Investigation Summary
The bombing was a 'test run' for the Bojinka plot, a large-scale terrorist plan to destroy multiple transpacific airliners. Ramzi Yousef boarded the first leg in Manila under the alias 'Armaldo Forlani'. He smuggled bomb components, including liquid nitrocellulose, a modified Casio watch timer, and batteries hidden in his shoe heels, past airport security. During the flight, he assembled the device in the lavatory and placed it in the life vest pocket under seat 26K. Yousef disembarked in Cebu, and the aircraft (a Boeing 747-283BM Combi, serial number 21575, which first flew on February 17, 1979) continued toward Tokyo with a new passenger, Haruki Ikegami, occupying seat 26K. The bomb detonated four hours later while the aircraft was at 33,000 feet near Minamidaito Island. The explosion killed Ikegami and blew a hole in the floor, severing control cables in the ceiling for the right aileron and damaging the steering linkages for both the Captain and First Officer. Captain Eduardo Reyes discovered that the aircraft would not respond to control wheel inputs. By utilizing differential engine thrust, the crew managed to turn the aircraft and descend, eventually landing safely at Naha Airport.
Final Conclusions
The investigation determined the explosion was caused by a micro-bomb containing liquid nitrocellulose. The device was intentionally placed to target the aircraft's center fuel tank, but due to the specific configuration of this airframe (formerly operated by SAS), seat 26K was located forward of the fuel tank, preventing a catastrophic mid-air breakup. The successful recovery of the aircraft was attributed to the crew's exceptional airmanship in using engine power to compensate for the loss of flight control surfaces.
Photographic Evidence (1)
Video Analysis
Extensive Damage In The Cabin! | Philippine Airlines 434 — A detailed look at the bombing of PAL 434, the damage to the Boeing 747's control systems, and the crew's emergency landing in Okinawa.
If playback is blocked, the owner has disabled embedding — use the link above.
Airframe & Maintenance
Systems & Failure Modes
Aileron Control Cables
The explosion severed the mechanical cables connecting the cockpit to the ailerons, leaving the pilots unable to roll the aircraft using the control yoke.
Differential Thrust
The crew used varying power settings between the left and right engines to create a yaw moment, which induced a roll to steer the aircraft toward Okinawa.
Interesting Facts
- 01The bomb was a test run for the Bojinka plot, which aimed to blow up 12 airliners over the Pacific.
- 02The perpetrator, Ramzi Yousef, was also responsible for the 1993 World Trade Center bombing.
- 03The aircraft survived because seat 26K was not directly over the fuel tank in this specific 747-200 configuration.
- 04The explosion severed the control cables for the right aileron and the steering linkages for both pilots.
- 05The victim, Haruki Ikegami, was the only fatality; 10 other passengers were injured.
- 06The aircraft (SN 21575) first flew on February 17, 1979, and was previously operated by SAS as 'Knut Viking'.
Safety Actions & Advisories
Enhanced Liquid Screening
The incident highlighted the threat of liquid explosives, eventually leading to global restrictions on liquids, aerosols, and gels in carry-on luggage.
Improved Security Screening
Security protocols were updated to better detect non-metallic bomb components, such as those hidden in footwear or electronic devices.