12. Thread arming wire through two Fahnstock
clips and the bottom of the fin; vertically align
arming wire with arming wire slots located on
gag rod arming wire housing (FMU-139A/B)
Push arming wire into arming wire housing.
Remove safety pin from gag rod.
Assembly of BSU-86 and BSU-85 Fins to GP
Inspect the BSU-86 fin (fig. 13-8) as follows:
Inspect fin for damage and improperly in-
stalled or missing parts and corrosion.
Ensure that the restraining band is free of
corrosion. If damage is found or suspected,
complete steps 3 through 7; if no damage,
proceed to step 8.
Remove cotter pin from fin latch; ensure latch
NOTE: If fins extend automatically at least 1/2
inch when the cotter pin is removed, and can be
extended to contact the shock absorber by
hand, the fin is operative.
Check that link pins and link pin retainers are
present, not damaged, and properly positioned
in the drag links.
Close fins and clamp together with vise grip
Relatch the release band, and insert warning
Remove vise grip pliers.
Ensure band, retainer, and release assembly are
Ensure the lanyard swivel is installed on
Ensure the release lanyard and housing and the
safety clip are not damaged.
Ensure the slotted spring (roll pin) is installed
and is properly seated and not protruding from
Inspect the BSU-85/B fin (fig. 13-9) as follows:
Ensure safing pin assembly, safety latch pin,
and lanyard clip are properly installed.
Ensure all setscrews are installed and flush
with inside surface of the forward ring.
Figure 13-8.BSU-86 bomb fin.