MIL-P-50601A(MU)
4.5.1 Band tightness. -The method of test shall comply with all requirements
of the operating instructions for the band tightness tester (see Dwg. B7259545,
a detail-of LI 11731537). The inspection sample shall be cycled through the
tester to determine compliance with the rotating band tightness requirement.
The total measurement of radial void (band looseness), registered on the
tester indicator at final ram pressure, shall be divided by four (number of
indenters) to determine the average radial void.
4.5.2 Soundness.-The method of inspection shall comply with all requirements
of Operating Instructions, Eddy Current Flaw Detector, (see Dwg. D110752O3, a
detail of LI 11731537) for Detecting Metal Discontinuity in Projectile
Bodies for 20mm Ammunition, except for those inspection requirements which
are reserved for Government application, as specified herein.
4.5.3 Automatic eddy current inspection effectiveness. -Equipment checkout
shall be performed as stated in the Operating Instruction Manual at the
start of each shift and after any adjustment or shutdown. Upon completion
of checkout, cycle the PCS #1, front slot and rear slot standards through
the inspection system during automatic operation. All three standards must
be rejected to assure correct adjustment for reject level and scan limits.
During the remainder of shift the PCS #1 shall be cycled through the equipment
at intervals of 20 ± 5 minutes during automatic operation.
4.5.4 Equipment verification. -The Government inspector will maintain inde-
pendent of the contractor, a set of standards and may cycle these standards
through the equipment at any time. Failure of equipment to reject standards
will be evidence that the equipment is not properly adjusted and the contractor
will be so notified. (see 6.7)
4.5.5 Soundness verification. -After equipment checkout and verification as
specified in 4.5.3 and 4.5.4 the entire lot sample will be inspected with
the equipment operating automatically. Any rejected unit of the sample will
be automatically cycled through the equipment with the CAL. button pressed
(to lower the sensitivity one step below that used for production inspection).
Any unit which is rejected at the lower sensitivity shall be classed as
defective.
4.5.6 Projectile nose torque. -Equipment shall be as specified in LI
11731537. Each projectile nose of the test sample shall be marked with
a light scratch extending axially across the nose and projectile body.
Torque as specified in 3.7 shall be applied slowly to the nose. Movement
of the nose with respect to the projectile body, detectable by misalign-
ment in the scratch mark, shall be recorded.
4.5.7 Phosphate coating. -The method of test shall be as specified in
TT-C-490 for the type of coating used. The standard panels shall be proc-
essed , with the projectiles to be represented, at the start of daily produc-
tion and at four hour intervals, maximum, thereafter. Appearance and weight
of the coating shall be recorded.
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