Narrative:Ambient air temperatures were high - 95°F (35°C) - as the Boeing 737 was parked at Manila Airport. The air conditioning packs, located beneath the center wing fuel tank, had been running on the ground before pushback for approximately 30 to 45 minutes. The center wing fuel tank, which had not been filled since March 9, 1990, probably still contained some fuel vapors. Shortly after pushback a powerful explosion in the center fuel tank pushed the cabin floor violently upwards. The wing tanks ruptured, causing the Boeing to burst into flames. The vapors ignited probably due to damaged wiring, because no bomb, incendiary device or detonator has been found.
» Investigation Report B737-300 / PR143, 11 May 1990 Manila, Philippines (preliminary findings)
» NTSB safety recommendations A-90-100/103
Follow-up / safety actions
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not
display the exact flight path.
Distance from Manila-Ninoy Aquino International Airport to Iloilo-Mandurriao Airport as the crow flies is 451 km (282 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.