NTSB CAROL · Event
Event ANC99LA152
Registry · N4623T
FAA Aircraft Registry record.
Make / Model
MAULE M-4
Engine
CONT MOTOR 0-300 SER (145 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
19651021
ADS-B equipped
Yes — Mode-S A5A3DC
Registrant of record
COREY GLENN M
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
The improper (reversed) connection of the elevator control cables by the owner/pilot-mechanic, and the failure to have the installation inspected by another mechanic.
Factual narrative
On September 24, 1999, at 1306 Alaska daylight time, a Maule ML-4 airplane, N4623T, sustained substantial damage when it nosed over during takeoff from the Lake Hood Strip, Anchorage, Alaska. The solo airline transport pilot received minor injuries. The airplane was being operated as a visual flight rules (VFR) postmaintenance check flight under Title 14, CFR Part 91, when the accident occurred. Visual meteorological conditions prevailed at the time of the accident. No flight plan was filed. According to the FAA inspector who interviewed the pilot, and inspected the airplane at the scene, the pilot was beginning the first flight after rebuilding the airplane. The pilot indicated to the inspector, that as the airplane began to fly off the runway, he pulled aft on the yoke, and the airplane nosed over. A postaccident inspection revealed the elevator cables were connected backwards. The pilot, who is also a certificated aircraft mechanic, told the NTSB investigator-in-charge (IIC) during a telephone interview on September 27, that he bought the airplane as a project, and rebuilt it. He stated that during the rebuild he hooked up the elevator cables backwards, and did not recognize the error during his inspection. He added that he did not have anyone else inspect his work. He indicated that he was beginning the takeoff on the first test flight, and as soon as he pulled aft on the yoke, the airplane nosed over. The airplane came to rest inverted, and sustained substantial damage to both wings, the vertical stabilizer, and the left wing lift-strut. The pilot was beginning the first postmaintenance check flight after rebuilding the airplane. As the airplane began to fly off the runway, the pilot pulled aft on the yoke, and the airplane nosed over. Postaccident inspection revealed the elevator cables were connected backwards. The pilot, who is also a certificated aircraft mechanic, told the NTSB investigator-in-charge that he bought the airplane as a project and rebuilt it. He stated he hooked up the elevator cables backwards, and did not recognize the error during his inspection. He added that he did not have anyone else inspect his work. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1999_ANC99LA152.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type or causal vocabulary (stall, maintenance). Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2023 · Conference paper
The Value of Strong Partnerships to Build a Successful Aviation Maintenance Career Pathway Program for Transitioning Military Service Members
The aerospace industry is competing with other industries for a qualified workforce, and many of those competing industries are investing heavily in creating workforce development pipelines.
- Embry-Riddle Scholarly Commons 2026 · Journal article (IJAAA)
From Reactive to Predictive: A hybrid Trust-Mediated Adoption Framework for Data-Driven Maintenance in Distributed-Authority Aviation Environments
Modern aviation maintenance operates within increasingly data-intensive technological environments, yet the operational integration of predictive maintenance into routine decision-making remains incon…
- NASA NTRS 2026 · Conference Paper
Computational Analysis of Steady State Aerodynamics of Transonic Truss-Braced Wing Configuration in Deep Stall
This study presents a computational investigation of steady state aerodynamics of the Subsonic Ultra-Green Aircraft Research (SUGAR) Transonic Truss-Braced Wing (TTBW) configuration over a wide range …
- Semantic Scholar 2025 · Article (Applied Sciences)
Decision-Making Framework for Aviation Safety in Predictive Maintenance Strategies
The implementation of predictive maintenance (PM) in aviation presents unique challenges due to strict safety requirements, complex operational environments, and regulatory constraints.
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
Low-Resource Automatic Speech Recognition Domain Adaptation – A Case-Study in Aviation Maintenance
With timeliness and efficiency being critical in the aviation maintenance industry, the need has been growing for smart technological solutions that optimize and streamline the different underlying ta…
- Embry-Riddle Scholarly Commons 2024 · Journal article (JAAER)
A New Trajectory in UAV Safety: Leveraging Reinforcement Learning for Distance Maintenance Under Wind Variations
In the field of aviation, safety is a critical cornerstone, and the operation of Unmanned Aerial Vehicle (UAV) systems is deeply connected with this principle.
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