
Carriage Envelope Speed : 0 to 600 KTAS
  Altitude : 0 to 40000 feet
  G-Load: -2.5 g to +6g
  Roll Rate : 165 deg/s
Release / Jettison Envelope Speed : 220 to 600 KTAS
  Altitude : 0 to 40000 feet
  G-Load : -1.5 g to +5g
  Dive Release : 45 deg max
Bomb and Interface Standard NATO 2” - 12 UNS thread fits into T45 / M148 Adapter Booster. Arm wire No.10
Environmental Capability MIL-STD-331 and MIL-STD-810
Operational Ambient Temp -40 C to +71 C
Power Source Lithium Batteries
Interference Not affected by smoke or dust. UHF circuitry (frequency agile Dopler) ensures enemy jamming immunity and consistent burst height.
Storage Life 10 years