ASN Wikibase Occurrence # 213840
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| Date: | Monday 30 July 2018 |
| Time: | 10:44 |
| Type: |  Piper PA-60-602P Aerostar |
| Owner/operator: | Private |
| Registration: | C-GRRS |
| MSN: | 60-8265026 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 4856 hours |
| Engine model: | Lycoming TSI-540-U2A |
| Fatalities: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Greenville Municipal Airport, Piscataquis County, ME -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Pembroke and Area Airport, ON (YTA/CYTA) |
| Charlottetown Airport, PE (YYG/CYYG) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot of the multiengine airplane was in cruise flight at 23,000 ft mean sea level (msl) in day visual meteorological conditions when he reported to air traffic control that the airplane was losing altitude due to a loss of engine power. The controller provided vectors to a nearby airport; about 7 minutes later, the pilot reported the airport in sight and stated that he would enter a downwind leg for runway 14. By this time, the airplane had descended to about 3,200 ft above ground level. Radar data indicated that the airplane proceeded toward the runway but that it was about 400 ft above ground level on short final. The airplane flew directly over the airport at a low altitude before entering a left turn to a close downwind for runway 21. Witnesses stated that the airplane's propellers were turning, but they could not estimate engine power. When the airplane reached the approach end of runway 21, it entered a steep left turn and was flying slowly before the left wing suddenly "stalled" and the airplane pitched nose-down toward the ground.
Postaccident examination of the airplane and engines revealed no mechanical deficiencies that would have precluded normal operation at the time of impact. Examination of both propeller systems indicated power symmetry at the time of impact, with damage to both assemblies consistent with low or idle engine power. The onboard engine monitor recorded battery voltage, engine exhaust gas temperature, and cylinder head temperature for both engines. A review of the recorded data revealed that about 14 minutes before the accident, there was a jump followed by a decrease in exhaust gas temperature (EGT) and cylinder head temperature (CHT) for both engines. The temperatures decreased for about 9 minutes, during which time the right engine EGT data spiked twice. Both engines' EGT and CHT values then returned to normal, consistent with both engines producing power, for the remaining 5 minutes of data. It is possible that a fuel interruption may have caused the momentary increase in both engines' EGT and CHT values and prompted the pilot to report the engine power loss; however, the engine monitor did not record fuel pressure or fuel flow, and examination of the airplane's fuel system and engines did not reveal any mechanical anomalies. Therefore, the reason for the reported loss of engine power could not be determined.
It is likely that the pilot's initial approach for landing was too high, and he attempted to circle over the airport to lose altitude. While doing so, he exceeded the airplane's critical angle of attack while in a left turn and the airplane entered an aerodynamic stall at an altitude too low for recovery.
Probable Cause: The pilot's exceedance of the airplane's critical angle of attack while maneuvering to land, which resulted in an aerodynamic stall.
Accident investigation:
 |
|
Sources:
NTSB
https://flightaware.com/live/flight/CGRRS
Location
Images:
Photo: NTSB
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Jul-2018 20:38 | Geno | Added |
| 30-Jul-2018 22:09 | Iceman 29 | Updated [Source, Embed code, Damage] |
| 31-Jul-2018 16:37 | Iceman 29 | Updated [Source, Embed code, Narrative] |
| 18-Aug-2018 20:59 | Iceman 29 | Updated [Nature, Source, Narrative] |
| 26-May-2019 07:29 | Anon. | Updated [Departure airport, Destination airport] |
| 22-Apr-2020 17:03 | ASN Update Bot | Updated [Time, Operator, Source, Embed code, Narrative, Accident report, ] |
| 22-Apr-2020 17:55 | harro | Updated [Source, Embed code, Narrative, Photo, Accident report, ] |
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