EASA 2022-0256

Requires replacement, and prohibits reinstallation, of the engine fire detectors. Prompted by reported occurrences of spurious engine fire warnings. Subsequent investigation results identified a manufacturing noncompliance issue on the fire detectors, which caused a shift of the detection threshold towards temperature values that are lower than specified, potentially leading to a spurious engine fire warning. When two engines on a helicopter are fitted with an affected part, an engine fire warning could occur on both engines during the same flight.