Aircraft Accident/Incident Report

Chattanooga, Tennessee 37412
Monday, August 31, 1992 14:50 CDT

NTSB Narrative Summary Released at Completion of Accident

THE FLIGHT WAS CRUISING AT AN ALTITUDE OF 15,000 FEET. THE FLIGHT CREW OBSERVED THE PROPELLER OIL PRESSURE FOR THE LEFT ENGINE RISE ABOVE THE RED LINE, AND SHUT THE ENGINE DOWN. THE FLIGHT WAS OVER CHATTANOOGA, TENNESSEE, AND THE PILOT ELECTED TO LAND AT CHATTANOOGA. THE FLIGHT CREW UNSUCCESSFULLY ATTEMPTED SEVERAL TIMES TO FEATHER THE PROPELLER. THE FLIGHT CREW REPORTED THAT AT SOME POINT, PRIOR TO EXITING THE RUNWAY AFTER LANDING, THE AIRCRAFT PROPELLER HAD STOPPED ROTATING. EXAMINATION OF THE PROPELLER GEAR BOX REVEALED THAT THE GEAR BOX WAS SEIZED AS A RESULT OF A FAILURE WITHIN THE GEAR BOX. EXAMINATION OF THE PROPELLER CONTROL UNIT REVEALED THAT THE UNIT WAS FAILED TO PITCHLOCK AS A RESULT OF CONTAMINATED OIL SUPPLY FROM THE GEAR BOX. VELOCITY MINIMUM CONTROL WITH A NON ROTATING PROPELLER HAS NOT BEEN DETERMINED FOR THIS AIRCRAFT.

NTSB Probable Cause Narrative

THE FAILURE AND SUBSEQUENT SEIZURE OF THE REDUCTION GEAR BOX, AND THE FAILURE OF THE PROPELLER CONTROL UNIT AS A RESULT OF CONTAMINATED OIL SUPPLY WHICH IS SHARED WITH THE GEAR BOX.

Event Information

Type of Event Incident
Event Date 8/31/1992
Event Day of the Week Monday
Time of Event 1450
Event Time Zone Central Daylight Time
Event City CHATTANOOGA
Event State TENNESSEE
Event Country --
Zipcode of the event site 37412
Event Date Year 1992
Event Date Month 8
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude
Event Location Longitude
Event Location Airport
Event Location Nearest Airport ID
Indicates whether the acc/inc occurred off or on an airport Off Airport/Airstrip
Distance from airport in statute miles 0
Degrees magnetic from airport 0
Airport Elevation --
Weather Briefing Completeness Not pertinent
Investigator's weather source Weather Observation Facility
Time of the weather observation 1450 Central Daylight Time
Direction of event from weather observation facility (degrees) 320
Weather Observation Facility ID BNA
Elevation of weather observation facility 599
Distance of event from weather observation facility (units?) 60
Time Zone of the weather observation CDT
Lighting Conditions Day
Lowest Ceiling Height 25000
Lowest Non-Ceiling Height 4000
Sky/Lowest/Cloud Conditions Scattered
Sky Condition for Lowest Ceiling Broken
Visibility Runway Visual Range (Feet) 0
Visibility Runway Visual Value (Statute Miles) 0
Visibility (Statute Miles) 10
Air Temperature at event time (in degrees celsius) 28
Dew Point at event time (in degress fahrenheit) 19
Wind Direction (degrees magnetic) 70
Variable Wind Indicator Unknown
Wind Speed (knots) 4
Wind Velocity Indicator Unknown
Wind Gust Indicator Unknown
Wind Gust (knots) 0
Altimeter Setting at event time (in. Hg) 30
Density Altitude (feet) 2370
Intensity of Precipitation Unknown
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries 0
On Ground, Minor Injuries 0
On Ground, Serious Injuries 0
Injury Total Fatal --
Injury Total Minor --
Injury Total None 25
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 5046
NTSB Notification Source --
NTSB Notification Date Sep 1 1992 12:00AM
NTSB Notification Time 1100
Fiche Number and/or location -used to find docket information 50001
Date of most recent change to record Dec 11 2000 3:11PM
User who most recently changed record dbo
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N245AE
NTSB Number ATL92IA169
Missing Aircraft Indicator N
Federal Aviation Reg. Part Part 121: Air Carrier
Type of Flight Plan filed IFR
Flight plan Was Activated? --
Damage None
Aircraft Fire None
Aircraft Explosion None
Aircraft Manufacturer's Full Name Saab-Scania AB (Saab)
Aircraft Model 340B
Aircraft Series Identifier 340B
Aircraft Serial Number 245
Certified Max Gross Weight 28800
Aircraft Category Airplane
Aircraft Registration Class U.S. Registered/U.S. Soil
Aircraft is a homebuilt? No
Flight Crew Seats --
Cabin Crew Seats --
Passenger Seats --
Total number of seats on the aircraft 37
Number of Engines 2
Fixed gear or retractable gear Retractable
Aircraft, Type of Last Inspection Continuous Airworthiness
Date of Last Inspection Aug 16 1992 12:00AM
Airframe hours since last inspection 88
Airframe Hours 2447
ELT Installed Yes
ELT Activated No
ELT Aided Location of Event Site No
ELT Type --
Aircraft Owner Name FLAGSHIP AIRLINES, INC
Aircraft Owner Street Address PO BOX 619616 MD 4280
Aircraft Owner City DALLAS ARPT
Aircraft Owner State TX
Aircraft Owner Country
Aircraft Owner Zipcode 75261
Operator is an individual? --
Operator Name FLAGSHIP AIRLINES, INC.
Operator Same as Owner? No
Operator Is Doing Business As --
Operator Address Same as Owner? No
Operator Street Address 2 INTERNATIONAL WAY
Operator City NASHVILLE
Operator State TN
Operator Country
Operator Zip code 37221
Operator Code NVEA
Owner has at least one certificate Yes - certificate holder
Other Operator of large aircraft? No
Certified for Part 133 or 137 Operation Unknown
Operator Certificate Number --
Indicates whether an air carrier operation was scheduled or not Scheduled
Indicates Domestic or International Flight Domestic
Operator carrying Pax/Cargo/Mail Passenger/Cargo
Type of Flying (Per_Bus / Primary) Unknown
Second Pilot on Board Yes
Departure Point Same as Event No
Departure Airport Code BNA
Departure City NASHVILLE
Departure State TN
Departure Country
Departure Time 1400
Departure Time Zone CDT
Destination Same as Local Flt --
Destination Airport Code ATL
Destination City ATLANTA
Destination State GA
Destination Country
Specific Phase of Flight Cruise
Report sent to ICAO? --
Evacuation occurred --
Date of most recent change to record Jan 2 2001 10:30AM
User who most recently changed record dbo
Since inspection or accident --
Event Location Runway Number and Location 0
Runway Length --
Runway Width --
Sight Seeing flight No
Air Medical Flight No
Medical Flight --