Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
Corsicana, Texas 75151
Friday, November 17, 1995 8:45 CST
NTSB Narrative Summary Released at Completion of Accident
During descent, after exiting light icing conditions, the left engine lost power, & power fluctuations of the right engine were noted. The flightcrew declared an emergency, diverted to the nearest airport, & made an uneventful landing. There were indications of engine ice ingestion, but no engine damage. During ground runups, the right engine performed normally. The left engine ran normally, except its auto-ignition & overspeed protection were inoperative due to an open fuse in the Digital Electronic Control Unit (DECU). The open fuse would have prevented an automatic relight after a flameout. The Saab 340 fleet has a history of power losses associated with in-flight icing, dating back to 1985. The manufacturer (Saab) had determined that ice/slush could accumulate on the rear wall of the inlet protective device (bird catcher) & shed from the 'splitter lip' into the engine airflow path. As a preventive measure, Saab had developed an auto-ignition system to provide automatic relighting of the engine. Also, Saab was testing an improved heating system to prevent ice/slush from accumulating on the splitter lip. Title 14 CFR Part 25 requires that airplanes be designed so that engine inlet ice that would adversely affect engine operation cannot accumulate. During flight tests with the left engine inoperative & the propeller synchrophaser engaged, multiple power fluctuations of the right engine occurred. Instructions to turn the synchrophaser 'off' were not included in the engine failure checklist.
NTSB Probable Cause Narrative
Total loss of power in the left engine from ice ingestion; and failure of the left-engine auto-relight system caused by an open fuse in the Digital Electronic Control Unit (DECU), which prevented an automatic relight of the left engine. Factors relating to the incident were: inadequate design of the engine air inlet anti-ice system, which allowed ice/slush accumulation; inadequate action by the FAA to ensure compliance with certification requirements regarding inlet ice accumulation; and an inadequate procedure in the flight manual concerning use of the engine synchrophaser during single-engine operation.
Event Information
| Type of Event | Incident |
| Event Date | 11/17/1995 |
| Event Day of the Week | Friday |
| Time of Event | 845 |
| Event Time Zone | Central Standard Time |
| Event City | CORSICANA |
| Event State | TEXAS |
| Event Country | -- |
| Zipcode of the event site | 75151 |
| Event Date Year | 1995 |
| Event Date Month | 11 |
| 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 | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | Full |
| Investigator's weather source | Pilot |
| Time of the weather observation | 0 |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | |
| Elevation of weather observation facility | 0 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | |
| Lighting Conditions | Day |
| Lowest Ceiling Height | 15000 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Overcast |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 50 |
| Air Temperature at event time (in degrees celsius) | 10 |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | 180 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 7 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | -- |
| Density Altitude (feet) | -- |
| 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 | 33 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5025 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Nov 17 1995 12:00AM |
| NTSB Notification Time | 1200 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 7 2000 4:42PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N344SB |
| NTSB Number | FTW96IA045 |
| 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 | 340B-344 |
| Certified Max Gross Weight | 29000 |
| 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 | Nov 6 1995 12:00AM |
| Airframe hours since last inspection | 69 |
| Airframe Hours | 4543 |
| ELT Installed | Yes |
| ELT Activated | No |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | AMR LEASING CORP. |
| Aircraft Owner Street Address | P.O. BOX 619616 |
| Aircraft Owner City | DFW AIRPORT |
| Aircraft Owner State | TX |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 75261 |
| Operator is an individual? | -- |
| Operator Name | SIMMONS AIRLINES |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 1700 W. 20TH ST. |
| Operator City | DFW AIRPORT |
| Operator State | TX |
| Operator Country | |
| Operator Zip code | 75261 |
| Operator Code | SIMA |
| 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 Only |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | CRP |
| Departure City | CORPUS CHRISTI |
| Departure State | TX |
| Departure Country | |
| Departure Time | 720 |
| Departure Time Zone | CST |
| Destination Same as Local Flt | -- |
| Destination Airport Code | CRS |
| Destination City | DALLAS/FT WORTH |
| Destination State | TX |
| Destination Country | |
| Specific Phase of Flight | Descent |
| 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 | -- |