Hellfire II Romeo Directed Study

Question 1

Four Launch Modes:

Answer 1

LOBL
LOAL direct, low & high

Question 2

Answer 2

Question 3

Pneumatic Accumulator pressure

Answer 3

A spherical gas reservoir pressurized to 8800psi (607 bar) of nitrogen/helium

Question 4

What is this?

Answer 4

A dual-section, fused-salt lithium silicon iron disulfide battery that produces a single 28Vdc
output.
Activated by a dual-bridge Electro-Explosive Device (EED)
Following battery initiation, thermal activity within the battery will produce case temperatures up to 260°C.
The battery will generate and meet the 28Vdc requirements of the missile for a minimum of 55 seconds.
Battery output is terminated when the battery cools to a temperature of 204 °C, where solidification of the electrolyte takes place.

Question 5

LM-ESAF Arming Inputs

Answer 5

The primary inputs into the ESAF are;
a.Arming Power (28 VDC);
b.Logic Power (15 VDC);
c.Umbilical disconnect;
d.Firing delay message;
e.Longitudinal acceleration; and
f.Impact trigger.

Question 6

The sequence of events required for the arming sequence are as follows:

Answer 6

a.Power on;
b.LM-ESAF successfully passes BIT;
c.LM-ESAF (microcontroller) detects umbilical separation and arm power;
d.LM-ESAF (microcontroller) detects first motion;
e.LM-ESAF (microcontroller) verifies first motion (> 7g’s for > 6 m sec);
f.LM-ESAF (AGS circuit) verifies first motion (> 8g’s);
g.LM-ESAF (microcontroller) calculates safe separation distance of 400m within 3.2 seconds;
h.LM-ESAF (AGS circuit) times minimum safe separation Arm Delay Time of 1.8 seconds;
i.LM-ESAF (FPGA) counts down Arm Delay Time (1.9 sec. minimum); and
j.LM-ESAF receives “Arm” command from Controller and charges the FMs (i.e., arms).

Question 7

Rocket Motor burn out point (time)

Answer 7

Around 2.8 seconds - well after LM ESAF arming is completed

Question 8

The ESAF initiates the Low Voltage Hardened Temperature Delay Firing Modules within what timeframe?

Answer 8

The LM ESAF will then initiate the LVHTDFMs within 20 microseconds of detection of either of two signals. The first is the impact sensor (crush switch) in the nose of the missile shorting. The second is the AGS signal to the LM-ESAF.

Question 9

How is the Hellfire container moisture controlled?

Answer 9

The container provides a moisture-controlledenvironment by use of an internal humidity indicator and replaceable desiccant.

Question 10

Hellfire energetics propellant/Precursor/main warhead/booster

Answer 10

Main Charge. The main filling of the warhead consists of a 2.8kg PBXN-9 fill. The booster contains 315mg of PBXN-5.

Question 11

What are the four major sections of the AGM-114M-1 Hellfire II?

Answer 11

Guidance
Warhead
Propulsion
Control

Question 12

What is the Electronic Safe, Arm and Fire device (ESAF) arming sequence?

Answer 12

Power On

Built in Test (BIT) passed

Umbilical separation

Fuse data

Safety separation have been received in the proper sequence.

Question 13

Guidance Section consists of:

Answer 13

Sensor Group - gyro optics, dome assembly, potted coil assembly with impact switch, video amplifier circuit card assembly

Guidance Electronics Group - DMS collector assembly, DMS sample and hold, motherboard, power supply, spin torquer

Forward launch shoe, umbilical connector housing, inertial measurement unit, strakes, precursor warhead, dome assembly

Question 14

Propulsion Section consists of:

Answer 14

 Case/grain assembly
 Safe-arm-igniter and rod/grain assembly
 Phenolic stabilizer (spider) nozzle
 Wiring harness

Question 15

Hellfire Targets

Answer 15

Ship superstructures
Deck mounted weapon systems
Light armoured vehicles
Trucks
Light bunkers
Buildings

Question 16

Propellant

Answer 16

(9.3 kg) of GEU propellant - modified cross linked double base propellant of RDX/NC/NG in PolyglycolAdipate (PGA) / Butanetriol Trinitrate (BTTN) binder and the chemical stabilisers, N-methyl-paranitro-aniline (MNA) and 2-nitrodiphenylamine (2-NDPA).