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NTSB Report
March 27, 1991 · Nihon YS-11A-600 · N173RV
Anchorage, AK
Overview
Report Status
Probable Cause
Event Type
Incident
Date
March 27, 1991
Injury Outcomes
No injuries (4 uninjured)
Location
Anchorage, AK
Aircraft
Nihon YS-11A-600
Tail Number
N173RV
Operator
Reeve Aleutian Airways
Injuries
None
Aircraft Damage
Minor
NTSB Number
ANC91IA046
THE CREW OF FOUR WERE ON A TRAINING FLIGHT AND WERE PREPARING TO PERFORM APPROACH TO LANDING STALLS. DURING THE MANEUVER, THEY NOTICED THE NOSE GEAR WOULD NOT EXTEND. UNABLE TO EXTEND THE NOSE GEAR, THEY LANDED WITH THE NOSE GEAR UP CAUSING MINOR DAMAGE TO THE AIRPLANE. SUBSEQUENT EXAMINATION REVEALED THAT THE RIVETS WHICH RETAIN THE CENTERING CAM SHEAR PINS WERE SHEARED. THE SHEAR PINS WERE NOT SHEARED. AN EXAMINATION BY MITSUBISHI HEAVY INDUSTRIES, NAGOYA AIRPLANE WORKS, INDICATED THAT THE SHEAR PINS MAY HAVE BEEN INSTALLED IN REVERSE. THE OVERHAUL MANUAL ALSO CONTAINED AMBIGUOUS INFORMATION CONCERNING THE INFORMATION. THE GRAPHICAL DISPLAY SHOWED THE INSTALLATION INCORRECTLY, BUT THE TEXT EXPLAINED THE INSTALLATION CORRECTLY.
NTSB Probable Cause
A JAMMED NOSE GEAR DUE TO INCORRECT INSTALLATION OF THE SHEAR PIN. CONTRIBUTING TO THE ACCIDENT WAS THE INSUFFICIENTLY DEFINED MAINTENANCE PROCEDURE.
Full Narrative
THE CREW OF FOUR WERE ON A TRAINING FLIGHT AND WERE PREPARING TO PERFORM APPROACH TO LANDING STALLS. DURING THE MANEUVER, THEY NOTICED THE NOSE GEAR WOULD NOT EXTEND. UNABLE TO EXTEND THE NOSE GEAR, THEY LANDED WITH THE NOSE GEAR UP CAUSING MINOR DAMAGE TO THE AIRPLANE. SUBSEQUENT EXAMINATION REVEALED THAT THE RIVETS WHICH RETAIN THE CENTERING CAM SHEAR PINS WERE SHEARED. THE SHEAR PINS WERE NOT SHEARED. AN EXAMINATION BY MITSUBISHI HEAVY INDUSTRIES, NAGOYA AIRPLANE WORKS, INDICATED THAT THE SHEAR PINS MAY HAVE BEEN INSTALLED IN REVERSE. THE OVERHAUL MANUAL ALSO CONTAINED AMBIGUOUS INFORMATION CONCERNING THE INFORMATION. THE GRAPHICAL DISPLAY SHOWED THE INSTALLATION INCORRECTLY, BUT THE TEXT EXPLAINED THE INSTALLATION CORRECTLY.
Flight
Event TypeIncident
Event Time11:23 AKST
Nearest AirportAnchorage (0nm)
Runway6
Runway Length10600 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftNihon YS-11A-600
Tail NumberN173RV
Aircraft CategoryAir
DamageMinor
OperatorReeve Aleutian Airways
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsRolls-Royce · 542-10K · Turboprop · 2775
Seats3
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 42 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind60° @ 7 kt
Visibility1 sm
CeilingOvercast 4000 ft
Temperature / Dew Point37 C / 30 C
Altimeter29.00 inHg
Observation Time20:23
Weather SourceWFAC