Physiological - Other; Troubleshooting; Workload
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Landed in Emergency Condition; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Diverted; General Maintenance Action; General Declared Emergency
Aircraft
About half-way into the flight; I (Pilot Flying) noticed a haze in the cockpit that was getting progressively worse and noticed a burning smell in the cockpit.  Origin unknown.  I mentioned to the Captain (Pilot Not-Flying) that I think we're getting smoke and he began to notice as well.  He called the Flight Attendant to ascertain the severity of the smoke build-up and she said she just started noticing it when we called; along with the passenger seated in 10A noticing a noise and vibration below his feet. We ran the memory items; ran the QRH; and elected to land at an enroute with direct to the airport routing under emergency authority. The smoke seemed to dissipate after 5 minutes and we landed uneventfully followed by a look-over from the Airfield Rescue and Fire Fighters (ARFF) crew. At the gate; Maintenance appeared to have found the culprit; a total mechanical failure of Pack Number 1 (the only operating pack due to Pack 2 MEL); confirming the concerns of the passenger in 10A.The threats were the smoke itself; risk of escalation to fire; and the decreased ability of the crew to communicate normally due to O2 masks.  There were no apparent errors or undesired aircraft states. As an experienced crew; I feel we handled this event properly. I had experienced a similar emergency previously and felt comfortable with every crew decision we made.
An EMB-145 crew detected a haze and burning odor in the cockpit while the Flight Attendant and passenger identified floor vibrations. An emergency was declared; the QRH completed and after landing Maintenance discovered a Pack 1 failure.