# NTSB CEN11CA524: Texas Helicopter OH-13H/M74A, N10009, Creston, IL, July 28, 2011 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Data collection · Final report - Date: July 27, 2011, 19:30 local (Jul 28, 2011, 00:30 UTC) - Place: Creston, IL - Coordinates: 41.945278, -88.923889 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.9453&lon=-88.9239&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Dynamic rollover](https://openairdocs.org/ntsb-events/231) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report October 6, 2011 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 81264 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN11CA524 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81264/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81264 - Page: https://openairdocs.org/ntsb/CEN11CA524 ## Probable cause The pilot's failure to maintain adequate skid clearance from the helicopter cart during landing, resulting in a dynamic rollover. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Texas Helicopter OH-13H/M74A, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=8930105), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-flare/touchdown: Dynamic rollover](https://openairdocs.org/ntsb-events/231) (defining event); cases with it: [Texas Helicopter OH-13H/M74A, 1 case](https://openairdocs.org/ntsb-events/231/sequence.md?model=8930105), [All aircraft, 161 cases](https://openairdocs.org/ntsb-events/231/sequence.md) - [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Texas Helicopter OH-13H/M74A, 2 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=8930105), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis According to the pilot, he was landing the helicopter on a helicopter cart when its skid got caught on the cart and the helicopter subsequently rolled over. The pilot reported there were no mechanical malfunctions with the helicopter during the flight, and substantial damage was sustained to the helicopter tailboom when it rolled. Dynamic rollover is the tendency of a helicopter to continue rolling when the critical angle is exceeded, if one skid is on the ground, and the helicopter is pivoting around that point. Dynamic rollover is possible when a skid is caught by a projection on the surface or when landing on a slope. ## Factual narrative The pilot was landing the helicopter on a helicopter cart. He said that the helicopter's skid got caught on the cart and the helicopter subsequently rolled over. There were no mechanical malfunctions with the helicopter during the flight. The helicopter sustained substantial damage to its tailboom when it rolled. ## Aircraft - Registration: [N10009](https://openairdocs.org/aircraft/N10009), registered now, S/N 79-032, built 1979 (OpenAirDocs) - Reported make and model: TEXAS HELICOPTER CORP OH-13H/M74A - Registry model: [Texas Helicopter OH-13H/M74A](https://openairdocs.org/model/texas-helicopter-oh-13h-m74a) (registry code 8930105) (OpenAirDocs) - Registry engine: [Lycoming VO-435 series](https://openairdocs.org/engine/lycoming-vo-435-series) (registry code 41525, reciprocating) (OpenAirDocs) - Category: Helicopter - Serial number: 79-032 - Airframe hours: 5347 - Engines: LYCOMING VO-435 SERIES 260 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Hendrickson Flying Service Inc - Registered owner: Hendrickson Flying Service Inc - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, July 10, 2010 - Departed: IL93, Creston, IL - Destination: IL93, Creston, IL - Airport: IL93, Hendrickson Flying Service ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; injuries: minor; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane, helicopter; medical: class 2, with waivers/limitations; last flight review December 10, 2010; seat: single; flight hours: 8,772 total, 1,800 in this make and model, 8,674 as pilot in command, 150 in the last 90 days, 108 in the last 30 days, 9 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 75 °F - Altimeter: 29.79 inHg - Observed at: RPJ, 10 nm away ## 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 20110727016969A](https://openairdocs.org/incident/20110727016969A), Jul 27, 2011: Texas Helicopter Corp OH-13H/M74A, Creston, IL, Substantial damage. Pilot had been Flying all day. He returned to base and in the process of landing, he hooked a skid and rolled over. ## Other investigations on N10009 (3) 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 CEN16LA284](https://openairdocs.org/ntsb/CEN16LA284), Jul 25, 2016: Texas Helicopter OH 13H/M74A (N10009), Minonk, IL, substantial damage. Probable cause: Failure of the truck driver to ensure that he had adequate clearance to pass under the helicopter and the failure of the loader to park in a safer area for reloading operations. - [NTSB CEN13LA442](https://openairdocs.org/ntsb/CEN13LA442), Jul 29, 2013: Texas Helicopter OH-13H/M74A (N10009), Streator, IL, substantial damage. Probable cause: The pilot's diverted attention during an agricultural application maneuver, which resulted in the helicopter impacting a corn field. - [NTSB CHI04CA180](https://openairdocs.org/ntsb/CHI04CA180), Jul 9, 2004: Texas Helicopter M-74 (N10009), Clear Lake, MN, substantial damage. Probable cause: The pilot failed to maintain a proper glidepath to the landing zone. A factor was the truck pad. ## Docket (2 files) The files NTSB released with the investigation on August 11, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81264. 607 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 558 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40351773&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Miscellaneous - Operator Statement (item 2, .PDF, 50 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40352440&FileExtension=.PDF&FileName=Miscellaneous%20-%20Operator%20Statement-Master.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.