Disassembly
of the bomb and detachment of the stabilising parachute unit must proceed
simultaneously.
1.Screw
in the safety plug and remove the bomb from the flying wire assembly.
2.Unscrew
the arming pin from the arming pin extension. Lift up the arming pin to
prevent rubbing off the shear wire.
3.While
the bomb is held in a vertical position with the firing pin ring uppermost,
unscrew the knurled ring and remove the percussion unit from the magazine. If
the bomb is loaded, remove The detonator.
4.Remove
the Sealing Washer and the Felt Washer from the magazine holder. Loosen the
Jubilee clip, and withdraw the bursting charge, if it is of the removable
type.
5.Slide
the Jubilee clip off the split skirt. and withdraw the magazine holder from
the stabilising parachute. The lid of the parachute container should be held
firmly to prevent it severing from the body at the weak point.
6.Detach
the magazine holder from the stabiliser strop by untying the larks head knot.
7.Unscrew
the firing pin housing and remove the firing pin and the firing pin spring
from the firing pin housing.
8.Remove
the swivel and firing pin ring by unscrewing the swivel housing from the
swivel housing cup. Remove the swivel housing cup from the firing pin housing.
9.Unscrew
and remove from the percussion unit the four screws which retain the time ring
assembly and remove the time ring assembly. The time ring assembly has no
function with the bombs used in the American barrage balloons .
10.Withdraw
the small anvil from its recess at the end of the shutter guide channel.
Prying the anvil base with a screwdriver if necessary. The anvil has a hole
through it to accommodate a primer. The primer has no function in the bombs
used in the American barrage balloons, but a dummy primer must be inserted to
position the shutter when the arming pin is withdrawn.
11.Remove
the shear wire from the arming pinhole. Slide the shear washer off the arming
pin. Withdraw the arming pin and the shear collar from the shutter spindle.
Remove the shutter spindle washer.
12.Unscrew
and remove the safety plug and washer. Invert the percussion unit and catch
the shutter and shutter spring as they fall out of the shutter guide channel.
Remove the shutter spring from the shutter spindle.
13.Remove
the safety pin from the percussion unit by inserting a small diameter rod into
the safety plughole and pushing the safety pin until it can be lifted out.
Remove the spring washer from the safety pin.
This
bomb is made with rolled joints and
cannot be
disassembled.
The
procedure for detaching the stabilising parachute from this bomb is the same
as that described in 5 and 6 above.
Notes
on Assembly of Bomb H.E., A.A.D., No.4 Mark IV
The
assembly of the bomb and the attachment of the stabilising parachute must
proceed simultaneously.
To
assemble the bomb and attach the stabilising parachute unit proceed as
follows:
1.Slide
the safety pin spring onto the safety pin and the safety pin washer onto the
shorter shank. Assemble the safety pin to the percussion unit so that the
longer shank engages in the slot in the shutter guide channel, the shorter
shank engages in the hole opposite the slot and the spring is compressed
between the shoulder of the safety pin and the shutter guide channel.
2.Slide
the shutter spring onto the shutter spindle and place the shutter in the guide
channel.
3.Screw
the safety plug washer Into the body until the plug engages with the safety
pin. Push the shutter along the guide channel so as to compress the spring.
When the hole in the wall of the shutter is opposite the slot in the shutter
guide channel, screw in the safety plug until the safety pin is fully engaged
with the shutter.
4.Slide
the shutter spindle washer and the shear collar onto the shutter spindle,
ensuring that the chamfered end of the shear collar bears against the washer.
Insert the arming pin so that its knurled end is towards the base of the bomb.
Assemble the shear washer and shear wire to the arming pin.
5.Insert
the swivel housing cup into the
firing pin housing and screw the swivel housing into the swivel housing cap
with a firing pin ring inserted between the two.
6.Insert
firing pin into the firing pin housing with the point exposed and slip the
firing pin spring onto the firing pin. Screw the firing pin housing onto the
percussion unit, ensuring that the firing pin sits over the collar provided
for it.
7.Insert
the anvil.
8.Insert
the time ring assembly into the percussion unit so the small stud on the cover
engages with the slot in the shutter guide channel. Be sure that the stud does
not engage the primer hole in the shutter. Secure the time ring assembly with
the four screws.
9.Slide
the Jubilee clip onto the magazine holder beyond the ridge. Attach the
stabiliser strop to the to the lug on the base of the magazine holder with a
lark’s head. The stabiliser strop must be handled carefully, since undue
tension on the strop may break the weak joint between the lid and the body of
the parachute container. Check to see that the rubber sorbo is in position at
the base of the spit skirt.
10.Coil
the stabiliser strop into the stabilising parachute container through the
central hole in the lid. Place the parachute container against a firm level
surface with the weak end up and push the magazine holder into the split skirt
so the ridge on the magazine holder registers in the groove with the split
skirt. While inserting the magazine holder ensure the stabiliser strop is not
trapped between the base of the magazine holder and the rubber sorbo ring of
the stabilising parachute container.
11.Slide
the Jubilee clip into position against the outer ridge on the
split skirt with the clip screw diametrically opposite the arming wire
hole. Tighten the clip until the magazine holder cannot be rotated by hand
inside the split skirt.
12.Insert
the bursting charge in the magazine holder ensuring that the detonator cavity
is exposed and place the felt washer on top of the charge.
13.Smear
Luting on the leather sealing washer, the magazine holder flange and the
knurled ring. Place the seating washer on the magazine holder flange and
secure the percussion unit to the magazine holder by screwing up the knurled
ring. Be sure that the arming pin is opposite the arming wire hole in the
parachute container.
14.Make
a loop in the arming wire and screw the arming pin into the arming pin
extension. The arming pin must be lifted slightly to prevent rubbing off the
shear wire.
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