Narrative:

When we arrived to our aircraft the inbound crew notified us that they were writing up the aircraft for 'fumes/odor' in the aircraft cabin and cockpit associated with bleed 2. Upon entering the aircraft a pungent acrid electrical smell was present throughout the cabin. Contract maintenance arrived and began his flowchart which lead to starting the APU; which began to make the fumes in the cabin dissipate. At this point maintenance wanted to conduct engine runs to cycle packs and bleeds to determine the cause of the fumes. After approval from the station ops and ground control we started the #2 engine to begin idle engine runs at the gate. After starting the #2 engine the fumes which had since dissipated returned just as strong as before. We then started the #1 engine and began trying different pack and bleed combinations. We found that the #2 bleed with either pack was the causing the strongest odor. At this point maintenance decided the fumes were not normal or improving so we shut down the engines and exited the aircraft leaving the APU running while we stood in the jetbridge discussing what we would do next. The captain heard a warning message from the cockpit and ran into the cockpit at which point I noticed the emergency lights were on and the cabin lights were off. I looked into the aft cabin and saw smoke building in the aft end of the aircraft. I yelled 'smoke in the cabin' to the captain. At this point we both evacuated the aircraft making sure our flight attendants were not on board. We alerted operations who called firefighters and law enforcement. We were called back to the aircraft to release the parking brake so they could push the aircraft away from the gate.

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Original NASA ASRS Text

Title: ERJ-175 First Officer and Flight Attendant reported evacuating the aircraft after haze filled the cabin following engine pack troubleshooting.

Narrative: When we arrived to our aircraft the inbound crew notified us that they were writing up the aircraft for 'fumes/odor' in the aircraft cabin and cockpit associated with BLEED 2. Upon entering the aircraft a pungent acrid electrical smell was present throughout the cabin. Contract maintenance arrived and began his flowchart which lead to starting the APU; which began to make the fumes in the cabin dissipate. At this point Maintenance wanted to conduct engine runs to cycle packs and bleeds to determine the cause of the fumes. After approval from the station ops and ground control we started the #2 engine to begin idle engine runs at the gate. After starting the #2 engine the fumes which had since dissipated returned just as strong as before. We then started the #1 engine and began trying different pack and bleed combinations. We found that the #2 bleed with either pack was the causing the strongest odor. At this point maintenance decided the fumes were not normal or improving so we shut down the engines and exited the aircraft leaving the APU running while we stood in the jetbridge discussing what we would do next. The captain heard a warning message from the cockpit and ran into the cockpit at which point I noticed the emergency lights were on and the cabin lights were off. I looked into the aft cabin and saw smoke building in the aft end of the aircraft. I yelled 'smoke in the cabin' to the Captain. At this point we both evacuated the aircraft making sure our Flight Attendants were not on board. We alerted Operations who called Firefighters and law enforcement. We were called back to the aircraft to release the parking brake so they could push the aircraft away from the gate.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.