ASN Aircraft accident Learjet 25 N70SK St. Augustine Airport, FL (UST)
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Status:Accident investigation report completed and information captured
Date:Saturday 21 July 2007
Type:Silhouette image of generic LJ25 model; specific model in this crash may look slightly different
Learjet 25
Operator:SK Logistics
Registration: N70SK
MSN: 25-049
First flight: 1970
Total airframe hrs:15812
Engines: 2 General Electric CJ610-6
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 2
Aircraft damage: Damaged beyond repair
Location:St. Augustine Airport, FL (UST) (   United States of America)
Phase: Landing (LDG)
Departure airport:Gainesville-J R Alison Municipal Airport, FL (GNV/KGNV), United States of America
Destination airport:St. Augustine Airport, FL (UST/KSGJ), United States of America
About 5 miles from the destination airport, the flight was cleared by air traffic control to descend from its cruise altitude of 5,000 feet for a visual approach. As the first officer reduced engine power, both engines "quit." The captain attempted to restart both engines without success. He then took control of the airplane, and instructed the first officer to contact air traffic control and advise them that the airplane had experienced a "dual flameout." The captain configured the airplane by extending the landing gear and flaps and subsequently landed the airplane on the runway "hard," resulting in substantial damage to the airframe. Both engines were test run following the accident at full and idle power with no anomalies noted.
Examination of the airplane revealed that it was equipped with an aftermarket throttle quadrant, and that the power lever locking mechanism pins as well as the throttle quadrant idle stops for both engines were worn. The power lever locking mechanism internal springs for both the left and right power levers were worn and broken. Additionally, it was possible to repeatedly move the left engine's power lever directly into cutoff without first releasing its power lever locking mechanism; however, the right engine's power lever could not be moved to the cut off position without first releasing its associated locking mechanism. The right throttle thrust reverser solenoid installed on the airplane was found to be non-functional, but it is not believed that this component contributed to the accident. No explicit inspection or repair instructions were available for the throttle quadrant assembly. Other than the throttle quadrant issues, no other issues were identified with either the engines or airframe that could be contributed to both engines losing power simultaneously.

Probable Cause:

PROBABLE CAUSE: "A loss of power on both engines for an undetermined reason."

Accident investigation:

Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Accident number: NYC07LA170
Download report: Summary report

Cause undetermined
All engine powerloss
Runway mishap



photo of Learjet-25-N70SK
accident date: 21-07-2007
type: Learjet 25
registration: N70SK

This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Gainesville-J R Alison Municipal Airport, FL to St. Augustine Airport, FL as the crow flies is 94 km (59 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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