Airworthiness Directive · Amendment 39-9956 · General Electric Aircraft Engines CT7 Series Turboprop Engines
General Electric Aircraft Engines CT7 Series Turboprop Engines
Superseded. A later AD replaced this one: AD 97-25-07. Comply with the one in force.
General Electric Aircraft Engines (GE) Models CT7-5A2, -7A, -9B, -9C turboprop engines, installed on but not limited to Construcciones Aeronauticas, SA (CASA) CN-235 series and SAAB-SCANIA SF340 series aircraft.
This amendment adopts a new airworthiness directive (AD) that is applicable to General Electric Aircraft Engines (GE) CT7 series turboprop engines. This action requires eddy current inspection of disk holes of stage 1 and 2 gas generator turbine (GGT) disks for cracks, and, if necessary, replacement with serviceable parts. This amendment is prompted by a report of a stage 2 GGT disk failure. The actions specified in this AD are intended to prevent a stage 1 or 2 GGT disk failure, which could result in an uncontained engine failure and damage to the aircraft.
