Sunday, August 26, 2018

Mooney M20TN Acclaim, N9306: Accident occurred May 12, 20117 at Granby-Grand County Airport (KGNB), Colorado

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

Additional Participating Entity:

Federal Aviation Administration / Flight Standards District Office; Denver, Colorado

Aviation Accident Factual Report - National Transportation Safety Board: https://app.ntsb.gov/pdf


Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms 
 
http://registry.faa.gov/N9306




Location: Granby, CO
Accident Number: CEN17LA185
Date & Time: 05/12/2017, 1930 MDT
Registration: N9306
Aircraft: MOONEY AIRPLANE CO INC M20TN
Aircraft Damage: Substantial
Defining Event: Loss of engine power (total)
Injuries: 1 None
Flight Conducted Under:  Part 91: General Aviation - Personal 

On May 12, 2017, about 1930 mountain daylight time, a Mooney M20TN, N9306, sustained substantial damage to its right wing during an overrun after a loss of engine power during an aborted landing from runway 27 at Granby-Grand County Airport (GNB), near Granby, Colorado. The pilot was not injured. The aircraft was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which was not on a flight plan. The flight originated from the Centennial Airport (APA), Denver, Colorado, at an unconfirmed time.

The pilot reported that during landing, the airplane bounced and that he added engine power to abort the landing but the engine lost all power. He stated that the propeller was still windmilling and he thought the power loss was due to the high altitude and full rich mixture used on approach. He leaned the fuel mixture thinking that the engine would restart but when it didn't, he applied brakes and attempted to stop on the remaining runway. The airplane overran the end of the runway and was damaged.

The pilot had recently purchased and received flight training in the accident airplane during the previous 2 days. He said that he knew he would be operating the airplane from high altitude airports, including GNB (elevation 8,207 ft), and questioned his flight instructor regarding leaning procedures during approach at high altitude airports. He said that the flight instructor told him to adhere to the procedures in the Pilot's Operating Handbook, which instruct pilots to apply full rich mixture on final approach. The pilot reported that he did so on the accident landing approach, but in retrospect believed that the full rich mixture may have created a situation where the engine was not able to respond to throttle input with the combined high density altitude (8,441 ft), and full rich mixture.

A representative of the airplane manufacturer was queried about the possibility of the engine not responding to throttle input, or the spark plugs fouling, during high altitude approaches due to full rich mixture. The manufacturer did not believe this was possible if the fuel control adjustments were properly set up.

Examination of the airplane revealed that movement of the fuel mixture control arm on the fuel control was striking a fuel hose within the engine compartment. According to the airplane manufacturer, the hose routing found was not as it came from the factory. Although the mixture control arm was striking the hose at the end of its travel it did not appear that the travel of the mixture arm was limited when compared to the factory installation. No other anomalies were found with respect to the airplane or engine; however, the spark plugs and fuel controls were not removed during the engine examination.



Pilot Information

Certificate: Private
Age: 53, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Left
Other Aircraft Rating(s): None
Restraint Used: 3-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 3 With Waivers/Limitations
Last FAA Medical Exam: 06/15/2015
Occupational Pilot: No
Last Flight Review or Equivalent:
Flight Time:  1000 hours (Total, all aircraft), 14 hours (Total, this make and model)



Aircraft and Owner/Operator Information

Aircraft Make: MOONEY AIRPLANE CO INC
Registration: N9306
Model/Series: M20TN NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 2008
Amateur Built: No
Airworthiness Certificate: Normal
Serial Number: 31-0095
Landing Gear Type: Retractable - Tricycle
Seats: 4
Date/Type of Last Inspection:  Unknown
Certified Max Gross Wt.: 3369 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time:
Engine Manufacturer: CONT MOTOR
ELT:
Engine Model/Series: TSIO-550-G
Registered Owner: On file
Rated Power: 300 hp
Operator: On file
Operating Certificate(s) Held: None

Meteorological Information and Flight Plan

Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: 0CO, 12442 ft msl
Distance from Accident Site: 19 Nautical Miles
Observation Time: 0125 UTC
Direction from Accident Site: 180°
Lowest Cloud Condition: Clear
Visibility:  10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 4 knots /
Turbulence Type Forecast/Actual: /
Wind Direction: 140°
Turbulence Severity Forecast/Actual: /
Altimeter Setting: 30.34 inches Hg
Temperature/Dew Point: 4°C / -1°C
Precipitation and Obscuration:  No Obscuration; No Precipitation
Departure Point: DENVER, CO (APA)
Type of Flight Plan Filed: None
Destination: Granby, CO (GNB)
Type of Clearance: None
Departure Time:
Type of Airspace: Class G

Airport Information

Airport: GRANBY-GRAND COUNTY (GNB)
Runway Surface Type: Asphalt
Airport Elevation: 8207 ft
Runway Surface Condition: Dry
Runway Used: 27
IFR Approach: None
Runway Length/Width: 5000 ft / 75 ft
VFR Approach/Landing: Go Around

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:  40.090000, -105.916667



NTSB Identification: CEN17LA185 
14 CFR Part 91: General Aviation
Accident occurred Friday, May 12, 2017 in Grandby, CO
Aircraft: MOONEY AIRPLANE CO INC M20TN, registration: N9306
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On May 12, 2017, about 1930 mountain daylight time, a Mooney M20TN, N9306, sustained substantial damage to its right wing during an overrun after a loss of engine power during go-around from runway 27 at the Granby-Grand County Airport (GNB), near Granby, Colorado. The pilot was not injured. The aircraft was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a[personal flight. Visual meteorological conditions prevailed for the flight, which was not on a flight plan. The local flight originated at an unconfirmed time.

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