Description
Practice bomb signal Mk 7 Mod 0 consists of a can of black powder fitted with inert fuze AN-Mk 247 Mod 0 and a blank .38-caliber cartridge which is used as a detonator. Signal Mk 7 is used with; practice bombs for observation of bombing accuracy.
The Mk 7 is generally the same as the Mk 6 except that the fuze is mounted off center in the Mk 6 and its black powder filling weighs about 1 pound more.
Functioning
Upon release from the plane, the arming wire is withdrawn, permitting the fuze arming vane to rotate and arm the signal. Upon impact of the bomb, the firing pin in the fuze overcomes a creep spring and impinges upon the primer of the blank cartridge which, in turn, ignites the black powder charge. The resulting explosion produces a flash of light and a large puff of gray smoke.
Hazardous Components
Black powder, 1 lb
See Also
Source(s)
TM 9-1325-200, Bombs and Bomb Components (1966)
OP 2216, Volume 1 - Aircraft Bombs, Fuzes, and Associated Components (1960)
OP 1664, Volume 1 - US Explosive Ordnance (1947)
