Wednesday, July 31, 2019

Ayres S2R-G10, N766BF: Accident occurred July 21, 2019 in Breckenridge, Gratiot County, Michigan

The National Transportation Safety Board did not travel to the scene of this accident. 

Additional Participating Entities:

Federal Aviation Administration / Flight Standards District Office; Grand Rapids, Michigan
Honeywell; Phoenix, Arizona 

Aviation Accident Preliminary Report - National Transportation Safety Board:

Location: Breckenridge, MI

Accident Number: CEN19LA231
Date & Time: 07/21/2019, 0705 EDT
Registration: N766BF
Aircraft: Ayres S2R
Injuries: 1 None
Flight Conducted Under: Part 137: Agricultural

On July 21, 2019, about 0705 eastern daylight time, an Ayres S2R-G10 airplane, N766BF, impacted terrain during a forced landing after a loss of engine power shortly after takeoff from a private airstrip near Breckenridge, Michigan. The commercial pilot was not injured, and the airplane was substantially damaged. The airplane was registered to and operated by Earl's Spray Service, Inc. as a Title 14 Code of Federal Regulations (CFR) Part 137 flight. Day visual meteorological conditions prevailed, and no flight plan was filed for the local agricultural application flight.

The pilot stated that the accident occurred on his second agricultural application flight of the day. The first flight was completed without any issues. The pilot reported that the airplane was loaded with 325 gallons of fungicide and water, and that the fuel tank contained about 60 gallons of Jet-A fuel, before he departed on the accident flight. The pilot stated that shortly after takeoff on runway 27, about 100 ft above the ground, he observed a sudden increase in exhaust gas temperature above the redline limit. He immediately reduced throttle, but the engine had a total loss of engine power. The pilot turned on the igniters to restart the engine, but the low altitude of the airplane required an immediate forced landing in a cornfield. The pilot lowered the flaps and leveled the wings for landing, but the main landing gear collapsed when it contacted the corn. After the accident, the pilot pulled the emergency fuel cutoff, and turned off the igniters, generator, and battery.

The airplane was equipped with an Electronics International MVP-50T-TI-G10 digital engine monitor, serial number 173643. The device was removed from the airplane and shipped to the National Transportation Safety Board (NTSB) Investigator-In-Charge to be downloaded. The recovered data indicated that there was a sudden and total loss of engine oil pressure that resulted in a corresponding drop in engine speed (N1), fuel flow, and fuel pressure. The exhaust temperature increased from 535°C to 850°C during the 10 seconds after the loss of engine oil pressure.

Figure 1. Engine Monitor Data Plot 

The engine, a Honeywell TPE-331-10-511M, serial number P42076C, was retained for additional examination at the manufacturer. The engine was last inspected during a 100-hour Inspection completed on July 19, 2019, at which time it had accumulated 16,857 hours since new and 603.9 hours since its last overhaul. The airplane had accumulated an additional 2 engine starts, 4 landings, and 1.74 hours since the 100-hour inspection. 

Aircraft and Owner/Operator Information

Aircraft Make: Ayres
Registration: N766BF
Model/Series: S2R G10
Aircraft Category: Airplane
Amateur Built: No
Operator: Earl's Spray Service Inc
Operating Certificate(s) Held: Agricultural Aircraft (137)

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: AMN, 754 ft msl
Observation Time: 0656 EDT
Distance from Accident Site: 15 Nautical Miles
Temperature/Dew Point: 21°C / 20°C
Lowest Cloud Condition: Clear
Wind Speed/Gusts, Direction: 4 knots / , 340°
Lowest Ceiling: None
Visibility:  10 Miles
Altimeter Setting: 29.95 inches Hg
Type of Flight Plan Filed: None
Departure Point: Breckenridge, MI (PVT)
Destination: Breckenridge, MI (PVT)

Wreckage and Impact Information

Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 43.484167, -84.484444

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