Figure 1-16.—Suspension lug installation

spaced 14 or 30 inches apart, depending upon the size of the bomb. Suspension lugs (fig. 1-16) are used to attach the weapon to the aircraft bomb racks. An internally threaded well for the installation of a hoisting lug is located between the suspension lugs, at the center-of-gravity (CG) position on the bomb. The hoisting lug is used for handling purposes only. REVIEW NUMBER 4 ANSWERS A1. All electric capability for Mk 80 with either conical or retarding fins, thermally protected bombs, and laser-guided bombs is provided by the Mk 376 electric bomb fuzes. A2. No unusual RADHAZ precautions are taken when using the Mk 376 fuze because it is classified as HERO SAFE. A3. The Mk 376 electric fuze and FMU 139 are used for retarded delivery of the Mk 80 (series) bomb. A4. The functions of the Mk 31 safety device are to adapt the fuze to the fuze well of the bomb, mechanically safe the fuze, and to unlock the timer-decelerometer. A5. The Mk 122 Mod 0 arming safety switch is used to open a circuit and provide a RADHAZ shield to prevent electromagnetic radiation from entering the fuze circuits. A6. The Mk 43 Mod 0 target-detecting device is used to provide airburst capability for electrically fuzed Mk 80 bombs. A7. A thermal battery, initiated by a +300 volts dc or striker rod, is used to power the internal circuitry of the TDD. 1-19 Figure 1-16.—Suspension lug installation.