Flash and Sound Signal M74

General: The Flash and Sound Signal M74 is designed for simulation of air burst of ar-tillery fire in training troops. It is fired from the Hand Projector M9 or the Pyrotechnic Pis-tol AN-M8.

Description: The signal consists of an outer case, an expelling charge, and an inner cylindrical case containing the delay fuze and bursting charge. The outer case resembles those of the aircraft double-star type. A percussion primer in the base of the outer case extends into the expelling charge. The expelling charge sets off the delay fuze.

Operation: When fired, the primer ignites the expelling charge. This ignites the delay fuze and propels the inner case out of the outer case. After a delay of about two and a half seconds, the fuze ignites the burster charge which, in exploding, produces a bright flash and a loud noise.

Remarks: With the pistol or projector at 45° elevation, the signal will reach a height of about 100 feet for its burst. Helmets should be worn by exposed personnel.