B757 Undifferentiated or Other Model
Flight Crew Last 90 Days 230; Flight Crew Total 20000; Flight Crew Type 3000
Distraction; Physiological - Other; Workload
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
Acute burning smell and smoke/haze in cockpit; but none noted by flight attendants in the cabin; while on approach. Smelled electrical; but possibly plastic; fabric; or even burned engine or hydraulic oil in aerosol form. No evident source. Completed immediate action items and declared emergency; briefed flight attendants and Dispatch; cabin announcement; and landed normally. During final approach and landing; fumes and smoke dissipated to residual only. Neither Tower nor fire crews noted abnormalities or source; nor we taxied to the gate and deplaned normally. Fire crews inspected the inside of the aircraft; with no evident results.
A B757 First Officer reported an acute burning smell with smoke or haze in the cockpit starting at about 11;000 feet descending. The odor; possibly electric; plastic; fabric or petroleum; dissipated on short final.