A full emergency was declared at Sumburgh Airport just after 3pm involving a helicopter with 19 people on board.
The Super Puma helicopter eventually landed safely at 3.36pm. One fire appliance from Sandwick and two from Lerwick attended, but were stood down when the helicopter landed.
The fire service was unable to add any further details.
The incident comes three days after emergency services were mobilised after a full emergency was declared when a Sikorsky S-92 reported a caution light illuminated in the cockpit during a routine offshore flight. After it landed safely operator Bristow said safety was its “number one priority”.