Individually Owned: 150,657
Corporate Owned: 137,281
Lambert-St. Louis Int'l Airport
Aircraft Accident/Incident Report
St. Louis, Missouri 63145
Thursday, September 2, 1993 12:03 CDT
NTSB Narrative Summary Released at Completion of Accident
AS THE CAPTAIN WAS TURNING THE AIRPLANE OFF THE RUNWAY FOLLOWING ITS LANDING ROLL HE SAID IT WAS '...EXTREMELY DIFFICULT TO TURN.' THE CAPTAIN SAID THE AIRPLANE TURNED TO A 45 DEGREE ANGLE TO THE RUNWAY AND WOULD GO NO FURTHER. THE STEERING SYSTEM FAILED AND THE CAPTAIN ATTEMPTED TO STOP THE AIRPLANE ON THE TAXIWAY USING BRAKES AND REVERSE THRUST. THE AIRPLANE WOULD NOT STOP AND ROLLED OFF ONTO THE GRASS AREA ADJACENT TO THE TAXIWAY. EXAMINATION OF THE BRAKE SYSTEM FOUND THE HYDRAULIC SYSTEM POWER TRANSFER UNIT'S (PTU) HOUSING WAS CRACKED AROUND ITS ENTIRE CIRCUMFERENCE. THE PTU ON THE INCIDENT AIRPLANE WAS AN EARLY STYLE UNIT ACCORDING TO THE MANUFACTURER'S SERVICE BULLETIN. THE SERVICE BULLETIN ADVISED OWNERS OF THE AIRPLANE TO REPLACE THE ORIGINAL ALUMINUM HOUSING WITH A CAST IRON TYPE. EXAMINATION OF THE PTU'S HOUSING FRACTURE SURFACES REVEALED SHRINKAGE CAVITIES, AND LARGE SILICON INCLUSIONS.
NTSB Probable Cause Narrative
a fatigue failure of the power transfer unit caused by a material defect which resulted in a total hydraulic system failure.
Event Information
| Type of Event | Incident |
| Event Date | 9/2/1993 |
| Event Day of the Week | Thursday |
| Time of Event | 1203 |
| Event Time Zone | Central Daylight Time |
| Event City | ST. LOUIS |
| Event State | MISSOURI |
| Event Country | -- |
| Zipcode of the event site | 63145 |
| Event Date Year | 1993 |
| Event Date Month | 9 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | |
| Event Location Longitude | |
| Event Location Airport | LAMBERT-ST. LOUIS INT'L |
| Event Location Nearest Airport ID | STL |
| Indicates whether the acc/inc occurred off or on an airport | On Airport |
| Distance from airport in statute miles | -- |
| Degrees magnetic from airport | -- |
| Airport Elevation | 605 |
| Weather Briefing Completeness | Unknown |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1251 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | 0 |
| Weather Observation Facility ID | STL |
| Elevation of weather observation facility | 605 |
| Distance of event from weather observation facility (units?) | 0 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Not Reported |
| Lowest Ceiling Height | 4000 |
| Lowest Non-Ceiling Height | 3300 |
| 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) | 8 |
| Air Temperature at event time (in degrees celsius) | 29 |
| Dew Point at event time (in degress fahrenheit) | 22 |
| Wind Direction (degrees magnetic) | 210 |
| Variable Wind Indicator | Unknown |
| Wind Speed (knots) | 6 |
| Wind Velocity Indicator | Unknown |
| Wind Gust Indicator | Unknown |
| Wind Gust (knots) | 0 |
| Altimeter Setting at event time (in. Hg) | 29 |
| 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 | 108 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 5047 |
| NTSB Notification Source | -- |
| NTSB Notification Date | Sep 2 1993 12:00AM |
| NTSB Notification Time | 1730 |
| Fiche Number and/or location -used to find docket information | IMAGE |
| Date of most recent change to record | Dec 2 2002 9:04AM |
| User who most recently changed record | NTSB\ZUZL |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N918TW |
| NTSB Number | CHI93IA352 |
| 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 | MCDONNELL DOUGLAS |
| Aircraft Model | DC-9-82 |
| Aircraft Series Identifier | DC-9-82 |
| Aircraft Serial Number | 49367 |
| Certified Max Gross Weight | 140000 |
| 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 | 132 |
| 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 | No |
| ELT Activated | Unknown |
| ELT Aided Location of Event Site | Unknown |
| ELT Type | -- |
| Aircraft Owner Name | TWA, INC. |
| Aircraft Owner Street Address | 100 S. BEDFORD ROAD |
| Aircraft Owner City | MT. KISCO |
| Aircraft Owner State | NY |
| Aircraft Owner Country | |
| Aircraft Owner Zipcode | 10549 |
| Operator is an individual? | -- |
| Operator Name | TWA, INC. |
| Operator Same as Owner? | No |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | No |
| Operator Street Address | 100 S. BEDFORD ROAD |
| Operator City | MT. KISCO |
| Operator State | NY |
| Operator Country | |
| Operator Zip code | 10549 |
| 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/Cargo |
| Type of Flying (Per_Bus / Primary) | Unknown |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | LGA |
| Departure City | NEW YORK |
| Departure State | NY |
| Departure Country | |
| Departure Time | 1029 |
| Departure Time Zone | EDT |
| Destination Same as Local Flt | crash at destination city |
| Destination Airport Code | STL |
| Destination City | |
| Destination State | MO |
| 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 | 30R |
| Runway Length | 11019 |
| Runway Width | 200 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |