Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
General Evacuated
Aircraft
I was Co-Captain SIC (Second in Command) in the right seat. During taxi out for departure Runway XXR at ZZZ; one of the passengers commented about it being warm in the cabin and asked if we could cool it down. I started the APU and turned the bleed air on HI. A few minutes later we were cleared to 'line up and wait' Runway XXR. About that time I smelled something abnormal. Not like electrical or plastic smoke but oily; metallic. I turned around and observed smoke filling the cabin. [Advised ATC] and told Tower we had smoke in the cabin and needed to evacuate the aircraft. I shut down the APU; escorted the passengers off the aircraft and eventually back to the FBO. The PIC (Pilot in Command) completed the engine shutdown and emergency evacuation checklist and remained with the aircraft. The ARFF (Aircraft Rescue and Firefighting) crew confirmed no fire but residual smoke in the cabin and aft fuselage APU compartment. Recovery flight for the passengers was put in motion.
On Taxiway XX in line up to Runway XXR ZZZ; we were number 5. Passengers complained it's warm back here. The crew turned on the APU via checklist. Tower cleared [us] line up and wait. We complied; suddenly smoke filled the interior of aircraft. We the crew [advised ATC] and evacuated on Runway XXR. Ran checklists. No injuries; no damage to persons or property.
Fractional flight crew reported the cabin filled with smoke from a faulty APU prior to takeoff.