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Last updated: 21 February 2019
Date:Tuesday 5 April 1960
Type:Silhouette image of generic C46 model; specific model in this crash may look slightly different
Curtiss C-46A-40-CU Commando
Operator:Líneas Aéreas de Nicaragua - LANICA
Registration: AN-AIN
C/n / msn: 26945
First flight: 1944
Total airframe hrs:5650
Engines: 2 Pratt & Whitney R-2800-51
Crew:Fatalities: 1 / Occupants: 4
Passengers:Fatalities: 1 / Occupants: 14
Total:Fatalities: 2 / Occupants: 18
Aircraft damage: Damaged beyond repair
Location:2,4 km (1.5 mls) from Siuna Airport (SIU) (   Nicaragua)
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:Siuna Airport (SIU/MNSI), Nicaragua
Destination airport:Bonanza-San Pedro Airport (BZA/MNBZ), Nicaragua
The aircraft crashed on a hillside with a 10 degree upslope, 1,5 miles from the Siuna departure runway.

Probable Cause:

PROBABLE CAUSE: "During the investigation, when the port propeller was being dismantled it was discovered that the distributor valve was broken from the base of the junction with the engine crankshaft, the first threads having broken. The break appeared to be due to fatigue. From the evidence, the rupture of the distributor valve of the port propeller appears to have been the main cause of the accident, additional factors being unfavourable terrain, wind and altitude conditions."

» Diário de Lisboa 6 April 1960, p7


photo of Curtiss C-46A-40-CU Commando AN-AIN
photo of Curtiss C-46A-40-CU Commando AN-AIN
photo of Curtiss C-46A-40-CU Commando AN-AIN
photo of Curtiss C-46A-40-CU Commando AN-AIN
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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Siuna Airport to Bonanza-San Pedro Airport as the crow flies is 38 km (24 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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