2002-05-25
China Airlines
Flight CI611
Departure
Chiang Kai-shek International Airport, Taoyuan, Taiwan
Destination
Hong Kong International Airport, Hong Kong
Causation Breakdown
Recurrence Likelihood Today
Very Low
Aging aircraft audit programs now include mandatory review of historical repair records. Non-destructive testing intervals for fatigue-critical areas have been reduced. Repair specifications are strictly enforced with manufacturer sign-off.
Summary
China Airlines 611 broke apart in mid-flight 22 years after an improperly repaired tail strike left a latent structural defect. Fatigue cracks had grown undetected through decades of pressurization cycles until the fuselage skin ruptured catastrophically. All 225 aboard were killed. The wreckage was scattered across the Taiwan Strait. The accident prompted sweeping changes to aging aircraft structural audit requirements.
Cause & Investigation
Determined cause
In-flight structural breakup — metal fatigue
The Boeing 747 disintegrated at 35,000 feet over the Taiwan Strait. Investigation found the aircraft had suffered a tail strike in 1980. The repair used an undersized doubler plate that left a gap in the outer skin, creating stress concentration. Over 22 years of pressurization cycles, fatigue cracks propagated until catastrophic failure. The tail section separated first, followed by the rest of the aircraft.
Investigation body
Aviation Safety Council (ASC), Taiwan.
Timeline & Safety Improvements
Flight CI611 disaster
Boeing 747-209B operating for China Airlines. 225 fatalities, 0 survivors.
Formal investigation opened
Conducted by: Aviation Safety Council (ASC), Taiwan.
Cause determined: In-flight structural breakup — metal fatigue
The Boeing 747 disintegrated at 35,000 feet over the Taiwan Strait. Investigation found the aircraft had suffered a tail strike in 1980. The repair used an undersized doubler plate that left a gap in the outer skin, creating stress concentration. Over 22 years of pressurization cycles, fatigue cracks propagated until catastrophic failure. The tail section separated first, followed by the rest of the aircraft.
Improvement implemented
Mandatory audits of historical repair records for all aging aircraft were ordered globally.
Improvement implemented
Tail strike repair standards were tightened, requiring Boeing-approved doubler sizing in all cases.
Improvement implemented
The FAA issued Airworthiness Directives requiring inspection of all Boeing 747s with historical tail strike records.
Improvement implemented
Aging aircraft structural inspection intervals were reduced across multiple aircraft types.