Accident Boeing 737-809 B-16805, Thursday 20 September 2007
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Date:Thursday 20 September 2007
Time:13:40
Type:Silhouette image of generic B738 model; specific model in this crash may look slightly different    
Boeing 737-809
Owner/operator:China Airlines
Registration: B-16805
MSN: 30636/768
Year of manufacture:2001
Fatalities:Fatalities: 0 / Occupants:
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Saga (RJFS) -   Japan
Phase:
Nature:Passenger - Scheduled
Departure airport:Taipei-Taiwan Taoyuan International Airport (TPE/RCTP)
Destination airport:Saga Airport (HSG/RJFS)
Investigating agency: ASC
Confidence Rating: Accident investigation report completed and information captured
Narrative:
During the inspection of China Air Lines flight CI7752, a Boeing 737-800, registration B-16805, a 77 cm crack in the fuselage skin was found below the aft cargo door during a transit check after landing at Saga Airport, Japan. The flight had originated in Taoyuan International Airport, Taipei, Taiwan.


Findings Related to Probable Causes
1. The plastic waste tank outlet flanges could not resist complex stresses resulting from the installation of coupling tubes of waste water system.
2. The consistence leakage of waste tank fluid was trapped in the lower level of affected area, and the concentration of Chlorine was increased by evaporating of water. It induced corrosion to the detriment of the fuselage skin. The residual strength of the skin was not of sufficient to endure the hoop-wise stress resulted from flight operation. Finally the fuselage skin fractured to a 30 in (77 cm) crack due to the overstress.

Accident investigation:
cover
  
Investigating agency: ASC
Report number: 
Status: Investigation completed
Duration:
Download report: Final report

Sources:

NTSB DCA08WA001

Revision history:

Date/timeContributorUpdates
25-Mar-2023 11:15 ASN Update Bot Added
30-Apr-2023 07:59 harro Updated

Corrections or additions? ... Edit this accident description

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