# NTSB NYC97LA009: McDonnell Douglas MD-80, N244AA, Jamaica, NY, October 29, 1996 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: October 28, 1996, 22:31 local (Oct 29, 1996, 03:31 UTC) - Place: Jamaica, NY - Coordinates: 40.650756, -73.790481 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.6508&lon=-73.7905&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 2 minor, 90 uninjured - Status: Completed, report September 12, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 39298 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC97LA009 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/39298/pdf - Page: https://openairdocs.org/ntsb/NYC97LA009 ## Probable cause Failure of the nose landing gear upper lock link. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Wheels up landing, landing - landing gear,nose gear assembly - failure (cause) ## Analysis The flight was inbound to land, when the flight crew observed an unsafe nose gear indication. The crew was unable to confirm that the gear was down, and diverted to Runway 31R at JFK. The airplane landed on the runway, with the nose gear retracted, and an emergency evacuation was performed. Examination of the wreckage revealed the nose landing gear upper lock link was fractured into two pieces. The linkage jammed against the shock strut structure, preventing extension of the strut. According to the airplane manufacturer, the nose landing gear upper lock link failed due to fatigue. It was made from aluminum plating. Originally, all the links were made from forged aluminum. Then, the company used plated aluminum because it weighed less. Although both types of lock links were of the same strength, the aluminum plating fatigued sooner than the forged links. After the accident, the company replaced all aluminum plated upper lock links with forged ones. ## Factual narrative On October 28, 1996, about 2231 Eastern Standard Time, American Airlines flight 346, a McDonnell Douglas MD-80, N244AA, sustained minor damage while landing with the nose gear retracted at John F. Kennedy International Airport (JFK), Jamaica, New York. Visual meteorological conditions prevailed for the flight that departed Chicago O'Hare International Airport, Chicago, Illinois; destined for LaGuardia Airport (LGA), Flushing, New York. There were 93 occupants on board; 1 passenger received serious injuries, and 2 passengers received minor injuries. An instrument flight rules flight plan was filed for the air carrier flight conducted under 14 CFR Part 121. The flight was inbound to Runway 31 at LGA when the flight crew observed an unsafe nose gear indication. A low approach was made at LGA for ground personnel to visually determine the nose gear position. They could not confirm the nose gear was down and locked. The flight crew decided to divert to JFK, where a landing was made on Runway 31R, and a subsequent emergency evacuation was performed. Examination of the wreckage revealed that the nose landing gear upper lock link (P/N 3914464-503) was fractured into two pieces. The linkage jammed against the shock strut structure, preventing extension of the strut. According to an analysis by McDonnell Douglas, the upper lock link failed because it was made from a substitute material (aluminum plate) in place of aluminum forging. The aluminum plate had a lower allowable fatigue in comparison to aluminum forging. A representative from McDonnell Douglas stated that the original aluminum forging was replaced by aluminum plating because of lighter weight. After the accident, the company replaced all aluminum plated links with aluminum forging. American Airlines conducted a fleet wide inspection, and found one other cracked lock link. ## Aircraft - Registration: [N244AA](https://openairdocs.org/deregistered/N244AA-2010-06-14), registration cancelled 2010-06-14, S/N 49256, built 1984 (OpenAirDocs) - Reported make and model: McDonnell Douglas MD-80 - Registry model: [Mcdonnell Douglas DC-9-82(MD-82)](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82-md-82) (registry code 3022082) (OpenAirDocs) - Category: Airplane - Serial number: 49256 - Engines: P&W JT8D 20000 lbs thrust turbo fan - Damage: Minor damage - Flight: Part 121 - Operator: American Airlines, Inc - Registered owner: Fleet National Bank - Airworthiness certificate: Standard, Transport - Departed: ORD, CHICAGO, IL - Destination: LGA, FLUSHING, NY - Flight plan: IFR - Airport: JFK, John F. Kennedy Intl Apt, runway 31R, 10,000 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 4,895 total, 3,816 in this make and model, 2,502 as pilot in command, 132 in the last 90 days, 54 in the last 30 days ## Weather - Conditions: Visual (VMC), Night/dark - Wind: 320° at 19 knots, gusting 30 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 50 °F - Altimeter: 29.00 inHg - Observed at: JFK ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19961028045729A](https://openairdocs.org/incident/19961028045729A), Oct 28, 1996: Doug MD88, New York, NY, Minor damage. Nose gear failed extend at lga. Diverted jrk. Landed nose gear up. Passengers injured during evacuation. ## Other investigations on N244AA (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 CHI89FA183](https://openairdocs.org/ntsb/CHI89FA183), Sep 12, 1989: McDonnell Douglas MD-80 (N244AA), Chicago, IL, substantial damage. Probable cause: A LOSS OF HYDRAULIC SYSTEM PRESSURE DUE TO THE OPERATOR'S FAILURE TO REPLACE A SYSTEM COMPONENT THAT HAD A KNOWN HISTORY OF FAILURES, AND THE PILOT'S IMPROPER USE POWERPLANT CONTROLS RESULTING IN A… 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.