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Last updated: 20 September 2019
Status:Final
Date:Sunday 12 September 1999
Time:07:11
Type:Silhouette image of generic B733 model; specific model in this crash may look slightly different
Boeing 737-3T0
Operator:Continental Air Lines
Registration: N17356
C/n / msn: 23942/1522
First flight: 1988-03-02 (11 years 7 months)
Total airframe hrs:34602
Engines: 2 CFMI CFM56-3B1
Crew:Fatalities: 0 / Occupants: 5
Passengers:Fatalities: 0 / Occupants: 84
Total:Fatalities: 0 / Occupants: 89
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:West Palm Beach International Airport, FL (PBI) (   United States of America)
Phase: En route (ENR)
Nature:Domestic Scheduled Passenger
Departure airport:West Palm Beach International Airport, FL (PBI/KPBI), United States of America
Destination airport:Houston-George Bush Intercontinental Airport, TX (IAH/KIAH), United States of America
Flightnumber:CO1933
Narrative:
A Boeing 737-300, operated by Continental Airlines as flight 1933, had a failure of the No. 1 engine shortly after takeoff from West Palm Beach.
The captain stated he was in the right seat and acting as a check airman. The second pilot, who was flying the aircraft from the left seat, was receiving initial operating experience as a captain. Both pilots stated that after takeoff on runway 9 left, as they were climbing through about 1,000 feet, there was the sound of a loud bang, they felt a extremely violent jolt, and felt severe shaking of a short duration. The No. 1 engine gauges went to zero. There was no indication of fire. The second pilot continued to fly the airplane and the captain ensured the No. 2 engine was increased to full power. They entered a left downwind leg for runway 9 left and returned to West Palm Beach International Airport, where they landed without further incident.
Examination of the airplane showed there was damage to the left wing high lift devices, fuselage, vertical and horizontal stabilizers, rudder, and tail cone. The No. 1 engine left thrust reverser had separated. Debris from the No.1 engine was located over an eight block long by three block wide city block area. Examination of the No. 1 engine revealed that it had a 360 degree separation in plane with the high pressure turbine (HPT) rotor and that the HPT shaft and the HPT forward rotating air seal had exited the engine. The HPT rotating air seal was recovered in the debris field.

Probable Cause:

PROBABLE CAUSE: "The fatigue fracture and separation of the high pressure turbine forward rotating air seal due to a manufacturing defect in a bolt hole that was not detected by the engine manufacturer due to inadequate and ineffective inspection techniques. Contributing to the accident was the engine manufacturers failure to provide adequate hole making requirements at the time the forward rotating air seal was manufactured and the engine manufacturers failure at the time of last inspection to require eddy current inspections for the high pressure turbine forward rotating air seal bolt holes."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 11 months
Accident number: MIA99FA252
Download report: Summary report

Classification:
Forced landing on runway

Sources:
» NTSB id 20001212X19822


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from West Palm Beach International Airport, FL to Houston-George Bush Intercontinental Airport, TX as the crow flies is 1526 km (954 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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