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NTSB Report
April 3, 1990 · Nihon YS-11A-600F YS-11A-600 · N112MP
West Lafayette, IN
Overview
Report Status
Probable Cause
Event Type
Incident
Date
April 3, 1990
Injury Outcomes
No injuries (2 uninjured)
Location
West Lafayette, IN
Aircraft
Nihon YS-11A-600F YS-11A-600
Tail Number
N112MP
Injuries
None
NTSB Number
CHI90IA106
THE TRANSPORT CATEGORY AIRCRAFT WAS RETURNING TO THE HOME BASE EMPTY (BALLAST ONLY). WEATHER CONDITIONS EXISTED WHICH WERE CONDUCIVE TO AIRFRAME ICING. ON FINAL APPROACH, WHEN LANDING FLAPS WERE SELECTED, THE AIRCRAFT PITCHED NOSE DOWN ACCOMPANIED BY BUFFETING OF THE AIRFRAME. THE CAPTAIN TOOK CONTROL (FIRST OFFICER HAD BEEN FLYING) AND ADDED FULL POWER. THE FIRST OFFICER SELECTED 15 DEGREES FLAP. THE AIRCRAFT RECOVERED, BUT CONTINUED TO EXHIBIT BUFFETING. THE AIRCRAFT DIVERTED TO AN AIRPORT WITH A LONGER RUNWAY AND A SUCCESSFUL LANDING WAS ACCOMPLISHED. SUBSEQUENT INVESTIGATION REVEALED SUBSTANTIAL ICE ACCUMULATION OUTSIDE THE BOOTED AREA ON THE HORIZONTAL TAIL.
NTSB Probable Cause
AN UNDETECTED ACCUMULATION OF ICE ON THE HORIZONTAL STABILIZER. RELATING FACTORS WERE THE MANUFACTURER'S LACK OF INFORMATION AND AIRCRAFT MANUALS RELATIVE TO THE UNDERSTANDING OF, AND APPROPRIATE PROCEDURES TO PREVENT THE LOSS OF CONTROL.
Full Narrative
THE TRANSPORT CATEGORY AIRCRAFT WAS RETURNING TO THE HOME BASE EMPTY (BALLAST ONLY). WEATHER CONDITIONS EXISTED WHICH WERE CONDUCIVE TO AIRFRAME ICING. ON FINAL APPROACH, WHEN LANDING FLAPS WERE SELECTED, THE AIRCRAFT PITCHED NOSE DOWN ACCOMPANIED BY BUFFETING OF THE AIRFRAME. THE CAPTAIN TOOK CONTROL (FIRST OFFICER HAD BEEN FLYING) AND ADDED FULL POWER. THE FIRST OFFICER SELECTED 15 DEGREES FLAP. THE AIRCRAFT RECOVERED, BUT CONTINUED TO EXHIBIT BUFFETING. THE AIRCRAFT DIVERTED TO AN AIRPORT WITH A LONGER RUNWAY AND A SUCCESSFUL LANDING WAS ACCOMPLISHED. SUBSEQUENT INVESTIGATION REVEALED SUBSTANTIAL ICE ACCUMULATION OUTSIDE THE BOOTED AREA ON THE HORIZONTAL TAIL.
Flight
Event TypeIncident
Event Time06:45 EDT
Nearest AirportPurdue University (0nm N)
Runway10
Runway Length6600 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftNihon YS-11A-600F YS-11A-600
Tail NumberN112MP
Aircraft CategoryAir
Operating RulePart 121
Engines2
Engine TypeTurboprop
Engine DetailsRolls-Royce · DART 542-10J · Turboprop · 2750
Seats3
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 29 · First Class
Conditions
ConditionsVMC
LightDark Night
Wind350° @ 8 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point34 C / 28 C
Altimeter30.00 inHg
Observation Time10:52
Weather SourceWFAC