Cessna 182C N8717T

Summary

On 9 August 2011 at about 23:14 local time, a Cessna 182C registered N8717T, operated by Fly High Aviation, was involved in an accident near Boulder, Colorado, United States. One person was on board and one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

9 August 2011 at 23:14

Classification

Accident

Location

Boulder, Colorado, United States

Coordinates

40.0203, -105.2504

Aircraft

Cessna 182C

Registration

N8717T

Category

Airplane

Year built

1960

Engines

1

Operator

Fly High Aviation

Operating rule

Part 91: General Aviation

Purpose of flight

Skydiving

Phase of flight

Not recorded

Route

Boulder → Boulder

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN11FA559

1 person had minor injuries.

The malfunction of the throttle linkage to the induction air box, which resulted in a loss of engine power and subsequent forced landing.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

After two parachutists jumped from the airplane, the pilot began a descent and applied carburetor heat. The pilot reduced power for a straight-in approach while the airplane was passing through 9,000 feet mean sea level and about 3 miles from the destination airport. She then attempted to add power to adjust the descent rate, but the engine did not respond. The pilot then fully reduced the engine power then tried to advance the throttle with no response. After performing the power loss checklist, she continued toward the runway but, after encountering a downdraft, she chose to conduct a forced landing to an open field. Upon touchdown, the airplane collided with trees at the edge of the field. The propeller assembly was found attached to the engine hub, and both blades were straight with little damage consistent with them not being powered at the time of impact. About 5 gallons of fuel were drained from the left fuel tank and about 0.5 gallon was drained from the right fuel tank. The fuel selector was found in the "both" position. Because of the fuel leakage due to impact damage, it was not possible to determine exactly how much fuel was onboard at the time of the accident; however, enough fuel was present in the lines to determine that fuel starvation did not occur. No evidence of debris, obstructions, or water contamination was identified in the fuel gascolator. About 8.5 quarts of oil were found in the engine. Some oil residue was found on the belly skin of the airplane and was identified to have originated from an aftermarket oil drain installation. The front underside of the airframe was damaged and pushed upward underneath the engine compartment near the air induction box. When moved by hand, the throttle linkage to the air induction box did not move smoothly and was stiff. The throttle linkage to the induction box was adjusted, and the engine was test run while still in the airframe mounts. It started normally and ran at various power settings with no anomalies noted. Throughout the engine test run, the engine accelerated normally. A magneto rpm drop check was normal. The damage underneath the engine compartment near the box precluded a determination of whether the throttle linkage anomaly was present before impact. However, given that the engine ran normally after the throttle linkage adjustment, it is likely that the throttle linkage anomaly did occur before impact and contributed to the loss of engine power.

Quoted verbatim from the NTSB record.