CESSNA 180 near Boulder, UT — 2016-03-13

Probable cause

The pilot's failure to abort the takeoff from the soft runway surface, which precluded optimal acceleration during the takeoff sequence.

NTSB narrative

The private pilot reported that, during the takeoff run from the 2,100-ft-long soft, unimproved dirt airstrip, he observed that the propeller rpm was 2,600; he did not observe the manifold pressure reading. The pilot reported that the airplane seemed to accelerate slowly, which he thought was likely due to the soft runway surface or vegetation. About halfway to two-thirds down the runway, as the tail was coming off the ground, the pilot added a notch of flaps as the airplane continued to roll on its main landing gear. As the airplane approached the end of the runway, the pilot pulled back on the control yoke, which increased the angle of attack. The airplane then climbed about 2 ft above the ground before settling into sagebrush off the end of the runway. The airplane subsequently impacted a tree and came to rest upright about 50 yards from the tree. The pilot stated that he thought the engine might not have been producing full power and that he should have aborted the takeoff at that time. However, a postaccident examination of the airframe and engine, which included two engine test runs, did not reveal any anomalies that would have precluded normal operation. If the pilot had chosen to abort the takeoff when he noted that he airplane was accelerating slowly, the accident likely would have not occurred.

Analysis

Primary failure mode

Engine power loss

First missed decision gate

Pilot could have aborted the takeoff when he suspected engine was not generating full power.

NTSB coding

• Runway excursion · Takeoff

Evidence available

• 6 docket documents

Docket documents6

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Release of Aircraft Wreckage, NTSB Form 6120.15form
• Statement of Party Representatives to NTSB Investigationinterview
• Continental Motors Inc. - Engine Examinationother
• Pilot Submissionother
• Weather Dataother

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