BE400 first officer reported smoke in the cabin that resulted in a return to the departure airport.

Narrative:

After having maintenance performed; departed on IFR flight plan. On climbout rh pitot heat fail annunciated. Climbing through 8000 ft second in command (sic)/pilot flying (PF) noted hot; burning smell. After brief discussion crew noted smoke visible in beam of light from passenger reading lamp in cabin. Smoke was acrid in odor; whitish/light grey and similar in density to cigarette smoke in appearance; and caused no burning sensation or vision issues. Crew stopped climb at 14;000 ft. Sic/PF donned oxygen mask and pilot in command (PIC)/pilot not flying (PNF) investigated cabin for approximately 45 seconds for source of smoke. PIC/PNF could not isolate source of smoke and returned to flight deck. Crew elected to return to [departure airport].PIC took over PF duties; [advised ATC]; and initiated descent to 9000 ft. Sic calculated landing performance and worked checklist. Descending through 12000 ft bleeds were selected off. Smoke seemed to dissipate as descent continued.ATC approach coordinated support to meet crew at ZZZ; and crew performed an uneventful visual approach.the following morning; cause of smoke was determined to be cabin temperature control set to manual/full increase by maintenance crew. Rh pitot heat circuit breaker (circuit breaker) was found tripped and was reset. Maintenance check flight was uneventful and airplane was returned to service.

Original NASA ASRS Text

Title: BE400 First Officer reported smoke in the cabin that resulted in a return to the departure airport.

Narrative: After having Maintenance performed; departed on IFR flight plan. On climbout RH pitot heat fail annunciated. Climbing through 8000 ft Second in Command (SIC)/Pilot Flying (PF) noted hot; burning smell. After brief discussion crew noted smoke visible in beam of light from passenger reading lamp in cabin. Smoke was acrid in odor; whitish/light grey and similar in density to cigarette smoke in appearance; and caused no burning sensation or vision issues. