Passengers aboard an Air Canada flight experienced a mid-air emergency that prompted a return to London Heathrow. The incident occurred shortly after the plane, Flight AC853, a Boeing 777-300ER destined for Toronto, took off from Heathrow at 8:34 am.
While cruising at 34,000 feet over the Atlantic, the flight crew detected an unusual “acrid odor,” later identified as originating from a cooling fan. As a precautionary measure, the pilots initiated a turnaround, triggering a 7700 emergency code at 9:30 am, nearly an hour post-departure.
The aircraft safely landed back at Heathrow on runway 27L at 10:02 am, with passengers disembarking at the terminal after taxiing to the gate. Subsequently, landings on the runway were momentarily halted.
Air Canada promptly arranged an alternative departure later that morning, ensuring the passengers’ continued travel plans. The airline stated that the emergency landing was due to the detected odor, emphasizing that the landing was uneventful with all 369 passengers unharmed.
When a pilot activates the 7700 emergency code, it signals to air traffic control the aircraft’s distress status and the need for priority handling. This code serves as a general distress signal for various emergencies not categorized as hijacking (7500) or radio failure (7600).
In a similar incident last month, a Ryanair flight bound for Faro from London Stansted declared an emergency shortly after take-off, diverting to Bournemouth Airport due to a medical issue onboard. The flight landed safely in Bournemouth after a swift descent following the emergency declaration.