Roosevelt Roads Airport
Aircraft Accident/Incident Report

Roosevelt Roads, Puerto Rico 00742
Tuesady, April 12, 2005 10:50 AST

NTSB Narrative Summary Released at Completion of Accident

The airplane experienced a total loss of engine power during a domestic passenger cross-country flight. Following the loss of power, the pilot successfully landed the airplane at a nearby Naval Air Station. The pilot reported that during cruise flight, he heard a loud bang and oil became visible on the aircraft's windshield. He stated that concurrent with the loud bang, the propeller came to an abrupt stop. Postaccident examination of the engine revealed extensive corrosion and mechanical damage throughout the compressor and power turbine assemblies. The compressor disk assembly was essentially intact, however, all of the compressor turbine blades were fractured and displaced. The fracture surfaces were all approximately .250 inches above the corresponding blade platform. Examination of the fractured compressor turbine blades revealed the blades fractured in a tensile overload condition. The overload fractures associated with the compressor turbine blades was due to a weakening of the underlying base material due to the presence of sulphidation corrosion. The sulphidation corrosion was evident through approximately half of the thickness of the blades airfoil reducing the blades effective load bearing capabilities. The material composition of the turbine blades met drawing requirements and no metallurgical anomalies were found.

NTSB Probable Cause Narrative

The fracture of multiple compressor turbine blades while the airplane was in a cruise flight configuration resulting in a loss of engine power. Sulphidation type corrosion was a factor in failure of the blades.

Event Information

Type of Event Incident
Event Date 4/12/2005
Event Day of the Week Tuesday
Time of Event 1050
Event Time Zone Atlantic Standard Time
Event City Roosevelt Roads
Event State PUERTO RICO
Event Country --
Zipcode of the event site 00742
Event Date Year 2005
Event Date Month 4
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude 181442N
Event Location Longitude 0653836W
Event Location Airport Roosevelt Roads Airport
Event Location Nearest Airport ID TJNR
Indicates whether the acc/inc occurred off or on an airport On Airport
Distance from airport in statute miles 0
Degrees magnetic from airport --
Airport Elevation 39
Weather Briefing Completeness --
Investigator's weather source Pilot
Time of the weather observation
Direction of event from weather observation facility (degrees) --
Weather Observation Facility ID --
Elevation of weather observation facility --
Distance of event from weather observation facility (units?) --
Time Zone of the weather observation --
Lighting Conditions Day
Lowest Ceiling Height --
Lowest Non-Ceiling Height 3500
Sky/Lowest/Cloud Conditions Scattered
Sky Condition for Lowest Ceiling None
Visibility Runway Visual Range (Feet) --
Visibility Runway Visual Value (Statute Miles) --
Visibility (Statute Miles) 10
Air Temperature at event time (in degrees celsius) 31
Dew Point at event time (in degress fahrenheit) --
Wind Direction (degrees magnetic) 180
Variable Wind Indicator Wind direction could be determined
Wind Speed (knots) 6
Wind Velocity Indicator --
Wind Gust Indicator Not Gusting
Wind Gust (knots) --
Altimeter Setting at event time (in. Hg) 29.89
Density Altitude (feet) --
Intensity of Precipitation --
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries --
On Ground, Minor Injuries --
On Ground, Serious Injuries --
Injury Total Fatal --
Injury Total Minor --
Injury Total None 4
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 19693
NTSB Notification Source FAA-ROC
NTSB Notification Date Apr 12 2005 12:00AM
NTSB Notification Time 1134
Fiche Number and/or location -used to find docket information DMS
Date of most recent change to record May 30 2006 1:54PM
User who most recently changed record NTSB\JOHB
Basic weather conditions Visual Meteorological Cond
FAA District Office San Juan FSDO

Aircraft Involved

Aircraft #1

Aircraft Registration Number N1241X
NTSB Number SEA05FA074
Missing Aircraft Indicator --
Federal Aviation Reg. Part Part 135: Air Taxi & Commuter
Type of Flight Plan filed VFR
Flight plan Was Activated? No
Damage None
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name Cessna
Aircraft Model 208B
Aircraft Series Identifier --
Aircraft Serial Number 208B-657
Certified Max Gross Weight 8750
Aircraft Category Airplane
Aircraft Registration Class --
Aircraft is a homebuilt? No
Flight Crew Seats --
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 8
Number of Engines 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection Continuous Airworthiness
Date of Last Inspection Apr 1 2005 12:00AM
Airframe hours since last inspection 16
Airframe Hours 3777
ELT Installed Yes
ELT Activated No
ELT Aided Location of Event Site No
ELT Type --
Aircraft Owner Name First Bank Leasing
Aircraft Owner Street Address 560 Anglum Road
Aircraft Owner City Hazelwood
Aircraft Owner State MO
Aircraft Owner Country USA
Aircraft Owner Zipcode 63042
Operator is an individual? No
Operator Name MN Aviation
Operator Same as Owner? No
Operator Is Doing Business As --
Operator Address Same as Owner? No
Operator Street Address PO BOX 9066566
Operator City San Juan
Operator State PR
Operator Country USA
Operator Zip code 00906
Operator Code --
Owner has at least one certificate --
Other Operator of large aircraft? --
Certified for Part 133 or 137 Operation --
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not Non-scheduled
Indicates Domestic or International Flight Domestic
Operator carrying Pax/Cargo/Mail Passenger Only
Type of Flying (Per_Bus / Primary) --
Second Pilot on Board No
Departure Point Same as Event No
Departure Airport Code VQS
Departure City Vieques
Departure State PR
Departure Country USA
Departure Time 1041
Departure Time Zone AST
Destination Same as Local Flt --
Destination Airport Code TJSJ
Destination City San Juan
Destination State PR
Destination Country USA
Specific Phase of Flight Cruise
Report sent to ICAO? No
Evacuation occurred No
Date of most recent change to record Mar 13 2006 12:04PM
User who most recently changed record STAM
Since inspection or accident Time of Accident
Event Location Runway Number and Location 25
Runway Length 11000
Runway Width --
Sight Seeing flight No
Air Medical Flight No
Medical Flight --