ANC14CA066

NTSB accident investigation · Piper PA 18-150 · Skwentna, AK · August 16, 2014

Accident · No injuriesData collectionFinal report
Date
August 16, 2014, 11:00 local (19:00 UTC)
Place
Skwentna, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N83422Piper PA 18-150
Defining event
Landing-flare/touchdown: Landing area undershoot
Weather
Visual (VMC) · Day
Status
Completed · report November 13, 2014
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA/FSDO
FAA report
20140816015489A
Case key
89929

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 failure to maintain the proper approach path for landing, and his delayed remedial action, which resulted in an undershoot and collision with terrain.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: descent/approach/glide pathAircraft › Aircraft oper/perf/capability · Not attained/maintainedPiper PA-18-150: 8 casesAll aircraft: 809 casesProbable cause
Action: delayed actionPersonnel issues › Action/decision · PilotPiper PA-18-150: 11 casesAll aircraft: 894 casesProbable cause
Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotPiper PA-18-150: 160 casesAll aircraft: 9,295 casesProbable cause
Runway/land/takeoff/taxi surfaceEnvironmental issues › Physical environment · Contributed to outcomePiper PA-18-150: 11 casesAll aircraft: 253 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

During a flight to go fishing on a river, two of the three planned landing strips the pilot was going to land on were covered with water. The third had fog present. As a result the pilot looked for an alternate place to land and discovered a gravel bar in the river which looked to be about 800 feet long. He flew several passes over the gravel bar to assess its condition and then decided to land. During the landing flare, he noticed that the airplane was below the edge of the gravel. He added power to try and clear the edge, but the airplane touched down on a 1 to 2 foot long muddy, downwash area that existed just prior to the gravel bar, and the left main landing gear then struck the gravel bar's edge. Examination of the airplane revealed that it had incurred substantial damage to the airframe. The pilot reported there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.

Factual narrative

During a flight to go fishing on a river, two of the three planned landing strips the pilot was going to land on were covered with water. The third had fog present. As a result the pilot looked for an alternate place to land and discovered a gravel bar in the river which looked to be about 800 feet long. He flew several passes over the gravel bar to assess its condition and then decided to land. During the landing flare, he noticed that the airplane was below the edge of the gravel. He added power to try and clear the edge, but the airplane touched down on a 1 to 2 foot long muddy, downwash area that existed just prior to the gravel bar, and the left main landing gear then struck the gravel bar's edge. Examination of the airplane revealed that it had incurred substantial damage to the airframe. The pilot reported there were no preaccident mechanical malfunctions or anomalies that would have precluded normal operation.

Aircraft

Registration
N83422
Reported as
Piper PA 18-150
Category
Airplane
Serial number
18-7609127
Built
1976
Airframe hours
247
Engine
Lycoming O-360, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 6, 2013 · 30 hours before
Departed
AMR · Anchorage, AK
Destination
Skwentna, AK

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
56
Injuries
None
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Medical
Class 3, With waivers/limitations
Last flight review
June 27, 2013
Seat
Front
Restraint
4-point
Flight hours
868 total · 515 in this make and model · 731 as pilot in command · 41 in the last 90 days · 10 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
3,000 ft overcast
Temperature
52 °F, dew point 52 °F
Altimeter
29.70 inHg

Docket · 6

The files NTSB released with the investigation on November 5, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 5.7 MB in all.

FAA reports on this event · 1

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