M106A2 and (Obsolete) M106, M106A1, and M106 (Long) (Tail Mechanical Impact Pyrotechnic Delay)

Bombs

Functioning

Armed condition

Fuzes used with

Arming time

Body diameter, inches

Over-all lenght, inches

Material

Cadmium-plated steel except percussion cap housing, which is brass

General: This fuze is dangerous to handle if the arming pin is out, because it has a heavy striker and a weak creep spring. This fuze should never be used for horizontal, glide, or dive bombing if there are any fuzes of the AN-M100 series available. It should never be used for skip or masthead bombing if there are any fuzes of the M112A1 or M115 series available.

Operation: Upon withdrawal of the arming wire from the arming pin, the arming pin is ejected by its spring. The only thing preventing the heavy striker from impinging on the primer at this point is the weak creep spring. Upon impact, the striker block overcomes the creep spring, the firing pin impinging on the primer. The flame from the primer ignites the primer pellet, which, in turn, ignites the short length of safety fuse which is coiled in the fuze body. The oppostie end of the safety fuse is primed with the detonator pellet of black powder, which insures the functioning of the upper detonator and lower detonator when the safety fuse has burned its entire length.

Early design: The M106 had a longer coil of safety fuse, with a functioning time of 45 to 60 seconds. The M106A1 had a reduced functioning time of 8 to 11 seconds, for masthead bombing. M106, Long, was used in the Modified Mark series 2,000-lb. G.P. bomb, havin an over-all length of 31.3 inches.

Remarks: If any of these fuzes are found in storage or elsewhere in an unarmed con-dition, they should be carefully checked to ascertain that the wire clip preventing the arming pin from being ejected by its spring is in good condition and not rusted or weak. Should this clip or wire rust through and give way, the arming pin would pop out, leaving the fuze in a dangerous armed condition.

The bureau of Ordnance has decreed that all these fuzes encountered in naval activities be disposed of by dumping in deep water.

Figure 332. Tail Fuze M106