Piper PA-28-140 N8938C

Summary

On 5 August 2007 at about 16:45 local time, a Piper PA-28-140 registered N8938C was involved in an accident near S. Lake Tahoe, California, United States. 2 people were on board and one died, one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

5 August 2007 at 16:45

Classification

Accident

Location

S. Lake Tahoe, California, United States

Nearest airport

Lake Tahoe Airport (KTVL)

Coordinates

38.8725, -120.0033

Aircraft

Piper PA-28-140

Registration

N8938C

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Route

S. Lake Tahoe → Concord

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX07FA241

1 person died.

The pilot's inadequate preflight planning/decision, and his failure to maintain clearance from trees during takeoff-initial climb. Contributing to the accident were turbulence, downdrafts, and rising terrain.

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

Read the full NTSB narrative

The single engine airplane appeared to be returning to the airport shortly after takeoff when witnesses saw it descend into trees. The pilot radioed his intentions to perform a downwind departure from runway 18. Approximately 3 minutes later, the pilot made his final radio transmission, stating that he was turning left crosswind. Witnesses reported seeing the airplane in a right turn about 20 feet above the treetops, with a slightly nose low attitude. The airplane then rolled to a level attitude, heading in a northerly direction, and started to descend just prior to its collision with trees. Witnesses also reported hearing the engine at what they described as a high power setting initially, then it dropped to a lower sounding power setting just before the airplane contacted the trees. Postaccident inspection of the airframe and engine revealed no evidence of a mechanical failure or malfunction. The airport is located in a mountain valley with rising terrain immediately to the west, south, and east, and a lake to the north. The elevation is 6,264 feet. The winds were from the south at 16 knots gusting to 31. The density altitude was calculated to be 8,445 feet. Using the airplane's pilot operating handbook (POH) performance charts, the pilot could expect the airplane to be able to maintain a 220 foot per minute rate of climb at 89 miles per hour for this density altitude. The POH published stall speed for zero angle of bank and zero flaps is 55 miles per hour. Advisory Circular AC 00-57 states, "Aircraft that engage in low-level flight operations over mountainous terrain in the presence of strong winds (20 kt or greater at ridge level) can expect to encounter moderate or greater turbulence, strong up-and-downdrafts, and very strong rotor and shear zones." Information available at the airport states that downdrafts are often encountered near the runway abeam the terminal building and west of the golf course, which is along the crosswind and downwind routes for runway 18 departures. The pilot probably encountered turbulence and downdrafts, a reduced rate of climb, and rising terrain to his left shortly after takeoff. It is likely he elected to return to the airport for landing, but was unable to maintain altitude during the turn due to the turbulence/downdrafts, and collided with trees.

Quoted verbatim from the NTSB record.