MIL-DTL-70526B (AR)
ignites the rocket motor. Static spin stand testing shall be
performed to determine suitability for ballistic testing and to
establish a baseline for delay assembly testing. During static
spin testing, the standard deviation shall not be greater than
0.62 seconds, and no long burn time outliers shall be present.
3.8.3 Delay assembly. Each production lot produced shall
have an acceptable static spin mean time per 4.4.8 and 4.4.9 or
an acceptable ballistic mean time of 15.25 + .75 seconds at 70
degrees F and proper function at -50 degrees F when tested
ballistically.
3.8.4 Ballistic safety. There shall be no in-bore function
(see 6.22 for definitions) of the delay or rocket motor.
3.9 Selector cap. After radiographic inspection of the
delay the selector cap shall be assembled hand tight.
3.10 Particle size.
3.10.1 Tungsten particle size. The tungsten shall meet all
requirements of MIL-T-48140 for TYPE I (Agglomerated) with a
bulk density ranging from 50-65 grams per cubic inch.
3.10.2 Potassium perchlorate particle size. In addition to
the requirements of MIL-P-217, the particle size at the 50%
level shall be 85 +/- 10 microns.
3.11 Workmanship.
The requirements of workmanship are as
follows:
a. Cleaning. If required the cleaning method shall not be
injurious to any of the parts nor shall the parts be
contaminated by the cleaning agent.
b. Delay assembly. Parts shall be free of burrs, chips,
dirt, grease, rust and other foreign matter.
3.11.1 Boron potassium nitrate. The boron potassium nitrate
pellets shall not have flashing or any other form of protrusion
attached thereto. The boron potassium nitrate charge shall be
free of dust, shards, and other types of particles at the time
of loading into the delay assembly.
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