Serious incident Boeing 747-251F N619US, Thursday 28 November 1985
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Date:Thursday 28 November 1985
Time:11:45 LT
Type:Silhouette image of generic B742 model; specific model in this crash may look slightly different    
Boeing 747-251F
Owner/operator:Northwest Airlines
Registration: N619US
MSN: 21321/308
Year of manufacture:1977
Total airframe hrs:23296 hours
Engine model:P&W JT9D-3 SER
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Minor
Category:Serious incident
Location:Glen Ellyn, IL -   United States of America
Phase: En route
Nature:Unknown
Departure airport:Chicago, IL (KORD)
Destination airport:Minneapolis-St. Paul International Airport, MN (MSP/KMSP)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
DURING CLIMB A BANG WAS HEARD AND THE AIRCRAFT SHUDDERED. THE CREW STATED THAT THE NUMBER THREE ENGINE OIL PRESSURE AND OIL QUANTITY INDICATED LOW. THE FIRE WARNING LIGHT AND BELL ACTIVVATED. THE ENGINE WAS SHUT DOWN AND THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. POSTFLIGHT INSPECTION REVEALED THE OUTBOARD COWLING OF THE NUMBER THREE ENGINE HAD SEPARATED. THE COWLING WAS FOUND IN A SUBURB TEN MILES SOUTHWEST OF THE AIRPORT. ENGINE TEARDOWN REVEALED A CRACK IN A VENT LINE STRUT IN THE DIFFUSER AREA ALLOWING BLEED AIR TO IGNITE OIL IN THE NUMBER THREE BEARING AREA. PRESSURE FORCED THE FIRE TO VENT THROUGH THE COMPARTMENT BREATHER AIR TUBE DISINTEGRATING THE MAIN BEARING BREATHER TUGE ELBOW. THE FORCE OF THE EXPLOSION AT THE DISINTEGRATING ELBOW BLEW THE OUTBOARD COWLING OFF.

Probable Cause:

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: CHI86IA034
Status: Investigation completed
Duration:
Download report: Final report

Sources:

NTSB CHI86IA034

Location

Revision history:

Date/timeContributorUpdates
29-Mar-2024 10:33 ASN Update Bot Added

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