MIL-DTL-44050B
outer metal frame. The frame shall be designed to capture the entire periphery of the test
panel to a depth of 1-1/2 inches to 2 inches. The frame shall also be designed to provide
a minimum available test area of 121 square inches. The mounting frame will be
clamped, at a minimum, in eight locations around its periphery, i.e. at each corner and at
the mid-point of each side. (NOTE: vise-grip type pliers or equal have been found to be
acceptable for clamping.) The test panel shall be mounted with the expressed intent of
providing for uniform tension throughout and to provide for a minimum of deflection at
projectile impact.
e. Measurement of yaw. Yaw shall be determined using the system specified in 4.5.6.
Yaw may be examined at any time deemed necessary. However, in any event, yaw shall
be measured at intervals no less than those indicated below. When the barrel is new, a
minimum of 25 shots shall be fired to "break-in" the barrel. Measurement of yaw shall
be five successive shots at each interval.
Measurement interval
1. After "break-in" period.
2. After 250 shots.
3. After 500 shots.
4. After 750 shots.
`
5. After 1000 shots.
In the event the shots fired indicate yaw, the barrel shall be rechecked for affect on
yaw as follows: Fire five shots, if three or more shots exhibit yaw, discard the
barrel. If one or two shots exhibit yaw, investigate cause and correct. If no yaw is
indicated at the 1,000 - shot interval, measurement for yaw shall be made at 100 shot
intervals thereafter until such time as yaw is indicated. In the case of a dispute
concerning a particular barrel, yaw shall be measured by a photographic measurement
system using a multi-flash light source to determine projectile velocity and yaw. Yaw
shall be measured by the system to an accuracy of 0.5 degree.
f. Fair Impact. The impact shall be considered fair when an unyawed test projectile
strikes an unsupported area of the test panel at least 2 inches from a supported area of the
test panel and at least 2 inches from any previous impact, and shall not involve the same
warp or filling yarns of any previous impact.
4.5.7 Toxicity test. When specified in the contract or purchase order (see 6.2), an acute dermal
irritation study and a skin sensitization study shall be conducted on laboratory animals. When
the results of these studies indicate the (item) is not a sensitizer of irritant, a Repeat Insult Patch
Test shall be performed in accordance with the Modified Draize Procedure (See 2.3). If the
toxicity requirement (see 3.14) can be demonstrated with historical use data, toxicity testing may
not be required and shall be specified in the contract or purchase order (see 6.2).
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