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20150917018479I

Incident · No damage
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FAA incident report · Cessna TU206G · Madison, ME · September 17, 2015

FAA Aviation Safety Information Portal

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Date
September 17, 2015 · 09:15 local
Place
Madison, ME
Airport
Wesserunsett Lake
Phase of flight
Cruise/Level Flight
Operating rules
General operating rules (Part 91)
Damage
No damage
Aircraft
N9851Z
Reported as
Cessna TU206G
Reported engine
Continental TSIO-520 series
People aboard
3
Fatal injuries
0
Other injuries
0
Pilot’s certificates
Airline transport, commercial pilot, flight instructor
Pilot’s flight hours
3,257 total200 in this make and model35 in the last 90 days

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Early on 9/17/2015, Cessna N9851Z, TU206G, s/n U20606701 (on amphibious floats) was in cruise at 5500 ft. near Madison, Maine, when they experienced an engine problem. Pilot initially noticed a partial loss of power with reduced manifold pressure. The engine oil pressure dropped off to zero and then the engine failed. He declared an emergency on 121.5 and made a successful emergency landing on lake Wesserunsett. Three people onboard, no injuries and no damage to the aircraft. The left lower fuselage was covered with oil. Initial removal of the engine cowl revealed a hole in the top of the left crankcase half, indicating a connecting rod failure.

During the subsequent removal of the engine, the mechanic (privacy data omitted) found the braided steel flex oil line (p/n AE7010000E0310), was damaged and leaking between the engine oil pump and the turbo charger. It appears that all the engine oil was pumped out through the damaged oil line which eventually led to the connecting rod failure.

This Continental engine, model tsio 520 M8B, s/n 825658R has only 680 hours of operation since a factory remanufacture in November of 2004.

As the FAA filed it

EARLY ON 9/17/2015, CESSNA N9851Z, TU206G, S/N U20606701 (ON AMPHIBIOUS FLOATS) WAS IN CRUISE AT 5500 FT. NEAR MADISON, MAINE, WHEN THEY EXPERIENCED AN ENGINE PROBLEM. PILOT INITIALLY NOTICED A PARTIAL LOSS OF POWER WITH REDUCED MANIFOLD PRESSURE. THE ENGINE OIL PRESSURE DROPPED OFF TO ZERO AND THEN THE ENGINE FAILED. HE DECLARED AN EMERGENCY ON 121.5 AND MADE A SUCCESSFUL EMERGENCY LANDING ON LAKE WESSERUNSETT. THREE PEOPLE ONBOARD, NO INJURIES AND NO DAMAGE TO THE AIRCRAFT. THE LEFT LOWER FUSELAGE WAS COVERED WITH OIL. INITIAL REMOVAL OF THE ENGINE COWL REVEALED A HOLE IN THE TOP OF THE LEFT CRANKCASE HALF, INDICATING A CONNECTING ROD FAILURE.

DURING THE SUBSEQUENT REMOVAL OF THE ENGINE, THE MECHANIC (^PRIVACY DATA OMITTED^) FOUND THE BRAIDED STEEL FLEX OIL LINE (P/N AE7010000E0310), WAS DAMAGED AND LEAKING BETWEEN THE ENGINE OIL PUMP AND THE TURBO CHARGER. IT APPEARS THAT ALL THE ENGINE OIL WAS PUMPED OUT THROUGH THE DAMAGED OIL LINE WHICH EVENTUALLY LED TO THE CONNECTING ROD FAILURE.

THIS CONTINENTAL ENGINE, MODEL TSIO 520 M8B, S/N 825658R HAS ONLY 680 HOURS OF OPERATION SINCE A FACTORY REMANUFACTURE IN NOVEMBER OF 2004.