N9149RMooney M20R · 1994

On May 10, 2011, about 1757 eastern daylight time, a Mooney M20R, N9149R, struck trees and terrain during a forced landing after a loss of engine power. The pilot and two passengers received serious injuries. The airplane sustained substantial damage. The airplane was registered to 2201 Inc, Akron, Ohio, and was operated by a private pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which operated without a flight plan. The local flight originated from the Akron Fulton International Airport (AKR), Akron, Ohio. The departure time was estimated to be 1745.

The pilot reported that the flight was a local flight for the purpose of demonstrating the airplane to potential shareholders. He reported that the airplane had 70 gallons of fuel on-board before the flight and that all pre-flight checks were satisfactory. He stated that they performed one takeoff and landing sequence, remaining in the AKR traffic pattern. A second takeoff was performed and the pilot departed the AKR airport area and flew east to demonstrate the avionics of the airplane. He stated that he climbed to 3,200 feet and set the autopilot. He stated that when the airplane was between the Kent State University Airport (1G3), and the Portage County Airport, Ravenna, Ohio (POV, formerly 29G), the engine suddenly stopped. He reported that he switched fuel tanks and attempted two engine restarts to no avail. A forced landing to a field was attempted. The pilot reported that the right wing struck a tree during the attempted forced landing. In an interview with a law enforcement officer after the accident, the pilot estimated having about 30 gallons of fuel in each of the two wing fuel tanks when the power loss occurred.

A passenger in the airplane, who was also a certificated pilot, also reported that the airplane had about 70 gallons of fuel on board before the flight. He reported the same series of events as the pilot. The passenger noted that he could hear the engine trying to run and making noise after it stopped developing power.

A witness who was the first on-scene after the crash reported that the airplane was not making any noise prior to its impact with the tree. When the airplane’s right wing hit the tree, it was ripped from the fuselage. The witness did not see any fuel plume or cloud coming from the wing and she did not recall any smell of fuel at the accident site; however in a previous statement to law enforcement she did note the smell of fuel at the accident site.

Another witness who was the second person on-scene reported seeing the airplane prior to striking the tree. He reported that he could hear the engine attempting to run and making noise. He lost sight of the airplane before it struck the tree. He reported that there was a strong fuel odor at the accident site.

The pilot held a private pilot certificate with airplane single engine land and instrument airplane ratings. He reported having 1045 hours total flight experience including 820 hours in the same make and model airplane as the accident airplane. His most recent flight review was completed on June 15, 2010. He also held a third class medical certificate that was issued on May 11, 2010. The medical certificate listed no limitations.

The airplane involved in the accident, N9149R, was a 1994 Mooney, model M20R, bearing serial number 29-0004. It was a single-engine, low-wing monoplane with retractable tricycle landing gear. It could seat four occupants and was constructed predominately of aluminum. The airplane was powered by a Continental Motors, model IO-550-G engine, bearing serial number 679075. The engine was rated to produce 280 horsepower.

According to aircraft maintenance records, the airplane had undergone an annual inspection on March 1, 2011. The recording hour meter reading at the time of the inspection was 2,048.1 hours. According to the entry, the airplane had accumulated 2049.1 hours, and the engine had accumulated 842.9 hours since its most recent overhaul. At the time of the accident the airplane’s recording hour meter read 2050.4.

At 1758, the weather conditions recorded at POV were: wind from 120 degrees at 7 knots; visibility 10 miles; broken clouds at 9,000 feet agl; temperature 23 degrees Celsius; dew point 4 degrees Celsius; altimeter 29.90 inches of mercury.

The airplane wreckage was removed from the accident site and transported to AKR for subsequent examination. According to the Federal Aviation Administration inspector that was on-site during the airplane's recovery, the left wing tank was nearly full of fuel and an estimated 40 gallons of fuel was removed from the left fuel tank prior to transport.

On June 2, 2011, an examination was conducted with the NTSB investigator in charge present. The airplane was stored on a trailer in a hangar at AKR. Examination of the airplane was conducted with the airplane on the trailer. The fuselage exhibited extensive damage in the cabin section. The cabin roof had been separated from the airplane and the fuselage was buckled. The tail surfaces were not attached to the airplane during the examination. The left wing was on the trailer beneath the fuselage. The right wing was on the floor of the hangar. The left wing exhibited minimal impact damage. A portion of the right wing remained attached to the fuselage. Evidence of upward bending of the wing was present. The right wing fuel tank was compromised and no fuel remained. The interior of the fuel bay was totally exposed where the outboard portion of the wing had separated. The tail surfaces were examined and the left horizontal stabilizer and elevator exhibited minimal impact damage. The right horizontal stabilizer was bent upward at the tip about 30 degrees. The elevator was bent downward. The left elevator remained attached to the stabilizer by the inboard 2 hinges (4 hinges per side). The rudder and vertical stabilizer exhibited minimal impact damage.

