TM 1-1520-238-T-10 Section IV. EFFECTIVITY CODES The effectivity codes and helicopter serial number blocks for the AH-64A helicopter are as follows: Effectivity Code Helicopter Serial No. Effectivity Code AAA AAB AAC AAD AAE AAF AAG AAH AAJ AAK AAL AAM AAN AAP AAQ AAR AAS AAT AAU AAV AAW AAX AAY AAZ ABA ABB ABC ABD ABE ABF ABG ABH ABJ ABK ABL ABM ABN ABP 82-23355 THRU 82-23365 82-23355 THRU 83-23798 82-23355 THRU 83-23814 85-25424 AND SUBSEQUENT 82-23355 THRU 84-24231 84-24216 AND SUBSEQUENT 82-23355 THRU 84-24289 82-23355 THRU 85-25398 85-25351 AND SUBSEQUENT 82-23355 THRU 85-25488 88-0215 AND SUBSEQUENT 85-25465 AND SUBSEQUENT 83-23787 THRU 85-25415 82-23355 THRU 88-0214 82-23355 THRU 84-24311 82-23355 THRU 84-24239 84-24240 AND SUBSEQUENT 82-23355 THRU 83-23804 83-23787 AND SUBSEQUENT 83-23805 AND SUBSEQUENT 83-23799 AND SUBSEQUENT 83-23799 THRU 84-24245 83-23799 THRU 85-25470 (BEFORE MWO 1-1520-238-50-37) 83-23815 AND SUBSEQUENT 84-24200 AND SUBSEQUENT 84-24246 AND SUBSEQUENT 84-24290 AND SUBSEQUENT 82-23355 THRU 85-25415 82-23355 THRU 84-24295 84-24296 AND SUBSEQUENT 85-25399 AND SUBSEQUENT 82-23355 THRU 84-24245 85-25447 AND SUBSEQUENT 82-23355 THRU 85-24446 82-23355 THRU 89-0215 84-24290 THRU 88-0199 89-0192 AND SUBSEQUENT 85-25471 AND SUBSEQUENT ABQ ABR ABS ABT ABU ABV ABW ABX ABY ABZ ACA ACB ACC ACD ACE ACF ACG ACH ACJ ACK ACL ACM ACN ACP ACQ ACR ACS ACT ACU ACV ACW Helicopter Serial No. 86-8940 AND SUBSEQUENT 82-23355 THRU 84-24232 84-24233 AND SUBSEQUENT 82-23355 THRU 83-23816 83-23817 THRU 85-25415 84-24246 THRU 85-25398 82-23355 THRU 83-23795 83-23796 AND SUBSEQUENT WITH T700-GE 701 ENGINES WITH T700-GE 701C ENGINES 82-23355 THRU 88-0199 88-0200 AND SUBSEQUENT 82-23355 THRU 83-23834 85-25416 AND SUBSEQUENT 82-23355 THRU 86-9011 82-23355 THRU 88-0284 89-0192 AND SUBSEQUENT 82-23355 THRU 85-25423 82-23355 THRU 90-0290, 90-0292 THRU 90-0301 (BEFORE MWO 1-1520-238-50-07) 82-23355 THRU 90-0290, 90-0292 THRU 90-0301 (AFTER MWO 1-1520-238-50-07) 90-0291, 90-0302 AND SUBSEQUENT 82-23355 THRU 83-23814 83-23815 AND SUBSEQUENT 85-25471 THRU 90-0448 (BEFORE MWO 1-1520-238-50-37) 85-25471 THRU 90-0448 (AFTER MWO 1-1520-238-50-37) 90-0449 AND SUBSEQUENT 82-23355 THRU 90-0448 (BEFORE MWO 1-1520-238-50-36) 82-23355 THRU 90-0448 (AFTER MWO 1-1520-238-50-36) 90-0449 AND SUBSEQUENT 82-23355 THRU 90-0437 90-0438 AND SUBSEQUENT 82-23355 THRU 90-0436 89-0192 THRU 90-0434 WITH T700-GE-701C ENGINES (BEFORE MWO 1-1520-238-50-38) 89-0192 THRU 90-0434 WITH T700-GE-701C ENGINES (AFTER MWO 1-1520-238-50-38) 90-0435 AND SUBSEQUENT WITH T700-GE-701C ENGINES 90-0479 AND SUBSEQUENT ACX Change 6 1-14.1