Return land mandated by mist smoke in cabin of light transport.

Attributes
ACN	235588
Time
Date	199303
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : cvg
Operator	common carrier : air taxi
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude landing other other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 2600 flight time type : 400
ASRS Report	235588
Person 2
Affiliation	company : air taxi
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Aircraft on maintenance reposition flight. Aircraft mechanic as passenger. On climb out of cvg, mechanic tapped me on shoulder to point out mist in cabin. Overshot assigned altitude by 300 ft. Told tower of smoke in cabin area and requested return for landing. Emergency equipment was dispatched even though no emergency was declared. Mist dissipated very quickly after it was noted. Cause was unburned fuel purged into bleed air line. No further action required.

Original NASA ASRS Text

Title: RETURN LAND MANDATED BY MIST SMOKE IN CABIN OF LTT.

Narrative: ACFT ON MAINT REPOSITION FLT. ACFT MECH AS PAX. ON CLBOUT OF CVG, MECH TAPPED ME ON SHOULDER TO POINT OUT MIST IN CABIN. OVERSHOT ASSIGNED ALT BY 300 FT. TOLD TWR OF SMOKE IN CABIN AREA AND REQUESTED RETURN FOR LNDG. EMER EQUIP WAS DISPATCHED EVEN THOUGH NO EMER WAS DECLARED. MIST DISSIPATED VERY QUICKLY AFTER IT WAS NOTED. CAUSE WAS UNBURNED FUEL PURGED INTO BLEED AIR LINE. NO FURTHER ACTION REQUIRED.

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.