Passenger Eric Moody saw a faint glow on the wings. Captain Eric Moody, no relation, stepped into the cabin to inspect. The Boeing 747-200 was cruising at 37,000 feet on a moonless night. Then the St. Elmo’s fire appeared, a spectral blue light dancing on the windshield. Within minutes, all four Rolls-Royce RB211 engines failed, one after another. The smell of sulfur filled the cockpit. The 747 became a 200-ton glider, silent but for the rush of air. The crew initiated a desperate emergency descent, aiming for Jakarta’s Halim Airport.
This event mattered because it identified a new and nearly undetectable aviation hazard. The aircraft had entered a cloud of fine abrasive ash from the eruption of Mount Galunggung, 110 miles away. The ash sandblasted the windshield, clogged engine sensors, and melted inside the combustion chambers, coating turbine blades and snuffing out the flames. The crew had no warning; volcanic ash clouds do not appear on weather radar.
A common assumption is that the engines simply choked. They did, but they also later restarted. As the plane descended into denser, ash-free air, the molten silica on the turbine blades solidified and cracked off. The crew managed to restart one engine, then three more. They landed safely with one working windshield wiper and severely damaged engines.
The lasting impact was a global overhaul of volcanic ash monitoring and pilot training. The incident led to the establishment of Volcanic Ash Advisory Centers. It proved that a modern jet could lose all thrust and recover, a lesson embedded in flight manuals. The flight is known in aviation circles by its call sign: Speedbird 9.