Formative 15 Revision

Question 1

If you discovered a UXO fitted with a PD M739A1 fuze, what would be your primary concern?

Answer 1

-A Cocked Striker

Question 2

What projectile in service and recently out of service can the fuze PD M739A1 be fitted to?

Answer 2

• 105mm HOW HE & WP

- 155mm HE

Question 3

What are the safety arrangements of the M739A1 series fuze?

Answer 3

• Firing pin held over SQ det by collapsible spt
• Interrupter blocks flash hole between det and S&A assembly
• M55 det in S&A rotor held out of alignment by setback pin and spinlock detents
• Detents stop delay plunger from moving forward

Question 4

What are the five sub assemblies of the M739A1 fuze?

Answer 4

• Safety and arming
• Setting sleeve
• Crossbar and holder
• Firing pin and detonator
• Delay

Question 5

What are the four modes of operation for the M782 MOFA?

Answer 5

• Proximity
• Electronic time
• PD
• PD Delay

Question 6

Describe the arming sequency for the MOFA M782:

Answer 6

Electrical Arming

• On setback a post launch battery is activated which loads the mission data and confirms data is valid
• Timer starts for electrical arming of the fuze

Mechanical Arming

• S&A are disabled when round is fired
• Setback forces force setback pin rearwards
• Centrifugal forces move spin detents outwards
• Rotor now free to rotate under centrifugal force, retarded by escapement

Question 7

What is the following for the MOFA M782 fuze:

• Height of burst on prox?
• Time increments for ET?
• Delay time in PD Delay?

Answer 7

• 7-9m HOB
• 0.5s - 199.9 in 0.1s increments
• 7ms nominal delay

Question 8

MOFA M782 can only be used on what projectile and what charge?

Answer 8

• 155mm HE M795 projectiles

- MACS M231 or M231A1

Question 9

What are the 6 sub-assemblies for the M782 MOFA?

Answer 9

• Radome
• Electronics
• Detonator delay
• Battery
• Booster
• Safe and arm module

Question 10

What are some considerations when transporting the M767A1 fuze?

Answer 10

• Setting mark must be aligned with setting mark. misalignment indicates battery may have been previously activated.
• Battery life of 15 days
• Once energised fuze cannot be deactivated

Question 11

What stimuli and how much is required to arm the M762A1 and M767A1?

Answer 11

• Setback - 1000g

- Centrifugal - 2100rps

Question 12

What are the authorised projectiles for the M762A1 and M767A1?

Answer 12

M762A1

• Proj 155 Smoke WP M825A1
• Proj 155mm ILLUM M485A2
• Proj SMART DM702A1

M767A1

• Proj 155mm HE M795
• Proj 155mm HE M107

Question 13

What are the authorised platforms for the M762A1 and M767A1?

Answer 13

• 155mm M198 Howitzer towed

- 155mm M777A2 Howitzer towed

Question 14

How can the fuze on the M762A1 and M767A1 be set?

Answer 14

-Manually or inductively to ET or PD

Question 15

What is a booster in relation to a fuze?

Answer 15

-Device attached to the baser of a fuze incorporating a safety and arming mechanism designed to receive initial detonation wave and increase it to function a projectile

Question 16

What is the booster M125A1 fitted to?

Answer 16

• Fuze MTSQ M520A1

- Fuze PD M557

Question 17

What is the safety arm stimuli for the fuze MTSQ M582A1?

Answer 17

Setback
-No arm 300g - Arm 600g
Spin
-No arm 16.7 rps - Arm 30rps

Question 18

What is the difference between the M577A1/M577A1 VECP to the M582A1?

Answer 18

-Identical by design by M582A1 has a booster

Question 19

The MTSQ M582A1 should always be shipped in a safe mode, at what setting?

Answer 19

-Set in the safe mode, with the small triangle marked between 93.5 and 95.5 seconds

Question 20

For PD or SQ function on the MTSQ M582 A1 the fuze is required to be set at what setting?

Answer 20

98.0 secs

Question 21

What type of projectile is the MTSQ M577A1 used to initiate?

Answer 21

-105 and 155 carrier shells

Question 22

What type of projectile is the MTSQ M582A1 used to initiate?

