On 10 June 1990, British Airways Flight 5390 suffered a catastrophic structural failure when a cockpit windshield blew out at 17,300 feet, partially ejecting the captain into the slipstream. Through quick-thinking crew coordination and exceptional airmanship, the first officer landed the aircraft safely at Southampton Airport with zero fatalities. This incident transformed global maintenance protocols and remains a masterclass in crisis response.
The Sequence of Events on Flight 5390
The scheduled flight from Birmingham to Málaga, Spain, began normally. A BAC One-Eleven 436GD carried 81 passengers and six crew members. At 08:33 BST, as the aircraft climbed through 17,300 feet over Oxfordshire, the forward starboard windscreen separated violently from its frame.
The immediate result was an explosive decompression. The sudden pressure differential ripped the cockpit door off its hinges, filled the flight deck with dense condensation and debris, and blew the captain, Alastair Atcheson, halfway out of the window frame. His legs became jammed around the control column, inadvertently pushing the nose down and accelerating the aircraft into a rapid dive through busy airspace.
Cabin Crew Manager Nigel Ogden heard the deafening roar of decompression and rushed into the cockpit. Finding the captain trapped halfway outside with his face pressed against the window frame and arms flailing in the sub-zero slipstream, Ogden grabbed the captain's belt and legs. Despite freezing winds and fierce pressure trying to pull the captain out, Ogden held on, his arms rapidly losing sensation and his skin freezing.
Maintenance Errors and the AAIB Investigation
The Air Accidents Investigation Branch launched an exhaustive inquiry into why the windscreen failed. The findings exposed a dangerous breakdown in quality control during a maintenance shift less than 24 hours before the flight.
The shift engineer had replaced the windscreen himself rather than delegating the task. He selected securing bolts from bins in the maintenance store by eye rather than consulting the Illustrated Parts Catalog.
- Incorrect Diameter: Eighty-four bolts secured the windscreen frame. The engineer used bolts that were 0.026 inches too small in diameter for 84 of the holes.
- Counter-sunk Head Errors: Two previous bolts were also incorrect, being shorter than specified.
- Visual Inspection Flaw: The engineer failed to notice that the replacement bolts did not match the technical drawings. The counter-sunk head bolts were too small, allowing them to pull through the holes under cabin pressure.
The investigation highlighted that maintenance procedures relied too heavily on visual estimation without independent cross-checks or proper parts verification. This single oversight nearly cost human lives.
The Cockpit Battle and Safe Descent
While Nigel Ogden held Captain Atcheson, First Officer John Heward took control of the aircraft. The deafening wind noise made radio communication nearly impossible, forcing Heward to fly manually while attempting to interpret broken radio transmissions from Air Traffic Control.
Heward engaged the autopilot briefly while managing speed brakes to slow the aircraft down from its dangerous descent rate. Other cabin crew members, including Purser Uta Thomsen, rushed to the flight deck to assist. They secured Ogden to the structural fittings so he wouldn't slip, allowing him to maintain his grip on the captain for the duration of the flight.
Heward initiated a descent to a lower, breathable altitude and requested priority handling from air traffic controllers at Southampton Airport. Despite severe control difficulties and frozen instruments, Heward executed a textbook visual approach. At 08:55 BST—just 22 minutes after the window blew out—the aircraft touched down safely.
Lasting Impacts on Global Aviation Safety
The miracle of Flight 5390 triggered sweeping reforms across commercial aviation. Regulatory bodies and airlines re-examined every link in the maintenance chain.
- Dual-Person Verification: Critical structural components now require independent sign-offs by multiple qualified technicians before a release-to-service is granted.
- Part Number Control: Maintenance facilities overhauled parts-bin storage systems to prevent undersized or unverified hardware from reaching flight-critical areas.
- Crew Resource Management (CRM): Training programs updated their modules to emphasize how cabin and flight crews must integrate during simultaneous mechanical and medical emergencies.
You can read more about ongoing aviation safety measures via the Civil Aviation Authority.
Frequently Asked Questions
Did the captain survive the incident?
Yes. Despite suffering severe frostbite, shock, bruising, and a fractured arm and wrist from being battered against the aircraft frame, Captain Atcheson survived and returned to flying duties within five months.
How did the windshield stay attached on one side?
The windscreen was installed from the outside inward, meaning cabin pressure should have pressed it tighter against the frame. However, because the securing bolts were too thin and undersized, the pressure forced the bolts outward through the holes, popping the glass outward into the slipstream.
What happened to the maintenance engineer?
The AAIB report criticized the shift engineer's casual approach to parts selection. While criminal charges weren't filed, the maintenance facility instituted strict structural audits and procedural overhauls to ensure identical oversights could never recur.
How fast was the aircraft flying when the window failed?
The aircraft was climbing through 17,300 feet at approximately 300 knots indicated airspeed when the structural failure occurred.
