SB 742-1
h.
Visual/Manual
Nozzle and Fin Assembly loose, cracked, dented, gouged
or distorted
i. Missing, cracked or damaged fin hinge pin
Visual
j. Missing or damaged fin(s)
Visual
k. Shielding and fin restraint band missing/damaged
MK66, MODS 1,2 and 4
Visual
l. Missing/damaged end shield
MK 66 Motor all Mods
Visual
Para U-6k and 7
2. Major:
a. Corrosion/rust on metal surfaces or threads extensive
Visual
enough to prevent assembly and/or affect metal integrity
b. Damaged threads that would prevent assembly
Visual
c. Blistering or peeling paint that would require complete
Visual
repainting
d. Marking illegible/obliterated to extent that item cannot be
Visual
positively identified
e. Lock wire distorted or improperly assembled protrudes
Visual
above surface of rocket motor tube
f. Missing contact disc or fin retainer
MK 40 motor
Visual
g. Dent or bulge in EMR shield
MK 66 Mod 3
Visual
h. Igniter circuit resistance not within prescribed limits
Test
i. Missing, damaged or loose nozzle seal/blow out seal
MK 40 motor
Visual
j. Missing or damaged weather seal
MK 66 motor
Visual
3. Minor:
a. Light corrosion/rust that does not affect assembly or metal
Visual
integrity
b. Markings faded, dim and/or partially illegible, but item
Visual
can be identified
c. Paint blistering or peeling in spots
Visual
d. Scratches through entire protective coating
Visual
e. Shielding/fin restraint band improperly positioned or tape
Visual
holding band to nozzle missing
e. For MK 66 motors, check to see if the end shield is
damaged and requires replacement.
a. In pre-1970 designs, a loose ogive (with rotation but
without longitudinal looseness) does not represent a
f. Gap is considered to exist if component is not seated for
performance, safety or storability problem. For post-1970 a full 360 degrees.
designs, a loose ogive could represent a storability problem
g. Criteria for gouge in warhead:
(seal broken) and is considered a major defect. The following
defines P/ns for the different fuze designs:
(1) M156, M257, M259, M264, M78: a gouge with
visible depth will be considered a critical defect.
Fuze
Pre-1970 P/N
Post-1970 P/N
(2) XM255E1, M261, M267, WDU-4A/A: a gouge with
M423
8883683
9254708-1
visible depth will be considered a major defect.
M427
8883745
9254708-2
h. M151, M229, M230, M247, M274, WTU-1/B: a gouge
b. Torque test
having a depth of 1/16" or more and length of " or more will
(1) Torque fixture listed in table U-2 (formerly APE be considered a critical defect; other gouges will be considered
2075M1) will be used. Warheads without fuze wrench slots a major defect.
may be tested using a torque wrench adapter that must be
i. Criteria for gouge in fuze body: a gouge having a depth
locally fabricated using drawing AXMRR-7507A. This drawing
of 1/16" or more and length of " or more will be considered a
may be obtained from DAC, McAlester, OK .
critical defect; other gouges will be considered a major defect.
(2) A line will be scribed or drawn across the
j. Shielding/fin restraint band is considered damaged if it
junctions (fuze to warhead and warhead to motor) to provide a
contains a hole or cut through entire thickness within one inch
means of detecting movement between components.
55
of its aft edge. EMR shield is considered damaged if it contains
foot-lbs torque will be applied in a tightening direction. Any
a hole or crack within one inch of the aft edge of the EMR
movement at less than 55 foot-lbs is a test failure.
shield.
c. Do not attempt to twist nozzle assembly. Should the
k. End shield is considered damaged if it contains a hole
nozzle assembly wobble or move lengthwise, it is defective.
(other that fin pin holes) or cut through entire end shield. The
d. Perform igniter circuit resistance test IAW Ammunition end shield is bonded to the aft face of the nozzle.
Peculiar Equipment Operational Manual and Parts List For
APE 1189 Rocket Motor Continuity Tester. Igniter circuit
resistance limit is MK 40 series Motor: .63 to 4.0 ohms
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