AD 75-17-32

75-17-32 DETROIT DIESEL ALLISON: Amendment 39-2336. Applies to Detroit Diesel Allison Model 501-D13 series engines which incorporate P/N 6829072 second stage turbine wheels with the following serial numbers:

KK14208 KK14421 KK14443 KK14460 KK15456 KK15484 KK14210 KK14422 KK14445 KK14461 KK15457 KK15485 KK14211 KK14423 KK14446 KK14463 KK15471 KK15486 KK14403 KK14424 KK14447 KK14464 KK15472 KK15487 KK14405 KK14427 KK14448 KK14465 KK15473 KK15489 KK14406 KK14428 KK14449 KK14817 KK15474 KK15490 KK14407 KK14430 KK14450 KK14819 KK15475 KK15492 KK14408 KK14431 KK14451 KK14821 KK15476 KK15493 KK14409 KK14432 KK14452 KK14822 KK15477 KK15494 KK14413 KK14434 KK14453 KK14823 KK15478 KK15495 KK14414 KK14435 KK14454 KK14825 KK15479 KK15496 KK14416 KK14436 KK14455 KK15451 KK15480 KK15497 KK14417 KK14437 KK14456 KK15452 KK15481 KK15498 KK14418 KK14440 KK14457 KK15453 KK15483 KK15500KK14420 KK14442 KK14459 KK15454

Note: At time of overhaul, some wheels have R1, R2, R3, R4 or R5 added as a suffix to the wheel serial number. The suffix should be disregarded in determining the applicability of this airworthiness directive.

Compliance required as indicated.

I. Remove from service wheels which have not been inspected since installation as new wheels, according to the following schedule:

(a) Remove from service within 100 cycles from the effective date of this Airworthiness Directive, wheels with more than 6900 cycles.

(b) Remove from service prior to exceeding 7000 cycles, wheels with not more than 6900 cycles, on the effective date of this Airworthiness Directive.

II. Remove from service wheels which have been inspected by fluorescent penetrant method FP- 30A/ZL-30A at last inspection, according to the following schedule:

(a) Remove from service within 100 cycles from the effective date of this Airworthiness Directive, wheels with more than 3900 cycles since last inspection or more than 9400 total cycles, whichever occurs first.

(b) Remove from service prior to exceeding 4000 cycles since last inspection or 9500 total cycles, whichever occurs first, wheels with not more than 3900 cycles since last inspection or not more than 9400 total cycles on the effective date of this Airworthiness Directive.

Note: If the method of fluorescent penetrant inspection used at last inspection cannot be determined, it must be assumed that FP-30A/ZL-30A was not used.

III. Remove from service wheels which have been inspected by a fluorescent penetrant method other than FP-30A/ZL-30A at last inspection, according to the following schedule:

(a) Remove from service within 100 cycles from the effective date of this Airworthiness Directive, wheels with more than 2400 cycles since last inspection, or more than 9400 total cycles, whichever occurs first.

(b) Remove from service prior to exceeding2500 cycles since last inspection or 9500 total cycles, whichever occurs first, wheels with not more than 2400 cycles since last inspection or not more than 9400 total cycles on the effective date of this Airworthiness Directive.

IV. or the purposes of this airworthiness directive, a cycle is defined as one takeoff.

V. Detroit Diesel Allison Commercial Service Letter 501D13 CSL-234 pertains to this subject.

This amendment is effective August 14, 1975.