FAA 2020-03-50 (Emergency)

Requires disconnecting and removing the headset amplifier and microphone interface circuit card assemblies for the 3.5 mm audio and microphone jacks. Prompted by a cabin fire incident that occurred recently on an SF50 during ground operations. A subsequent investigation determined the probable root cause was a malfunction of the headset amplifier (P/N 38849-001) and the microphone interface (P/N 35809-001) circuit card assemblies for the 3.5 millimeter audio and microphone jacks. This malfunction can result in an electrical short and subsequent uncontained cabin fire without activating circuit protection.