US Airways continues to evaluate a single Boeing 767 in its fleet that has been removed from service three times over the past four months to fix issues related to odours in the cabin.
The latest incident occurred on 16 March when the aircraft returned to the gate in Charlotte, North Carolina shortly after pushback. In that instance, an electrical smell was detected in the cabin.
In the company's latest employee update SVP Technical Operations David Seymour says after removing the aircraft from service US Airways determined "the pressurisation door seals on the right rear service door were open, which is normal since the aircraft was still unpressurised. This allowed engine exhaust to be blown into the aircraft due to a gusty tailwind on pushback".
US Airways says after further testing, the pressurisation door seals functioned correctly when the aircraft was pressurised. "We are performing additional maintenance evaluations and trouble shooting."
Previous incidents with cabin odours on the aircraft were linked to engine oil circulating in the aircraft's bleed air system.