AD 2005-19-18 70 FR 55242 Active

The FAA is superseding an existing airworthiness directive (AD), which applies to all Short Brothers Model SD3-30 and SD3-60 airplanes equipped with certain fire extinguishers. That AD currently requires replacement of the covers for fire extinguisher adapter assemblies that are installed on certain bulkheads with new covers that swivel to lock the extinguishers in place; and replacement of nozzles and triggers on these fire extinguishers with better fitting nozzles and stronger triggers. The existing AD also currently requires the installation of new fire extinguisher point placards and a revision of the airplane flight manual (AFM) to instruct the flightcrew in the use of the new covers for these adapter assemblies. This new AD also requires modification of the fire extinguishing point adapter assembly of the forward and aft baggage bays as applicable. This new AD also adds airplanes to the applicability. For these new airplanes, this new AD requires a revision to the AFM for instructions on using the new fire extinguisher adapter. This AD results from reports of individuals experiencing fire extinguishant blowback when the extinguishant discharges through the fire extinguishing point adapters. We are issuing this AD to prevent fire extinguishant blowback, which could result in injury to a person using the fire extinguisher in the event of a fire.