NTSB Identification: MIA98FA112.
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Nonscheduled 14 CFR (D.B.A. ROYAL AIRLINES )
Accident occurred Monday, March 30, 1998 in FORT LAUDERDALE, FL
Probable Cause Approval Date: 11/17/1999
Aircraft: Boeing 727-212, registration: CFRYS
Injuries: 3 Serious,14 Minor,177 Uninjured.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

On takeoff roll, between 90 and 100 knots, the No. 2 engine sustained an uncontained failure. The flight crew aborted the takeoff and when informed that smoke was emanating from No. 2 engine, the crew brought the airplane to a stop on a taxiway, and the pilot commanded a passenger emergency evacuation. Examination of the engine revealed that one of 12 low pressure compressor (LPC) rear tiebolts fractured at its 4th stage disk land and was separated into the plenum ahead of the LPC. The separated tierod impacted the other 11 tierods until they eventually fractured, causing catastrophic separation of the LPC assembly between the 3rd and 4th stage rotors. Metallurgical examination of the failed tierods revealed the first tierod failed due to fatigue and the other 11 due to stress. It was further revealed that an anti-gallant treatment to the tierods that are used to bolt the 3rd through 6th compressor disks together as a unit was not present. The treatment is applied to the lands of the tierods at manufacture as specified in Pratt & Whitney Service Bulletin No. 5407.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

Failure of the No.2 engine low pressure compressor rear tierod. Also contributing to the accident was failure of the manufacturer to apply an antigallant treatment to the tierod's compressor disk lands during manufacture.

Full narrative available

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