Individually Owned: 150,657
Corporate Owned: 137,281
Aircraft Accident/Incident Report
St. Louis, Missouri 63044
Thursday, April 30, 1998 10:40 CDT
NTSB Narrative Summary Released at Completion of Accident
The flight experienced a flight control malfunction after takeoff. The flight declared an emergency and returned to the airport safely with no damage to the aircraft or injuries to the crew or passengers. The Captain stated: 'After takeoff the aircraft began to yaw and roll in a cyclic fashion left and right. I switched the yaw damper off and on to ensure that the yaw damper was on. Yaw and roll continued and appeared to increase in its yaw amplitude as the airspeed increased... I declared an 'Emergency' and requested an immediate return for a landing with the emergency equipment standing by... The landing was made in a normal fashion without damage to the aircraft or injury to anyone on board. Total air time was 6 minutes.' The Stability Augmentation Computer, Part 2587826-3, S/N 0270890 was inspected at the TWA Maintenance Facility. The inspection determined that the yaw rate gyro of the Stab Aug Computer had been installed in a reverse position that was 180 degrees opposite from the correct position.
NTSB Probable Cause Narrative
the yaw rate gyro of the Stab Aug Computer had been installed in a reverse position that was 180 degrees opposite from the correct position.
Event Information
| Type of Event | Incident |
| Event Date | 4/30/1998 |
| Event Day of the Week | Thursday |
| Time of Event | 1040 |
| Event Time Zone | Central Daylight Time |
| Event City | ST. LOUIS |
| Event State | MISSOURI |
| Event Country | -- |
| Zipcode of the event site | 63044 |
| Event Date Year | 1998 |
| Event Date Month | 4 |
| 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 | Unknown |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | -- |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Unknown |
| 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 | Not Reported |
| Lowest Ceiling Height | 0 |
| Lowest Non-Ceiling Height | 0 |
| Sky/Lowest/Cloud Conditions | Unknown |
| Sky Condition for Lowest Ceiling | Unknown |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 0 |
| Air Temperature at event time (in degrees celsius) | -- |
| Dew Point at event time (in degress fahrenheit) | -- |
| Wind Direction (degrees magnetic) | 0 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 0 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| 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 | 44 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5030 |
| NTSB Notification Source | -- |
| NTSB Notification Date | May 5 1998 12:00AM |
| NTSB Notification Time | 1000 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 11 2000 11:05AM |
| User who most recently changed record | dbo |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N928L |
| NTSB Number | CHI98IA169 |
| 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 | Unknown |
| Aircraft Explosion | Unknown |
| Aircraft Manufacturer's Full Name | Douglas |
| Aircraft Model | DC-9-34 |
| Aircraft Series Identifier | DC-9-34 |
| Aircraft Serial Number | 48124 |
| Certified Max Gross Weight | -- |
| 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 | -- |
| Number of Engines | -- |
| Fixed gear or retractable gear | Fixed |
| Aircraft, Type of Last Inspection | Unknown |
| 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 | |
| Aircraft Owner Street Address | |
| Aircraft Owner City | |
| Aircraft Owner State | |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | |
| Operator is an individual? | -- |
| Operator Name | TRANS WORLD AIRLINES |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 11495 NATURAL BRIDGE ROAD |
| Operator City | SAINT LOUIS |
| Operator State | MO |
| Operator Country | |
| Operator Zip code | 63044 |
| Operator Code | TWAA |
| 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 | Unknown |
| Departure Point Same as Event | Yes |
| Departure Airport Code | STL |
| Departure City | |
| Departure State | |
| Departure Country | |
| Departure Time | 0 |
| Departure Time Zone | |
| Destination Same as Local Flt | -- |
| Destination Airport Code | YYZ |
| Destination City | TORONTO |
| Destination State | CN |
| Destination Country | |
| Specific Phase of Flight | Takeoff |
| Report sent to ICAO? | -- |
| Evacuation occurred | -- |
| Date of most recent change to record | Dec 11 2000 11:05AM |
| 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 | -- |