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ATO Course > Detailed Study - Mortars > Flashcards

Detailed Study - Mortars Flashcards

1
Q

How does the Fuze PD M935 (sq or DLY) operate?

A
  • rotating slotted shaft is adjusted
  • pull wire is removed
  • on firing, acceleration moves setback pin rearward, freeing ball detent which frees spring loaded firing pin
  • creep forward partially releases detonator slider
  • second firing pin ignites the delay element for 2-6 seconds
  • burning pin from slider is moved which arms the PD or delay.
  • on impact, firing pin functions PD or DLY det, which functions the main fill
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2
Q

how does the Fuze M734 function on firing?

A

set back sensor experiences setback and releases first rotor lock (zigzag). when fully set back, the setback sensor locks in place.

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3
Q

How does M734 function during flight

A
  • air ingested through venturies to power turbine generating electricity
  • turbine also drives mechanical gear train which retracts second lock.
  • predetermined amount of spins before arming, 100m min mechanical arming distance
  • electronics monitor V and F and provide fuze with an electrical function delay
  • On release of second rotar lock, rotor rotates 180 degrees into armed position
  • the fuze is now armed
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4
Q

Prx, NSB IMP and DLY use what type of detonators?

A

PRX, NSB and IMP all use electric det

DLY uses only mechanical with no electric circuitry. serves as a back up to the electric fuzes

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5
Q

how does PD M751 function?

A

will always function on impact regardless of selected fuze setting. firing pin strikes ball which strikes primer which initiates pyro spotting charge

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6
Q

60mm M888 tab data (Primer type, how many primer charges, main fill, distance)

A

M10 flake propellant propellant, 4, Comp B, max range approx 3500m

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7
Q

60mm M722A1 WP tab data (Primer type, how many primer charges, main fill, distance)

A

M10 flake propellant, 4 , WP with M85 Burster, Not listed

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8
Q

60mm M769 Prac tab data (Primer type, how many primer charges, main fill, distance)

A

M10 flake propellent, 4, inert and approx 3600m

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9
Q

81mm M889A2 HE tab data (Primer type, how many primer charges, main fill, distance)

A

M83 ball, 4 , COMP B, 63 to 5470m

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10
Q

60mm ILLUM tab data (Primer type, how many primer charges, main fill, distance)

A

M10 flake propellant, 4, illum candle unknown, 3.2 to 3.8

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11
Q

60mm IR ILLUM tab data (Primer type, how many primer charges, main fill, distance)

A

M10 flake propellant, 4, illum candle unknown, 0.2 to 3.8

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12
Q

Cart 81MM HE M821A1 FUZE M 734 (Primer type, how many primer charges, main fill, distance)

A

(M9,4,-COM A5, 63 - 5470m

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13
Q

CART 81MM IR ILLUM (Primer type, how many primer charges, main fill, distance)

A

M38 ball, 2-4, illuminate comp and between 1025 and 4925

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14
Q

CAART 81MM ILLUM (Primer type, how many primer charges, main fill, distance)

A

M219, 2-4, 475m height, 525000 candella for 50 seconds 1200m diameter (300m - 5050m)

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15
Q

CART 81mm SMK RP (Primer type, how many primer charges, main fill, distance)

A

M38,4, RED PHOS, 300-4900

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16
Q

CART 81MM Mortar (Primer type, how many primer charges, main fill, distance)

A

M9, 4, flash/sound, 309-5600m

17
Q

60mm M888

operating temp and storage temp

A

operating temp -46 to 63

Storgae -51 to 71

18
Q

60mm M888

at what height would HE M888 be unservicable if dropped

A

1m

19
Q

60mm M722A1 WP

how are the fuzes M734 and M783 related?

A

M734 have all 4 options available (Prox, NSB, IMP and DEL)
M783 have the option of all 4 but is purely mechanical (IMP and Delay)
Intended for tactical training but can be used operationally.

20
Q

60mm M722A1 WP
Fill the blank

Operators using the Cart 60mm WP M722A1 in training or combat at temperatures near
(__)or below should be aware of an increased likelihood of duds or UXOs, or delay backup functions when firing at charge 0.

