# NTSB WPR11LA246: Scottish Series 100 MDL 101, N101MY, Chandler, AZ, June 3, 2011

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: June 2, 2011, 20:00 local (Jun 3, 2011, 03:00 UTC)
- Place: Chandler, AZ
- Coordinates: 33.266666, -111.75 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=33.2667&lon=-111.7500&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Defining event: [Approach: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report January 15, 2013
- Report: Approved by Office Director
- NTSB office: Western Pacific Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 79294
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11LA246
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/79294/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=79294
- Page: https://openairdocs.org/ntsb/WPR11LA246

## Probable cause

A loss of engine power during cruise flight for reasons that could not be determined because postaccident examination 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: [Scottish SERIES 100 MDL 101, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=8060105), [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.

- [Approach: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [Scottish SERIES 100 MDL 101, 1 case](https://openairdocs.org/ntsb-events/342/sequence.md?model=8060105), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md)
- [Emergency descent: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Scottish SERIES 100 MDL 101, 2 cases](https://openairdocs.org/ntsb-events/440/sequence.md?model=8060105), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md)
- [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Scottish SERIES 100 MDL 101, 1 case](https://openairdocs.org/ntsb-events/096/sequence.md?model=8060105), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md)

## Analysis

The pilot reported that the engine surged and sustained a partial loss of engine power during a local night flight. He attempted to restore engine power, but was unsuccessful and made a forced landing to an open field where the airplane impacted a ditch, collapsing the landing gear and bending the firewall during the landing roll. The pilot said that the entire flight was performed with the fuel selector on the “BOTH” position and that when the engine first began to surge, the fuel gauges registered a quarter of capacity in each tank. The fuel system consisted of inner and outer interconnected tanks in each wing, which supplied fuel through a non-return valve to a fuel selector, a filter, and a booster pump grouped together near the front left seat, then through the engine-driven pump to the injector unit. Unusable fuel in each wing is 0.5 gallons. Airplane recovery personnel said that no fuel was found in the left wing tanks and about 8 gallons of fuel were found in the right wing tanks, although the gear collapse may have allowed fuel to migrate from the high wing to the low wing. The airplane was examined and no fuel system discrepancies were found. The engine was test run in the airframe and it started and ran normally.

## Factual narrative

On June 2, 2011, about 2000 mountain standard time, a Scottish Aviation, Series 100 MDL 101, N101MY, experienced a partial loss of engine power during cruise flight about 4 miles east of Chandler, Arizona. The pilot made a forced landing in an open field. During rollout, the airplane's nose gear collapsed upon overrunning a ditch in the soft terrain, and the firewall was bent. The airplane was substantially damaged. Neither the airline transport pilot nor passenger was injured. The airplane was owned by the pilot, and it was operated under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed. No flight plan was filed for the local area personal flight that originated from Chandler about 1915. The pilot reported to the National Transportation Safety Board investigator that the airplane was equipped with two interconnected fuel tanks in each wing. When the engine surged and power was lost, both of the wings' fuel tank gauges registered about 1/4-full. The pilot stated that he attempted to reacquire engine power, but he was not successful. As the airplane's altitude decreased, he redirected his attention to executing the forced landing. The pilot said that the entire flight was performed with the fuel selector on the “BOTH” position. Airplane recovery personnel reported to the Safety Board investigator that no fuel was found in the left wing tanks. About 8 gallons of fuel were found in the right wing tanks. According to the Pilot’s Operating Handbook, the fuel system consists of an inner and outer interconnected tank in each wing supplying fuel through a non-return valve to a fuel selector, a filter and a booster pump grouped together beneath the floor in front of the left hand front seat and thence through the engine-driven pump to the injector unit. The fuel selector is marked FUEL. OFF-L (ie, Left tank) - BOTH - R (ie, Right tank). Unusable fuel on either wing is 0.5 gallons. On June 15, the airplane was examined by Federal Aviation Administration inspectors, who reported that no fuel system discrepancies were found. The engine was test run in the airframe and it started and ran normally.

## Aircraft

- Registration: [N101MY](https://openairdocs.org/deregistered/N101MY-2015-05-13), registration cancelled 2015-05-13, S/N 166, built 1994 (OpenAirDocs)
- Reported make and model: SCOTTISH AVIATION SERIES 100 MDL 101
- Registry model: [Scottish SERIES 100 MDL 101](https://openairdocs.org/model/scottish-series-100-mdl-101) (registry code 8060105) (OpenAirDocs)
- Registry engine: [Lycoming IO-360-A1B6](https://openairdocs.org/engine/lycoming-io-360-a1b6) (registry code 41576, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 166
- Airframe hours: 4815
- Engines: LYCOMING IO-360-A1B6 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Aerobatic; Special, Experimental (Special)
- Last inspection: Condition, August 14, 2010, 13 hours before
- Departed: CHD, Chandler, AZ
- Destination: CHD, Chandler, AZ
- Airport: CHD, Chandler Municipal

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 64; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review February 21, 2011; seat: left; flight hours: 28,000 total, 300 in this make and model, 20,000 as pilot in command, 10 in the last 90 days, 3 in the last 30 days

## Weather

- Conditions: Visual (VMC), Dusk
- Visibility: 10 statute miles
- Lowest ceiling: none

## 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 20110602013219A](https://openairdocs.org/incident/20110602013219A), Jun 2, 2011: Scottish Aviation SERIES 100 MDL 101, Chandler, AZ, Substantial damage. Loss of power. Possible ran out of fuel, to be determined as soon as NTSB authorizes engine run.06/15/2011; witness engine run. Engine failed to start. Suspect…

## Docket (5 files)

The files NTSB released with the investigation on November 15, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=79294. 896 KB in all.

- Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 560 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380854&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF
- Record of Conversation - FAA (item 2, .PDF, 63 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380855&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20FAA-Master.PDF
- Statements of PIC and Jarman (item 3, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380856&FileExtension=.PDF&FileName=Statements%20of%20PIC%20and%20Jarman-Redacted.PDF
- POH Extract (item 4, .PDF, 156 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380857&FileExtension=.PDF&FileName=POH%20Extract-Redacted.PDF
- Release of Aircraft Wreckage, NTSB Form 6120.15 (item 5, .PDF, 64 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380858&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-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.