Individually Owned: 150,657
Corporate Owned: 137,281
Springfield Regional Airport
Aircraft Accident/Incident Report
Springfield, Missouri 65803
Friday, January 23, 1987 7:18 CST
NTSB Narrative Summary Released at Completion of Accident
THE PIC OF THIS AIR MIDWEST FLT 4408 SAID THAT, WHILE ON INITIAL CLIMB, POWER (NP) ON THE LEFT ENGINE DECAYED TO 60% AND WOULD NOT RECOVER. THE ENGINE WAS FEATHERED BY CONDITION LEVER BUT THE TORQUE ROSE TO 140% WHILE RETURNING FOR A LANDING, ACCORDING TO THE PIC. THE AIRCRAFT LANDED SAFELY. A POST-INCIDENT INVESTIGATION DISCLOSED THAT AN OIL LEAK HAD BEEN TRACED, THE DAY PRIOR TO THE INCIDENT, TO A FRACTURED PROPELLER CONTROL UNIT SOLENOID. THAT PART WAS REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE. THE PLASTIC BLADE RETAINING RINGS INSIDE THE PROPELLER ASSY WERE DAMAGED DUE TO THE ENGINE OVERTORQUE AND SUBSEQUENT SHUTDOWN. A TEARDOWN OF THE PROPELLER CONTROL UNIT (PCU) SHOWED THAT THE BETA TUBE HAD NOT FAILED NOR WAS IT FREEWHEELING INSIDE THE PCU. A SPECTROGRAPHIC ANALYSIS OF OIL SAMPLES, DRAWN FROM FOUR SEPARATE SECTIONS OF THE ENGINE, TESTED SATIFACTORILY. AS SUCH, NO REASON COULD BE FOUND FOR THE DROP IN ENGINE POWER (NP) AND SUBSEQUENT OVERTORQUE.
NTSB Probable Cause Narrative
Not Yet Reported
Event Information
| Type of Event | Incident |
| Event Date | 1/23/1987 |
| Event Day of the Week | Friday |
| Time of Event | 718 |
| Event Time Zone | Central Standard Time |
| Event City | SPRINGFIELD |
| Event State | MISSOURI |
| Event Country | -- |
| Zipcode of the event site | 65803 |
| Event Date Year | 1987 |
| Event Date Month | 1 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | SPRINGFIELD REGIONAL |
| Event Location Nearest Airport ID | SGF |
| 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 | 1267 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Unknown |
| Time of the weather observation | 1710 Central Standard Time |
| Direction of event from weather observation facility (degrees) | 240 |
| Weather Observation Facility ID | SGF |
| Elevation of weather observation facility | 1267 |
| Distance of event from weather observation facility (units?) | 8 |
| Time Zone of the weather observation | CST |
| Lighting Conditions | Dawn |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 12000 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | None |
| 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) | 2 |
| Dew Point at event time (in degress fahrenheit) | -7 |
| Wind Direction (degrees magnetic) | 350 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 8 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 30 |
| 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 | 10 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5035 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Jan 23 1987 12:00AM |
| NTSB Notification Time | 1200 |
| Fiche Number and/or location -used to find docket information | 34457 |
| Date of most recent change to record | Dec 13 2000 1:37PM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N120AM |
| NTSB Number | MKC87IA043 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 135: Air Taxi & Commuter |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | -- |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | EMBRAER |
| Aircraft Model | EMB-120 |
| Aircraft Series Identifier | EMB-120 |
| Aircraft Serial Number | 120.012 |
| Certified Max Gross Weight | 25353 |
| 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 | 32 |
| Number of Engines | 2 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | AAIP |
| Date of Last Inspection | -- |
| Airframe hours since last inspection | -- |
| Airframe Hours | -- |
| ELT Installed | Unknown |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | AIR MIDWEST, INC. |
| Aircraft Owner Street Address | P.O. BOX 7724 |
| Aircraft Owner City | WICHITA |
| Aircraft Owner State | KS |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 67277 |
| Operator is an individual? | -- |
| Operator Name | |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | |
| Operator City | |
| Operator State | |
| Operator Country | |
| Operator Zip code | |
| Operator Code | AMWA |
| 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 | Yes |
| Departure Airport Code | SGF |
| Departure City | SPRINGFIELD |
| Departure State | MO |
| Departure Country | |
| Departure Time | 710 |
| Departure Time Zone | CST |
| Destination Same as Local Flt | -- |
| Destination Airport Code | BNA |
| Destination City | NASHVILLE |
| Destination State | TN |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| 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 | 1 |
| Runway Length | 7003 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |