NTSB Identification: ATL86IA054.
The docket is stored on NTSB microfiche number 30040.
Scheduled 14 CFR operation of DELTA AIR LINES,INC.
Incident occurred Thursday, January 09, 1986 in MEMPHIS, TN
Aircraft: BOEING 727-232, registration: N403DA
Injuries: 38 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.

THE AIRCREW RPRTD THAT WHEN THE LANDING GEAR WAS RETRACTED AFTER TAKEOFF, THE L MAIN GEAR INDICATED UNSAFE & THERE WAS AN UNSAFE DOOR INDICATION. THEY RECYCLED THE GEAR, BUT OBSERVED THE SAME INDICATIONS. THE GEAR HANDLE WAS THEN PUT IN THE NEUTRAL PSN & THE L MAIN GEAR EXTENDED TO A DOWN & LOCKED PSN. THE CAPT DECIDED TO RETURN TO MEMPHIS & MAKE A PRECAUTIONARY LANDING. AFTER THE GEAR EXTENSION CYCLE, ALL GEAR INDICATED DOWN & SAFE. ALSO, TWR PSNL CONFIRMED THE GEARAPPEARED TO BE DOWN. HOWEVER, AFTER TOUCHDOWN, THE L WING BEGAN SETTLING, BUT THE AIRCREW KEPT THE ACFT ON THE RWY. AN EMERG EVACUATION WAS INITIATED, BUT THE SLIDE AT THE L FWD DOOR DID NOT INFLATE. AN INVESTIGATION REVEALED THE L GEAR OUTER CYLINDER, PN 65-57901-19, HAD FAILED FROM FATIGUE. A STRESS CORROSION CRACK HAD INITIATED ON THE OUTER DIAMETER OFTHE STRUT CYLINDER WHERE A STRAP HAD OBSCURED THE CORROSION. THERE WAS NO HISTORY OF A HARD LANDING. NO PRESSURE WAS FND IN THE INFLATION BOTTLE FOR THE L FWD DOOR SLIDE. NO REASON WAS FND FOR A LOSS OF PRESSURE.

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

LANDING GEAR,MAIN GEAR STRUT..STRESS CORROSION

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

LANDING GEAR,MAIN GEAR STRUT..FATIGUE

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