GAA19CA132

NTSB accident investigation · Piper PA 18A · McGrath, AK · January 28, 2019

Accident · No injuriesData collectionFinal report
Date
January 27, 2019, 15:00 local (Jan 28, 2019, 00:00 UTC)
Place
McGrath, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N8170CPiper PA 18A
Defining event
Landing: Landing gear collapse
Weather
Visual (VMC) · Day
Status
Completed · report September 26, 2019
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20190127005779A
Case key
98962

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

On this page

Probable cause

The pilot's selection of unsuitable terrain for landing, which resulted in the landing gear collapsing.

Findings · 5

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.

Runway/land/takeoff/taxi surface: snow/slush/ice covered surfaceEnvironmental issues › Physical environment · Decision related to conditionPiper PA-18A: 1 caseAll aircraft: 219 casesProbable cause
Object/animal/substanceEnvironmental issues › Physical environment · Contributed to outcomePiper PA-18A: 1 caseAll aircraft: 224 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

The pilot of the ski-equipped airplane reported that, while landing off-airport on a snow-covered field, he side-loaded the landing gear on the left side against a large "tussock" hidden by the snow. The left landing gear folded under the airplane, which caused the left wingtip to drop into the snow and impact a snow-covered tussock. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Factual narrative

The pilot of the ski-equipped airplane reported that, while landing off-airport on a snow-covered field, he side loaded the landing gear on the left side against a large "tussock" hidden by the snow. The left landing gear folded under the airplane, causing the left wingtip to drop into the snow and impact a snow-covered tussock. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Aircraft

Registration
N8170C
Reported as
Piper PA 18A (135)
Category
Airplane
Serial number
18-3626
Built
1954
Airframe hours
415
Engine
Lycoming O-320 A2B, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · November 7, 2018
Departed
MCG · Mcgrath, AK
Destination
MCG · Mcgrath, AK
Flight plan
Company VFR
Equipment
Unknown

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
44
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
January 16, 2018
Seat
Front
Restraint
3-point
Flight hours
8,800 total · 7,600 in this make and model · 8,780 as pilot in command · 66 in the last 90 days · 32 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
130° at 7 knots
Visibility
10 statute miles
Lowest ceiling
11,000 ft overcast
Temperature
37 °F, dew point 27 °F
Altimeter
30.14 inHg
Observed at
PAMC, 26 nm away

Docket · 2

The files NTSB released with the investigation on March 14, 2019, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.5 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.