# NTSB WPR15LA137: Piper PA 46-310P, N9133G, Redmond, OR, March 1, 2015 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: March 1, 2015, 09:40 local (17:40 UTC) - Place: Redmond, OR - Coordinates: 44.253887, -121.150001 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.2539&lon=-121.1500&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Defining event: [Enroute-cruise: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report September 6, 2017 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: FAA, Continental Motors Inc - NTSB case key (mKey): 90955 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR15LA137 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/90955/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=90955 - Page: https://openairdocs.org/ntsb/WPR15LA137 ## Probable cause A loss of engine power during cruise flight for reasons that could not be determined because postaccident examination of the engine did not reveal any anomalies that would have precluded normal operation. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Piper PA-46-310P, 5 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=7104605), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Enroute-cruise: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Piper PA-46-310P, 11 cases](https://openairdocs.org/ntsb-events/341/sequence.md?model=7104605), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Piper PA-46-310P, 6 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=7104605), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The private pilot reported that, about 30 minutes into the private, cross-country flight and while the airplane was cruising at 23,000 ft mean sea level, the engine started running roughly. The pilot noticed that the No. 5 cylinder head temperature (CHT) was lower than normal. He cycled the magnetos and noticed that the engine ran rougher than normal when the left magneto was selected. He then enriched the mixture, and the engine smoothed out. He continued to monitor the engine and adjust the mixture. About 30 minutes later, the engine lost power. The pilot diverted to a nearby airport and attempted to line up for a runway but did not have sufficient altitude. He performed a forced landing to the airport infield, which resulted in the nose landing gear collapsing and structural damage to the wing spar. Postaccident examination of the engine did not reveal any anomalies that would have precluded normal operation. During an engine test run up to full power, the only anomaly noted was that the No. 5 CHT was 50 to 70° lower than all the other cylinders. However, the lower CHT likely would not cause a loss of engine power. ## Factual narrative On March 1, 2015, at 0940 Pacific standard time, a Piper PA-46-310P, N9133G, executed a forced landing into Roberts Field Airport, Redmond, Oregon, after a loss of engine power. The airplane was registered to, and operated by, the private pilot under the provisions of 14 Code of Federal Regulations, Part 91. The pilot was not injured, and the airplane sustained substantial damage to both wings. Visual meteorological conditions prevailed, and an instrument flight plan had been filed. The flight originated from Oak Harbor, Washington, at 0800.The pilot reported that he was cruising at 23,000 feet mean sea level (msl) when he noticed the engine running a bit rough as he passed Portland, Oregon. He noticed that the number 5 cylinder head temperature (cht) was lower than normal. The pilot cycled the magnetos and noticed that the engine ran rougher than normal when the left magneto was selected. The engine smoothed out when he enriched the mixture. He continued to monitor the engine and adjusting the mixture. About 30 minutes later engine power completely dropped off. The pilot diverted to Roberts Field, Redmond, Oregon, using his GPS for navigation. About 2 miles out he acquired the airport visually, and attempted to line up for a runway but did not have enough altitude. He performed a forced landing into the airport infield. The landing resulted in a collapsed nose landing gear, and wing spar damage at both main landing gear mounts. On March 3, 2015, an airframe and power plants (A&P) mechanic examined the airplane under the supervision of a Federal Aviation Administration (FAA) inspector. He reported on the airframe structural damage, and that he found no obvious reason for the loss of engine power. The airplane was then relocated to a facility in Greeley, Colorado, for further examination. The airplane was equipped with a EDM 930 engine data monitoring system. On April 14 the data from the EDM 930 was downloaded and sent to the NTSB Investigator-in-Charge (IIC). The data showed that about 25 minutes before the loss of engine power the number 5 cylinder head temperature (cht) started to trend about 50°F below its previous steady temperature (300°F), and then fluctuate twice between 300°F – 250°F during the last 12 minutes. The exhaust gas temperature (egt) remained steady for cylinder number 5 throughout the record. All the remaining cylinders exhibited steady egt and cht values. On May 13, 2015, the NTSB IIC, and a technical representative from the engine manufacturer examined the airplane. A fuel sample was taken from the fuel strainer. The fuel sample was light green in color and tested negative for water or kerosene/jet fuel contamination. Results of a chemical analysis confirmed that the sample was chemically consistent with 100LL avgas. The engine was examined externally, the cylinders bore scoped, sparkplugs inspected, internal magneto timing verified, and internal continuity confirmed by rotating the propeller/crankshaft. The number 5cylinder fuel injection nozzle was removed, examined, and found to be in good condition with no blockages. An external fuel tank was plumbed into the right-wing fuel outlet and an external priming pump placed inline. The engine started on the first attempt, ran smoothly at idle, magneto checked performed, and the engine was run up to red line producing full power. No anomalies were noted during the engine run other than that the number 5 cylinder head temperature was notably 50°-70°F cooler than all the other cylinders. ## Aircraft - Registration: [N9133G](https://openairdocs.org/aircraft/N9133G), registered now, S/N 4608111, built 1988 (OpenAirDocs) - Reported make and model: PIPER PA 46-310P - Registry model: [Piper PA-46-310P](https://openairdocs.org/model/piper-pa-46-310p) (registry code 7104605) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 4608111 - Year built: 1988 - Airframe hours: 3208.3 - Engines: CONT MOTOR TSIO-520 SER reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 16, 2014, 94 hours before - Departed: KFHR, Friday Harbor, WA - Destination: KVGT, North Las Vegas, NV - Flight plan: IFR - Airport: KRDM, Roberts Field Airport - Equipment: Onboard weather, Stall warning system, ADS-B, Auto-pilot, Electronic flight bag or handheld device, Electronic multifunction display ## 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, waiver time limited special; last flight review April 22, 2014; seat: left; restraint: 3-point; flight hours: 2,572 total, 1,299 in this make and model, 90 in the last 90 days, 29 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 34 °F, dew point 16 °F - Altimeter: 30.19 inHg - Observed at: KRDM ## 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 20150301002719A](https://openairdocs.org/incident/20150301002719A), Mar 1, 2015: Piper PA-46-310P, Redmond, OR, Substantial damage. Pilot enroute from Friday harbor, WA to north las vegas, NV, experienced engine power loss at at FL 230 as indicated by a loss of manifold pressure and… ## Docket (7 files) The files NTSB released with the investigation on July 24, 2017, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=90955. 3.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 407 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454475&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Pilot's Statement (item 2, .PDF, 175 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454476&FileExtension=.PDF&FileName=Pilot%27s%20Statement-Master.PDF - Wreckage Examination Report (item 3, .PDF, 8 photos, 905 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454477&FileExtension=.PDF&FileName=Wreckage%20Examination%20Report-Master.PDF - Engine Monitoring Data Plots (item 4, .PDF, 2.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454478&FileExtension=.PDF&FileName=Engine%20Monitoring%20Data%20Plots-Master.PDF - Fuel Sample Analysis (item 5, .PDF, 158 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454479&FileExtension=.PDF&FileName=Fuel%20Sample%20Analysis-Master.PDF - Statement of Party Representatives to NTSB Investigation (item 6, .PDF, 89 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454480&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Master.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 7, .PDF, 69 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40454481&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-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.