Formative 15 Revision Flashcards
If you discovered a UXO fitted with a PD M739A1 fuze, what would be your primary concern?
-A Cocked Striker
What projectile in service and recently out of service can the fuze PD M739A1 be fitted to?
- 105mm HOW HE & WP
- 155mm HE
What are the safety arrangements of the M739A1 series fuze?
- 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
What are the five sub assemblies of the M739A1 fuze?
- Safety and arming
- Setting sleeve
- Crossbar and holder
- Firing pin and detonator
- Delay
What are the four modes of operation for the M782 MOFA?
- Proximity
- Electronic time
- PD
- PD Delay
Describe the arming sequency for the MOFA M782:
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
What is the following for the MOFA M782 fuze:
- Height of burst on prox?
- Time increments for ET?
- Delay time in PD Delay?
- 7-9m HOB
- 0.5s - 199.9 in 0.1s increments
- 7ms nominal delay
MOFA M782 can only be used on what projectile and what charge?
- 155mm HE M795 projectiles
- MACS M231 or M231A1
What are the 6 sub-assemblies for the M782 MOFA?
- Radome
- Electronics
- Detonator delay
- Battery
- Booster
- Safe and arm module
What are some considerations when transporting the M767A1 fuze?
- 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
What stimuli and how much is required to arm the M762A1 and M767A1?
- Setback - 1000g
- Centrifugal - 2100rps
What are the authorised projectiles for the M762A1 and M767A1?
M762A1
- Proj 155 Smoke WP M825A1
- Proj 155mm ILLUM M485A2
- Proj SMART DM702A1
M767A1
- Proj 155mm HE M795
- Proj 155mm HE M107
What are the authorised platforms for the M762A1 and M767A1?
- 155mm M198 Howitzer towed
- 155mm M777A2 Howitzer towed
How can the fuze on the M762A1 and M767A1 be set?
-Manually or inductively to ET or PD
What is a booster in relation to a fuze?
-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
What is the booster M125A1 fitted to?
- Fuze MTSQ M520A1
- Fuze PD M557
What is the safety arm stimuli for the fuze MTSQ M582A1?
Setback
-No arm 300g - Arm 600g
Spin
-No arm 16.7 rps - Arm 30rps
What is the difference between the M577A1/M577A1 VECP to the M582A1?
-Identical by design by M582A1 has a booster
The MTSQ M582A1 should always be shipped in a safe mode, at what setting?
-Set in the safe mode, with the small triangle marked between 93.5 and 95.5 seconds
For PD or SQ function on the MTSQ M582 A1 the fuze is required to be set at what setting?
98.0 secs
What type of projectile is the MTSQ M577A1 used to initiate?
-105 and 155 carrier shells
What type of projectile is the MTSQ M582A1 used to initiate?
-105 and 155 HE projectiles
What does the FZ PROX M732 A2 eliminate?
- Need for deep intrusion prox fuzes
- Removal of supplementary charges
List the 5 sub-assemblies for the FZ PROX M732 A2
- Power supple
- Electronic timer
- Safety and arming module
- Oscillator
- Amplifier
What is the time setting for the FZ PROX M732 A2 between?
4-156 seconds in 2 second increments
How is the battery activated during flight on the FZ PROX M732 A2?
- Setback forces actuate cutters that open the battery ampoule releasing acid
- Centrifugal forces disperse acid into cells activiating the battery
What modes can the M732 be used in?
- Proximity
- PD
the S&A module on the M732 arms after how many calibre of air travel?
400
What are the conventional natures of 155mm HOW ammunition currently in service?
- HE M765
- HE M107
- ILLUM M485A2
- WP M825A1
Are the MACS propelling charges authorised to be mixed with M3A1 propelling charges in the M777A2?
No
What are the Authorised Fuzes used in the ADF for the 155mm Natures?
M107 HE
-Fuze; M739A1, M582A1 M732A1
M795 HE
-Fuze; M767A1 ET, M782 Multi Option
M825A1 Smk WP
-Fuze; M762A1
M485A2 Illum
-Fuze; M577A1
What zones can you fire green and white charge bags on?
- Green authorised for 3-5 only (zones 1-5)
- White authorised 3-7 (zones 3-7)
What is the NEQ of the Proj HE M107 and it’s supplementary charge?
- 6.99kg COMP B
- 0.136kg COMP B or TNT
What is the Filling of the Primer Percussion M82?
22GR of Black Powder
Describe the operation of the Proj 155mm from fuze function to candle ejection/illumination
- 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
What is the authorised fuze for the 155mm SMART M702A1?
-Fuze ET M762A1
When the submunitin on the SMART stabilises, what angle does it tilt?
30 degrees
At what height does the submunition self destruct in the SMART?
-20m
Each submunition in the SMART contains three major sub-components, what are they?
- Orientation and stabilisation unit
- Multi mode sensor
- Warhead containg S&A mech
What are the two variants of the Projectile 155mm HE XM982 Excalibur Block 1A-1?
- Tactical projectile
- Tacitical/telemetry projectile
What 3 barrteries are locatin the GNC unit?
- Electronics
- Actuator
- Data hold
The TTM antenna is only present on the TTM variant of the Projectile 155mm HE XM982 Excalibur, true or false?
True RATTGGGDMPH
What components make up the Guidance and Navigation Unit?
- 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
What does EPIADS stand for?
Electonric Portable Inductive Artillery Fuze Setter
