DS 30mm/2.75in

Question 1

What does the abbreviation SAPHEI stand for ?

Cartridge 30mm OSPEI (SAPHEI) F7671

Answer 1

Semi Armour Piercing High Explosive Incendiary

Question 2

What is the Fuze fitted to the Round?

Cartridge 30mm OSPEI (SAPHEI) F7671

Answer 2

FZ BD MR3005

Question 3

Label the FZ BD MR3005

Cartridge 30mm OSPEI (SAPHEI) F7671

Answer 3

diagram…

Question 4

What is the explosive fill contained within the
Cart 30mm OSPEI F7671 (SAPHEI)1A/1W

What is the quantity

Answer 4

HEXAL (RDX, Aluminium and wax)

16 grams

Question 5

The Cart 30mm OXAS F2271 (TP) is ballistically matched to the operational round. True/False?

Answer 5

True

Question 6

What are the major component GROUPS of the
FZ BD MR3005?

Cartridge 30mm OSPEI (SAPHEI) F7671

Answer 6

FZ Base
FZ Body
Rotor Assembly
Firing Pin Assembly
Priming Relay

Question 7

At assembly the detonator is loaded to the rotor, which is fitted in WHAT location, and WHAT degree out of alignment?

FZ BD MR3005 for the SAPHEI

Answer 7

At assembly the detonator is loaded to the rotor, which is then fitted in between the two half casings 70 degrees out of alignment to the firing pin channel.

Question 8

At what distance is the “muzzle safe distance”?

What is the time for Self Destruct to initiate and what force is occuring?

Answer 8

15 metres

6 - 16 Sec time of flight
spin decay

Question 9

Ejection Velocity xx
Duration of burn xx
Pulse Duration
FLARE COUNTERMEASURE INFRA-RED DSTL 22

Answer 9

• 35 to 55 millisec
• 5.0 sec max
• 10 millisec

Question 10

Why do they have weighted noses in the DSTL 22 and other flares? x x

FLARE COUNTERMEASURE INFRA-RED DSTL 22

Answer 10

• To increase inertia and thus reduce the deceleration of the payload.

Question 11

What are the purposes of the alloy wrap on IR pellets? (3) xx

FLARE COUNTERMEASURE INFRA-RED DSTL 22

Answer 11

• Environmental seal for it pellets
• Promotes primer propagation by acting as a momentary gas seal
• Safety function to prevent inadvertent ignition

Question 12

How and what does a sequencer do?
xx

FLARE COUNTERMEASURE INFRA-RED DSTL 22

Answer 12

• Is to ignite IR Pellets only after they have cleared the dispenser.
• Ignition is positively prevented whilst the payload is being ejected.

Question 13

Duration of installation? (Time of life)

FLARE COUNTERMEASURE INFRA-RED DSTL 73

Answer 13

90 days or 100 airframe hours

Topic 24

Question 14

How would the 118 Mk 3 be rendered safe during normal manual handling operations?

FLARE COUNTERMEASURE INFRA-RED 118 MK3

Answer 14

By the inclusion of the sequencer

In order for the flare pellet to be ignited, the take-over cup composition must be initiated followed by movement of the slider to open the flame path, once the sequencer has been jettisoned from the outer case.

Topic 10 Para 7.

Question 15

What is the CEOFE MT20 used for?
Cartridge, Electrically Operated, Fire Extinguisher, MT20 - Blackhawk
DEOP 701

Answer 15

MT20 is used to release an extinguishing agent from the fire extinguisher in the Blackhawk helicopter.

Topic 10, para 1

Question 16

Why does the CEOFE use 2 squibs?

Answer 16

They both provide sufficient energy to propel the slug with the force required to rupture the frangible disc

thereby providing a REDUNDANCY should one squib fail to operate

Question 17

What is the following used for?
Cartridge Impulse - ARD 863-1A1W

Topic 705

Answer 17

• Used to provide gas pressure to eject various stores and release equipment from various aircraft.

The stores may include bombs, fuel tanks, launchers, racks, pylons and other explosive ordnance.

Question 18

How is the Cart Impulse-ARD initiated?

Topic 10, para 6

Answer 18

Electrically

When the firing current is applied, the bridgewire becomes incandescent causing the ignition composition to ignite

Question 19

30mm name of gun, name of platform

Answer 19

GIAT 30M781 Gun System

ADF ARH Tiger

Question 20

30mm (SAPHEI) Function from setback

Theory - Fill in blanks

Answer 20

• At firing setback drives the firing pin assembly to the rear and compresses the firing pin spring.
• ## At this point the explosive train is still out of alignment to ensure firing safety

Question 21

SAPHEI muzzle safety

What is the muzzle safety distance provided by the spiral spring expanding and controlling the outward travel of the pins?

Answer 21

Minimum of 15 metres

The outward rate of travel of the pins is controlled by the rate at which the spiral spring expands and
hereby provides a muzzle safety distance of a minimum of 15 metres.

Question 22

Label parts of the rocket…(?)

Answer 22

Inductive Plug
Retaining Ring
Spectrum FIlter
Spring Box Assembly
Spacer
Propellant Grain
End Sleeve
Nozzle and Fin Assembly
Wraparound Fins
Sealing Washer
Felt Disc
Stabilising Rod
Rocket Motor Tube
RF filtered Igniter
Igniter Fuze Head

Question 23

Self destruct actioned in what time of flight?
What force(s)/function is involved?

FZ BD MR3005
Cartridge 30mm OSPEI (SAPHEI) F7671

Answer 23

6 - 16 seconds
Spin decay and spring pressure
This will occur as a result of the centrifugal force decaying and allowing the balls to move inwards. The stored energy in the firing pin spring then drives the firing pin forward and the fuze is functioned as normal.

Question 24

What is the purpose of the contact ring?
When is the shorting clip removed?

Rocket Motor 2.75 inch FZ90 Mod 2/S

Answer 24

• It provides the electrical initiation of the rocket via the detent mechanism in the rocket pod.
• only removed immediately prior to loading of the rocket into the pod

Question 25

“352 - initial thrust to boom”

Answer 25

• Forward acceleration of the Laser Guided Rocket causes the Electronic Thermal Battery Initiator (ETBI) within the WGU-59/B to activate the 28Vdc thermal battery.
• The CAS, which controls the wings, boots up and the wings deploy once the Laser Guided Rocket has safely separated from the Tiger ARH
• Approx 1 sec after launch from the Tiger ARH the wings of the WGU-59/B instigate de-roll
• Distributed Aperture Semi Active Laser Seeker (DASALS). The DASALS provides a40-degree forward field of view, which enables it to quickly obtain precise target locations based on the detection of laser radiation reflected from a target being lased
• information from the DASALS along with information from the on-board Inertial Measurement Unit (IMU) enables the WGU-59/B to steer the 2.75” rocket to the target being lased.