From the web:
S-92 Incidents
Thursday November 9th we experienced a return flight due to indication failure in the engine fire detection system. NOR 546 departed Flesland at 14:42 local time enroute for Gullfaks A, with 18 passengers and 2 crew.
At 15:20 the fire warning light for engine 1 started to flash intermittently. Based on similar incidents lately the crew rapidly concluded that this was an indication of false warning. However, knowing that the engine fire detection system was not working properly the crew elected to abort the flight and return to Bergen for technical investigation.
Air Traffic Control was informed about the indication failure and clearance was obtained to return to maintenance base at Flesland. The rest of the flight back to Flesland was carried out as normal. It has to be emphasized that not any kind of priority or emergency was declared by the crew and it was purely considered as a "technical return to base" situation and the passengers were briefed accordingly. It was a surprise to the crew to discover that the airport authority had raised the emergency preparedness to "full alert" on arrival at Flesland at 15:37.
Passengers were disembarked upon arrival and escorted to the terminal where they received a detailed briefing by the crew. Passengers awaiting other S-92 departures received briefing from our Chief Pilot S-92.
Norsk Helikopter has during the last months experienced three (3) incidents related to the engine fire detection system. All three incidents has been generated by indication failure in the fire warning system for the engines. Based on these incidents Norsk Helikopter introduced an internal inspection procedure of all sensors in the system on 50 hours interval. The manufacturer, Sikorsky Aircraft has been consulted on the failures and a investigation team is arriving in Stavanger tomorrow to review and inspect the failed parts (sensors).
We as operator has full confidence in the Sikorsky S-92 product that we are operating and as fleet leader, we will by November 20th pass the threshold of 10.000 revenue hours on our total S-92 fleet.
However, the failures we have experienced in the engine fire warning system is not acceptable and we will together with Sikorsky Aircraft and Vendors do our outmost to ensure that this is rectified and proper corrective actions implemented immediately.
We ensure you all that Safety in our operations is our number one objective and it will always be