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Flashcards in 2.75" Rockets Deck (37):
1

M274

Smoke Signature (Training)
Fuze: M423

2

M151

HE "10-Pounder"
Burst 10M, Lethal 50M+
Fuze: M423, M433

3

M229

HE "17-Pounder"
Burst 14M+, lethal 75M
Fuze: M423, M433
WARNING: Due to the possibility of premature
warhead detonation damaging the
aircraft when firing rockets with the
M229 warhead and MK66 rocket motor, a
clear and obstruction free line-of-sight to
the target shall exist. Minimum
engagement distance is limited to 984 ft
(300m) at forward velocities less than 60
KIAS, and 1480 ft (450m) at forward
velocities in excess of 60 KIAS.

4

M156

White Phosphorus
Target marking/incendiary
Fuze: M423

5

M267

Multipurpose Submunition
3 M75 Practice submunitions
6 Inert submunitions
WARNING:  Due to possible premature expulsion
of submunitions from the M261 or M267
warhead, the following restrictions
apply: Firing of 2.75-inch rockets with
M261/M267 warheads is limited to
ranges greater than 1000 meters, and
with forward airspeeds of less than 90
KIAS. If the aircraft fires while moving
faster than 90 knots and the warhead
prematurely functions, the aircraft can
fly into/under the submunitions. A climb
or a turn after firing the rocket during
running/diving fire is recommended.
Avoid following the rocket.
• Motor blows and premature expulsion
of submunitions from the M261 or M267
warhead can cause catastrophic hazard
if fired over friendly troops and
equipment. Firing over the heads of
friendly troops and equipment is
prohibited.

6

M261

Multipurpose Submunition
9 M73 Submunitions
Fuze: M439
Can penetrate 4 inches of armor
WARNING:  Due to possible premature expulsion
of submunitions from the M261 or M267
warhead, the following restrictions
apply: Firing of 2.75-inch rockets with
M261/M267 warheads is limited to
ranges greater than 1000 meters, and
with forward airspeeds of less than 90
KIAS. If the aircraft fires while moving
faster than 90 knots and the warhead
prematurely functions, the aircraft can
fly into/under the submunitions. A climb
or a turn after firing the rocket during
running/diving fire is recommended.
Avoid following the rocket.
• Motor blows and premature expulsion
of submunitions from the M261 or M267
warhead can cause catastrophic hazard
if fired over friendly troops and
equipment. Firing over the heads of
friendly troopsand equipment is
prohibited.

7

M255A1

Flechette
1,179 60 grain flechettes
35m wide cylinder of flechettes flying at mach2 fired in pairs
Fuze: M439

8

M259/M264

Smoke Screen
White/Red Phosphorus
72 phosphorus wedges ignite at ejection
WARNING:Premature expulsion of pellets from
the M264 warhead can cause burning red
phosphorous to fall on unprotected
friendly troops and flammable
equipment, causing burns and fire. firing
over the heads of unprotected friendly
troops and flammable equipment is
prohibited.
• When firing the M264 at ranges less
than 5 km, reduce helicopter velocity to
90 knots or less prior to firing. This will
preclude the inadvertent ingestion of red
phosphorous pellets into the engine
intake if a premature function/expulsion
of the warhead occurs during launch.

9

M278

IR Illumination
250 Watts near IR
1000 candle power of visible light
burns 180 sec.
4200m standoff range with M442 fuze

10

M257

Illumination
1 million candle power for 100 sec.or more.
3500m stand off range with integral M442 fuze.
Illuminates 1 square km at optimum height

11

M423

Mechanical Point Detonating Fuze
Arms at 52-110 meters
Used with M151, M156, M229, M274

12

M433

Resistance-capacitance multi-option time delay
Super quick (open terrain)
Bunker penetration (10ft)
Forest Penetration (10m-45m)
Used with M151, M156

13

M439

Resistance-Capacitance
Base mounted
set to expel 500m-7200m
(stores for 10 days)
Arming distance - 96-126m
Used with M255A1, M257, M259, M261, M264, M267, M278

14

M442

Mechanical time delay
Base mounted
Set to arm at rocket motor burn-out
Pyrotechnic delay 9.0 sec.
Used with: M257, M278
Illumination warheads

15

M446

Mechanical Time Delay
Base mounted
Set to arm at rocket motor burn-out
Phyrotechnic delay 4.5 sec
Used with the M255, M269, and M264

16

WARNING

To minimize the probability of
encountering engine surges, MK-66
rocket firing shall be limited to out-ofground-
effect conditions. A two second
interval shall be used for all rocket firing
below 40 KIAS. The normal rocket
system firing rate may be used for
airspeeds above 40 KIAS. Hover firing is
limited to a maximum crosswind and
tailwind of 20 Knots.

17

WARNING

Contact arm of launcher will provide
direct electrical path to motor ignition
circuit if power source is accidentally
applied to the contact arm when
launcher is loaded/unloaded. To prevent
inadvertent rocket firing, electrical tests
shall not be performed with rockets in
launcher, and all other possible sources
of inadvertent electrical power shall be
kept away from the launcher. Ensure
electrical power equipment, even if
turned off and unplugged, is not in the
vicinity of a loaded launcher.

18

R IMCPU Failure default Conditions

1. Fuzing will be AIRBURST 2250 meters
2. Zone will be ALL.
3. One firing impulse per press of the WPN-FIRE switch

19

R IMCPU Failure- Back up mode operation

1. MASTER switch- Armed
2. WEAPON SEL switch- Select rockets
3. WPN-FIRE siwtch- Press to second detent.

20

Misfire-2.75" rocket

WARNING: Due to lack of data, structural and aerodynamic effects on the aircraft in the event of a missile/rocket hangfire are unknown.
Indication: A misfire is a rocket that has been fired but the launch motor does not ignite.
Proceed as follows:
1. Position the aircraft so that rocket is orient downrange for a period of 10 minutes.
2. Upon landing the aircraft- Notify explosive ordnance disposal.

21

ROCKET/MISSILE- HANGFIRE

A hangfire is an event when a rocket or missile motor
ignites and produces thrust but hangs up on/in the
launcher and does not separate from the helicopter.
The resulting missile thrust is transferred to the
helicopter and may cause control difficulty and potential
structural damage. HELLFIRE missile thrust lasts for
approximately 2.5 seconds. Control of the aircraft is
crucial during this period and recovery is dependent
upon altitude and obstacles. Failure to immediately
counter missile thrust with control inputs may cause
loss of aircraft control.
WARNING: Activation of Jettison switch during missile hangfire may cause missile launcher package to veer off course, possibly, into the aircraft or rotor disk.CAUTION: If a HELLFIRE launcher is jettisoned with a single missile on the inobard launcher rail, the launcher may contact the landing gear skid tube.
In the event of missile hangfire proceed as follows:
1. Jettison switch(es)- Activate (only in event of residual fire.)
2. LAND AS SOON AS POSSIBLE

22

Mod 1

Mod 1 can be inadvertently ignited by electromagnetic radiation.

23

Hazards of Electromagnetic Radiation to Ordnance Filters

Mod 2 & 3 have HERO

24

MOD 2

Is prohibited due to the possibility of ejecting the stabilizing rod

25

MK 66 WARNINGs

OGE conditions
2 second interval below 50 KIAS; Normal system firing rate above 40 KIAS
Maimum crosswind/tailwind of 20 knots
Do not use an MK-66 that was stored above 140'F for more than 24 hours
Discard any rocket that is dropped
Electrical tests shall not be performed with rockets in launcher, and all other possible sources of inadvertent electrical power shall be kept away from the launcher. ensure electrical power equipment is not in the vic of loaded launcher

26

M229 warhead w/MK66 rocket motor -10 WARNINGS

Clear and obstruction free LOS to target shall exist
Minimum engagement distance is 984 ft (450m) greater than 60 KIAS
Minimum engagement distance is 1480 ft (450m) greater than 60 KIAS

27

M264 warhead -10 WARNINGs

Firing over the heads of unprotected friendly troops and flammable equipment is prohibited
At ranges less than 5 km, slow to 90 knots or less prior to firing

28

M261/M267 warheads -10 WARNINGs

Lmiited ot ranges greater than 1000 meters
Forward airspeeds less than 90 KIAS
A climb or turn is recommended during running/diving fire (avoid following rocket)
Firing over the heads of friendly troops and equipment is prohibited

29

Rocket Firing Mode Selections- Two Launchers Installed

Ripple singles
Ripple pairs
Singles singles
Single Pairs

30

Rocket Firing Mode Selections- One Launcher installed

Ripple Singles
Single Singles

31

-10 CAUTION

Each launcher tube is energized sequentially regardless of load status. Placing the MASTER switch in the OFF position and returning to the ARMED position resets the rocket weapon system, and will require pressing the WPN FIRE switch for each previously fired/empty launcher tube.

32

-10 Note

The firing of advance precision kill weapon system (APKWS) rocket is prohibited.
A visual inspection shall be made at the conclusion of a rocket firing operation to determine the status of the remaining load.

33

Firing Sequence

46, 213, 75

34

Range to Target

Range is boxed if current laser range is being displayed. Range not boxed is last valid laser range used. Display is boxed while laser is firing and for 5 seconds after laser firing is stopped.
"L" is laser range
"P" is prepoint range
"N" is direct-to waypoint range

35

Rocket Status

OFF, SAFED, or ARMED

36

CONTACT FUZE/CUE DISTANCE key

Fuze: S, B, 10-45
CONTACT: L, N, 500-8000m
Rounded down to 250m less than 3000m
Rounded down to 500m greater than 3000m

37

AIRBURST FUZE/CUE DISTANCE key

L, N, 500-6000m
Rounded down to 250 m less than 3000m
Rounded down to 500m greater than 3000m