ANC14LA065

NTSB accident investigation · Terry W. Thayer Zenith Stol CH701 · Nikiski, AK · August 18, 2014

Accident · No injuriesLimited investigationFinal report
Date
August 18, 2014, 13:30 local (21:30 UTC)
Place
Nikiski, AK
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N957TTTerry W. Thayer Zenith Stol CH701
Defining event
Takeoff: Fuel starvation
Weather
Visual (VMC) · Day
Status
Completed · report February 11, 2015
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Federal Aviation Administration, FSDO-03
FAA report
20140818016649A
Case key
89909

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 improper positioning of the fuel selector valves, which resulted in a loss of engine power due to fuel starvation. Contributing to the accident was the pilot’s failure to follow preflight checklists.

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.

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 reported that he was departing from a remote, off-airport site in an experimental amateur-built airplane. He stated that just after takeoff, as the airplane reached about 50 feet above ground level, the engine lost all power. The pilot then attempted to land the airplane near the departure end of the site, but, with insufficient airspeed or altitude to transition to a landing attitude, the airplane landed hard and sustained substantial damage to the wings and fuselage. According to the pilot, he had turned the airplane's fuel valves to the "off" position after the previous landing, and he failed to move the fuel valves into the "on" position before departure. He also noted that he did not use the preflight checklist. The pilot stated that there were no preaccident mechanical anomalies with the airplane that would have precluded normal operation.

Factual narrative

On August 18, 2014, about 1330 Alaska daylight time, an experimental amateur built Zenith STOL CH-701 airplane, N957TT, sustained substantial damage during a collision with terrain, following a loss of engine power during takeoff from an off-airport site near Nikiski, Alaska. The airplane was registered to and operated by the pilot as a visual flight rules (VFR) personal flight under the provisions of 14 Code of Federal Regulations Part 91. The pilot, who was the sole occupant, was not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the flight destined to Nikishka, Alaska. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on August 21, the pilot stated that before landing at the off-airport site he performed a low pass to observe the condition of the site and noted three areas of standing water and one aircraft parked off the site. He then conducted a touch-and-go landing, touching down with the main gear only to test the landing surface, followed by a full stop landing. During the landing roll, the airplane's main landing gear wheels went through areas of standing water, which splashed over the windscreen and under the pilot's door. Upon exiting the airplane the pilot noticed fluid dripping from underneath the wing. He believed it was fuel, as he had a fuel leak in the same location the month prior, so he closed both fuel valves. The pilot reported that before departing for his return trip, he performed a walk-around inspection of the airplane and the airstrip, and noted no abnormalities. He added that he started the engine and did the before-takeoff procedures by memory, without the use the preflight checklist. The pilot said that during takeoff, as the airplane climbed to about 50 feet above the ground (agl), the engine lost all power. The pilot stated he had insufficient airspeed or altitude to transition to a landing attitude which resulted in a hard landing near the departure end of the site. The airplane sustained substantial damage to the fuselage and both wings detached at the rear attachment point. In the pilot's written statement dated August 22, 2014, which was included in the NTSB Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) the pilot stated that he had failed to move the fuel valves into the "on" position prior to engine start, which resulted in fuel starvation and a total loss of power after takeoff. The pilot also reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. The pilot noted in the recommendation section of the Form 6120.1 that the accident could have been prevented if he used the checklists and avoided distractions while completing the checklists.

Aircraft

Registration
N957TT
Reported as
Terry W. Thayer Zenith Stol CH701
Category
Airplane, amateur-built
Serial number
7-7355
Built
2011
Airframe hours
60.6
Engine
Rotax 912 ULS, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · June 2, 2014
Departed
AK73 · Nikiski, AK
Destination
AK73 · Nikiski, 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 2, With waivers/limitations
Seat
Left
Restraint
4-point
Flight hours
147.6 total · 69 in this make and model · 76.1 as pilot in command · 14.1 in the last 90 days · 2 in the last 30 days · 0 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
210° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
57 °F, dew point 52 °F
Altimeter
29.88 inHg
Observed at
PAEN, 17 nm away

Docket · 1

The files NTSB released with the investigation on January 8, 2015, on NTSB’s docket system: statements, records, photos and specialists’ reports. 644 KB 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.