MIL-DTL-14852D (AR)
4.4.5 Magnetic particle inspection.
4.4.5.1 Projectile body. Heat treated or stress relieved
projectile bodies after final machining but prior to banding
shall be inspected by the magnetic particle inspection technique.
The procedures for performing this test shall be as specified in
ASTM E 1444 for wet fluorescent method with indirect
magnetization by continuous method or the residual method. The
entire body inside and outside shall be inspected after inducing
a circular field. The magnetic particle standard per Dwg. 9280423
shall be utilized to establish inspection sensitivity. Any body
which fails to comply with the requirements of 3.5 shall be
rejected. Projectile bodies which comply shall be stamped with
the letter "M" as specified on the applicable drawing.
4.4.5.2 Base plug. Base plug after final machining shall be
inspected by the magnetic particle technique. The procedures for
performing this test shall be as specified in ASTM E 1444 for wet
fluorescent method with indirect magnetization by continuous
method or the residual method. The magnetic particle standard per
Dwg. 9280424 shall be utilized to establish inspection
sensitivity. Any base plug which fails to comply with the
requirements of 3.5 shall be rejected. Base plugs which comply
shall be stamped with the letter "M" as specified on the
applicable drawing.
4.4.5.3 Suspension. The solid content of the suspension
shall be maintained at the level recommended by the suspensoid
manufacturer. The suspension shall be checked at the start of
each day's production and at intervals of not over 4 hours of
continuous operation, utilizing the procedures and equipment
prescribed by section 4 of ASTM E 1444. When performing this test
for solid content of the suspension, if it is determined that it
does not comply, all bodies that have been tested and accepted
since the last satisfactory test was performed shall be retested
after the suspension has been brought to the proper level (see
paragraph 6.6 and ASTM E 1444.)
4.4.6 Proving ground function tests.
4.4.6.1 Excess pressure. The metal parts assemblies inert
loaded and assembled in a complete round, shall be fired in a M20
series cannon, the tube of which will have a minimum of 25
percent life remaining based on current gun tube condemnation
criteria. A propellant charge adjusted to yield a mean pressure
of 42,500 psi with no maximum individual exceeding 44,400 psi
shall be used. Photographic equipment will be set up near the gun
muzzle to record the flight of the projectile to determine
compliance with 3.6. Recovery and examination of metal parts for
any abnormal condition shall be accomplished as necessary.
4.4.6.1.1 Production sampling. Normal sampling shall be
conducted until 3 consecutive lots have been accepted. Reduced
sampling will then be instituted. Any failure occurring while on
reduced sampling requires a return to normal sampling. Sample
quantities for normal and reduced sampling on a per lot basis
shall be as follows.
28
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business