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).
