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#1
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Dennis
We appreciate the comments made by anyone who has any involvement with Skymasters.
Thank you for sharing with us. A couple of comments, questions. First, The New Jersey accident, I thought, involved a Super Skyrocket, a pressurized airplane. I would have assumed that it had the strengthened wing. Do you mean that all pressurized Skymasters don't have the same strengthened wing?? In other words, they are not all created equal. Second, the straps on top of the wing are only for those aircraft that do not have the 150 gallon capacity wing, and have Flint tanks? Do aircraft that do not have the 150 gallon wing, and don't have Flint tanks going to need this reinforcement? I have seen on other types of aircraft, a need for a spar inspection. This frequent, and frequently expensive inspection is waived, if there is a spar replacement. Would not a spar replacement, incorporating spar used in the stronger wing, be a better solution than straps on top of the wing?? Thank you, 
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#2
12-03-10, 01:03 AM
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Quote:
The upcoming AD for aircraft modified with Flint Aero extended wing tip fuel tanks will only be for "short wing" 337s modified with Flint Aero extended wing tip fuel tanks as far as we can tell right now. Until the FAA signs off on our findings we can only speculate but I can say that I am very comfortable with the work of my engineer and the feedback I have received from the FAA on our preliminary findings.If you don't have the Flint Aero tips you would not be effected by this AD. If you have wing tip extensions manufactured by Aviation Enterprises you would be required to follow the instructions in that AD. However, the accident in Avon Park may bring into question the non-modified 337 wing. Since the accident in New Jersey the focus has been only on 337s with extended wing tips. A replacement of the spar will not be required in addressing the issues incorporated in the forthcoming AD for 337s modified with Flint Aero tip tanks. There may be other ways to address the issue but we think our solution is one that addresses the issue in the most economically feasible way. According to my engineer, and he has been in this trade for many years, this has been done before on other aircraft. Last edited by Denhamblin : 12-03-10 at 01:06 AM.
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#3
12-03-10, 03:04 PM
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Second C337 Down Due To Wing Failure
Copy of email message sent today :
----- Original Message ----- From: Alfonso Diaz del Castillo To: Dennis Hamblin ; jose.obregon@ntsb.gov ; william.o.herderich@faa.gov Cc: Alfonso Diaz del Castillo Sent: Friday, December 03, 2010 9:51 AM Subject: SECOND C337 DOWN DUE TO WING FAILURE Hello Dennis and (Jose and William), it has been sometime since our last communication. I hope you all are doing well. Dennis, thank you for posting in the Cessna Pilot Association’s (CPA) web board, your article of the additional and pending Airworthiness Directive (AD) for the Cessna Skymasters. Please email me the complete list of all the Skymaster forums that are out there, as it will be very helpful. I am a member of CPA, but it is not a Skymaster forum per se. In your article posted in CPA you mention that the recent C337 incident in Avon Park, Florida, does not have wing tip extensions. Have you check with the NTSB or the FAA to verify that it positively did not have now or before Aviation Enterprises winglets? I believe the winglets could provide for bending, pulling and pushing effects on the wing, and could have had some effect in both incidents, in addition to the fuel wing tip extensions. Thank you for your input and best regards, Alfonso Diaz del Castillo - (C336 - N695AD) Phones: Cell 202-309-3969 - Office 571-227-2208 - Home 301-934-9100 - Fax 301-934-2111 ----- Original Message ----- From: Alfonso Diaz del Castillo To: jose.obregon@ntsb.gov ; william.o.herderich@faa.gov Cc: Fiestair@erols.com Sent: Friday, March 26, 2010 8:09 AM Subject: THREE PICTURES OF A SKYMASTER WINGLET Good morning William and Jose. Enclosed are three pictures of a winglet on a Skymaster C337 that I took on Oshkosh last year (I believe it is an Aviation Enterprises winglet). It may be helpful to you in visualizing how big it really is and how it may have affected the flexing of the wing on the accident C337 aircraft under your investigation, especially if it is not perfectly aligned with the centerline of the aircraft. I hope these pictures are helpful to you. Best regards, Alfonso Diaz del Castillo - N695AD Phones: Cell 202-309-3969 - Office 571-227-2208 - Home 301-934-9100 Fax 301-934-2111
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