# NTSB CHI97IA134: Lockheed L-1011-385-1, N11003, Saint Louis, MO, May 15, 1997 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: May 15, 1997, 10:25 local (15:25 UTC) - Place: Saint Louis, MO - Coordinates: 38.630065, -90.190048 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.6301&lon=-90.1900&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 187 uninjured - Status: Completed, report May 29, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 10465 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI97IA134 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10465/pdf - Page: https://openairdocs.org/ntsb/CHI97IA134 ## Probable cause failure of company maintenance personnel to properly install a mounting eyebolt (and associated cotter pin, washer, spacer and castellated nut) on the lower forward bracket of the left main landing gear strut door. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, climb - to cruise - miscellaneous,bolt/nut/fastener/clamp/spring - missing (cause) - maintenance,installation - improper, company maintenance personnel (cause) - door,landing gear - separation ## Analysis About 28 minutes after takeoff, while climbing through FL290, the flight crew heard a loud bang of short duration. A check of the airplane was performed with no abnormalities discovered, except for a slight vibration near the left wing area. Postflight examination of the airplane revealed the left main landing gear strut door had separated from the airplane. Also under-wing damage was noted in that area. There was evidence that initial failure of the door mounting points occurred when the crew heard the loud noise, but final separation of the door occurred during final approach for landing. The door landed in downtown Saint Louis. During examination of the door's lower forward mounting bracket, rounded threads were found on the mounting eyebolt, and associated hardware was missing. The missing hardware consisted of a spacer, washer, castellated nut and cotter pin. All other mounting points had signs of overload fractures. Maintenance was last performed in this area on 5/7/97. ## Factual narrative On May 15, 1997, at 1025 central daylight time (cdt), a Lockheed L-1011-385, N11003, operated and registered to Trans World Airlines, Inc., as revenue flight 327, experienced an in-flight separation of the left main landing gear strut door, while on approach to the Lambert Saint Louis International Airport, Saint Louis, Missouri. There were no injuries to the 11 crewmembers or the 176 passengers aboard the airplane. The aircraft was operating as a scheduled domestic passenger flight under the provisions of title 14 CFR Part 121. Visual meteorological conditions existed at the time, and an instrument flight plan was on file for the flight. The flight departed Orlando, Florida, at 0801 cdt, with a destination of Saint Louis, Missouri. According to the flight crew's written statements, at approximately 28 minutes after take off while passing flight level 28.5 for flight level 290, they heard a loud bang of short duration. All systems and flight controls were checked with a visual examination of the wings, and engines number one and three were checked and found to be normal. The Captain maintained .80 mach and flight level 290 for the en route portion of the flight. The Flight Engineer felt a slight vibration around seat rows 24 and 25 located on the left aisle area near the left wing. No other abnormalities were felt. The Captain used conservative speeds for landing configuration and an uneventful landing was made. The Flight Engineer discovered the missing left main landing gear strut door and under wing damage during his post flight inspection. The left main landing gear strut door was discovered approximately five miles away on an extended centerline to runway 30L to Lambert Saint Louis International Airport. The landing gear door landed in downtown Saint Louis at the corner of Tucker Boulevard and Market Street. The NTSB on-scene investigation began at 0900 on May 16, 1997 at the TWA maintenance facility located at Lambert Saint Louis International Airport. Examination of the lower forward mounting bracket revealed the mounting eyebolt had rounded threads and its associated hardware was misisng. The missing hardware consisted of a spacer, washer, castellated nut and cotter pin. All other mounting points revealed signs of overload fractures. The last maintenance performed in this area was on May 7, 1997. ## Aircraft - Registration: [N11003](https://openairdocs.org/deregistered/N11003-2013-08-20), registration cancelled 2013-08-20, S/N 193B-1015, built 1972 (OpenAirDocs) - Reported make and model: Lockheed L-1011-385-1 (L-1011-385) - Registry model: [Lockheed L-1011-385-1](https://openairdocs.org/model/lockheed-l-1011-385-1) (registry code 5265010) (OpenAirDocs) - Registry engine: [Rolls-Royce RB-211-22 series](https://openairdocs.org/engine/rolls-royce-rb-211-22-series) (registry code 54554, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 193B-1015 - Airframe hours: 554 - Engines: Rolls-Royce RB211-22B 42000 lbs thrust turbo fan - Damage: Minor damage - Flight: Part 121 - Registered owner: Trans World Airlines - Airworthiness certificate: Standard, Transport - Last inspection: Continuous airworthiness, February 28, 1997 - Departed: MCO, ORLANDO, FL - Destination: STL - Flight plan: IFR - Airport: STL, Lambert St Louis Intl, runway 30L, 11,019 × 200 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 15,163 total, 4,045 in this make and model, 5,690 as pilot in command, 200 in the last 90 days, 63 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 320° at 19 knots, gusting 24 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °F, dew point 30 °F - Altimeter: 30.00 inHg - Observed at: STL ## Other investigations on N11003 (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB LAX73IL029](https://openairdocs.org/ntsb/LAX73IL029), Jan 10, 1973: Lockheed 1011 (N11003), Grand Junctn, CO, incident, minor damage From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.