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(BIT) designed to verify operational integrity. The spun up and tested, which takes approximately 30
missile is a point target weapon designed to destroy seconds a t nominal t e m p e r a t u r e s . At c o l d
armored or reinforced targets. It is comprised of one or temperatures, the test time may increase up to 47
two launchers containing up to two missiles each, and seconds. If the missiles pass BIT, then the inventory of
the necessary components, software, and switches to missiles installed is displayed in the position that the
operate the system. The HELLFIRE launchers can be missiles are located on the helicopter.
jettisoned using the JETTISON switches located on the
ACP. The weapon system except for the launcher is (3) If the missile fails BIT, the message BF is
electrically controlled and powered by the 28 Vdc displayed directly under that missile symbol. In the
essential bus. The HELLFIRE launcher uses one phase event of a BF indication, and if time allows, the missile
of the 115 Vac generator 3-phase essential bus. Circuit may be unseated and reseated on the launcher after
protection is provided by the HELLFIRE ARM, the system has been powered down. BIT can then be
HELLFIRE CONTR, HELLFIRE PWR, HELLFIRE AC, rerun.
and the ARMT CONTR circuit breakers located on the
aft centerpost circuit breaker panel. The HELLFIRE (4) Missile BIT status is displayed beneath each
launcher(s) are mounted on the ejector rack. They may missile symbol and is continuously monitored for
be installed on one or both sides. Symmetrical loading changes. The following additional FAIL messages may
is not required. be displayed during BIT:
NOTE
(a) MF  Displays if the RHE has detected the
In the event of an AC generator failure, the missile as failing after it was selected for spin up, the
HMS launcher loses AC power and no missile battery has failed, the missile failed to accept a
missiles can be launched. laser code, or if the missile failed to uncage.
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TM 1-1520-248-10
PULL
MAN
PULL
BKUP
BRT
C
ONT
300 330 N 030 060 E
W 00
000
90
0.7 NM
29T
HI
100
LO
25
16
W
HOT
90
HELLFIRE
ARMED
A, B
CONSTR
NORMAL
LAUNCH
NORM
DELVRY
HI
N 32° 58.07´
W 114° 16.11´ B A A B
RDY RDY RDY
8.3
2000
VID
TIS
Figure 4-62. HELLFIRE Missile System (HMS)
4-110
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
NOTE
(CDS4) Normal weapons VSD pages are no longer available for display.
1. MMS LOS Cue Shows MMS azimuth and elevation orientation.
2. DELVRY key Selects delivery modes for HELLFIRE missiles (rotary function).
LOBL  Missile acquires and locks on coded laser energy prior to launch.
LO  Missile trajectory low profile to clear terrain mask and locks on coded laser
energy as missile closes with target.
HI  Missile trajectory high profile clears terrain mask and locks on coded laser
energy as missile closes with target.
DIR  Missile trajectory direct when ceiling is too low for successful LOBL firing.
3. LAUNCH key Selects launch sequence for HELLFIRE missiles (rotary function).
STBY  System in standby.
MAN  Missile is manually selected for firing.
NORM  Missiles step in normal sequence when fired.
RIPL  Missiles are fired in rapid succession with alternating laser codes.
Figure 4-63. Normal HELLFIRE VSD (Sheet 1 of 2)
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(Cont)
CONTROL/INDICATOR FUNCTION
4. CONSTR key Selects HELLFIRE missile constraints (toggle function).
NORMAL  HELLFIRE launches when in constraint.
ORIDE  HELLFIRE may be launched when safety constraints are met.
5. WEAPONS STATUS Indicates OFF, SAF or ARM.
Figure 4-63. Normal HELLFIRE VSD (Sheet 2 of 2)
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CONTROL/INDICATOR FUNCTION
1. VID key Allows selection of video background source for the HELLFIRE sparse VSD.
Toggles between OFF, TV, and TIS.
2. HELLFIRE seeker cue Indicates HELLFIRE seeker position.
3. HELLFIRE constraints box Displays HELLFIRE constraints.
LOAL azimuth constraint drivers are prioritized as follows:
1. MMS LOS, with MMS mode select switch in PREPT.
2. Heading to DIR WPT, if in DIR WPT navigation mode.
LOAL range constraint drivers are prioritized as follows:
1. Current laser range (boxed).
2. Distance to PREPT waypoint with MMS mode select switch in PREPT and
MMS slaved to PREPT (Prepoint, Prepoint).
3. Distance to DIR WPT, when in DIR WPT navigation mode.
　
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