SB 742-1
ROCKET, 2.75 INCH
a. Test rockets IAW table U-1.
a. FSC: 1340.
MODEL
IRI
RI
PI
BLI
b. Ammunition Type: Rocket, 2.75 Inch
MK 40 Rocket Motor
A, B
B
N/A
N/A
c. Referred to as Hydra 70 Rocket, 2.75 Inch Rocket
system consists of a variety of warheads and fuzes and uses
A. Continuity Test: Test is not required for 2.75 inch
the MK 40 or MK 66 series rocket motor. Complete description
Hydra Rocket with MK 66 Rocket Motor.
of rockets/components can be found in TM 43-0001-30.
B. Torque test.
d. 2.75 Inch Rockets are air to ground rockets designed
for deployment from rotary and fixed wing aircraft.
b. Table U-2 identifies test and measurement equipment.
e. Rockets with MK 40 motor are low spin, folding fin air-
craft rockets (LSFFAR). Rockets with MK 66 motor are spin
stabilized, wrap around fin air- craft rockets (SSWAFAR).
Description
NSN
Application
APE 1189
4925AA11890000
Rocket Motor/
Complete Round
a. Palletized (boxed and fastpack container) rockets, or
APE 1189 Kits
Various
Rocket Motor/
rocket motors dropped five feet or more will be placed in CC-H
Complete Round
and reported IAW DA PAM 738-750.
Torque Fixture 4925-00-781-651
Fuze/Warhead
b. Unpalletized/unboxed/unpackaged rockets or rocket
1
Interface
motors dropped any distance will be placed in CC-H and
Warhead/Motor
reported IAW DA PAM 738-750.
Interface
c. Rocket motors are electrically initiated items and should U-4. Inspection category and sampling plan.
be protected from sources of electromagnetic radiation and
a. Inspection category.
stray currents. Personnel will wear conductive safety shoes
and will stand on conductive flooring or conductive mats when
(1) Category X: 4 years (includes Flechette, MPSM,
handling rocket motor. Inspection tables and test equipment
HE, WP, RP, Practice warheads/rockets; MK 40 and MK 66
will be properly grounded IAW DA PAM 385-64.
rocket motors)
d. Mk 40 Mod 1 and subsequent mods and Mk 66 all
(2) Category Y: 3 years (includes Flare and
mods are considered propulsive at all times.
Illuminating warheads/rockets)
e. Fuze,
Remote
Settable,
M439
has
a
b. Sampling plan for inspection is IAW chapter 2.
resistance-capacitance element, which is charged when
attempting to fire the rocket. If fuze is set (charged) and motor U-5. Specific Inspection Points.
fails to ignite, it may be loaded into another tube and fired.
This second attempt to fire, however, will not be accurate. Items will be inspected and classified according to chapter 2
Though fuze remains safe, once set, fuze requires ten days to and tables U-3 through U-6..
bleed charge to restore accuracy, and 45 days to completely
discharge.
TABLE U-3. Complete Round
Classification
Application
Inspection
Inspection
Method
Description
1. Critical: None defined
2. Major:
a. Loosely assembled components (i.e., fuze to warhead or
Visual/Torque Test
warhead to motor)
b. Gap between fuze and warhead or warhead and motor
Visual
c. Incorrect orientation in outer pack (i.e., nose end of rocket
Visual
not pointing in direction of nose end marking on outer pack)
3. Minor: None defined
Note: See tables U-4 through U-6 for defect criteria on individual components of complete round
TABLE U-4. Warhead
Classification
Application
Inspection
Inspection
Method
Description
1. Critical:
a. Filler exudation or leakage
Visual
b. Crack or dent in warhead
Visual
Previous Page
