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AD/AL 250/38 - Idler Gearshafts - Replacement
1AD/AL 250/38 - Idler Gearshafts - Replacement
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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Allison Turbine Engines - 250 Series
AD/AL 250/38 Idler Gearshafts - Replacement 10/79
Applicability: All 250-C28 and -C30 series models fitted with generator idler gearshaft P/N 6898980 or 6898591 and 77 tooth idler gearshaft P/N 6898652.
| Document: | 1. | Allison 250-C28 CEB No. 72-2003; or Allison 250-C30 CEB No. 72-3003; or |
|---|---|---|
| 2. | FAA AD 79-16-06 Amendment 39-3527 also refers. | |
| Compliance: | 1. | For 250-C28 engines: Prior to reaching 9000 cycles. |
| 2. | For 250-C30 engines: Prior to reaching 2000 cycles. | |
| 3. | For engines which may have exceeded the maximum permissible number of cycle at the time of promulgation of this Directive 3 September 1979, within 50 cycles. |
Background: This Directive is issued to prevent sudden power loss due to accessory drive gearbox gearshaft failure.