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28 Cards in this Set
- Front
- Back
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what are 6 AAC checks?
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check1- main accumulator preesure
check2-power evelevation and elevation cylinder check3- fault indicator check4- special input check5-ballistic solution check6-muzzle reference system |
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purpose of main accumulator pressure check?
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the main accumulator pressure check ensures that the system can maintain proper hydraulic pressure
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purpose of power elevation and elevation cylinder check?
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the power elevation and elevation cylinder check ensures that the main gun elevation cylinder responds to elevation inputs and is capable of maintaining the lay of the gun on an aiming point
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purpose of fault indicator check?
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the fault indicator check verifies that the fire control sytem's continuous malfunction detection system and computer self-test have not identified faults that affect direct-fire precision
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purpose of special input check?
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the m1a2sep special input check verifies the proper function of manual and automatic inputs. this check ensures all individually tested component circuits are operational prior to testing full solution data
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purpose of ballistic solution check?
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the ballistic solution check verifies that the FCS is correctly implementing ballistic solutions in all main gun channels.
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purpose of muzzle reference system check?
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the MRS check determines whether the MRS can correct an artificial boresight loss.
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define AAC's
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AAC's help to ensure that the fire control system if fully operational and verifies that special inputs and ballistic solutionsare implemented properly for fire control components and all main gun ammunition.They also verify that the MRS can correct an artificially induced boresight loss.
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what 2 things have to be done before conducting AAC's
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complete a thorough PMCS and
bleed the air from the hydraulic system |
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how do you perform AAC checks?
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perform checks 1-6 in sequence.
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when conducting AAC's what do you do when you find a fault?
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Record faults from each check on a DA form 2404 or DA form 5988-E. All faults must be corrected before performing the next check
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how far should the AAC panel be when conducting checks?
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the tank is on level ground with the solution board 100m +/- 1m from the front slope of the tank
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how often should AAC's be conducted?
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Monthly
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Maximum number of vehicles that conduct AAC's at one time?
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2 is the max .
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if 2 vehicles must conduct AAC's at same time how should they be placed.
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they should be no closer then 2 feet and no more then 4 feet apart. the vehicles should be equally offset from the gun block on the AAC panel
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how is the AAC board placed?
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the tank is on level ground with the solution board 100m +/- 1m from the front slope of the tank and the horizontal reference line on the solution board is level with the gun trunnions.
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what might cause the fire control fault symbol (F) to appear?
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the last fire control sytem test failed
there is no LRF power the range switch on the LRF was not in the safe position when the turret power was turned on there is no thermal imaging system power the automatic self test has detected a fault, and a caution message is displayed in the GCDP |
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during special input checks what are the possible problems that would cause the MBD to not be in the box?
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crew set-up
incorrect boresight not taking the same sight picture with the MBD that was taken during boresighting GCDP not zeroed (i.e. CCF) incorrect entry of checks data into the group problems with the FCS |
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Why do we use heat on check 4?
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heat will induce more superelevation and lead for basic input which will cause the gun to move more pronounced.
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how many expanded AAC checks are there?
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3
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what are the 3 expanded AAC checks?
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check 1-main gun recoil piston sleeve position check
check 2-breech allignment block check check 3- elevation mechanism check |
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purpose of main gun and recoil piston sleeve position check
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the main gun recoil piston sleeve check ensures that the main gun recoil system parts are assembled correctly. An improperly seated recoil piston may cause abnormal ammunition jump characteristics, that is the tank may need a discreet CCF.
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purpose of the breech alignment block check
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the breech alignment block check ensures that the tolerance between the breech alignment block and the breech is correct, which ensures the position of the gun tube is consistent after each round is fired
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purpose of elevation mechanism check
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the elevation mechanism check ensures that the support system is secured properly and does not have excessive movement. Excessive movemnet may result in a continual roud to round dispersion.
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during breech alignment block check what should the distance be between the anti-rotation key and the side of the keyway?
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.005 inch gauge should not go in
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during breech alignment block check what should the distance be between the ramp and the breech (gunners side)
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.005 inch gauge should not go in
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during breech alignment block check what should the distance be between the ramp and the breech (loaders side)
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.006 inch gauge should not go in
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during main gun recoil piston sleeve position check what size feeler gauge should be used to check the postion of the recoil piston sleeve?
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.0012 inch gauge
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