# NTSB CEN21LA312: Piper PA 46-350P, N110ST, St. Louis, MO, June 24, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: June 24, 2021, 13:17 local (18:17 UTC) - Place: St. Louis, MO - Coordinates: 38.745331, -90.353213 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.7453&lon=-90.3532&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Central Region - Parties: FAA St. Louis FSDO - NTSB case key (mKey): 103447 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN21LA312 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/103447/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=103447 - Page: https://openairdocs.org/ntsb/CEN21LA312 ## Probable cause The pilot’s failure to maintain directional control during the landing roll with hydroplaning conditions. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Aircraft capability: braking capability](https://openairdocs.org/ntsb-findings/01061050): Aircraft › Aircraft oper/perf/capability · Attain/maintain not possible (probable cause); cases with it: [Piper PA 46-350P, 1 case](https://openairdocs.org/ntsb-findings/01061050/cases.md?model=7104620), [All aircraft, 57 cases](https://openairdocs.org/ntsb-findings/01061050/cases.md) - [Runway/land/takeoff/taxi surface: wet surface](https://openairdocs.org/ntsb-findings/03023010): Environmental issues › Physical environment · Ability to respond/compensate (probable cause); cases with it: [Piper PA 46-350P, 2 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md?model=7104620), [All aircraft, 141 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Piper PA 46-350P, 40 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=7104620), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Runway/land/takeoff/taxi surface: wet surface](https://openairdocs.org/ntsb-findings/03023010): Environmental issues › Physical environment · Contributed to outcome (probable cause); cases with it: [Piper PA 46-350P, 2 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md?model=7104620), [All aircraft, 141 cases](https://openairdocs.org/ntsb-findings/03023010/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Abnormal runway contact](https://openairdocs.org/ntsb-events/090); cases with it: [Piper PA 46-350P, 3 cases](https://openairdocs.org/ntsb-events/090/sequence.md?model=7104620), [All aircraft, 1,506 cases](https://openairdocs.org/ntsb-events/090/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Piper PA 46-350P, 14 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7104620), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Piper PA 46-350P, 20 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=7104620), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Piper PA 46-350P, 19 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=7104620), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The pilot reported that while landing on a wet runway and as he applied brakes during the landing roll, the airplane began to hydroplane, and the nose landing gear collapsed. The airplane veered left and exited the side of the runway coming to a stop in the grass. The airplane sustained substantial damage to the engine mount. The pilot reported there were no preimpact mechanical failures or malfunctions with the airframe and engine that would have precluded normal operation. A review of the airplane’s maintenance records revealed that Piper Aircraft Service Bulletin (SB) 1103F (a recurring inspection of the engine mount for cracks every 100 hours) was complied with only once in the airplane’s service history, which was about 437 hours before the accident occurred. Based on the available information, it was undetermined if any preexisting defects in the engine mount contributed to nose landing gear collapse. The pilot reported the accident could have been prevented by “not applying brakes” and allowing a “continued roll out.” ## Aircraft - Registration: [N110ST](https://openairdocs.org/aircraft/N110ST), registered now, S/N 4636373, built 2005 (OpenAirDocs) - Reported make and model: PIPER PA 46-350P - Registry model: [Piper PA 46-350P](https://openairdocs.org/model/piper-pa-46-350p) (registry code 7104620) (OpenAirDocs) - Registry engine: [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series) (registry code 41533, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 4636373 - Year built: 2005 - Airframe hours: 1814 - Engines: Lycoming Engines TIO-540-AE2A 350 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 16, 2020 - Departed: TRI, Blountville, TN - Destination: Same as departure - Flight plan: IFR - Airport: STL, St Louis Lambert Intl, runway 12L/30R, 9,003 × 150 ft, concrete - Equipment: Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 68; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review February 11, 2020; seat: left; restraint: 3-point; flight hours: 6,057 total, 1,346 in this make and model, 6,000 as pilot in command, 30 in the last 90 days, 17 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 240° at 12 knots - Visibility: 10 statute miles - Lowest ceiling: 13,000 ft broken - Temperature: 81 °F, dew point 70 °F - Altimeter: 30.01 inHg - Observed at: KSTL, 1 nm away - METAR: KSTL 241825Z 24012KT 10SM -RA FEW050 SCT070 BKN130 OVC250 27/21 A3001 RMK ## 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 20210624010389A](https://openairdocs.org/incident/20210624010389A), Jun 24, 2021: Piper PA 46-350P, St Louis, MO, Substantial damage. After touchdown on (kstl) runway 30R, the airplane veered to the left when the nose gear was lowered to the runway and applied braking action. The pilot… ## Docket (3 files) The files NTSB released with the investigation on September 9, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=103447. 13.6 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 10 pages, 4.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12527067&FileExtension=pdf&FileName=NTSB%20Form%206120_1%20Redacted-Rel.pdf - Accident photographs (item 2, PDF, 8 pages, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12527253&FileExtension=pdf&FileName=Accident%20Photographs-Rel.pdf - Additional documents (item 3, PDF, 44 pages, 7.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12527455&FileExtension=pdf&FileName=Additional%20Documents%20Redacted-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.