19990625022239I

Incident

FAA incident report · Diamon DA20-C1 · Lake Alamo, AZ · June 25, 1999

Date
June 25, 1999 · 16:00 local
Place
Lake Alamo, AZ
Phase of flight
Fcd/Prec Ldg From Cruise
Operating rules
General operating rules (Part 91)
Aircraft
N953CT
Reported as
Diamon DA20C1
Reported engine
Continental IO240B
People aboard
1
Fatal injuries
0
Pilot’s flight hours
570 total20 in this make and model80 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.

While cruising @ 9500' AGL the pilot notice an engine/prop vibration @ 2400 RPM and reduced the power to 2000 RPM. When the vibration continued, the pilot shut-down the engine. With the prop windmilling the vibration still continued and at approx. 4500' AGL the prop separated from the engine, clean without causing any significant damage to the rest of the aircraft. The pilot "dead-stick" landed, uneventfully on a dirt road near Lake Alamo, Arizona. The pilot was not hurt nor was there any post emergency landing fire. The sudden chg. In operational environment caused the six (6) propeller rentention bolts to lose their torque valve and eventually break. This is a wooden propeller.

As the FAA filed it

WHILE CRUISING @ 9500' AGL THE PILOT NOTICE AN ENGINE/PROP VIBRATION @ 2400 RPM AND REDUCED THE POWER TO 2000 RPM. WHEN THE VIBRATION CONTINUED, THE PILOT SHUT-DOWN THE ENGINE. WITH THE PROP WINDMILLING THE VIBRATION STILL CONTINUED AND AT APPROX. 4500' AGL THE PROP SEPARATED FROM THE ENGINE, CLEAN WITHOUT CAUSING ANY SIGNIFICANT DAMAGE TO THE REST OF THE AIRCRAFT. THE PILOT "DEAD-STICK" LANDED, UNEVENTFULLY ON A DIRT ROAD NEAR LAKE ALAMO, ARIZONA. THE PILOT WAS NOT HURT NOR WAS THERE ANY POST EMERGENCY LANDING FIRE. THE SUDDEN CHG. IN OPERATIONAL ENVIRONMENT CAUSED THE SIX (6) PROPELLER RENTENTION BOLTS TO LOSE THEIR TORQUE VALVE AND EVENTUALLY BREAK. THIS IS A WOODEN PROPELLER.

Other reports on N953CT · 2

Matched to the same aircraft by N-number and date.