ANC07TA080

NTSB accident investigation · Piper PA-18 · McGrath, AK · August 11, 2007

Accident · No injuriesFinal report
Date
August 11, 2007, 13:30 local (21:30 UTC)
Place
McGrath, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N7051Piper PA-18
Weather
Visual (VMC) · Day
Status
Completed · report April 30, 2008
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Federal Aviation Administration
FAA report
20070811022679A
Case key
66433

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 NTSB’s determination of the probable cause, and any contributing factors.

The pilot's failure to maintain control of the airplane during the landing roll. Contributing to the accident was rough and uneven terrain conditions.

Analysis

An Alaska State Trooper pilot was landing a tundra-tire equipped airplane on a 1,500-foot long rough gravel site. During the landing roll, the pilot said he applied the brakes and pushed the elevator control stick forward in an attempt to dampen the effects of the rough terrain. In his written statement to the NTSB, the pilot wrote, in part: "Too much forward stick was applied, causing the aircraft to roll onto its nose, striking the prop and spinner and eventually coming to rest upside-down." The airplane sustained substantial damage to the vertical stabilizer and right wing. The pilot said that there were no preaccident mechanical problems with the airplane.

Factual narrative

On August 11, 2007, about 1330 Alaska daylight time, a tundra tire-equipped Piper PA-18 airplane, N7051, sustained substantial damage when it nosed over during the landing roll at an off-airport site, about 58 miles southwest of McGrath, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country government-operated flight under Title 14, CFR Part 91, when the accident occurred. The State of Alaska, Department of Public Safety, Fish and Wildlife Service, operated the airplane. The sole occupant, an Alaska State Trooper who held a private pilot certificate, was not injured. Visual meteorological conditions prevailed, and company flight following procedures were in effect.

According to the pilot's written statement included in the NTSB Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) submitted by the operator, the pilot reported that he was landing at a 1,500-foot long gavel-covered site, at the conclusion of a routine aerial game patrol. The pilot stated that during the landing roll, he applied the airplane's brakes in conjunction with moving the elevator control stick forward, in an attempt to dampen the effects of the rough and uneven terrain. The pilot wrote, in part: "Too much forward stick was applied, causing the aircraft to roll onto its nose, striking the prop and spinner and eventually coming to rest upside-down." The airplane sustained substantial damage to the vertical stabilizer and right wing. The pilot indicated that there were no preaccident mechanical anomalies with the airplane.

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.

Nose overLanding - roll
Aircraft control - not maintainedPilot in commandCause
Terrain condition - rough/unevenFactor

Aircraft

Registration
N7051
Reported as
Piper PA-18
Category
Airplane
Serial number
18-2932
Airframe hours
13,449.1
Engine
Lycoming O-320-B2B, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Public aircraft - state · Part 91
Registered owner
State of Alaska, Department of Public Safety
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · June 1, 2007 · 34.3 hours before
Departed
McGrath, AK
Destination
Farewell, AK
Flight plan
Company VFR

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
39
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Last flight review
March 1, 2007
Seat
Front
Flight hours
412 total · 118 in this make and model · 369 as pilot in command · 57 in the last 90 days · 13 in the last 30 days · 6 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
70 °F

FAA reports on this event · 1

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

Other investigations on N7051 · 4

Matched to the same aircraft by N-number and date.