Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

AT Course_NE > Test 14 - ARH & Blackhawk > Flashcards

Test 14 - ARH & Blackhawk Flashcards

1
Q

Label the following Figure of Fuze MR3005 fitted to the 30mm OSPEI (SAPHEI)?

A
  1. Priming relay
  2. Rotor
  3. Centrifugal pin (locking finger)
  4. Two spirals (double spiral)
  5. Firing pin springs
  6. Self destruction ramp
  7. Rotor spiral spring
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the minimum muzzle safety of the 30mm OSPEI (SAPHEI)?

A

15m

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

At what point in flight will the projectile from the 30mm OSPEI (SAPHEI) self-destruct?

A

between 6 – 16 seconds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the arming requirements of the Warhead 2.75” HEGP FZ Mod 5 Fzd Mk 352 Mod FZ-5

A
  • Setback – 55g
  • Spin – 14 Hz
  • 0.7 to 0.9 seconds***
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Fill in the blanks of the statement below of the operation of the Warhead 2.75” HEGP FZ Mod 5 Fzd Mk 352 Mod FZ-5?

A
  1. setback weight
  2. spring loaded
  3. Centrifugal
  4. escapement mechanism
  5. rotor flange
  6. rotor
  7. firing pin
  8. detonator
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the maximum indirect firing range of the Rocket Motor 2.75” FZ 90 Mod 2/S?

A

Direct – 5.0 km

Indirect – 9.18 km

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the purpose of the spring in the spring box assembly situated behind the igniter?

A

maintains the propellant in position as it expands or contracts due to temperature or age.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Label the diagram below of a Rocket Motor 2.75” FZ 90 Mod 2/S? (8)

A
  1. inductive plug
  2. spectrum filter
  3. spring box assembly
  4. propellant grain
  5. wraparound fins
  6. stabilising rod
  7. RF filtered igniter
  8. igniter fuze head
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The payload of the Flare Countermeasure Infra-Red has a weighted nose, why?

A

increase inertia and thus reduce the deceleration of the payload.
stainless steel is to provide both high mass and corrosion resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is one of the functions performed by the adhesive backed aluminium wrap which surrounds the IR pellets in the Flare Countermeasure Infra-Red DSTL 22?

A

The wrap:

  • acts as an environmental seal for the IR pellets
  • promotes primer propagation by acting as a momentary gas seal
  • serves as the safety function of protecting the IR pellets from inadvertent ignition.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The CEOFE MT20 Blackhawk contains two squibs, why?

A

to provide a Redundancy should one fail

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the purpose of the sequencer in the Flare Countermeasure Infra-Red DSTL 22?

A

To ignite the IR pellets only after the payload has cleared the dispenser; ignition of the IR pellets is positively prevented whilst the payload is being ejected.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the explosive fill in the Warhead 2.75 inch HEGP FZ 71 MOD 5 FZD MK 352 MOD FZ-5

A 
Comb B (RDX, TNT 60/40)
1.05KG
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In regards to the flare countermeasure infra-red DSTL 22 what is it’s burn time pulse duration and velocity?

A

Burn time - 5 sec max
Pulse duration - 10ms
Ejection velocity - 35 to 55 m/sec

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the role and how does the cartridge impulse - ARD 863-1A1W work.

A

It is used to eject various stores and release equipment from aircraft
including: bombs, fuel tanks, launchers, racks, pylons and other EO

  • It is electrically intiated and the bridge wire becomes incandescent causing the ignition composition to ignite
  • Resultant flash ignites the ignition charge and inturn the propellant charge.
  • High-pressure gas generated by burning propellant operates store release/ejector mechanism.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the name of the HE warhead

A

Warhead 2.75 inch HEGP FZ 71 MOD 5

FUZED MK 352 FZ-5 with booster

17
Q

What does the M352 fuze produce

A

8000 small splinters

18
Q

What are the components of the Fuze MR3005? (5)

A
  • Fz Base
  • Fz Body
  • Rotor Assy
  • Firing Pin Assy
  • Priming Relay
19
Q

What is the explosive fill of the F7671?

A

HEXAL - 16 grams

  • RDX (73%)
  • Aluminium (23%)
  • Wax (4%)
20
Q

What targets are the F7671 designed to be used against?

A
  • Helicopters and other slow moving aircraft

- non-armoured and light armoured vehicles.

21
Q

What is the F7671 designed to be fired from?

A

GIAT 30M781 Gun System of the ARH.

22
Q

Describe Firing of SAPHEI F7671 from setback?

A
  • 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.
  • The centrifugal force generated as the projectile moves up the barrel expands the spiral spring surrounding the half casings outwards until it is pushed against the outer wall of the cavity.
  • The centrifugal force also acts on the centrifugal pins pushing them outwards.
  • The outward rate of travel of the pins is controlled by the rate at which the spiral spring expands and thereby provides a muzzle safety distance of a minimum of 15 metres.
  • When the spiral spring is fully expanded the centrifugal pins drop out of the lower half casing into the space created by the expanded spiral spring.
  • Once the centrifugal pins are free of the rotor detents the rotor is unlocked and, due to an off balance centre of gravity, moves to the aligned position.
  • The centrifugal forces at firing also act on the balls in the ball holder forcing them outwards and the double spiral springs in the firing pin assembly expanding them outwards in the same manner as the rotor spiral spring.
  • Once the double spiral springs are fully expanded and against the outer surface of the cavity they no longer restrict the movement of the ball holder.
  • When the force of the firing pin spring is greater than that of the setback force, the firing pin will begin to move forward.
  • However, the forward movement of the firing pin is impeded by the balls acting on the self-destruct ramp.
  • At this point the fuze is in the fully armed condition and is at least 15 metres from the barrel of the gun.
  • Once the fuze is armed, if an impact occurs, the inertia will drive the firing pin forward and force the balls past the ramp allowing the firing pin to strike the detonator primer.
  • This will initiate the detonator primer which in turn will function the priming relay.
  • This boosts the detonator output sufficiently to initiate the high explosive filling in the body of the projectile.
  • The resulting detonation causes the projectile to rupture into a large number of fragments.
  • A small delay occurs from the time of impact to the time of detonation due to the operation of the firing mechanism.
  • This delay allows the projectile to penetrate the target prior to detonation occurring. If the projectile has not impacted a target at a point between 6 and 16 seconds time of flight the projectile will self destruct.
  • 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.

AT Course_NE (23 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions