Mechanical & Engine Failure · NTSB WPR19FA178
Maule M7-235B — Sunriver, OR
| Date | June 22, 2019 |
| Location | Sunriver, OR |
| Aircraft | Maule M7-235B |
| Purpose of flight | Personal |
| Conditions | Day · Visual Meteorological Cond |
| Phase / occurrence | Initial climb Loss of engine power (partial) |
| Pilot age | 63 |
| Pilot total time | 7,080 hrs · High time |
| Time in type | 73 hrs |
| Fatalities | 1 |
Probable cause
NTSB findings
- Aircraft-Aircraft power plant-Engine exhaust-(general)-Damaged/degraded - C
- Personnel issues-Action/decision-Action-Forgotten action/omission-Pilot - F
- Aircraft-Aircraft systems-Landing gear system-Wheel/ski/float-Incorrect use/operation
- Environmental issues-Physical environment-Terrain-Water-Contributed to outcome
What happened
The pilot and passenger departed on a local flight in the amphibious airplane from a paved runway. The passenger described the airplane's rate of climb after takeoff as "slow" and stated that it was apparent that the airplane would not clear the 50-ft-tall trees ahead. A witness described the airplane as "struggling to gain altitude" and noticed a "definite power loss." The pilot performed a forced landing to a river, where the airplane immediately nosed over and began filling with water. The landing gear was found in the extended position and the water rudders were retracted. The landing gear position indicators were operational and also indicated that the landing gear was extended. The position of the landing gear likely resulted in the airplane nosing over upon impact with the water.
Examination of the engine revealed that the muffler baffles had broken at the weld point. The left muffler baffling moved freely inside of the muffler. The right muffler baffling was turned 180° and was obstructing the exhaust outlet. A test run of the engine with the mufflers installed was unsuccessful; however, upon removal of the mufflers, the engine performed with no anomalies. There is no requirement to check the inside of a muffler during annual or 100-hour inspections to ensure that the baffling is intact. It could not be determined as to how long these mufflers had been in this condition. It is likely that the airflow restriction of the separated baffling resulted in a partial loss of engine power and the airplane's subsequent inability to climb after takeoff.