Bert Haasnoot

Document ID: FAA-2010-0596-0002
Document Type: Public Submission
Agency: Federal Aviation Administration
Received Date: August 17 2010, at 12:00 AM Eastern Daylight Time
Date Posted: August 18 2010, at 12:00 AM Eastern Standard Time
Comment Start Date: July 14 2010, at 12:00 AM Eastern Standard Time
Comment Due Date: September 13 2010, at 11:59 PM Eastern Standard Time
Tracking Number: 80b32896
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This is comment on Rule

Airworthiness Directives: Pratt and Whitney PW4000 Series Turbofan Engines

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The OEM (P&W) has pointed out to the operators that the AVT shelf cracking has been related to a redesign of the HPC stage 9 vane segments introducing a 24 segment slots design. These segments were introduced with the Ring Case Compressor modification. Meanwhile the OEM issued SB PW4ENG 72-801. This SB introduces redesigned HPC stage 9 vanes with the original 36 segment slot arrangement. Commenter would like to see that SB PW4ENG 72-801 be added to the AD-note as terminating action for the repeat inspection per SB PW4ENG 72-799