# Incident 19990625022239I: Diamon DA20C1, Lake Alamo, AZ, June 25, 1999

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: June 25, 1999, 16:00 local time
- Place: Lake Alamo, AZ
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: General operating rules (Part 91)
- Aircraft: N953CT, registered now (https://openairdocs.org/aircraft/N953CT) (OpenAirDocs)
- Registry model: Diamond Aircraft Ind DA20-C1 (registry code 2990001, https://openairdocs.org/model/diamond-aircraft-ind-da20-c1) (OpenAirDocs)
- Registry engine: Continental IO-200 (registry code 17021, https://openairdocs.org/engine/continental-io-200) (OpenAirDocs)
- Reported make and model: DIAMON DA20C1
- Reported engine: CONT IO240B
- People aboard: 1
- Fatal injuries: 0
- Pilot flight hours: 570 total, 20 in this make and model, 80 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19990625022239I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

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.

- [Incident 20010802020199I](https://openairdocs.org/incident/20010802020199I), Aug 2, 2001: Diamon DA20C1 (N953CT), Marana, AZ, Minor damage. (-23) Aircraft propeller departed the aircraft during climb out after departure from the airport. Pilot reported that he felt a sudden vibration while in the…
- [Incident 20010119006299I](https://openairdocs.org/incident/20010119006299I), Jan 19, 2001: Diamon DA20C1 (N953CT), Glendale, AZ, Minor damage. (-23) Pilot reported that he ballooned on an attempted landing, then made a hard full stall landing. The pilot made a go-around and then landed the a/c and…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft 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. For accidents, the NTSB's own investigation is the fuller record.

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