# NTSB NYC02LA036: Rockwell NA-265-80, N819GY, Boston, MA, December 10, 2001 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: December 9, 2001, 20:20 local (Dec 10, 2001, 01:20 UTC) - Place: Boston, MA - Coordinates: 42.364166, -71.004997 - Nearby events: https://openairdocs.org/map.md?lat=42.3642&lon=-71.0050&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed, report June 25, 2003 - Report: Approved by Office Director - NTSB case key (mKey): 53904 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC02LA036 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/53904/pdf - Page: https://openairdocs.org/ntsb/NYC02LA036 ## Probable cause The failure of the left thrust reverser assembly due to fatigue. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, landing - roll - thrust reverser - fatigue (cause) ## Analysis After touchdown, the pilot deployed the thrust reversers and shortly thereafter, the airplane yawed violently to the right. The pilot maintained control, and the airplane came to a stop on the runway. Subsequent examination of the airplane revealed that the left engine thrust reverser assembly had separated from the engine and was found on the runway. Examination of the left thrust reverser outboard pinion gearbox revealed three fatigue bolts, with multiple origins. A fourth bolt was pulled completely out of the flange and was slightly bent. The inboard pinion gearbox was fractured into two parts and contained two regions of fatigue in the rails at the forward flange. The fatigue features were consistent with low stress high-cycle fatigue. The left thrust reverser was installed on May 7, 1996. It was not determined if the left thrust reverser attaching bolts were replaced at that time. At the time of the accident, the left thrust reverser had accumulated 8,275 total landings, and 2,560 landings since it was installed. ## Factual narrative On December 9, 2001, about 2020 eastern standard time, a Rockwell International NA-265-80 Sabreliner, N819GY, operated by Eagle Jet Charter, Inc., was substantially damaged when the left engine thrust reverser assembly separated from the engine, and struck the fuselage during landing at General Edward Lawrence Logan International Airport (BOS), Boston, Massachusetts. The two certificated airline transport pilots and a passenger were not injured. Visual meteorological conditions prevailed and an instrument flight rules flight plan had been filed for the flight that originated from McCarran International Airport (LAS), Las Vegas, Nevada. The non-scheduled passenger flight was conducted under 14 CFR Part 135. The airplane was landing on runway 4L, a 7,861-foot long, 150-foot wide, asphalt runway. In a written statement, the pilot-in-command said: "...After a normal landing the thrust reversers were deployed in the prescribed manner and both deploy lights indicated a normal deployment. About a second after full reverse power was achieved the aircraft yawed violently to the right. I braked left and stowed both thrust reversers. After taxiing off the runway, it was noted that the left thrust reverser unlock light was still illuminated...." Examination of the airplane by a Federal Aviation Administration inspector revealed that the left engine thrust reverser assembly had separated from the engine and was found on the runway. Additionally, the thrust reverser punctured the fuselage aft of the left engine and subsequently cut a rib and stringer. The left thrust reverser was retained for further examination. The left thrust reverser inboard pinion gearbox, the outboard pinion gearbox with broken drive cable housing cover, and upper outboard T-fitting, were forwarded to the Safety Board Materials Laboratory. According to the metallurgist's report, visual examination of the outboard pinion gearbox revealed it was intact; however, three of the four attaching bolts at the forward flange were fractured, with the threaded ends remaining in the flange. Optical examination of the fracture surfaces on the threaded ends revealed that all fractures initiated from multiple origins. The fractures then propagated to the surface toward the interior with arrest marks and flat features indicative of fatigue propagation. The fourth bolt had pulled out of the flange and was contained in the T-fitting. The bolt was intact, slightly bent, and contained the helicoil and apparent remnants of the aluminum threads from the pinion gearbox. The inboard pinion gearbox was fractured into two sections. The fracture was located just aft of the forward flange. Two origin areas were observed at the base of the two rails in the radii near the forward flange. Examination of the fracture surfaces revealed damage indicative of fatigue. The fatigued regions were observed propagating from both the upper and lower surfaces of both rails, consistent with reverse bending loads. All fatigue regions initiated in the radii at the base of the rail with multiple origins. Visual examination of the forward face of the rails revealed signs of heavy impact/wear. Scanning electron microscope examination of the largest fatigue region on the rail revealed damage consistent with low-alternating stress high-cycle fatigue propagation. Review of maintenance records revealed that the left thrust reverser was installed on May 7, 1996. At that time, the airplane had accumulated approximately 6,717 total flight hours, and 5,715 landings. It was not determined if the left thrust reverser attaching bolts were replaced at that time. The airplane was maintained under a continued airworthiness inspection program. The thrust reversers were inspected on June 3, 2001, at 9226.8 flight hours, 8,026 landings. The thrust reversers were last lubricated on September 11, 2001, at 9353.5 flight hours, 8,157 landings. At the time of the accident, the left thrust reverser had accumulated 8,275 total landings, and about 2,560 landings since it was installed. ## Aircraft - Registration: [N819GY](https://openairdocs.org/deregistered/N819GY-2010-08-13), registration cancelled 2010-08-13, S/N 380-66 (OpenAirDocs) - Reported make and model: Rockwell NA-265-80 - Registry model: [Rockwell International NA-265-80](https://openairdocs.org/model/rockwell-international-na-265-80) (registry code 7630108) (OpenAirDocs) - Category: Airplane - Serial number: 380-066 - Airframe hours: 9465 - Engines: General Electric CF-700 4500 lbs thrust turbo fan; General Electric CF-700 4500 lbs thrust turbo fan - Damage: Substantial damage - Flight: Part 135 - Operator: Eagle Jet Charter, Inc. - Registered owner: Lear 25, Inc. - Airworthiness certificate: Standard, Transport - Last inspection: Continuous airworthiness, December 8, 2001, 5 hours before - Departed: SUS, St. Louis, MO - Destination: BOS, Boston, MA - Flight plan: IFR - Airport: BOS, General Edward Lawrence Logan, runway 4L, 7,861 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 46; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; last flight review August 10, 2001; seat: left; flight hours: 7,120 total, 2,130 in this make and model, 6,350 as pilot in command, 75 in the last 90 days, 30 in the last 30 days, 5 in the last 24 hours - Co-pilot; age 60; injuries: none; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; last flight review August 10, 2001; seat: right; flight hours: 20,000 total, 584 in this make and model, 110 in the last 90 days, 41 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Night/dark - Wind: 320° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 36 °F, dew point 28 °F - Altimeter: 30.27 inHg - Observed at: BOS ## 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 20011209032289A](https://openairdocs.org/incident/20011209032289A), Dec 9, 2001: Rkwell NA26580, Boston, MA, No damage. (-23) N819GY, rockwell international sabreliner, NA-265-80, lost the left engine thrust reverser after landing Boston runway 04L at 2019 EST, 12/9/01. The… 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.