ANC98LA108

NTSB accident investigation · Cessna 206 · Anchorage, AK · July 23, 1998

Accident · Minor injuriesLimited investigationFinal report
Date
July 23, 1998, 14:32 local (22:32 UTC)
Place
Anchorage, AK
Injuries
1 minor, 1 uninjured
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N206FCessna 206
Weather
Visual (VMC) · Day
Status
Completed · report July 28, 1999
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19980723016989A
Case key
43541

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's delay in aborting the takeoff prior to reaching the end of the lake. A factor associated with the accident was a downdraft.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight encounter with weatherTakeoff - initial climb
Weather condition - downdraftFactor
Aborted takeoff - delayedPilot in commandCause
In flight collision with objectTakeoff - initial climb
Object - tree(s)
Object - vehicle

Analysis

The pilot was departing from a lake. He stated that, once airborne, the airplane would not climb. As the airplane neared the end of the lake, the pilot said that the airplane would not maintain altitude, forcing him to land on a road in a housing development adjacent to the departure end of the lake. The pilot said: 'I just hit a downdraft at the end of the lake. I just couldn't climb out.' The pilot noted that there were no preaccident mechanical anomalies with the airplane, and that the engine was producing sufficient power. During the landing, the airplane struck a tree and a pickup truck with two occupants inside. The two occupants of the pickup truck were not injured. The pilot said the wind conditions at the time of the accident were from the southeast at 10 knots, with peak gusts to 15 knots.

Factual narrative

On July 23, 1998, about 1432 Alaska daylight time, a float equipped Cessna 206 airplane, N206F, sustained substantial damage during takeoff from Campbell Lake, Anchorage, Alaska. The airplane was being operated as a visual flight rules (VFR) personal flight under Title 14, CFR Part 91, when the accident occurred. The certificated airline transport pilot was not injured. The pilot-rated passenger aboard received minor injuries. Visual meteorological conditions prevailed, and no flight plan was filed. The flight was en route to Telequana Lake, Alaska.

During an on scene interview with the National Transportation Safety Board investigator-in-charge, on July 23, the pilot reported that he started the takeoff run with 10 degrees of flaps, and once on the step, he extended the flaps to 20 degrees. He stated that once airborne, the airplane would not climb. As the airplane neared the end of the lake, the pilot said that the airplane would not maintain altitude, forcing him to land on a road in a housing development adjacent to the departure end of the lake. During the interview the pilot said: "I just hit a downdraft at the end of the lake. I just couldn't climb out." The pilot noted that there were no preaccident mechanical anomalies with the airplane, and that the engine was producing sufficient power.

During the landing, the airplane struck a tree and a pickup truck with two occupants inside. The two occupants of the pickup truck were not injured.

The pilot stated the wind conditions at the time of the accident were from the southeast at 10 knots, with peak gusts to 15 knots.

Aircraft

Registration
N206F
Reported as
Cessna 206
Category
Airplane
Serial number
2063015
Airframe hours
6,421
Engine
Continental IO-520-F, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Michael Patrick Murphy
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 25, 1998
Destination
Port Alsworth, AK
Airport
L-1A · Campbell Lake

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
37
Certificates
Flight engineer, Commercial, Flight instructor, Airline transport
Airplane ratings
Single-engine land, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
15,000 total · 650 in this make and model · 12,500 as pilot in command · 300 in the last 90 days · 100 in the last 30 days · 10 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
130° at 10 knots, gusting 15
Visibility
15 statute miles
Lowest ceiling
None
Temperature
68 °F
Altimeter
29.00 inHg

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.