ADAPTER BOOSTERS

described in the preceding paragraph except that an option wire is installed. If the pilot selects the primary mode of delivery when the weapon is released from the aircraft, only the arming wire is pulled out and the primary mode of the fuze is initiated. If the pilot selects the option mode of delivery, both the arming wire and the option wire are pulled out, initiating the option time mode of the fuze. If only the option time wire is pulled out on airborne release, the fuze will dud. Both the fuze arming wire and option wire must be pulled out for the fuze to function in the option mode. REVIEW NUMBER 3 Q1. What bomb is used with the Mk 339 mechanical time fuze? Q2. The primary and option delay of the Mk 339 fuze is set at the factory. What means can be used to change the settings for tactical requirements? Q3. How can you tell if the Mk 339 fuze has shifted from the primary to the option delay? Q4. Describe what you will see in the observation window of a Mk 339 fuze for the conditions listed below: Safe Armed ADAPTER BOOSTERS An adapter booster is needed to install mechanical fuzes in the Mk 80 (series) general-purpose bombs. The adapter boosters currently in use are the M148/T45E, M148E1 (nose), and the M150/T46 (tail). M148/M148E1/T45 (Series) Adapter Booster The M148/M148E1/T45 (series) adapter booster (fig. 1-4) permits the use of mechanical nose fuzes in 1-8 Figure 1-4.—Adapter-booster M148/E1 (series).