Fuel System

The fuel strainer within the right wing tank was clean and unobstructed. The left wing tank fuel strainer was also clean and unobstructed. The fuel selector valve was removed from the airplane. The handle had broken loose from the valve. The valve was in the detent and positioned on the right fuel tank selection which was verified by blowing air through the valve. The gascolator bowl was removed and the internal screen examined. No obstruction of the gascolator was evident. The electric fuel pump was inaccessible but air was blown through the fuel lines and the electric pump exhibited no obstruction. The electric fuel pump was not tested electrically. The mechanical fuel pump was removed from the engine in order to verify engine valve train and accessory gear continuity. A fuel line fitting on the fuel pump had fractured and was replaced for the subsequent functional test of the engine. No anomalies with the mechanical fuel pump were evident except for the fractured fitting already mentioned.

Engine

The engine mounts were broken, but the engine remained in place and was strapped down for the functional test. A tear in the oil pan was found and was sealed using an epoxy compound for the functional test.

Prior to the functional test, the following steps were completed:

1. The upper spark plugs were removed and no anomalies were noted

2. The engine was examined with a lighted borescope and no anomalies noted

3. The engine was rotated and valve train and accessory gear continuity was confirmed

4. A compression check verified suction, compression and valve action on all cylinders. (The rocker arm covers had been removed for this check)

5. Magneto timing was checked and verified to be 22 degrees before top dead center (BTDC).

6. The fuel pump was reinstalled and plumbed to a fuel source. The fuel source contained fuel that was drained from the left wing tank at the accident site. The fuel source also had an air driven pump that was used to prime the engine for start up.

7. The propeller governor was removed and a block off plate installed on the engine mounting pad.

8. The spark plugs were reinstalled and spark plug wires connected.

9. The rocker covers were reinstalled.

10. The remaining 2 propeller blades were cut off to the same approximate length as the one that had been cut for transport.

After completing the above steps, the airplane was strapped to the trailer, and the engine also secured with a strap. The trailer was pulled out of the maintenance hangar and the trailer wheels blocked. A battery was connected to the engine starter using jumper cables to crank the engine. The engine started on the second attempt. The engine was run for about 2 to 3 minutes at various engine speeds. The engine idled and accelerated without anomaly or hesitation. No defects in engine operation were noted. Due to the shortened prop and broken engine mounts, the engine functional test was limited for safety reasons; however, no defects in operation were noted.

The airplane’s fuel flow instrument and engine analyzer were removed from the airplane for download of any data that may have been stored in non-volatile memory. The fuel flow instrument allowed the pilot to manually reset the “fuel used” parameter when fuel was added to the airplane. The data downloaded indicated that 267 gallons of fuel was used since the last reset. This exceeded the total fuel quantity that the airplane’s fuel tanks would hold, indicating that the parameter had not been reset. The engine analyzer stored data for exhaust gas temperature, cylinder head temperature and battery voltage. The recovered data showed a sharp decline in both exhaust gas temperature and cylinder head temperature during the accident flight. This decline in temperatures was indicative of a reduction in power; however no other data parameters were recorded that would that could aid in the investigation.

he mechanic that performed the most recent annual inspection of the airplane reported that the airplane was fueled with the maximum usable fuel quantity (44.5 gallons in each wing tank) in order to weigh the airplane for weight and balance purposes. There was no additional evidence provided by the pilot or owners indicating that fuel had been added to the airplane subsequent to the annual inspection. The airplane's recording hour meter indicated that the airplane had been operated for a total of 2.3 hours since the annual inspection. According to information provided by the airplane manufacturer, the recording hour meter records engine time based on engine RPM. At 2,500 rpm, the hour meter would record one hour for each hour of operation. At lower RPMs, the hour meter will record a proportionally lower amount of time for each hour of operation. For example, at 1,250 RPM, the hour meter would record 0.5 hours for each hour of operation at that RPM level.

The engine manufacturer provided fuel system adjustment information that indicated at full rich mixture the engine would burn between 21.3 and 22.1 gallons per hour at 2,500 RPM. The Pilot’s Operating Handbook/Airplane Flight Manual (AFM) listed best power fuel consumption at 75% power setting, 2,500 RPM, and leaned to 50 degrees rich of peak exhaust gas temperature of 16.0 gallons per hour. The AFM also listed best economy fuel consumption at 75% power setting, 2,500 RPM, and leaned to 50 degrees lean of peak exhaust gas temperature of 14.5 gallons per hour. Using this information, the endurance on a single tank (44.5 gallons usable) was calculated to be between 2.0 and 3.1 hours.