WPR21LA172

NTSB accident investigation · Michael J Robbins Searey · Friday Harbor, WA · April 22, 2021

Accident · No injuriesClass 4 · LimitedFinal report
Date
April 21, 2021, 17:15 local (Apr 22, 2021, 00:15 UTC)
Place
Friday Harbor, WA · Off Airport
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N888MJMichael J Robbins Searey
Defining event
Takeoff: Loss of engine power (partial)
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Western Pacific Region
Parties
Federal Aviation Administration
FAA report
20210422006529A
Case key
102962

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

Partial loss of engine power due to the detachment of the throttle cable from the carburetor arm, as a result of the pilot’s inadequate maintenance which resulted in an off-airport landing and impact with vegetation.

Findings · 2

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.

Engine fuel and control: fuel control/carburetorAircraft › Aircraft power plant · Incorrect service/maintenanceMichael J Robbins SEAREY: 1 caseAll aircraft: 195 casesProbable cause
Maintenance: modification/alterationPersonnel issues › Task performance · Owner/builderMichael J Robbins SEAREY: 1 caseAll aircraft: 69 casesProbable cause

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 an experimental amphibian airplane reported that, during takeoff, about 200 ft above ground level, the engine experienced a reduction of power. The engine was running, but without sufficient power to maintain level flight. He elected to make an off-airport landing that resulted in an impact with vegetation and substantial damage to both wings. The pilot further reported that, the right throttle cable had pulled loose from the carburetor arm on takeoff and the spring pulled the throttle arm to the idle position, which resulted in a partial loss of engine power. According to the pilot, he had reinstalled the carburetor opposite to how it came from the manufacturer. According to the manufacturer, the carburetor is installed with the throttle lever spring positioned in such a manner that if the throttle cable breaks, the throttle lever spring will move to the FULLY OPEN position (full power). There were no other preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Aircraft

Registration
N888MJ
Reported as
Michael J Robbins Searey
Category
Airplane, amateur-built
Serial number
1DK462C
Built
2016
Airframe hours
439
Engine
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · June 3, 2020 · 77 hours before
Destination
PAE · Everett, WA
Airport
FHR · Friday Harbor Airport
Equipment
Electronic primary flight display, ADS-B

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
76
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Single-engine sea, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Last flight review
June 18, 2020
Seat
Left
Restraint
5-point
Flight hours
3,964 total · 439 in this make and model · 3,715 as pilot in command · 26 in the last 90 days · 17 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
230° at 5 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
61 °F, dew point 46 °F
Altimeter
29.99 inHg
Observed at
KFHR
METAR
METAR KFHR 212353Z AUTO 23005KT 10SM CLR 16/08 A2999 RMK AO2 SLP156 T01610083 10189 20139 56019 TSNO=

Docket · 5

The files NTSB released with the investigation on December 9, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 4.0 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.