Aviation safety investigations & reports

Runway excursion - Boeing Co 747-438, VH-OJH, Bangkok Airport, Thailand, 23 September 1999

Investigation number:
Status: Completed
Investigation completed


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The aircraft overran the end of runway 21L after landing. The runway was wet from very heavy rain. The crew had flown the approach with flaps 25 selected, and had intended to select idle reverse thrust after touchdown.

The aircraft encountered very heavy rain on late final approach and deviated above the glideslope. Just before touchdown, the captain instructed the first officer (the flying pilot) to go around. As thrust was being increased, the main wheels contacted the runway. The captain then retarded the thrust levers and the crew commenced manual braking about 7 seconds later. Reverse thrust was not selected.

Touchdown occurred about 1,000 m along the runway and the aircraft entered the overrun at 88 kts. Partial dynamic hydroplaning had occurred during the landing roll. This, along with the absence of reverse thrust, reducing the stopping forces available to slow the aircraft.

The aircraft nose landing gear and one main landing gear separated during the overrun sequence.

The captain ordered a precautionary disembarkation of the aircraft about 20 minutes after it came to rest.

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General details
Date: 23 September 1999   Investigation status: Completed  
Time: 1647 hours UTC    
Location: Bangkok, Airport, Thailand    
State: International   Occurrence type: Runway excursion  
Release date: 26 April 2001   Occurrence category: Accident  
Report status: Final   Highest injury level: Minor  
  Crew Passenger Ground Total
Minor: 0 38 0 38
Total: 0 38 0 38
Last update 20 March 2015