# NTSB CEN25LA402: Textron 525C, N361MB, Baton Rouge, LA, September 25, 2025 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: September 25, 2025, 18:25 local (23:25 UTC) - Place: Baton Rouge, LA - Coordinates: 30.532917, -91.149889 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=30.5329&lon=-91.1499&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report December 11, 2025 - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Central Region - Parties: Federal Aviation Administration, Baton Rouge FSDO - NTSB case key (mKey): 201748 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN25LA402 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/201748/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=201748 - Page: https://openairdocs.org/ntsb/CEN25LA402 ## Probable cause The improper installation of the trunnion pin, which resulted in a failure of the right main landing gear. Contributing to the accident was the failure of maintenance personnel to follow the aircraft manufacturer’s maintenance procedures. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Maintenance: installation](https://openairdocs.org/ntsb-findings/02062035): Personnel issues › Task performance · Maintenance personnel (probable cause); cases with it: [Textron 525C, 1 case](https://openairdocs.org/ntsb-findings/02062035/cases.md?model=2076628), [All aircraft, 371 cases](https://openairdocs.org/ntsb-findings/02062035/cases.md) - [Landing gear system: main gear strut/axle/truck](https://openairdocs.org/ntsb-findings/01023213): Aircraft › Aircraft systems · Incorrect service/maintenance (probable cause); cases with it: [Textron 525C, 1 case](https://openairdocs.org/ntsb-findings/01023213/cases.md?model=2076628), [All aircraft, 86 cases](https://openairdocs.org/ntsb-findings/01023213/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Prior to flight: Aircraft maintenance event](https://openairdocs.org/ntsb-events/040); cases with it: [Textron 525C, 1 case](https://openairdocs.org/ntsb-events/040/sequence.md?model=2076628), [All aircraft, 484 cases](https://openairdocs.org/ntsb-events/040/sequence.md) - [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Textron 525C, 1 case](https://openairdocs.org/ntsb-events/094/sequence.md?model=2076628), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis About 10,000 ft mean sea level during a repositioning flight, the flight crew felt a bump/thud in the back of the airplane, which they thought was caused by something falling into the aisle from the lavatory. The flight crew observed that the landing gear unsafe light was illuminated. The flight crew stated that they followed emergency/abnormal airplane checklist items and reset the landing circuit breaker, which did not retract the landing gear. Then, the crew lowered the landing gear, which resulted in three green landing gear position lights. They continued the flight to the destination with the landing gear extended where they landed the airplane. During landing rollout and after applying moderate braking, they felt the right main landing gear collapse, which then punctured the right wing and resulted in substantial damage to right wing. Postaccident examination revealed the aft main landing gear trunnion pin for the right main landing gear was not properly installed during the recent maintenance as the aft trunnion pin was not installed far enough to allow the retaining roll pin to engage and retain the trunnion pin. The pilot reported and maintenance records showed that maintenance performed by the aircraft manufacturer’s service center, which included the reinstallation of the main landing gear trunnion pin, occurred 2.9 hours before the accident. According to the manufacturer’s maintenance manual installation procedures, maintenance personnel are required to make sure the aft end of the trunnion pin is at least 2.0 inches (50.8 mm) forward of the aft spar fitting to verify proper installation. The Civil Aviation Accident and Incident Investigation Commission (CIAIAC) of Spain investigated a similar accident that occurred on May 4, 2018, as documented in CIAIAC Report A-012/2018. As a result of the investigation, the aircraft manufacturer published a mandatory service letter (SL525C-32-12) to do an inspection of the aft main landing trunnion pins for proper installation. ## Aircraft - Registration: [N361MB](https://openairdocs.org/aircraft/N361MB), registered now, S/N 525C0361, built 2021 (OpenAirDocs) - Reported make and model: TEXTRON AVIATION INC 525C - Registry model: [Textron 525C](https://openairdocs.org/model/textron-525c) (registry code 2076628) (OpenAirDocs) - Registry engine: [Williams FJ44-4A](https://openairdocs.org/engine/williams-fj44-4a) (registry code 66011, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 525C0361 - Year built: 2021 - Airframe hours: 1484 - Engines: Williams FJ44-4A 3621 lbs thrust turbo fan; Williams FJ44-4A 3621 lbs thrust turbo fan - Damage: Substantial damage - Flight: Positioning, Part 91 - Operator: Pacifia LLC - Registered owner: Pacifia LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 22, 2025, 2.9 hours before - Departed: PNS, Pensacola, FL - Destination: Same as departure - Flight plan: IFR - Airport: BTR, Baton Rouge Metropolitan Airport, Ryan Field, runway 31, 7,005 × 150 ft, asphalt - Equipment: Onboard weather, Electronic primary flight display, Electronic multifunction display, Electronic flight bag or handheld device, Data recorder, Auto-pilot, Angle of attack indicator, ADS-B, Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; injuries: none; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review September 13, 2025; seat: left; restraint: 4-point; flight hours: 14,000 total, 1,300 in this make and model, 13,000 as pilot in command, 35 in the last 90 days, 35 in the last 30 days, 0 in the last 24 hours - Co-pilot; age 22; injuries: none; flight instructor, airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review July 17, 2025; seat: right; restraint: 4-point; flight hours: 1,813 total, 396 in this make and model, 1,607 as pilot in command, 79 in the last 90 days, 8 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 260° at 3 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 70 °F - Altimeter: 29.89 inHg - Observed at: BRT ## 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 20250925014999A](https://openairdocs.org/incident/20250925014999A), Sep 25, 2025: Textron Aviation Inc 525C, Baton Rouge, LA, Substantial damage. On September 25, 2025, at appx 1730, the Cessna citationjet (CE-525) landed at Baton Rouge, LA airport (btr) runway 31 the right-hand (RH) main landing gear… ## Docket (7 files) The files NTSB released with the investigation on December 11, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=201748. 11.5 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 1.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19413793&FileExtension=pdf&FileName=6120%20Master_Redacted-Rel.pdf - Memorandum for record a�� FAA (item 2, PDF, 1 page, 63 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19520844&FileExtension=pdf&FileName=MOR%20Template%20FAA-Rel.pdf - ADS-B flight track (item 3, KML, 82 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19419311&FileExtension=kml&FileName=N361MB-track-EGM96-Rel.kml - Aircraft logbooks (item 4, PDF, 7 pages, 4.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19415435&FileExtension=pdf&FileName=Aircraft%20Log%20Master_Redacted-Rel.pdf - Excerpts of the maintenance manual (item 5, PDF, 16 pages, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19522567&FileExtension=pdf&FileName=ml-c-525c-c525cmm746-Rel.pdf - Service letter SL525C-32-12 (item 6, PDF, 8 pages, 405 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19416544&FileExtension=pdf&FileName=SL525C-32-12-Rel.pdf - Photos (item 7, PDF, 5 pages, 746 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=19420373&FileExtension=pdf&FileName=Photo%20Template-Rel.pdf 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.