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GAA16CA141 · Maule M 4 220C

13 Feb 2016 · Anchorage, AK, United States

Adventure Flight Maule M 4 220C · Accident: runway excursion during takeoff

From Merrill Field (PAMR) to Lake Hood Seaplane Base (LHD)

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Event

NTSB case
GAA16CA141
Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
Accident
InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
Completed
API-reported fatalities
0 · all aircraft and ground
Ground fatalities
Unknown
OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
General aviation
WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
Visual Meteorological Cond

Maule M 4 220C

Aircraft type
Maule M-4
Category
Airplane
RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
N2032U
Onboard fatalities
Unknown
Route
From Merrill Field (PAMR), Anchorage, AKTo Lake Hood Seaplane Base (LHD), Anchorage, AK
Aircraft age
About 47 years (built 1969)
Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
Part 91: General Aviation
Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
Takeoff
Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
Runway excursion
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Substantial

Cause areas

  • Aircraft › Aircraft oper/perf/capability
  • Personnel issues › Action/decision

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

According to the airline transport pilot, during the takeoff roll the airplane briefly exited the runway to the left after the passenger inadvertently pushed the left rudder pedal. While correcting for the runway excursion, the right main landing gear struck a taxiway sign, as the pilot controlled the airplane back on to the runway. The pilot and passenger reported that they did not observe any damage from their cockpit seats, and continued the takeoff roll and departure. The pilot reported that after reaching their destination, during the touchdown roll he noticed the right main landing gear tire deflated and affirmed that "the right wheel dug in and threw up debris that damaged the right elevator." However, photographs taken at the departure airport depict a taxiway sign with blue paint and metallic particle transfer on the sign which appears to be the same blue color as the accident airplane. Further the photographs show damage to the sign consistent with the damage to the airplane's elevator. There were impact impressions on the taxiway sign's black metal frame that were consistent with the damage sustained to the right side of the airplane's elevator.

The pilot reported that he used duct tape to make repairs to the airplane, took off and landed at their final destination airport without further incident. The airplane sustained substantial damage to the elevator.

The pilot reported that there were no mechanical failures or anomalies with the airplane prior to departure or during the flight that would have prevented normal flight operation.

Probable cause

The inadvertent rudder input by the passenger, resulting in a runway excursion during takeoff and collision with a taxiway sign.

Verbatim NTSB analysis and probable cause from the NTSB dataset

Sources

NTSB record GAA16CA141
Event ID
20160301X54319
Case number
GAA16CA141
Dataset
full-current
Source SHA-256
5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
  • Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
  • Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
  • The date is the local date, which is the same as the UTC date the NTSB stores.
  • API snapshot SHA-256: 024c472f347ffcfbb4bdd328b4edd259b831da52a01accb6409bf41fa7760d8e; retrieved 2026-09-16T03:11:34.853Z.