dlm34077(at)gmail.com
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 Posted: Mon Jun 05, 2017 9:07 am Post subject: Heat shield |
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When the aircraft was first flown in 2008, a heat shield of fiberglass mat with a silicon back was used to protect the lower cowl. The baffling and sealing tape was used to properly route cooling air. The solution lasted 1100 hours and 9 years; last year I had an incident which required removal of the baffling material from the engine. It was removed/replaced by a third party; I did not check their work except that I did notice somewhat higher EGTs (30-40F). I did not think this highly important. In May of 2017, I noticed a wart on the external lower cowl which measured to be adjacent to the #6 exhaust tube which passed below #4. Upon further examination, I found two additional area adjacent to the three-in-ones on the bottom of the cowl. These all were delamination of the fiberglass both inside and out due to excessive heat. After about 10 hours of removing the old material and scorched glass, I found the Nomex honeycomb to be intact. another 10 hours and about $300 for new materials, I had laid four additional layers of glass inside, two layers outside, Evercoat and primer on the outside. Further examination of the flow of cooling air, showed misplaced/distorted baffling and no sealing tape. After reinstalling/reshaping the baffling and replacing the missing sealing tape, and placing Fiberfrax under an internal aluminum foil, cowl temperatures are now below what they were prior to the original incident. Lesson Learned. Do not let anyone besides yourself or trusted associates touch your aircraft otherwise check everything they do.
You always learn more than you ever wanted to know
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