# NTSB WPR12CA008: Cessna 172P, N52013, Cornelius, OR, October 12, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: October 12, 2011, 14:30 local (21:30 UTC) - Place: Cornelius, OR - Coordinates: 45.5825, -123.05278 - Nearby events: https://openairdocs.org/map.md?lat=45.5825&lon=-123.0528&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Abnormal runway contact](https://openairdocs.org/ntsb-events/090) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report December 13, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: FAA FSDO - NTSB case key (mKey): 82054 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA008 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/82054/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=82054 - Page: https://openairdocs.org/ntsb/WPR12CA008 ## Probable cause The airplane’s encounter with an unseen hole or obstacle on the grass runway. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Runway/land/takeoff/taxi surface](https://openairdocs.org/ntsb-findings/03023000): Environmental issues › Physical environment · Awareness of condition (probable cause); cases with it: [Cessna 172P, 2 cases](https://openairdocs.org/ntsb-findings/03023000/cases.md?model=2072436), [All aircraft, 253 cases](https://openairdocs.org/ntsb-findings/03023000/cases.md) - [Info processing/decision: identification/recognition](https://openairdocs.org/ntsb-findings/02041510): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [Cessna 172P, 3 cases](https://openairdocs.org/ntsb-findings/02041510/cases.md?model=2072436), [All aircraft, 559 cases](https://openairdocs.org/ntsb-findings/02041510/cases.md) - [Terrain: rough terrain](https://openairdocs.org/ntsb-findings/03021015): Environmental issues › Physical environment · Effect on equipment; cases with it: [Cessna 172P, 1 case](https://openairdocs.org/ntsb-findings/03021015/cases.md?model=2072436), [All aircraft, 442 cases](https://openairdocs.org/ntsb-findings/03021015/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Emergency descent: Simulated/training event](https://openairdocs.org/ntsb-events/600); cases with it: [Cessna 172P, 2 cases](https://openairdocs.org/ntsb-events/600/sequence.md?model=2072436), [All aircraft, 173 cases](https://openairdocs.org/ntsb-events/600/sequence.md) - [Landing-flare/touchdown: Abnormal runway contact](https://openairdocs.org/ntsb-events/090) (defining event); cases with it: [Cessna 172P, 16 cases](https://openairdocs.org/ntsb-events/090/sequence.md?model=2072436), [All aircraft, 1,506 cases](https://openairdocs.org/ntsb-events/090/sequence.md) - [Landing-flare/touchdown: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 172P, 45 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072436), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis During the training flight, the certified flight instructor (CFI) initiated a simulated engine power failure. The student pilot responded by establishing a glide speed of 65 knots and maneuvering to a nearby grass runway. During the final approach segment, with twenty degrees of flaps, the student pilot entered a slip and landed uneventfully. However, during the landing roll, the airplane hit a “hole or obstacle” and then bounced. The CFI applied power, aborted the landing, and returned to the departure airport. The aft fuselage sustained structural damage and skin deformation. The CFI reported no mechanical malfunctions or failures with the airplane. ## Factual narrative The certified flight instructor (CFI) reported that during the training flight he initiated a simulated engine power failure. The student pilot trimmed the airplane for a glide speed of 65 knots and maneuvered to a nearby grass runway. During the final approach segment, with twenty-degrees of flaps, the student pilot entered a slip. The CFI reported that shortly thereafter the airplane landed. He reported that during the landing roll the airplane hit a “hole or obstacle” and the airplane bounced. The CFI applied power and aborted the landing. After returning to the departure airport, structural damage and skin deformation was discovered to the aft fuselage. The operator reported damage to longerons and an aft bulkhead. The operator reported no mechanical malfunctions or failures with the airplane. ## Aircraft - Registration: [N52013](https://openairdocs.org/aircraft/N52013), registered now, S/N 17274394, built 1980 (OpenAirDocs) - Reported make and model: CESSNA 172P - Registry model: [Cessna 172P](https://openairdocs.org/model/cessna-172p) (registry code 2072436) (OpenAirDocs) - Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 17274394 - Airframe hours: 14946 - Engines: LYCOMING O-320 SERIES 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Hillsboro Aviation Inc - Registered owner: Hillsboro Aviation Inc - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 22, 2011, 96 hours before - Departed: KHIO, Hillsboro, OR - Destination: 4S4, Cornelius, OR - Flight plan: Unknown - Airport: 4S4, Skyport Airport, runway 34, 2,000 × 45 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 67; injuries: none; commercial, flight instructor; airplane ratings: single-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review October 21, 2009; seat: right; flight hours: 10,000 total, 1,500 in this make and model, 9,000 as pilot in command, 140 in the last 90 days, 30 in the last 30 days, 3 in the last 24 hours - Student pilot; age 40; injuries: none; student; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; seat: left ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 2,500 ft broken ## 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 20111012024359A](https://openairdocs.org/incident/20111012024359A), Oct 12, 2011: Cessna 172P, Hillsboro, OR, Substantial damage. Shortly after landing on a grass strip the aircraft hit a bump and the aircraft bounced back into the air. The instructor then added power and the returned to… ## Docket (1 files) The files NTSB released with the investigation on October 28, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=82054. 1.2 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40356375&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.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.