Refer to figure.
Electrical fires are often indicated by a smell of burning insulation and/or acrid smoke.

The most important consideration is maintaining safe flight conditions while investigating the cause.

It is crucial to switch off all unnecessary electrical equipment right after a meticulous detection of the source of the electrical fire by the following procedure:

• Electrical sources in a row:
  • Switch OFF
  • Observe for any improvement
    • “OFF” If smell diminishes;
    • “ON” if nothing changes.

Suppose the source of the smoke or fire cannot be positively identified and the equipment electrically isolated. In that case, the pilot shall carry out the following typical procedure, which prepares the crew to continue for the remaining flight time till landing with stby electrical source:

• Generator or Alternator (1 and/or 2) switch OFF;
• Battery switch OFF;
• Open windows to ventilate the cockpit (if operation conditions permit)
• LAND AS SOON AS POSSIBLE, and if the situation becomes unmanageable, LAND IMMEDIATELY.

Instead of switching off the Generator or Alternator and Battery, the pilot can use the master switch which allows isolating all electrical power using systems from the source of power.