1. Ensure threads are not damaged 2. Install nose plug, tighten with spanner wrench or rachet, and tighten nose setscrew. Electric/Electronic TaiI Fuzes Procedures for inspection and installation of tail fuzes FMU-139 and Mk 376 are the same as for GP bombs, as outlined previously in this chapter. Mk 89 Mod 0 Spotting Charge Adapter Prepare and inspect the Mk 89 spotting charge adapter (fig. 13-16) as follows: 1. Remove tape holding cotter pin with instruction tag attached 2. Remove inertia sleeve and compression safety spring by unscrewing firing pinhead from adapter body. 3. Inspect all components, and reject adapter if any components are damaged. Mk 4 and CXU-3 Cartridge Installation Install signal cartridge in spotting charge adapter as follows: 1. Insert inertia sleeve into cavity body. 2. Slide cartridge through inertia sleeve with cartridge rim against forward end of sleeve. 3. Press blocking pin inward until safety pin presses through the second guide hole, locking blocking pin in place. 4. Insert cotter pin through outer set of holes in head of safety pin and safety pin sleeve. Bend leg of cotter pin slightly to hold in place. 5. Place compression safety spring over firing pin head into adapter body and hand tighten. Mk 89 Spotting Charge Installation Install Mk 89 spotting charge adapter with signal cartridge as follows: 1. Verify bomb tail well is clean. 2. Insert adapter in the same manner as electric fuzes. NOTE: The procedures for inspection and installation of nose fuzes and bomb fins are the same as those discussed previously in this chapter for GP bombs. GUIDED-BOMB UNIT (GBU) ASSEMBLY GBUs are general-purpose bombs configured with a wing assembly and a computer control group. Preparation and inspection of the GBUs are the same as the GP bombs, discussed earlier in this chapter, Wing Assembly Installation Install the wing assembly on the bomb as follows: 1. Ensure safety pins are securely installed in latch release lever and collar assembly (fig. 13-17). 2. Remove access covers. NOTE: Refer to figure 13-18 for steps 3 through 8. 3. lug. 4. loop. 5. Attach Mk 3 arming wire to aft suspension Insert arming wire through MAU-166 swivel Orient wings as follows: a. Position GBU-12 and GBU-16 wings in X configuration with the wing release latch mechanism at 9 o’clock, with the bomb lugs at 12 o’clock when viewed from the rear. b. Position GBU-10 wings so that latch mechanism is at 12 o’clock in line with the bomb lugs. NOTE: Mk 3 arming wire installation for the GBU-12 and GBU-16 is the same as for GP bombs, discussed earlier in this chapter. For the GBU-10, install arming wire through hole at the 3 o’clock position of wing and route through pull-out pin/gagrod and pass wire out through hole at 9 o’clock position of wing assembly. 6. Remove safety cotter pin from pull-out pin/gagrod. 7. Keep arming wire taut while pressing the wing against the bomb body. Hand tighten setscrews. 8. Torque setscrews to the required torque. 13-17