In the November 2009 Duncan Intelligence, we discussed replacement of the fuel filter bypass valve in the PW615F-A engine per SB A63069. At that time, SB A66019 was out and called for inspection of the bypass valve only in the PW617F-E engines. SB A66019 has now been cancelled and superseded by SB A66021, calling for replacement of the bypass valve in the PW617F-E engines also.
We recommend that you comply with this Service Bulletin immediately, possibly avoiding the FMU change.
Commercial Support Program Notification # 1004825R01 has been released by Pratt & Whitney providing parts and labor support for operators.
For questions about this or other Technical issues, contact your Duncan Aviation Pratt & Whitney Tech Reps.
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