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NTSB Report
May 4, 1989 · Fokker F-27 MK500 · N511AW
Moline, IL
Overview
Report Status
Probable Cause
Event Type
Incident
Date
May 4, 1989
Injury Outcomes
No injuries (2 uninjured)
Location
Moline, IL
Aircraft
Fokker F-27 MK500
Tail Number
N511AW
Operator
Air Wisconsin
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI89IA084
THE AIRPLANE LANDED WITH THE RIGHT MAIN LANDING GEAR NOT FULLY DOWN AND LOCKED. WHEN THE AIRPLANE TOUCHED DOWN, THE LANDING GEAR WOULD NOT SUPPORT THE WEIGHT OF THE AIRPLANE AND IT COLLAPSED. THE AIRPLANE SUSTAINED MINOR DAMAGE AND NEITHER OF THE TWO CREWMEMBERS ABOARD THE AIRPLANE WERE INJURED. THE LANDING GEAR MALFUNCTION HAD BEEN DISCOVERED WHEN THE LANDING GEAR WOULD NOT CYCLE PROPERLY DURING A MAINTENANCE CHECK FLIGHT. WHEN THE FLIGHT CREW ATTEMPTED TO LOWER THE LANDING GEAR AFTER RETRACTION, THE RIGHT MAIN LANDING GEAR WOULD NOT FULLY EXTEND. ATTEMPTS TO EXTEND THE LANDING GEAR USING EMERGENCY PROCEDURES WERE NOT SUCCESSFUL.
NTSB Probable Cause
MATERIAL FAILURE OF THE LANDING GEAR RETRACTION AND EXTENSION ASSEMBLY. INADEQUATE MAINTENANCE AND TROUBLESHOOTING PROCEDURES IN COMPANY DIRECTIVES WERE FACTORS IN THIS INCIDENT.
Full Narrative
THE AIRPLANE LANDED WITH THE RIGHT MAIN LANDING GEAR NOT FULLY DOWN AND LOCKED. WHEN THE AIRPLANE TOUCHED DOWN, THE LANDING GEAR WOULD NOT SUPPORT THE WEIGHT OF THE AIRPLANE AND IT COLLAPSED. THE AIRPLANE SUSTAINED MINOR DAMAGE AND NEITHER OF THE TWO CREWMEMBERS ABOARD THE AIRPLANE WERE INJURED. THE LANDING GEAR MALFUNCTION HAD BEEN DISCOVERED WHEN THE LANDING GEAR WOULD NOT CYCLE PROPERLY DURING A MAINTENANCE CHECK FLIGHT. WHEN THE FLIGHT CREW ATTEMPTED TO LOWER THE LANDING GEAR AFTER RETRACTION, THE RIGHT MAIN LANDING GEAR WOULD NOT FULLY EXTEND. ATTEMPTS TO EXTEND THE LANDING GEAR USING EMERGENCY PROCEDURES WERE NOT SUCCESSFUL.
Flight
Event TypeIncident
Event Time20:07 CDT
Nearest AirportQuad Cities (0nm N)
Runway27
Runway Length8507 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFokker F-27 MK500
Tail NumberN511AW
Aircraft CategoryAir
DamageMinor
OperatorAir Wisconsin
Operating RulePart 121
Engines2
Engine TypeTurboprop
Engine DetailsRolls-Royce · DART 552-7R · Turboprop · 508
Seats53
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 45 · First Class
Conditions
ConditionsVMC
LightBright Night
Wind200° @ 5 kt
Visibility12 sm
CeilingNone
Temperature / Dew Point61 F / 43 C
Altimeter30.00 inHg
Observation Time20:20
Weather SourceWFAC