EMB145 first officer experiences smoke entering through the cockpit vents passing FL280 during desce...

Narrative:

On our descent at approximately 28;000 ft the pilot not flying saw smoke entering the cockpit from all visible vents and below the windshield. We immediately downed our 02 masks; smoke goggles and declared an emergency. ATC gave a clearance for an emergency descent to 12;000 which was initiated promptly. We were immediately given a vector to the west directly to the closest airport. The pilot not flying was running the QRH. I; the pilot flying; noticed the inside of the windshield appeared unusual prior to the visual smoke. Much of it was covered in frost. I have never seen a windshield appear like this so quickly. After the smoke; then I suggested it could be the windshield heat. The pilot not flying then deselected the windshield heat and the smoke subsided. We landed safely. I feel as if we worked well together as a crew. All the memory items were followed and checklists were run per the QRH! Unfortunately; this is the second time I have experienced smoke in the EMB145.

Original NASA ASRS Text

Title: EMB145 First Officer experiences smoke entering through the cockpit vents passing FL280 during descent. Oxygen masks are donned and the QRH complied with before diverting to an airport closer than the destination airport.

Narrative: On our descent at approximately 28;000 FT the pilot not flying saw smoke entering the cockpit from all visible vents and below the windshield. We immediately downed our 02 masks; smoke goggles and declared an emergency. ATC gave a clearance for an emergency descent to 12;000 which was initiated promptly. We were immediately given a vector to the west directly to the closest airport. The pilot not flying was running the QRH. I; the pilot flying; noticed the inside of the windshield appeared unusual prior to the visual smoke. Much of it was covered in frost. I have never seen a windshield appear like this so quickly. After the smoke; then I suggested it could be the windshield heat. The pilot not flying then deselected the windshield heat and the smoke subsided. We landed safely. I feel as if we worked well together as a crew. All the memory items were followed and checklists were run per the QRH! Unfortunately; this is the SECOND time I have experienced smoke in the EMB145.

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.

Attributes
ACN	1162198
Time
Date	201404
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Component
Aircraft Component	Window Ice/Rain System
Person 1
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

EMB145 first officer experiences smoke entering through the cockpit vents passing FL280 during descent. Oxygen masks are donned and the QRH complied with before diverting to an airport closer than the destination airport.