Investigation Summary
While cruising at 10,500 feet approximately 70 miles north of Manila, a bomb located in the aircraft's lavatory exploded. The resulting structural failure was catastrophic, causing the tail section to detach from the fuselage. The aircraft subsequently broke apart in the air, scattering wreckage across a rural area near Cabanatuan. Investigators determined the cause was 'unlawful interference', noting that airport security at the time was limited, which may have allowed the device to be smuggled on board. Although theories ranging from political sabotage to a suicide bombing were considered, the specific perpetrator and motive were never officially identified.
Final Conclusions
The crash was caused by the detonation of an explosive device in the aircraft's lavatory, leading to catastrophic structural failure and in-flight breakup. The incident was officially classified as an act of unlawful interference.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Fuselage Structure
Suffered catastrophic failure and decompression following the internal explosion.
Empennage
The entire tail section separated from the aircraft due to the force of the blast.
Interesting Facts
- 01The aircraft was a Hawker Siddeley HS-748 manufactured in 1968 (Manufacturer Serial Number 1643).
- 02The explosion occurred approximately 70 miles from the destination in Manila.
- 03All 32 passengers and 4 crew members perished in the disaster.
- 04The tail section completely separated from the aircraft before the final impact.
- 05The investigation concluded the cause was a bomb, but the source was never traced.
Safety Actions & Advisories
Security Enhancement
The investigation highlighted limited airport security development at the time, leading to later improvements in passenger and baggage screening in the Philippines.