Serious incident Boeing 720-025 N8711E, Tuesday 5 June 1984

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Date:	Tuesday 5 June 1984
Time:	13:12 LT
Type:	Boeing 720-025
Owner/operator:	Windwalkers Air Country Club
Registration:	N8711E
MSN:	18240/246
Total airframe hrs:	29560 hours
Engine model:	P&W JT3C-7
Fatalities:	Fatalities: 0 / Occupants: 95
Other fatalities:	0
Aircraft damage:	None
Category:	Serious incident
Location:	Philadelphia, PA - United States of America
Phase:	Initial climb
Nature:	Unknown
Departure airport:	Philadelphia, PA (PHL
Destination airport:	Los Angeles, CA (KLAX)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
WHILE CLIMBING THRU 600 FT AFTER TAKEOFF, THE CREW HEARD A LOUD BANG, THE ACFT SHUTTERED & THE #3 ENG FIRE WARNING LIGHT ILLUMINATED. A FIRE BOTTLE WAS DISCHARGED. THE COPLT SAW FLAMES COMING FROM THE ENG & THE FIRE WARNING LIGHT REMAINED ILLUMINATED, SO A 2ND FIRE BOTTLE WAS DISCHARGED. THE AIRCREW RETURNED TO THE ARPT & LANDED WITHOUT FURTHER INCIDENT. EMERGENCY EQUIPMENT WAS STANDING BY & THE PASSENGERS DEPLANED NORMALLY. AN EXAM OF THE ENG REVEALED THAT THE 7TH STAGE TURBINE ASSEMBLY HAD FAILED, PENETRATING THE RIGHT SIDE OF THE CASE. THE 6TH & 8TH STAGES WERE DAMAGED BY THE DISPLACED 7TH STAGE ASSEMBLY. FUEL LINES & THE FIRE WARNING SYSTEM WERE ALSO DAMAGED.

Probable Cause:

Accident investigation: