Incident Overview
During final approach near the outer marker, the flight crew of a Boeing 727-200 received an intermittent fire warning indication for the number one engine. The crew shut down the engine and discharged the fire bottle, but the warning continued.
Aircraft Landing and Ground Actions
After landing and clearing the runway, the aircraft was stopped. With the fire warning still active, the crew discharged a second fire bottle. As the warning persisted, a precautionary emergency evacuation was initiated.
Post-Incident Inspection
Examination of the aircraft following the incident disclosed a chaffed fire loop on the number one engine, which had caused the intermittent fire warning.