KLM Flight KL791 Emergency: Suspected Oil Leak Triggers Return to Amsterdam

The crew squawked 7700 (the general emergency code) and initiated a diversion back to Amsterdam. The suspected cause, according to aviation sources, is a suspected oil leak in one of the engines, though KLM and airport officials have not yet officially confirmed the cause .

As is standard procedure for a heavily fuelled long-haul aircraft returning shortly after departure, KL791 performed a fuel dump over the North Sea to reduce landing weight . The aircraft then landed safely on runway 27 at Amsterdam Schiphol without further incident. Emergency services were on standby as a precaution .

Date note: Multiple aviation news sources, including AirLive, TS2.tech, and The Aviation Hub, report this event as occurring on June 19–20, 2026 (depending on timezone — CEST and UTC), not June 2025 . If referring to a June 2025 event specifically, the current evidence points to this being a 2026 occurrence.

A Pattern of KLM 777 Emergencies

The KL791 incident is not isolated. KLM Boeing 777s have experienced several technical emergencies in recent years, all of which resulted in safe returns to Amsterdam:

June 23, 2024: Flight KL705 (Amsterdam → Rio de Janeiro)

On June 23, 2024, a KLM Boeing 777-200ER (registration PH-BQB) operating flight KL705 from Amsterdam to Rio de Janeiro declared an emergency and dumped fuel before returning to Schiphol . The aircraft turned around over Belgium about 40 minutes after departure. The cause was initially reported as an unspecified technical problem; later investigation identified a fault in the center left hydraulic interface module . The aircraft landed safely with no injuries .

May 17, 2025: Flight KL877 (Amsterdam → Mumbai)

On May 17, 2025, KLM flight KL877 — a Boeing 777-300ER (registration PH-BVW) — suffered a left engine fire shortly after takeoff from Amsterdam . The engine emitted loud bangs and streaks of flames; the crew shut it down and leveled off at 6,000 feet . The aircraft performed a fuel dump over the North Sea and returned safely to Schiphol . No injuries were reported. The suspected cause was a bird strike or compressor stall, though investigations were ongoing at the time . Flight tracking data showed the aircraft landed about 50 minutes after departure .

These three incidents share a common profile: technical or mechanical issues detected shortly after takeoff, a standard fuel dump procedure, and a safe return to Schiphol without injuries.

Passenger Rights Under EU261 and UK261

Passengers affected by the KL791 emergency — or any delayed or cancelled flight departing from an EU member state like the Netherlands — have clearly defined rights under EU Regulation 261/2004 (EU261) and its UK equivalent UK261 .

Immediate Rights: Care and Rebooking

• Right to care: KLM must provide meals and refreshments in proportion to the waiting time, two free phone calls, emails, or faxes, and hotel accommodation if an overnight delay is required .
• Right to reimbursement or re-routing: Passengers can choose between a full refund of the ticket (within 7 days) plus a free return flight to the point of departure, or re-routing to their final destination at the earliest opportunity .

Right to Monetary Compensation

For a flight over 3,500 km (the Amsterdam–São Paulo route is approximately 9,900 km), passengers whose arrival at their final destination is delayed by 3 hours or more may claim:

• €600 per passenger under EU261
• £520 per passenger under UK261

The 'Extraordinary Circumstances' Carve-Out

There is a critical exception. Airlines are not required to pay compensation if they can prove that the delay or cancellation was caused by 'extraordinary circumstances' that could not have been avoided even if all reasonable measures had been taken . Examples of accepted extraordinary circumstances include extreme weather, air traffic control restrictions, political instability, and strikes by non-airline staff .

Technical defects like engine oil leaks or hydraulic failures have historically been argued by airlines as extraordinary circumstances. However, regulators and courts generally view mechanical/engine defects more skeptically than truly external events. For example, the European Court of Justice has ruled that technical problems discovered during routine aircraft maintenance are not extraordinary . Whether KLM invokes this defence in the KL791 case will determine whether passengers receive monetary compensation or only care and rebooking.

Summary for KL791 Passengers

Bottom Line

The KL791 emergency, while serious, followed standard aviation safety protocols: the crew identified a suspected oil leak, declared an emergency, dumped fuel, and returned the aircraft safely to Amsterdam. No one was injured. For passengers, the key question will be whether their arrival is delayed by 3+ hours — if so, they may be entitled to significant compensation, though KLM may challenge that on the basis of extraordinary circumstances. Affected travelers should keep all documentation (boarding passes, receipts, and any communication from KLM) and consider filing a claim if the delay threshold is met.