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Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

September 24, 1999 · Maule ML-4 · N4623T

Anchorage, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
September 24, 1999
Injury Outcomes
1 injury (1 minor injury)
Location
Anchorage, AK
Aircraft
Maule ML-4
Tail Number
N4623T
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ANC99LA152

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.

NTSB Probable Cause

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.

Full 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.

Flight

Event TypeAccident
Event Time13:06 AKDT
Nearest AirportLake Hood Strip (0nm)
Runway31
Runway Length2200 ft
Runway Width70 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftMaule ML-4
Tail NumberN4623T
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-300A · Reciprocating · 145
Seats4

People & Injuries

Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 68 · First Class

Conditions

ConditionsVMC
LightDaylight
Wind70° @ 6 kt
Visibility10 sm
CeilingBroken clouds 10000 ft
Temperature / Dew Point52 / 34 C
Altimeter29.00 inHg
Observation Time15:53
Weather SourceWFAC

Appendix: Source Data