Service Bulletin 237 (AD Issuance Pending)
UPPER WING SKIN AND STRAP - INSPECTION FOR CORROSION
Summary & Portfolio
Service Bulletin 237
EFFECTIVITY: Twin Commander Aircraft Corporation (Twin Commander)
MODELS | SERIAL NUMBERS |
690 | ALL |
690A | ALL (except S/N 11195 & 11279) |
690B | ALL (except S/N 11361, 11383, 11527 & 11536) |
REASON FOR PUBLICATION:
It has been found that corrosion can occur between the mating surfaces of the upper wing skin 170141-1 / -501 surface and engine mount beam support straps 170196-1 & 170197-1 LH WING and 170196-2 & 170197-2 RH WING. Theses straps carry engine loads from the support beams into the upper skin and wing internal support structure.
THE SLIDE SHOW PRESENTED ABOVE IS A COMPILATION OF THREE PROJECTS. THEY WERE PERFORMED BY RUBEN CORREA ON BEHALF OF TUSCALOOSA TURBINE AIRCRAFT. THE OWNERS WERE GREATLY SATISFIED AND MAY BE CONTACTED FOR REFERENCES AND DETAILS.