Strana 13
Operation:
Once the arming vane (1) of the safety mechanism spins off due to air flow pressures following release of the bomb, two locking balls (5), which
previously prevented the movement of the firing pin (6) and its housing (2), are released. Upon impact with the target in nose-action mode, the firing
pin housing containing the primer (3) moves against the firing pin needle. In tail-action mode, the firing pin and needle move against the primer.
In the event of a side impact, the firing pin and its housing slide along conical surfaces, causing the primer to be struck. The flame generated by the
primer (with the adjustment screw in position) ignites the delay mechanism (4). After burning through both grooves (taking 22.5 to 31.5 seconds), this
ignites the booster explosive (10), which transfers the reaction to the detonator (7) and subsequently to the initiating charge (8). If the adjustment
screw (9) is unscrewed to be flush with the fuse body, the flame from the primer propagates through the booster pellet and the connecting delay
mechanism (4) to the lower section of the delay element. After 11 to 13 seconds, it then ignites the detonator‘s booster chaarge (10). If the fuse is to
be used for bottom-action detonation, the vanes of the arming propeller must be manually rotated to the opposite position (to ensure safe separation
and thus arming of the fuse, an effect of airflow after bomb release).
Fig.13 Cross section of the
AV-1D/U fuse with main
components.
Fig.14 Detail of the AV-1D/U fuse delay mechanism
set for a 22 second delay (screw fully screwed in)
following bomb impact, showing the flame path
from the detonator.
Fig.15 Detail of the AV-1D/U fuse delay mechanism
when setting detonation delay to 11 seconds
(screw removed) after bomb impact with the
flame path from the fuse marked.
Fig.16 Delay mechanism of the
AV-1D/U detonator. Arrows
indicate the flame path.
1 5 6 2 3 9 11 4 7 810
TECHNICS / EQUIPMENT
INFO Eduard
13
October 2026