Dirty King Air stacks are taken to the cleaners

EBACE Convention News » 2006
November 28, 2006, 10:00 AM

A visit to Frakes booth will not only reveal how to avoid getting ugly exhaust stack soot stains on turboprop nacelles but also how to prevent oil stains from forming. For while Joe Frakes is famed for his company’s replacement exhaust stacks, Wayne Butterfield is sharing his booth to publicize systems dedicated to eliminating oil residue and other exhaust stains from King Air nacelles.

Clean running exhaust stacks prevent a build-up of smoke stains that can disfigure an otherwise pristine executive turboprop aircraft within a matter of hours. Frakes’ solution to the problem is to substitute his refined stack design produced from a highly polished metal and supplied with a seven-year warranty.

Experience has shown that the Frakes stacks, already fitted to some 800 King Airs, reduce soot stains on nacelles and wings by 90 percent and users report a very low cracking rate. But although produced primarily for the King Air line–from the 90 through 300 series–the company also supplies stacks for the Cheyenne and Rocket Malibu, while the new Quest Kodiak has Frakes stacks as standard.

Butterfield Industries has tackled different King Air staining problems caused by dumping hot engine gases and oil from accessory drains. Instead of allowing oil to vent aft of the wheel well to collect on the trailing edge of the flap, Butterfield has designed an air/oil separator system that enables oil to be collected at the base of the nacelle. The residue can then be drained between flights rather than expelled into the atmosphere.

Butterfield’s redesign of the King Air’s engine lip anti-ice system also eliminates sooting on the underside of the nacelles, gear and gear doors. The company has supplied more than 400 kits to King Air operators and is working on Socata TBM and other turboprop singles.   

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