Accident Helio H-800 Courier N666X, 26 Feb 1999
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ASN Wikibase Occurrence # 201948
 
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Date:26-FEB-1999
Time:11:57
Type:Silhouette image of generic COUR model; specific model in this crash may look slightly different    
Helio H-800 Courier
Owner/operator:Helio Enterprises
Registration: N666X
MSN: H 22
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Prescott, AZ -   United States of America
Phase: Unknown
Nature:Unknown
Departure airport:PRC
Destination airport:
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The airplane sustained a hard landing after the propeller went into an uncommanded reverse pitch range on final approach. This was the first flight with this engine installed. After several successful normal approaches and landings flown at 70 knots, the pilot decided to make a more aggressive STOL (short takeoff and landing) approach. This would require him to fly about 60 knots and required more precise power control. Shortly after turning from the base leg to final, the propeller went uncommanded into the beta (reverse pitch) range. At an altitude of 150 feet he didn't think he could lower the nose and attain the 70-knot airspeed he needed to flare normally. He elected to maintain his three-point attitude and tried to slightly increase power to get the propeller to come out of beta. Normally, beta is obtained by depressing a thumb lever that lifts a pin, allowing the control lever to be moved into the beta range. He detected no response so he continued to slowly advance the power. The airplane touched down at approximately 1,000-feet-per-minute rate of descent. The Federal Aviation Administration accident coordinator examined the airplane, engine, and documentation. The proper technical manuals were available and the installation appeared to comply with the manuals. He did not observe any mechanical damage to the controls or linkages that controlled the propeller. All linkages and jam nuts were secured and the linkages appeared to be properly adjusted.
Probable Cause: The malfunction of the propeller for undetermined reasons at an altitude too low for the pilot to take effective remedial action.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001205X00195&key=1


Revision history:

Date/timeContributorUpdates
26-Nov-2017 09:59 ASN Update Bot Added

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