# NTSB FTW96IA066: McDonnell Douglas DC-9-32, N930VV, Dfw Airport, TX, December 12, 1995 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: December 12, 1995, 09:03 local (15:03 UTC) - Place: Dfw Airport, TX - Location: 32.8972° N, 97.0377° W: Placed by OpenAirDocs: center of DALLAS-FORT WORTH INTL (DFW), within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=32.8972&lon=-97.0377&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 59 uninjured - Status: Completed, report February 28, 1997 - Report: Approved by Office Director - NTSB case key (mKey): 19668 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW96IA066 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/19668/pdf - Page: https://openairdocs.org/ntsb/FTW96IA066 ## Probable cause fatigue failure of a first stage, high pressure, turbine blade. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, takeoff - initial climb - turbine assembly,turbine blade - fatigue (cause) - turbine assembly,turbine blade - failure (cause) - engine shutdown - performed, pilot in command - precautionary landing - performed, pilot in command ## Analysis After takeoff, Valujet Flight 224, a McDonnell Douglas DC-9-32, was climbing through about 5,000 feet, when a contained failure of the #2 engine occurred. The flight crew secured the engine and declared an emergency, and the airplane was vectored back to the airport, where a single engine landing was made without further incident. Examination and teardown of the Pratt & Whitney JT8D-9A engine revealed that a turbine blade (part number 823201) in the first stage high pressure turbine assembly had failed due to fatigue. The blade part number indicated that the leading edge of the blade had been reworked in accordance with Pratt & Whitney Service Bulletin 4345 to remove cracking. The engine had accumulated a total of 32,028 flight hours and 25,603 cycles, since last overhaul, it had accumulated 2,794 flight hours and 2,329 cycles. ## Factual narrative On December 12, 1995, at 0903 central standard time, a Douglas DC-9-32, N930VV, registered and operated by Valujet Airlines Inc., as Flight 224 under the provisions of Title 14 CFR Part 121 on a regularly scheduled domestic flight, experienced a contained failure of the number 2 engine during initial takeoff climb from the Dallas/Ft. Worth International Airport. Visual meteorological conditions prevailed at the time of the incident and an IFR flight plan was in effect. The airplane was not damaged and there were no injuries to the 54 passengers and 5 crewmembers aboard the airplane. The flight's intended destination was Atlanta, Georgia. According to the flight crew, the airplane was passing through 5,000 feet during the initial takeoff climb, when a loud bang was heard, followed by a moderate vibration. The captain retarded the number 2 engine to flight idle and the vibration continued. The flight crew secured the engine, declared an emergency, and the airplane returned to DFW where a landing was made on Runway 17L at 0930 without further incident. Initial examination of the Pratt & Whitney JT8D-9A turbofan engine confirmed that the failure was contained and no evidence of internal or external fire was found. A preliminary boroscope inspection by contract maintenance personnel revealed that a first stage turbine blade failed. The airplane was released to the operator and the engine retained for further examination and teardown at a contract engine facility operated by Air New Zealand, in New Zealand. Examination and teardown of the engine revealed that a blade (part number 823201) in the first stage high pressure turbine assembly (part number 587501, serial number 8B2545) failed due to leading edge fatigue. Since the last overhaul, the turbine disk had accumulated 2,794 hours and 2,329 cycles. Markings on the failed blade identified the vendor as Chromalloy Southwest. The teardown was observed by members of the Transport Accident Investigation Commission in Wellington, New Zealand. A written report was not rendered. Total time on the airplane was 41,206 hours/33,846 cycles. The number two engine, serial number 667136 was manufactured on April 28, 1975, and had accumulated a total of 32,028 hours/25,603 cycles. Total time since last overhaul/installation was 2,794 hours/2,329 cycles. Aircraft serial number 47723 (N930VV) was purchased by ValuJet from Turk Hava Yollari (THY), Turkish Airlines, on October 3, 1994, as part of a formal sales agreement for the purchase of nine DC-9-32 airplanes, five spare engines, and approximately 4,400 spare parts. A review of the maintenance documentation by the FAA inspector did not reveal any anomalies or uncorrected defects prior to the flight. Aircraft serial number 47723 was the first of nine DC-9s to be flight delivered to ValuJet. Engine serial number 667136 was installed on the right (number 2) position as specified in the sales contract. The engine remained in that position until the time of this incident. ## Aircraft - Registration: N930VV (not matched to a registry record) - Reported make and model: McDonnell Douglas DC-9-32 - Category: Airplane - Serial number: 47723 - Airframe hours: 41199 - Engines: P&W JT8D-9A 14500 lbs thrust turbo jet - Damage: No damage - Flight: Part 121 - Registered owner: Valujet Airlines - Airworthiness certificate: Standard, Transport - Last inspection: Continuous airworthiness, December 10, 1995, 20 hours before - Destination: ATL, ATLANTA, GA - Flight plan: IFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 7,880 total, 2,025 in this make and model, 4,280 as pilot in command, 228 in the last 90 days, 72 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 180° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °F, dew point 45 °F ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 19951212044529I](https://openairdocs.org/incident/19951212044529I), Dec 12, 1995: Doug DC932, Dallas-Ft Worth, TX. Narrative: on December 12, 1995, valujet flight 224 departed Dallas/fort Worth airport at 0900 CST enroute to atlanta, Georgia. During climb at 5000 feet… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.