What happened
On January 20, 2006, a Cessna C-56X, registration PP-JGV, was performing a ferry flight from Santos Dumont Airport (SBRJ) to Congonhas Airport (SBSP) in São Paulo. The flight was operated by Interávia Táxi Aéreo Ltda. with two pilots and one passenger on board.
During the climb to FL280, the crew noticed an increase in the Interstage Turbine Temperature (ITT) and fuel flow on the number one engine. Upon reaching cruise altitude, while the ITT returned to normal levels, the fuel flow remained abnormally high. During the descent toward Congonhas, the fuel flow on the left engine increased further, and the engine fire alarm was triggered.
The crew immediately executed emergency checklists, reducing power and shutting down the affected engine. The pilot declared an emergency, and São Paulo Approach granted landing priority. The aircraft successfully performed a single-engine landing at SBSP. While the fire was contained by the crew's actions and did not spread to the airframe, the left engine sustained severe damage.
The investigation
The CENIPA investigation focused on the mechanical failure of the engine. The left engine was inspected by Pratt & Whitney Canada in both Brazil and the United States. Investigators found evidence of molten metal on the external surface of the exhaust duct.
Detailed analysis of the fuel manifold revealed degradation of the silicone rubber thermal protection and leaks through the metallic mesh of the hoses due to internal seal failures. Nitrogen pressure testing confirmed leaks at the mesh and various metallic connections. The investigation also reviewed existing Service Bulletins (SB) issued by the manufacturer regarding fuel tube replacements and inspections.