A KLM Boeing 777 operating flight #KL751 returned to Amsterdam.
KLM flight #KL751 to Quito declared an emergency West of Portugal.
The Boeing 777-200ER performed a U-turn about 2 hours into flight.
The aircraft (reg. PH-BQP) took off at 10:16 from Amsterdam runway 18L and landed on runway 18R almost 5 hours later.
The crew decided to return to Amsterdam due to an engine fire indication.