NTSB Identification: MIA86IA213.
The docket is stored on NTSB microfiche number 31805.
Scheduled 14 CFR operation of EASTERN AIR LINES,INC. (D.B.A. EASTERN AIRLINES )
Incident occurred Saturday, July 19, 1986 in MIAMI, FL
Aircraft: BOEING 727-225, registration: N8872Z
Injuries: 99 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.

FLT WAS UNABLE TO EXTEND NOSE GEAR AND A NOSE GEAR UP LANDING WAS MADE. INVESTIGATION REVEALED THE NOSE GEAR DRAG BRACE TO BE LOCKED IN THE UP POSITION. DISASSEMBLY OF THE DRAG BRACE REVEALED THE LINK ASSEMBLIES WHICH CONNECT THE LOCKING PAWLS TO THE LOCKING ACTUATOR HAD FAILED. METALLURGICAL EXAMINATION REVEALED THE LINK ASSEMBLIES FAILED DUE TO CORROSION CRACKING. CORROSION WAS CAUSED BY ELECTROLYTIC REACTION BETWEEN THE METAL IN THE BUSHING OF THE LINK AND THE METAL OF THE LINK. EXAMINATION OF THE BUSHINGS INSTALLED IN THE LINK REVEALED THE ABSENCE OF CADMIUM PLATING AND CHROMATE COATING. THE BUSHINGS WERE OBTAINED BY EASTERN AIRLINES FROM A VENDOR WHO WAS MANUFACTURING THE PART USING PLANS SUPPLIED BY EASTERN. THE EASTERN PLANS CALL FOR CADMIUM PLATING AND CHROMATE COATING.

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

LANDING GEAR,GEAR LOCKING MECHANISM..CORRODED

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

LANDING GEAR,NOSE GEAR ASSEMBLY..INOPERATIVE

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

INADEQUATE SURVEILLANCE,INADEQUATE PROCEDURE..MANUFACTURER

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

LANDING GEAR,GEAR LOCKING MECHANISM..FAILURE,TOTAL

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