MIL-DTL-1394G(AR)
6.6 Test validity. If for any reason the test activity considers that the test conditions have
detrimentally affected the test results, the test activity may request the Government to declare the test
invalid and authorize a new test.
6.7 Intermediate point inspection. The classification of defects identifies the defect
characteristics for acceptance inspection. It may be necessary to modify the sequence of inspection
stations to best suit the manufacturing process. Inspection for defect characteristics which will be hidden
or altered by subsequent processing operations (including unrelated operations), should be scheduled to
prevent premature acceptance which could be detrimental to the attainment of optimum product quality of
the end item.
6.8 Standard Deviation. Standard deviation (σ) should be calculated from the following formula
or other approved formula:
∑ (X
)
2
-X
σ=
i
n -1
Xi
= Each individual value
where:
X
= Sample arithmetic mean
= Sample size
n
6.9 Malfunction or casualty not covered by this specification. If a lot is suspended due to a
malfunction or casualty not covered by this specification, the lot should be referred to the contracting
officer.
6.10 Changes from previous issues. Asterisks and marginal notes are not used in this revision to
identify changes with respect to the previous issue due to the extensiveness of the changes.
6.11 Critical defects.
6.11.1 Hangfire. A hangfire occurs when action time of a round is sufficiently long that the bolt
unlocks before the projectile leaves the muzzle of the barrel. This results in unrestrained combustion and
possible firing of the projectile out of battery. This could cause massive damage to the weapon system
and weapon stoppage (see 6.11.2). In addition, in an aircraft application, due to the weapon's proximity
to the user a hangfire will also present a safety hazard due to fragmentation and shrapnel from the weapon
and the round.
6.11.2 Weapon stoppage. Due to the stand alone nature of the Land-based Phalanx Weapon
System, when an ammunition defect prevents the weapon from functioning, this is considered a Mission
Failure.
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