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37 Cards in this Set
- Front
- Back
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What is the purpose for Expanded AAC's?
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Expanded AAC checks have been added to provide more in-depth checks of the main gun and functioning of FCS components.
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What is the purpose of AAC's?
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AAC's help ensure that the fire control system is fully operational and verifies that special inputs and ballistic solutions are implemented properly for the fire control components and Main gun ammunition. They also verify that the MRS can correct an artificially induced boresight loss.
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What are the 6 AAC's?
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1) Main Accumulator Pressure Check
2) Power Elevation and Elevation Cylinder 3) Fault Indicator 4) Special Input 5) Ballistic Solution 6) Muzzle Reference System |
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What is the Purpose of AAC check 1?
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The Main Accumulator Pressure Check ensures that the system is and can maintain proper hydraulic pressure.
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What is the purpose of AAC check 2?
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The power elevation and elevation cylinder check ensure 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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What is the purpose for AAC check 3?
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The fault indicator check verifies that the fire control system's continuous malfunction detection system and computer self-test have not identified faults that affect direct-fire precision.
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What is the purpose of AAC check 4?
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The M1A2 SEP 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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What is the purpose of AAC check 5?
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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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What is the purpose of AAC check 6?
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The MRS check determines whether the MRS can correct an artificial boresight loss.
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What are the 3 Expanded AAC's
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1) Main Gun Recoil Piston Sleeve Position Check.
2) Breech Alignment Block Check. 3) Elevation Mechanism Check |
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What is the purpose of expanded AAC 1?
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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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What is the purpose of expanded AAC 2?
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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 fired
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What is the purpose of expanded AAC 3?
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The elevation mechanism check ensures that the support system is secured properly and does not have excessive movement. Excessive movement may result in round-to-round dispersion.
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What is the purpose of the Superelevation AAC Check?
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Using the FCS inputs that approximate those used during screening for both KE and HEAT training rounds, determine if FCS computes and implements the correct superelevation.
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Before conducting AAC's, what must be accomplished?
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Thorough PMCS and bleed the air from the hydraulic system.
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Since we know that Special Inputs and Ballistic Solution Checks do not test FCS components, what do they do?
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They test the ability of the TMPU to compensate for the values received from these components and determine ballistic solution for a given round.
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Why is a vinyl board not recommended for a solution board?
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A Vinyl board will expand and contract with weather and environmental conditions.
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When checking the distance between the Anti-rotation key and the side of the key way, what size feeler gauge do you use?
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.005 in feeler gauge
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When doing the Main Accumulator Pressure check, what two main conditions are required to perform this check?
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All personal are clear of the main gun and the hydraulic aux pump is turned off.
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What is the distance to the solution board?
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100 Meters +/- 1 meter from the front edge of the tank hull.
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How often are AAC's preformed?
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Once a month
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AAC's are conducted with how many vehicles at once?
What is the Alternate? |
1 Vehicle with the solution board centered is preferred, if 2 are used they must have a minimum of 2 ft and no more than 4 ft between the vehicles with the board centered between the two, with the solution board 100 meter +/- 1 meters from the front edge of the tank hull.
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If the Fire Control Symbol (F) appears what has the continuous malfunction detection system detected?
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1) The last Fire Control System test failed.
2) There is no LRF power. 3) The range switch on the LRF was not in the safe position when the turret power was turned on. 4) There is no TIS power 5) The automatic self test has detected a fault, and a caution message is displayed in the GCDP. |
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When performing Special Inputs and Ballistic Solution Checks, what must be used on the MBD? (To reduce operator error and attempt to keep same sight picture)
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Parallax shield
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When doing expanded ACC Check 1, what is the allowable tolerance between the parts of the recoil system?
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.012 in
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What do you do if you fail one or more Ballistic Solution tests?
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Notify Unit Maintenance
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How do you preform AAC's?
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Perform steps one through 6 in sequence.
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What is the maximum Azimuth tolerance when using the solution board?
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.25 mils to 1000 meters
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During AAC check 3, is the TIS fault indicator is on, what do you do?
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Notify Organizational Maintenance
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Prior to starting the actual input checks on AAC Check 4, what do you have to check on the CDU?
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Check the software data version
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What can occur if you do not null out NORMAL and EMERGENCY mode drifts before the Ballistic Solutions check?
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False tests results may occur
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During check 6, I induce a .5 mil boresight loss to the left. What are my tolerances during MRS update?
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Right .65, Right .35
Up .15, Down .15 |
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Except for realignment of the collimator by a turret mechanic, is there anyway to correct a failure of the MRS to restore boresight reference?
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No, you must do a total re-boresight
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How many Ballistic Solution Checks are there?
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52
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If there is a improperly seated recoil piston, what may occur?
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Abnormal jump characteristics
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When checking the alignment of the breech alignment block, what is the feeler gauge used?
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.006 in feeler gauge
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What two conditions must be met for superelevation check?
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Complete prep to fire checks
Passed computer self test and hydraulic pressure check |
