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NTSB issues safety recommendations on engine fan cowl separation prevention
11 October 2008

The National Transportation Safety Board has recently investigated several events in which engine fan cowls have separated during flight, causing damage to the airplanes involved. The Safety Board is concerned that the procedures for checking that engine fan cowls are latched properly are inadequate. The U.S. NTSB therefor recommends that the FAA:
Require all operators of Airbus single-aisle and Bombardier CL-600 airplane models to revise existing aircraft maintenance manual procedures and maintenance inspection
documents to require a dual inspection signoff to confirm that engine fan cowls are latched after completing any engine maintenance that involves the opening of an engine
fan cowl. (A-08-79)

Require all operators of Airbus single-aisle and Bombardier CL-600 airplane models to require maintenance personnel to inform flight crews when engine fan cowls have been opened before flight. (A-08-80)

Require all operators of Airbus single-aisle and Bombardier CL-600 airplane models to provide guidance to maintenance personnel and flight crews on how to inspect engine fan
cowls to verify that they are latched properly. (A-08-81)

Determine the extent of the problem of engine fan cowl separations on all airplanes and, should a widespread problem exist for any airplanes, require operators of those
airplanes to include a dual inspection signoff in their maintenance procedures to confirm that engine fan cowls are latched after completing any engine maintenance that
involves the opening of an engine fan cowl. (A-08-82) (NTSB)