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NTSB Report
April 14, 1988 · Fokker F28 MK 4000 F28 MK 400 · N110UR
Charleston, WV
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 14, 1988
Injury Outcomes
8 injuries (8 minor injuries), 54 uninjured
Location
Charleston, WV
Aircraft
Fokker F28 MK 4000 F28 MK 400
Tail Number
N110UR
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
BFO88FA036
THE ACFT WAS AT FLIGHT LEVEL 310, WHEN THE NO. 2 ENGINE FIRST STAGE TURBINE DISC SEPARATED, CAUSING AN UNCONTAINED ENGINE FAILURE. TURBINE DEBRIS PENETRATED THE FUSELAGE STRUCTURE & CAUSED DEPRESSURIZATION. THE PLT MADE AN EMERGENCY DESCENT & LANDED AT CHARLESTON, WV, WHICH WAS ABOUT 50 MILES AWAY. THE INVESTIGATION REVEALED SEVERE RUBBING & MELTING OF THE LOW PRESSURE TURBINE INTERSTAGE SEAL & SEPARATION OF THE DRIVE FLANGES CONNECTING THE LP1 & LP2 TURBINE DISCS. ROLLS-ROYCE REPAIR SCHEME XRS 3505 DESCRIBES A PROCEDURE FOR REPAIR OF THE INTERSTAGE SEALS. HOWEVER, IN REPLACING THE SEALS, THE REPAIR FACILITY USED MACHINING REFERENCE SURFACES WHICH DIFFERED FROM THOSE IN THE REPAIR SCHEME. ROLLS-ROYCESUBSEQUENTLY AMENDED XRS 3505 TO MAKE IT MORE TOLERABLE TO RUBBING OR MISASSEMBLY OF THE LOW PRESSURE TURBINE SEAL. ALL OF THE FIRST CLASS SECTION & TWO CABIN SECTION PASSENGER OXYGEN MASKS FAILED TO DEPLOY.
NTSB Probable Cause
ENGINE AND AIRFRAME FAILURE WERE CAUSED BY THE THE SEPARATION OF THE FIRST STAGE LOW PRESSURE TURBINE DISK. THE DISC INTERSTAGE SEAL WAS INSTALLED INADEQUATELY, RESULTING IN RUBBING BETWEEN THE SEAL AND DISK, CAUSING FAILURE OF THE DISK. INADEQUATE PROCEDURE BY MAINTENANCE PERSONNEL ARE A CONTRIBUTING FACTOR.
Full Narrative
THE ACFT WAS AT FLIGHT LEVEL 310, WHEN THE NO. 2 ENGINE FIRST STAGE TURBINE DISC SEPARATED, CAUSING AN UNCONTAINED ENGINE FAILURE. TURBINE DEBRIS PENETRATED THE FUSELAGE STRUCTURE & CAUSED DEPRESSURIZATION. THE PLT MADE AN EMERGENCY DESCENT & LANDED AT CHARLESTON, WV, WHICH WAS ABOUT 50 MILES AWAY. THE INVESTIGATION REVEALED SEVERE RUBBING & MELTING OF THE LOW PRESSURE TURBINE INTERSTAGE SEAL & SEPARATION OF THE DRIVE FLANGES CONNECTING THE LP1 & LP2 TURBINE DISCS. ROLLS-ROYCE REPAIR SCHEME XRS 3505 DESCRIBES A PROCEDURE FOR REPAIR OF THE INTERSTAGE SEALS. HOWEVER, IN REPLACING THE SEALS, THE REPAIR FACILITY USED MACHINING REFERENCE SURFACES WHICH DIFFERED FROM THOSE IN THE REPAIR SCHEME. ROLLS-ROYCESUBSEQUENTLY AMENDED XRS 3505 TO MAKE IT MORE TOLERABLE TO RUBBING OR MISASSEMBLY OF THE LOW PRESSURE TURBINE SEAL. ALL OF THE FIRST CLASS SECTION & TWO CABIN SECTION PASSENGER OXYGEN MASKS FAILED TO DEPLOY.
Flight
Event TypeAccident
Event Time09:45 EDT
Nearest AirportYEAGER (0nm N)
Runway5
Runway Length6302 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFokker F28 MK 4000 F28 MK 400
Tail NumberN110UR
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsRolls-Royce · 555-15P · Turbofan · 9850
Seats72
People & Injuries
Injury Summary8 injuries (8 minor injuries), 54 uninjured
Fatal0
Serious0
Minor8
Uninjured54
Total62
Crew 1Age 45 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind190° @ 4 kt
Visibility7 sm
CeilingOvercast 25000 ft
Temperature / Dew Point57 / 39 C
Altimeter29.00 inHg
Observation Time13:50
Weather SourceWFAC