What happened
On 3 October 2012, a Cessna C-208B, registration PP-ITZ, was performing a cargo and passenger flight from Coari to Tefé, Brazil. Approximately 20 minutes after departure, the crew noticed the engine oil pressure began to oscillate. Despite the manufacturer's recommendation to land as soon as possible during such an event, the crew decided to continue to the destination. During the final approach to runway 3/33, the propeller feathered unexpectedly, resulting in a total loss of engine power.
The pilot performed an emergency landing, touching down 1,060 meters past the runway threshold. The aircraft approached at a speed exceeding 110 knots without the use of flaps, which significantly increased the required stopping distance. The aircraft could not stop within the remaining runway length and was forced to perform a 180-degree turn on the ground to remain within the runway limits. During the landing roll, the main landing gear brake assembly sustained substantial damage, and an incipient fire broke out in the wheels, which the crew extinguished using an onboard fire extinguisher. All 12 occupants (two pilots and 10 passengers) escaped uninjured through the front doors, as the rear exits were blocked by cargo.
The investigation
CENIPA investigators examined the aircraft and found evidence of a significant oil leak originating from the front of the engine. Upon inspection, it was discovered that the engine had lost nearly all its oil. A subsequent engine start-up confirmed a leak at the engine oil pump seal. Further technical analysis revealed a fracture in the splined coupling of the oil pump axle, which is connected to the standby alternator via a belt.
The investigation also reviewed maintenance records and interviewed company personnel. It was noted that a recent Phase-1 inspection, performed only 14 flight hours prior to the accident, had included tasks related to the standby alternator. Investigators also found that the company's technical manager had delegated oversight responsibilities to the maintenance inspector, effectively removing a critical layer of supervisory protection.