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AD/PT6B/1 - Gas Generator Case
Pratt & Whitney Canada Turbine Engines -Pratt & Whitney Canada Turbine Engines - PT6B Series
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Pratt & Whitney Canada Turbine Engines - PT6B Series
| AD/PT6B/1 | Gas Generator Case | 13/2010 |
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| Applicability: | All PT6B-36 and -36A engine models not incorporating:(a) gas generator case P/N 3112048-01 identified by P&WC SB 11041, or(b) superseding parts incorporating the intent of SB 11041, or(c) stiffening plates P/N 3102444-01. |
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| Requirement: | 1. Unless previously accomplished, inspect the gas generator case for seam weld cracking in accordance with Part 2A of the Accomplishment Instructions of P&WC SB 11031R1 or later revision.2. Repair all seam weld cracking in accordance with Part 2B of the Accomplishment Instructions of P&WC SB 11031R1 or later revision. This repair constitutes terminating action of this AD.Note: Transport Canada AD CF-88-01R1 refers. |
| Compliance: | 1. Prior to gas generator cases accumulating 1200 hours time in service since new or within the next 100 hours time in service from the effective date of this AD, whichever occurs last. Thereafter at intervals not exceeding 600 hours time in service.2. Prior to further flight. |
| This Airworthiness Directive becomes effective on 9 July 2010. | |
| Background: | A number of gas generator case longitudinal seam welds have been found cracked. An undetected weld seam crack could lead to the rupture of the pressure vessel and a subsequent unsafe condition. This AD requires dye penetrant inspection of the gas generator case longitudinal seam and repair if found cracked. This AD is issued as a result of an audit of Transport Canada ADs. |
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Mike Higgins
Delegate of the Civil Aviation Safety Authority
22 June 2010