A B757 first officer reported an acute burning smell with smoke or haze in the cockpit starting at a...

Attributes
ACN	1084315
Time
Date	201304
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent Initial Approach
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 230 Flight Crew Total 20000 Flight Crew Type 3000
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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.

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.