What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On October 7, 1998, about 0710 eastern daylight time, a Boeing 727-224, N66734, operated by Continental airlines, inc. as flight 1521, title 14 CFR part 121 scheduled domestic passenger service from Miami, Florida to houston, Texas, had an uncontained failure of the no. 2 engine during takeoff roll at Miami. Visual meteorological conditions prevailed at the time and an instrument flight rules flight plan was filed. Just prior to maximum takeoff power being set, a loud bang noise was heard. Takeoff was aborted and the aircraft exited the runway at the next turnoff. A portable airstair was brought to the aircraft. The flight attendants and 75 passengers deplaned through forward entry door and no injuries were sustained. The pilots remained with the aircraft until the aircraft was towed to the gate. Examination of the aircraft revealed an uncontained failure occurred in the high pressure compressor of the no. 2 engine. A piece of the 8th stage high pressure compressor (hpc) disk impacted and entered the vertical stabilizer of the airplane causing substantial damage. (.4)during the initial part of the takeoff, prior to the engines reaching takeoff power, the no. 2 engine had an uncontained failure of the 8th stage hpc disk. The takeoff was aborted, the passengers were bussed to the terminal, and the aircraft was towed to the gate. Metallurgical examination of the 8th stage hpc disk showed that a significant amount of cadmium was present on steel base metal in the area of the fracture surfaces and the surface had an inadequate nickel coating. The disk had accumulated 359 flight hours since overhaul. The disk had been nickel-cadmium plated in March 1996 and was stored until February 1998, when it was installed in the accident engine during repair. Other hpc disk installed in the accident engine, which had been nickel-cadmium plated by the same company as the 8th stage hpc disk, were also found to have inadequate nickel coating. During nickel-cadmium plating the nickel acts as a barrier coating between the cadmium and the steel part to prevent cadmium from contacting the steel part, which can cause cadmium embrittlement.
As the FAA filed it
ON OCTOBER 7, 1998, ABOUT 0710 EASTERN DAYLIGHT TIME, A BOEING 727-224, N66734, OPERATED BY CONTINENTAL AIRLINES, INC. AS FLIGHT 1521, TITLE 14 CFR PART 121 SCHEDULED DOMESTIC PASSENGER SERVICE FROM MIAMI, FLORIDA TO HOUSTON, TEXAS, HAD AN UNCONTAINED FAILURE OF THE NO. 2 ENGINE DURING TAKEOFF ROLL AT MIAMI. VISUAL METEOROLOGICAL CONDITIONS PREVAILED AT THE TIME AND AN INSTRUMENT FLIGHT RULES FLIGHT PLAN WAS FILED. JUST PRIOR TO MAXIMUM TAKEOFF POWER BEING SET, A LOUD BANG NOISE WAS HEARD. TAKEOFF WAS ABORTED AND THE AIRCRAFT EXITED THE RUNWAY AT THE NEXT TURNOFF. A PORTABLE AIRSTAIR WAS BROUGHT TO THE AIRCRAFT. THE FLIGHT ATTENDANTS AND 75 PASSENGERS DEPLANED THROUGH FORWARD ENTRY DOOR AND NO INJURIES WERE SUSTAINED. THE PILOTS REMAINED WITH THE AIRCRAFT UNTIL THE AIRCRAFT WAS TOWED TO THE GATE. EXAMINATION OF THE AIRCRAFT REVEALED AN UNCONTAINED FAILURE OCCURRED IN THE HIGH PRESSURE COMPRESSOR OF THE NO. 2 ENGINE. A PIECE OF THE 8TH STAGE HIGH PRESSURE COMPRESSOR (HPC) DISK IMPACTED AND ENTERED THE VERTICAL STABILIZER OF THE AIRPLANE CAUSING SUBSTANTIAL DAMAGE. (.4)DURING THE INITIAL PART OF THE TAKEOFF, PRIOR TO THE ENGINES REACHING TAKEOFF POWER, THE NO. 2 ENGINE HAD AN UNCONTAINED FAILURE OF THE 8TH STAGE HPC DISK. THE TAKEOFF WAS ABORTED, THE PASSENGERS WERE BUSSED TO THE TERMINAL, AND THE AIRCRAFT WAS TOWED TO THE GATE. METALLURGICAL EXAMINATION OF THE 8TH STAGE HPC DISK SHOWED THAT A SIGNIFICANT AMOUNT OF CADMIUM WAS PRESENT ON STEEL BASE METAL IN THE AREA OF THE FRACTURE SURFACES AND THE SURFACE HAD AN INADEQUATE NICKEL COATING. THE DISK HAD ACCUMULATED 359 FLIGHT HOURS SINCE OVERHAUL. THE DISK HAD BEEN NICKEL-CADMIUM PLATED IN MARCH 1996 AND WAS STORED UNTIL FEBRUARY 1998, WHEN IT WAS INSTALLED IN THE ACCIDENT ENGINE DURING REPAIR. OTHER HPC DISK INSTALLED IN THE ACCIDENT ENGINE, WHICH HAD BEEN NICKEL-CADMIUM PLATED BY THE SAME COMPANY AS THE 8TH STAGE HPC DISK, WERE ALSO FOUND TO HAVE INADEQUATE NICKEL COATING. DURING NICKEL-CADMIUM PLATING THE NICKEL ACTS AS A BARRIER COATING BETWEEN THE CADMIUM AND THE STEEL PART TO PREVENT CADMIUM FROM CONTACTING THE STEEL PART, WHICH CAN CAUSE CADMIUM EMBRITTLEMENT.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.
Other reports on N66734 · 2
Matched to the same aircraft by N-number and date.