Answer 22

-105 and 155 HE projectiles

Question 23

What does the FZ PROX M732 A2 eliminate?

Answer 23

• Need for deep intrusion prox fuzes

- Removal of supplementary charges

Question 24

List the 5 sub-assemblies for the FZ PROX M732 A2

Answer 24

• Power supple
• Electronic timer
• Safety and arming module
• Oscillator
• Amplifier

Question 25

What is the time setting for the FZ PROX M732 A2 between?

Answer 25

4-156 seconds in 2 second increments

Question 26

How is the battery activated during flight on the FZ PROX M732 A2?

Answer 26

- Setback forces actuate cutters that open the battery ampoule releasing acid - Centrifugal forces disperse acid into cells activiating the battery

Question 27

What modes can the M732 be used in?

Answer 27

- Proximity | - PD

Question 28

the S&A module on the M732 arms after how many calibre of air travel?

Answer 28

400

Question 29

What are the conventional natures of 155mm HOW ammunition currently in service?

Answer 29

- HE M765 - HE M107 - ILLUM M485A2 - WP M825A1

Question 30

Are the MACS propelling charges authorised to be mixed with M3A1 propelling charges in the M777A2?

Answer 30

No

Question 31

What are the Authorised Fuzes used in the ADF for the 155mm Natures?

Answer 31

M107 HE -Fuze; M739A1, M582A1 M732A1 M795 HE -Fuze; M767A1 ET, M782 Multi Option M825A1 Smk WP -Fuze; M762A1 M485A2 Illum -Fuze; M577A1

Question 32

What zones can you fire green and white charge bags on?

Answer 32

- Green authorised for 3-5 only (zones 1-5) | - White authorised 3-7 (zones 3-7)

Question 33

What is the NEQ of the Proj HE M107 and it's supplementary charge?

Answer 33

- 6.99kg COMP B | - 0.136kg COMP B or TNT

Question 34

What is the Filling of the Primer Percussion M82?

Answer 34

22GR of Black Powder

Question 35

Describe the operation of the Proj 155mm from fuze function to candle ejection/illumination

Answer 35

- Interval time on mechanical or electrical time fuze is reached, fuze functions and primary expelling charge is ignited - Ignition generates gas pressure and ignites the delay holder on top of the canister - Gas pressure causes shear pins to fail and contents of projectile are ejected rearwards due to pressure - Drouge parachute deploys bringing internal assembly to a vertical plane. - Spin retardant fins on candle housing deploy, slowing rate of rotation - After approx 8 secs, delay composition burns through and ignites secondary expelling charge - Secondary expelling charge ignites candle and expells candle with a main parachute. - Candle burns for 120secs at 1,000,000 candela

Question 36

What is the authorised fuze for the 155mm SMART M702A1?

Answer 36

-Fuze ET M762A1

Question 37

When the submunitin on the SMART stabilises, what angle does it tilt?

Answer 37

30 degrees

Question 38

At what height does the submunition self destruct in the SMART?

Answer 38

-20m

Question 39

Each submunition in the SMART contains three major sub-components, what are they?

Answer 39

- Orientation and stabilisation unit - Multi mode sensor - Warhead containg S&A mech

Question 40

What are the two variants of the Projectile 155mm HE XM982 Excalibur Block 1A-1?

Answer 40

- Tactical projectile | - Tacitical/telemetry projectile

Question 41

What 3 barrteries are locatin the GNC unit?

Answer 41

- Electronics - Actuator - Data hold

Question 42

The TTM antenna is only present on the TTM variant of the Projectile 155mm HE XM982 Excalibur, true or false?

Answer 42

True RATTGGGDMPH

Question 43

What components make up the Guidance and Navigation Unit?

Answer 43

- Radome - Anti-Jam Module - Telemetry Module - Tactical Telemetry Antenna - GPS antennas - GPS receiver - Guidance and Navigation Unit shell - Data Hold Battery (DHB) - Mission Computer (MC) - Power Conditioning Unit (PCU) - Height of Burst (HOB) sensor

Question 44

What does EPIADS stand for?

Answer 44

Electonric Portable Inductive Artillery Fuze Setter