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NTSB Report
July 19, 1986 · Boeing 727-225 · N8872Z
Miami, FL
Overview
Report Status
Preliminary report
Event Type
Incident
Date
July 19, 1986
Injury Outcomes
No injuries (99 uninjured)
Location
Miami, FL
Aircraft
Boeing 727-225
Tail Number
N8872Z
Operator
Eastern Air Lines
Injuries
None
Aircraft Damage
Minor
NTSB Number
MIA86IA213
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time18:11 EDT
Nearest AirportMiami International (0nm N)
Runway9R
Runway Length13000 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 727-225
Tail NumberN8872Z
Aircraft CategoryAir
DamageMinor
OperatorEastern Air Lines
Operating RulePart 121
Engines3
Engine TypeTurbofan
Engine DetailsP&W · JT8D-15 · Turbofan · 15500
Seats157
People & Injuries
Injury SummaryNo injuries (99 uninjured)
Fatal0
Serious0
Minor0
Uninjured99
Total99
Crew 1Age 46 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind140° @ 12 kt
Visibility7 sm
CeilingNone
Altimeter30.00 inHg
Observation Time22:12
Weather SourceWFAC