MIL-DTL-46992E (OS)
3.8 Airtightness. All knife delay assemblies shall be leak tested and shall not exhibit a leakage rate in
excess of 1 x 10-4 cc of helium per second at a pressure differential of one atmosphere (see 4.4.9).
3.9 Lanyard assembly. The lanyard assembly shall withstand a tensile load of 200 pounds minimum
without separation of parts (see 4.4.10).
3.10 Radiographic examination. After completion of assembly, all cutters shall be radiographically
examined for proper assembly and presence of components. Any evidence of misassembly or missing
parts shall be cause for rejection of that assembly (see 4.4.11).
3.11 Staking. The staking between the firing pin assembly and case shall withstand a breakaway torque
of 25 inch-pounds without turning or loosening of the components (see 4.4.12).
3.12 Vibration. The cutter shall withstand the vibration test without evidence of any disintegration of
the primer, delay column, propellant, or damage of any component (see 4.4.13).
3.13 Non-withdrawal and withdrawal of cotter pin. The safety cotter pin shall not withdraw from the
cutter when a pull force of 10 pounds minimum is applied to the pin. The pin shall be withdrawn when a
pull force of up to 30 pounds maximum is applied to the pin (see 4.4.14).
3.14 Functional.
3.14.1 Initiation. The firing pin shall not be released when a force of 10 pounds is gradually applied to
the lanyard assembly. The cutter shall function when the firing pin is released. The firing pin shall
release when a force equivalent to dropping a 20-pound weight from a height of 3 ± 1/3 inches is applied
to the lanyard assembly (see 4.4.16).
3.14.2 Cutting. The cutter shall completely sever two reefing lines when functioned (see 4.4.16).
3.14.3 Delay time. The delay time shall be as indicated in Table I when tested in accordance with 4.4.16
(see 6.6.2).
3.14.4 Functioning over temperature range. The cutter shall function satisfactorily without failure
(see 6.6.1) throughout the temperature range of -65 to 165 °F when tested in accordance with 4.4.16.
TABLE I. Delay time.
Delay time (seconds)
Temperature (°F)
M21
M22
2.3 ± 0.7
11.0 ± 2.0
-65
2.0 ± 0.4
10.0 ± 1.0
70
1.8 ± 0.6
9.5 ± 1.5
165
3.14.5 Functioning at high setback. The cutter shall function satisfactorily, as evidenced by complete
severing of the reefing lines when a shock force of 700 g minimum is applied to the cutter (see 4.4.17).
3.14.6 Misfire. There shall be no misfires.
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