A

-31

21
Q

60mm M722A1 WP

How does the mortar round operate

A

Mortar Operation. M722A1 is loaded fin-end first into the mortar barrel.
The ignition cartridge functions and ignites the propelling charge.
Combustion gasesfrom the ignition cartridge and propelling charges propel the cartridge out of the barrel. On impact, the fuze functions.
The fuze initiates the burster charge. The burster charge ruptures the shell and disperses the WP filler. The WP
produces smoke upon exposure to the air.

22
Q

60mm M722A1 WP

If set to PRX what fuze setting will the fuze default to?

A

IMP

23
Q

CARTRIDGE 60MM FULL RANGE PRACTICE ROUND

What should you be aware of if the packing clip is not seen or a red band on the striker is visible

A

Force applied to the nose of an armed fuze can result in
ignition of propelling charge. Do not attempt to fire a M769 with an armed fuze.
Remove cartridge for disposal without striking nose of fuze.

24
Q

CARTRIDGE 81MM HE M889A2 W/FUZE PD M783

at what temp are duds and uxo more likely?

A

-31 degrees

25
Q

CART 60MM MORTAR ILLUM (VL) M721 FZD MTSQ M776

between What time ranges can the MTSQ function during flight?

A

6 to 54 seconds

26
Q

CART 60MM MORTAR ILLUM (VL) M721 FZD MTSQ M776

what is the candlepower of its main charge?

A

250,000 candella

27
Q

CART 60MM ILLUM (IR) M767 FZD MTSQ M776

what is the candela and range the IR fill provides?

A

500 (at the near IR wavelength of the electromagnetic part of the
spectrum (between 60 to 90µm))

28
Q

CART 60MM ILLUM (IR) M767 FZD MTSQ M776

what is the arming distance?

A

131 ft (40m) minimum

29
Q

CART 81MM HE M821A1 Fuze M734

what is the g force required to arm the fuze?

A

Setback force 225g No Arm, Setback 375g All arm

30
Q

CARTRIDGE 81MM MORTAR INFRARED (IR) ILLUMINATING M816
FUZED MTSQ M772
arming set back required?

A

400g

31
Q

CARTRIDGE 81MM MORTAR INFRARED (IR) ILLUMINATING M816
FUZED MTSQ M772
Why is it inadvisable to fire at no charge or 1 charge?

A

no charge - danger

1 charge- illuminate gun position

32
Q

CARTRIDGE 81MM MORTAR INFRARED (IR) ILLUMINATING M816
FUZED MTSQ M772
What is the candle deployment height and burn time

A

600m and 60 seconds

33
Q

CART 81MM ILLUM M853A1 W/FUZE MTSQ M772

what is the minimum distance for arming?

A

40m (0.8 seconds)

34
Q

CART 81MM ILLUM M853A1 W/FUZE MTSQ M772

what is the burn time and candle power?

A

50 sec and 525,000 candella

35
Q

CARTRIDGE, 81MM, MORTAR,
SMOKE, RED PHOSPHOROUS (SMK RP), M819
FUZED MECHANICAL TIME SUPER QUICK (MTSQ) M772
what is teh deployment height?

A

175m

36
Q

CARTRIDGE, 81MM, MORTAR,
SMOKE, RED PHOSPHOROUS (SMK RP), M819
FUZED MECHANICAL TIME SUPER QUICK (MTSQ) M772
Smoke effects?

A

Volley of 3 carts will provide screening for approx 5 minutes under ideal atmospheric conditions

37
Q

CARTRIDGE, 81MM, MORTAR,
SMOKE, RED PHOSPHOROUS (SMK RP), M819
FUZED MECHANICAL TIME SUPER QUICK (MTSQ) M772
what is the daily firing limit?

A

160 rounds

38
Q

CARTRIDGE, 81MM. MORTAR, TARGET PRACTICE (TP), M879 FUZED
POINT DETONATING (PD), PRACTICE, M751
what are the terminal effects ?

A

Flash noise and smoke.

ATO Course (20 decks)

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