Boeing 747-200B N613US

Summary

On 29 September 1984 at about 21:38 local time, a Boeing 747-200B registered N613US was involved in an incident near Seattle, Washington, United States. 172 people were on board and nobody was injured. The aircraft was slightly damaged. No probable cause statement is available for this record.

Date

29 September 1984 at 21:38

Classification

Incident

Location

Seattle, Washington, United States

Coordinates

47.4403, -122.2801

Aircraft

Boeing 747-200B

Registration

N613US

Category

Airplane

Engines

4

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Seattle → Seoul, Korea

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

SEA84IA233

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB 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.

Quoted verbatim from the NTSB record.