MIL-DTL-398D
Lift the weight and raise the safety shield and allow the weight
to rest on the safety shield. Examine the percussion cap to
determine if an explosion has occurred. If an explosion has
occurred, the percussion cap is usually disintegrated. A partial
explosion may be recognized by inspection of the cap for parts of
the rim having been blown away. An explosion may also be
recognized by a sharp report or smoke in the area of the plunger,
Clean away all of the unexploded material and percussion cap
parts from the anvil, plunger and base plate with a brush or
cloth prior to placing the next test sample in place.
a. If the above test is a non-explosion, place a minus sign
on line zero (0) above Test No. 1 on the short impact method test
card. (See below for a sample test card.) Repeat the procedure
with one of the loaded percussion caps, and continue testing on
line zero until an explosion occurs or the acceptance (A) zone
has been reached. If an explosion occurs, move up to the next
line on the card and continue testing until an acceptance or
rejection is determined.
b. If the above test was an explosion, place a plus sign on
Line 1 above Test No. 1. Should a second explosion occur, record
the plus sign on Line 2 above Test No. 2. The sample would be
rejected and a long impact must be performed. If the second
sample is not an explosion, continue testing and record
explosions or non-explosions on their appropriate line until
acceptance or rejection is determined.
c. If the sample being tested is rejected, a long impact
value must be determined in accordance with 4.7.8.4.2. Otherwise
(if the sample passes the short impact test) report sample as
accepted on impact.
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