Washington DC -- The US-based Federal Aviation Administration (FAA) will adopt a new airworthiness directive (AD) for certain Boeing model 767-200 and 767-300 series aeroplanes as of 28 Feb 2008, in order to prevent potential airplane fires caused by PU foam insulation.
The AD comes as a results of a report from Boeing stating that the PU foam insulation wrapped around duct assemblies in the environmental control system (ECS) could potentially cause a fire as a result of the flame retardants in the material deteriorating with age.
The ducts each cost around $100 and there are 50 of them on each plane. Including labour, the FAA estimates the cost of replacing the ducts could total $32 955 per plane and over $3 million per fleet.
The directive proposes that certain duct assemblies in the ECS are reworked, in order to prevent any fires from happening.
"We are issuing this AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam insulation on the duct assemblies of the ECS, which could propagate a small fire and lead to a larger fire that might spread throughout the aeroplane through the ECS," said the commission, in a 24 Jan statement. (ss)