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NTSB Report
April 25, 1992 · Boeing 707-324C · HK360
Miami, FL
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 25, 1992
Injury Outcomes
No injuries (3 uninjured)
Location
Miami, FL
Aircraft
Boeing 707-324C
Tail Number
HK360
Operator
Trans Aereos Mercan Pan Am
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA92FA115
SHORTLY AFTER TAKEOFF, THE #3 ENGINE AND PYLON SEPARATED FROM THE AIRPLANE AS A RESULT OF THE FAILURE OF THE PYLON INBOARD MIDSPAR SUPPORT FITTING. THE FITTING HAD CRACKED DUE TO FATIGUE, AND HAD BEEN CRACKED FOR SOME TIME. THE POINT OF CRACKING WAS NOT VISIBLE FOR INSPECTION ON THE WING. THE FITTING IS THE SUBJECT OF FAA AIRWORTHINESS DIRECTIVE 88-24-10 AND BOEING SERVICE BULLETIN 3183 WHICH REQUIRE VISUAL INSPECTION OF THE MIDSPAR FITTING EACH 1500 FLIGHT HOURS OR 600 CYCLES. THIS INSPECTION HAD BEEN COMPLETED ON THE FAILED FITTING ON JANUARY 2, 1992, 821 FLIGHT HOURS AND 328 CYCLES BEFORE THE FAILURE.
NTSB Probable Cause
FAILURE OF THE #3 ENGINE PYLON INBOARD MIDSPAR SUPPORT FITTING DUE TO FATIGUE CRACKING WHICH RESULTED IN THE SEPARATION OF THE NUMBER THREE ENGINE AND PYLON. CONTRIBUTING TO THE ACCIDENT WAS THE INADEQUATE INSPECTION REQUIREMENTS OF THE MANUFACTURER AND THE FAA TO DETECT CRACKS IN THE MIDSPAR FITTING.
Full Narrative
SHORTLY AFTER TAKEOFF, THE #3 ENGINE AND PYLON SEPARATED FROM THE AIRPLANE AS A RESULT OF THE FAILURE OF THE PYLON INBOARD MIDSPAR SUPPORT FITTING. THE FITTING HAD CRACKED DUE TO FATIGUE, AND HAD BEEN CRACKED FOR SOME TIME. THE POINT OF CRACKING WAS NOT VISIBLE FOR INSPECTION ON THE WING. THE FITTING IS THE SUBJECT OF FAA AIRWORTHINESS DIRECTIVE 88-24-10 AND BOEING SERVICE BULLETIN 3183 WHICH REQUIRE VISUAL INSPECTION OF THE MIDSPAR FITTING EACH 1500 FLIGHT HOURS OR 600 CYCLES. THIS INSPECTION HAD BEEN COMPLETED ON THE FAILED FITTING ON JANUARY 2, 1992, 821 FLIGHT HOURS AND 328 CYCLES BEFORE THE FAILURE.
Flight
Event TypeAccident
Event Time18:15 EDT
Nearest AirportMiami International (1nm S)
Runway9R
Runway Length13002 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 707-324C
Tail NumberHK360
Aircraft CategoryAir
DamageSubstantial
OperatorTrans Aereos Mercan Pan Am
Operating RulePart 129
Engines4
Engine TypeTurbofan
Engine DetailsP&W · JT3D-3B · Turbofan · 17000
Seats9
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 36 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 7 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point70 F
Altimeter29.00 inHg
Observation Time22:22
Weather SourceWFAC