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NTSB Report
September 29, 1984 · Boeing 747-200B · N613US
Seattle, WA
Overview
Report Status
Preliminary report
Event Type
Incident
Date
September 29, 1984
Injury Outcomes
No injuries (172 uninjured)
Location
Seattle, WA
Aircraft
Boeing 747-200B
Tail Number
N613US
Injuries
None
Aircraft Damage
Minor
NTSB Number
SEA84IA233
DURING CLIMBOUT, PASSING THRU 4000 FT MSL, THE ACFT EXPERIENCED A FAILURE OF THE #2 ENGINE. THE CREW REPORTED HEARING AN EXPLOSIVE SOUND FOLLOWED BY A DROP IN FUEL FLOW WITH N1 SPEED DECREASING TO 30% RPM ON THE #2 ENGINE. THE ACFT RETURNED TO SEATTLE FOR AN UNEVENTFUL LANDING. THE ENGINE EXHAUST TAIL CONE AND NUMEROUS TURBINE BLADES WERE LOCATED IN A RURAL AREA APRX 11 MILES SOUTH OF THE ARPT. INVESTIGATION REVEALED THE TURBINE STATOR SUPPORT STRUCTURE HAD WEAKENED BY SULFIDATION DUE TO EXHAUST GAGES ESCAPING THRU AN INSPECTION PORT. FAILURE OF THE PORT ALLOWED CONTACT WITH THE TURBINE BLADES, RESULTING IN BLADE ESCAPED AND SUBSEQUENT IMBALANCE.
Full Narrative
DURING CLIMBOUT, PASSING THRU 4000 FT MSL, THE ACFT EXPERIENCED A FAILURE OF THE #2 ENGINE. THE CREW REPORTED HEARING AN EXPLOSIVE SOUND FOLLOWED BY A DROP IN FUEL FLOW WITH N1 SPEED DECREASING TO 30% RPM ON THE #2 ENGINE. THE ACFT RETURNED TO SEATTLE FOR AN UNEVENTFUL LANDING. THE ENGINE EXHAUST TAIL CONE AND NUMEROUS TURBINE BLADES WERE LOCATED IN A RURAL AREA APRX 11 MILES SOUTH OF THE ARPT. INVESTIGATION REVEALED THE TURBINE STATOR SUPPORT STRUCTURE HAD WEAKENED BY SULFIDATION DUE TO EXHAUST GAGES ESCAPING THRU AN INSPECTION PORT. FAILURE OF THE PORT ALLOWED CONTACT WITH THE TURBINE BLADES, RESULTING IN BLADE ESCAPED AND SUBSEQUENT IMBALANCE.
Flight
Event TypeIncident
Event Time14:38 PDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 747-200B
Tail NumberN613US
Aircraft CategoryAir
DamageMinor
Operating RulePart 121
Engines4
Engine TypeTurbofan
Engine DetailsP&W · JT9D-7FCN · Turbofan · 50000
Seats394
People & Injuries
Injury SummaryNo injuries (172 uninjured)
Fatal0
Serious0
Minor0
Uninjured172
Total172
Crew 1Age 54 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind290° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point36 C
Altimeter29.00 inHg
Observation Time21:45
Weather SourceWFAC