Cpr aircraft has smoke in cockpit and cabin.

Attributes
ACN	254495
Time
Date	199310
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ama
State Reference	TX
Altitude	msl bound lower : 23500 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab
Operator	general aviation : corporate
Make Model Name	Small Transport
Flight Phase	cruise other descent other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 2500 flight time type : 25
ASRS Report	254495
Person 2
Affiliation	Other
Function	observation : passenger
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Cruising at FL250 VMC on IFR flight plan. Sudden smell of smoke and electrical odor. Approximately 15 seconds later, cabin began filling with thick white smoke. Donned air mask, turned off bleed air vents, reduced power. Attempted contact with center, and started high angle descent. Attempted to contact center again as I left altitude, was unable (oxygen mask 'microphone' switch was not on). Had passenger in right seat contact and confirm lower with center. Got approval at approximately 23500 while descending. Action plan to correct -- verify microphone switch on and would declare immediate emergency situation. Deemed failure of mechanical environment center, landed amarillo, tx, without incident or injury.

Original NASA ASRS Text

Title: CPR ACFT HAS SMOKE IN COCKPIT AND CABIN.

Narrative: CRUISING AT FL250 VMC ON IFR FLT PLAN. SUDDEN SMELL OF SMOKE AND ELECTRICAL ODOR. APPROX 15 SECONDS LATER, CABIN BEGAN FILLING WITH THICK WHITE SMOKE. DONNED AIR MASK, TURNED OFF BLEED AIR VENTS, REDUCED PWR. ATTEMPTED CONTACT WITH CTR, AND STARTED HIGH ANGLE DSCNT. ATTEMPTED TO CONTACT CTR AGAIN AS I LEFT ALT, WAS UNABLE (OXYGEN MASK 'MIKE' SWITCH WAS NOT ON). HAD PAX IN R SEAT CONTACT AND CONFIRM LOWER WITH CTR. GOT APPROVAL AT APPROX 23500 WHILE DSNDING. ACTION PLAN TO CORRECT -- VERIFY MIKE SWITCH ON AND WOULD DECLARE IMMEDIATE EMER SIT. DEEMED FAILURE OF MECHANICAL ENVIRONMENT CTR, LANDED AMARILLO, TX, WITHOUT INCIDENT OR INJURY.

Data retrieved from NASA's ASRS site as of July 2007 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.