B737-300 flight crew has smoke in cockpit; emergency declared.

Attributes
ACN	690379
Time
Date	200603
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 19000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 255 flight time total : 15000 flight time type : 12000
ASRS Report	690379
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 250 flight time total : 4600 flight time type : 1600
ASRS Report	690380
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Smoke in cockpit. Emergency declared with center and proceeded direct to ZZZ. Checklist accomplished and smoke stopped coming into cockpit. Supplemental information from acn 690380: in descent passing FL200; both pilots noticed 'hot' smell in cockpit. No abnormal instruments. Shortly after; I noticed smoke coming from under instrument panel; center pedestal. Donned masks; declared ife. Ran smoke in cockpit checklist. Smoke dissipated after turning off GPWS/WX panel; smell persisted. Decided to land ZZZ due to familiarity with field and solid undercast covering any other possible airfields.

Original NASA ASRS Text

Title: B737-300 FLT CREW HAS SMOKE IN COCKPIT; EMER DECLARED.

Narrative: SMOKE IN COCKPIT. EMER DECLARED WITH CTR AND PROCEEDED DIRECT TO ZZZ. CHKLIST ACCOMPLISHED AND SMOKE STOPPED COMING INTO COCKPIT. SUPPLEMENTAL INFO FROM ACN 690380: IN DSCNT PASSING FL200; BOTH PLTS NOTICED 'HOT' SMELL IN COCKPIT. NO ABNORMAL INSTS. SHORTLY AFTER; I NOTICED SMOKE COMING FROM UNDER INST PANEL; CTR PEDESTAL. DONNED MASKS; DECLARED IFE. RAN SMOKE IN COCKPIT CHKLIST. SMOKE DISSIPATED AFTER TURNING OFF GPWS/WX PANEL; SMELL PERSISTED. DECIDED TO LAND ZZZ DUE TO FAMILIARITY WITH FIELD AND SOLID UNDERCAST COVERING ANY OTHER POSSIBLE AIRFIELDS.

Data retrieved from NASA's ASRS site as of January 2009 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.