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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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July 7, 1994 · Maule M-4-210 · N9808M

Northway, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
July 7, 1994
Injury Outcomes
No injuries (3 uninjured)
Location
Northway, AK
Aircraft
Maule M-4-210
Tail Number
N9808M
Operator
Smith Stephen W
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC94LA076

FOLLOWING THE PLANE'S DIVERGENCE FROM THE RUNWAY HEADING ON INITIAL ROLLOUT DURING GUSTY WIND CONDITIONS, THE LEFT MAIN LANDING GEAR COLLAPSED. FAA INSPECTION OF THE AIRCRAFT REVEALED THAT THE WELDS TO THE LANDING GEAR LONGERON FITTINGS DID NOT HAVE PROPER PENETRATION. THE PILOT REPORTED THAT THE FITTINGS WERE INSTALLED BY AN FAA REPAIR STATION WHEN THE AIRCRAFT WAS REPAIRED AFTER AN ACCIDENT APPROXIMATELY 300 FLIGHT HOURS PREVIOUS TO THIS OCCURRENCE.

NTSB Probable Cause

THE FAILURE OF THE LEFT MAIN LANDING GEAR ATTACHMENT FITTINGS AS A RESULT OF THE IMPROPER WELDS BY THE MAINTENANCE REPAIR FACILITY. FACTORS IN THE ACCIDENT THAT PRECIPITATED THE GEAR FAILURE WERE THE WIND GUSTS, AND THE PILOT NOT ADEQUATELY COMPENSATING FOR THE WIND CONDITIONS WHICH INDUCED HEAVY SIDE LOADS.

Full Narrative

On July 07, 1994, at 1315 Alaska daylight time, a wheel equipped Maule M-4-210 airplane, N9808M, registered to and operated by the pilot-in-command, ground looped during landing on runway 22 at the Northway Airport, Northway, Alaska. The private certificated pilot and his two passengers, the sole occupants, were not injured and the airplane sustained substantial damage. The pleasure flight, conducted under 14 CFR Part 91, last departed the Merrill Field Airport in Anchorage, Alaska at 1010 and the destination was Northway. The pilot reported that visual meteorological conditions prevailed with variable directional wind and gusts. A VFR flight plan was in effect with the Kenai Flight Service Station (FSS). The pilot, and FAA airworthiness inspector, told the NTSB investigator-in-charge during a telephone interview on the afternoon of July 07, 1994, that while landing on runway 22 he encountered variable and gusty wind conditions. He performed the approach with a little more airspeed than usual to compensate for any crosswind. The airplane touched down and bounced about two feet into the air before the main landing gear settled back onto the runway. As the tailwheel touched down, he pulled the power back to idle. Just as the power was reduced the right wing started to come up and he applied full right rudder as the airplane began to rotate to the left. He said that the rudder was ineffective at arresting the turn because he had reduced power and had little airflow over the rudder. As he started to add power, the left hand landing gear collapsed and the left wing hit the runway. The pilot reported that the left hand landing gear to fuselage attachment fittings failed by pulling away from the fuselage longeron due to an unairworthy weld. An examination of the left hand landing gear fittings by FAA Supervisory Airworthiness Inspector James F. Kuykendall of Northwest Mountain Region FSDO-09 revealed that the welds to the fittings did not have proper weld penetration into the metal of the fittings and in some areas no penetration. The pilot reported that the landing gear fittings were installed by a repair station when the aircraft was repaired after an accident approximately 300 flight hours previous to this occurrence.

Flight

Event TypeAccident
Event Time13:15 AKDT
Nearest AirportNORTHWAY (0nm)
Runway22
Runway Length5100 ft
Runway Width100 ft
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftMaule M-4-210
Tail NumberN9808M
Aircraft CategoryAir
DamageSubstantial
OperatorSmith Stephen W
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-360A · Reciprocating · 210
Seats4

People & Injuries

Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 45 · Third Class

Conditions

ConditionsVMC
LightDaylight
Wind290° @ 9 kt, gusting 15 kt
Visibility35 sm
CeilingBroken clouds 5000 ft
Temperature / Dew Point57 / 37 C
Altimeter29.00 inHg
Observation Time15:54
Weather SourceWFAC

Appendix: Source Data