MIL-DTL-46540C(AR)
and the case to provide adhesion. The litmus paper will be handled with forceps to prevent contamination
from fingers. Smoking should not be permitted in the vicinity of test since tobacco smoke will turn red
litmus blue. Pieces of red and blue sensitive litmus paper will be placed in several locations both on the
interior and exterior of the case. A definite color change is defined as the color produced when blue
litmus is immersed for thirty seconds in one thousandth normal (.001N) hydrochloric or sulfuric acid, or
when red litmus is immersed for thirty seconds in one thousandth normal (.001N) sodium hydroxide.
Litmus paper is considered of sufficient sensitivity if it shows change in color when immersed for 45
seconds, with stirring, in five ten thousandths normal (0.0005N) solutions of the corresponding acid or
alkali mentioned.
4.4.5 Function and casualty. The method of test shall be as specified in SCATP-20. The test
sample cases shall be assembled as Cartridge, 20MM, Target Practice, M55A2, conforming to drawing
D7258817; or Target Practice, PGU-27, conforming to drawing 1575AS300. The sample test cartridges
shall be fired, at ambient temperature, in bursts of 50 rounds in the quantities and weapons as specified in
the table below. The gun barrels shall be at ambient temperature at the beginning of the test and shall be
cooled to ambient temperature after each 100 rounds.
TABLE IV. Function and casualty testing
M61 Weapon
M39 Weapon
Accepted cases will be used in
20mm PGU Ammunition:
400
All other 20mm Ammunition:
200
200 1/
Case First Article Test:
2000
2000 2/
Notes:
1/ Customers, through the procuring activity, may modify this requirement and base acceptance of
cartridge cases that will be used to fulfill their orders on the firing of 400 rounds in the M61 Gun.
2/ Customers, through the procuring activity, may modify the first article test and base acceptance on the
firing of 4000 rounds in the M61 Gun.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military service's system
commands. Packaging data retrieval is available from the managing Military Department's or Defense
Agency's automated packaging files, CD-ROM products, or by contacting the responsible packaging
activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory.)
6.1 Intended use. This item is military unique, and these cartridge cases are intended for
ammunition to be used in U.S Army, Navy, Marines and Air Force 20mm automatic gun systems that
have been designed for firing cartridges having the M103 type case configuration.
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