NTSB Identification: ATL88IA227.
The docket is stored on NTSB microfiche number 37459.
Scheduled 14 CFR operation of NORTHWEST AIRLINES, INC
Incident occurred Friday, August 05, 1988 in ATLANTA, GA
Probable Cause Approval Date: 01/25/1990
Aircraft: DOUGLAS DC-9-51, registration: N775NC
Injuries: 84 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

JUST AFTER APPLYING TAKEOFF THRUST, THE CAPT NOTED AN UNFAMILIAR NOISE AND VIBRATION. THE TAKEOFF WAS ABORTED AND THE AIRPLANE RETURNED TO THE GATE. INSPECTION REVEALED THAT A SECOND STAGE FAN BLADE HAD PENETRATED THE ENGINE CASE AND WAS LODGED IN THE ENGINE COWLING. AD 87-14-01 REQUIRES ULTRASONIC INSPECTION OF THE FAN BLADES DURING THE FIRST SHOP VISIT AFTER JULY 27, 1987 AND REINSPECTION THEREAFTER AT INTERVALS OF 3,000 CYCLES TO 10,000 CYCLES. THE ENGINE HAD NOT BEEN IN THE SHOP SINCE MAY 2, 1986. IT HAD ACCUMULATED 3,485 CYCLES SINCE THE LAST SHOP VISIT.

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

COMPRESSOR ASSEMBLY,BLADE..FATIGUE

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