# NTSB WPR19TA037: Scottish Series 100 MDL 101, N82696, Lake Pleasant, AZ, November 17, 2018 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Class 3 · Final report - Date: November 17, 2018, 13:00 local (20:00 UTC) - Place: Lake Pleasant, AZ - Coordinates: 33.903331, -112.300552 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=33.9033&lon=-112.3006&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Inflight upset](https://openairdocs.org/ntsb-events/271) - Highest injury: Minor injuries - Injuries: 2 minor - Status: Completed - Report: Approved by Office Director - Investigation class: Class 3 - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 98730 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR19TA037 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/98730/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=98730 - Page: https://openairdocs.org/ntsb/WPR19TA037 ## Probable cause Impact with a lake for undetermined reasons. ## 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: [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) - [Performance/control parameters: altitude](https://openairdocs.org/ntsb-findings/01062012): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [All aircraft, 1,310 cases](https://openairdocs.org/ntsb-findings/01062012/cases.md) - [Terrain: water](https://openairdocs.org/ntsb-findings/03021020): Environmental issues › Physical environment · Contributed to outcome (probable cause); cases with it: [All aircraft, 97 cases](https://openairdocs.org/ntsb-findings/03021020/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Inflight upset](https://openairdocs.org/ntsb-events/271) (defining event); cases with it: [All aircraft, 74 cases](https://openairdocs.org/ntsb-events/271/sequence.md) - [Emergency descent: Ditching](https://openairdocs.org/ntsb-events/441); cases with it: [All aircraft, 186 cases](https://openairdocs.org/ntsb-events/441/sequence.md) ## Analysis The pilot reported that during a pleasure flight over a lake, about 700 ft above ground level, the engine started to shake and subsequently lost all power. The pilot attempted to restart the engine by turning the auxiliary fuel pump on, and he dove the airplane toward the water so that the windmilling propeller would help to restart the engine. The engine started, but the pilot estimated that it was only producing about 50% power. The pilot thought that he might be able to maintain or gain some altitude to reach a nearby runway; however, during the climb, the engine lost all power again. The pilot then initiated a forced landing to the lake. Witnesses around the lake reported seeing the airplane flying at low altitude. One witness stated that the engine sounded normal but that the airplane was flying erratically. Another witness saw the airplane about 40 ft above the water. He did not hear any unusual noises emanating from the engine. The airplane and engine remained submerged in the lake for about 3 weeks before recovery. The right wing was not recovered. Cursory examination of the engine revealed continuity to the accessory drive when the propeller was rotated by hand; however, the examination was insufficient to determine whether or for what reason a loss of engine power may have occurred. ## Factual narrative On November 17, 2018, at 1300 mountain standard time, an experimental Scottish Aviation Series 100 MDL 101 airplane, N82696, was substantially damaged when it was involved in an accident near Lake Pleasant, Arizona. The pilot and passenger received minor injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that after takeoff he departed to the north toward a lake for a sightseeing flight. While over the lake at 700 ft above ground level (agl), the engine started to shake and subsequently lost power. The pilot attempted to restart the engine by turning the auxiliary fuel pump on and he dove the airplane toward the water in hopes of the wind milling propeller would help in restarting the engine. The engine started but the pilot estimated that it was only producing about 50% power. The pilot noted a glider port just south of the lake and thought that he might be able to maintain or gain some altitude to make it to the glider port. The pilot initiated a climb, however the engine subsequently lost power again. The pilot then initiated a forced landing to the lake. After touchdown, the pilot and passenger exited the airplane before it sank. Witnesses from different locations around the lake, reported seeing a low-flying airplane in the area. One witness reported that the airplane came over the hills at a low altitude and made a sweeping right turn toward the north. It then gained altitude, where the witness lost sight of it as it disappeared into a canyon. The witness stated that the engine sounded normal, but that the airplane was flying erratically. Another witness at a boat ramp saw the airplane traveling in a westerly direction about 40 ft above the water. He did not hear any unusual noises emanating from the engine. Finally, another witness, traveling in his jet boat reported that the airplane crashed about 20 ft in front him. The airplane was in a nose down attitude. According to the pilot, the engine was rebuilt about 2 years ago and had about 100-150 hours in service. The mixture was about one-half inch lean and the auxiliary pump was in the ON position as he was flying low. The airplane was recovered from the lake 23 days after the accident and transported to a storage facility. An examination of the airplane was performed by Federal Aviation Administration (FAA) inspectors. The engine cowling and right wing were not recovered from the lake. The propeller blades were bent aft. The crankshaft was manually rotated verifying accessory section continuity. The oil dipstick was removed, and several quarts of oil were observed. A visual inspection of the engine oil revealed no debris and it was free of metal shavings. The fuel feed lines at the wing roots were inspected and showed extensive wear to the outer lining; it was frayed, and the inner lining displayed dry rot. Fuel staining was present on the gascolator bowl. The amount of fuel on board was not determined due to water inthe left-wing tank and the separation of the right wing. ## Aircraft - Registration: N82696 (not matched to a registry record) - Reported make and model: Scottish Aviation SERIES 100 MDL 101 (100 101) - Category: Airplane - Serial number: 128 - Year built: 1971 - Engines: Lycoming IO360 SER reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Departed: DVT, Phoenix, AZ - Destination: DVT, Phoenix, AZ - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 63; injuries: minor; private; airplane ratings: single-engine land; seat: left; flight hours: 0 total, 0 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 25 °F - Altimeter: 30.03 inHg - Observed at: KDVT, 17 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 20181117022699A](https://openairdocs.org/incident/20181117022699A), Nov 17, 2018: Scottish Aviation SERIES 100 MDL 101, Peoria, AZ, Destroyed. On November 17, 2018, at approximately 13:00 LCL, a Scottish Aviation ?bulldog? (N82696) crash landed in the north west section of lake pleasant. The flight… ## Docket (4 files) The files NTSB released with the investigation on October 9, 2020, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=98730. 1.7 MB in all. - Pilot's statement (item 1, PDF, 4 pages, 677 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=10121446&FileExtension=pdf&FileName=MTehrani%20ROC%20(FAA)_Redacted-Rel.pdf - Witness statements (item 2, PDF, 6 pages, 504 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=10115476&FileExtension=pdf&FileName=Witness%20Statements-Rel.pdf - FAA inspection report (item 3, PDF, 2 pages, 325 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=10115641&FileExtension=pdf&FileName=N82696%20post%20accident%20inspection-Rel.pdf - Fuel receipt (item 4, PDF, 1 page, 152 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=10115559&FileExtension=pdf&FileName=Sibran%20transactions%2011-17-2018_Redacted-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.