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|  MIL-C-45525B(WC)
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3. REQUIREMENTS
3.1 First article. When specified in the contract, the contractor shall
submit a first article sample. The definition and inspection of the first
article sample shall be as specified in 4.4. Unless otherwise specified
(see 6.1.1), the first article shall be included in the pilot pack (see 5.1).
3.2 General requirements. Cannons and parts therof shall conform to the
drawings listed in Engineering Parts List 11577214, and the requirements of
this specification and MIL-C-13931.
3.3 Functioning. All parts shall function smoothly without interference,
erratic movement or malfunction.
3.3.1 Breech mechanism. Camming of the operating crank during counter-
recoil or rotating the operating handle rearward and to the right shall
force the breechblock operating rack downward and to the right. This
action shall. cause the breechblock to rotate counterclockwise to disengage
the sectored threads. At this the sufficient force shall be exerted, through
action of the operating crank, to overcome the carrier-latching plungers
thereby releasing the plungers from the catches attached to the breech ring
and in turn allowing the carrier and breechblock assembly to swing to the
open position. The breech mechanism shall be retained in the open position
by means external to the cannon, i.e., engagement of the operating crank
roller in the operating cam of the mount.
3.3.2 Breech closing. Closing of the breech shall be accomplished by lifting
the operating-cam of the mount clear of the operating crank roller. Release
of the crank shall allow the torsion springs to drive the crank clockwise
and forcibly return the breechblock and carrier to the closed position.
Action of the rack spings against the breechblock operating rack shall rotate
the breechblock clockwise to engage the sectored threads. If the breech
fails to close fully, manual closing shall be accomplished by engaging the
clutch in the notch of the operating crank assembly and rotating the operating
handle to the left and forward. The operating handle shall latch in the
closed position. Counterclockwise rotation of the adjustor shall increase
the pre-load on the torsion springs.
3.303 obturator surface. The obturator surfaces shall conform to the
requirements prescribed in MIL-C-13931.
3.3.4 Block assembly. The block assembly, with a percussion-type firing
mechanism mounted in position, shall. slide in the slot in the housing
assembly into the extract position when the breechblock is moved to the
open position. As the extract position is reached, the extractor shall
forcibly eject the primer out of the spindle chamber. When the breech-
block is moved to close the breech, the block assembly shall be automatically
caromed from the extract to the load position while the extractor is caromed
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