Safety of flight notice–Temperform USA aluminum parts

 - February 8, 2007, 4:46 AM

Information received during an FAA investigation into suspected unapproved parts indicates that Temperform USA, formerly of Mirada, Calif., had improperly heat-treated numerous aluminum parts that have aviation applications. Temperform was approved to perform heat-treating for many production approval holders.
The investigation disclosed that from May 1998 to September 2001, Temperform improperly heat-treated and falsified quality testing on parts that are used in various type-certified aircraft. Regulations require that type-certified products conform to their type design.
Aircraft owners and operators, manufacturers, maintenance organizations and parts suppliers and distributors should inspect their aircraft, aircraft records and/or parts inventories for the referenced part numbers. If any are found in existing stock, the FAA recommends that the parts be quarantined to prevent installation until a determination can be made regarding their eligibility for installation.
The parts in question do not display any readily identifiable external features
or markings to distinguish them from properly heat-treated parts; therefore, documentation associated with the parts should be reviewed to determine the source of heat-treating. Parts heat-treated by Temperform may require hardness and/or conductivity testing.

The FAA has a list containing 4,148 distinct parts that affect a wide range of transport-category, business and general aviation aircraft, including the Boeing 707, 717, 727, 737, 747, 757, 767, 777, DC-8, DC-9, DC-10, MD-11, MD-80 and MD-90; MD Helicopters 369D; Bell/Agusta AB139; Airbus A320/321 and A340; Beech 400; Bell 212, 206, 430; Bombardier Global Express, Challenger 600, Challenger 601, Learjet 45; BAE 146; Saab 340; de Havilland Dash 8; Cessna Citation, Citation 650, Citation 750, Cessna Ultra Encore 560; Dornier 328; Galaxy, G200, Gulfstream GV; and parts for Rolls-Royce, Pratt & Whitney and GE aero engines. The full listing is available at

Further information concerning this investigation and guidance regarding the referenced parts can be obtained from the FAA Manufacturing Inspection District Office in Lakewood, Calif. The FAA would appreciate any information concerning the discovery of these parts, the means used to identify the source and the action taken to remove any part from service.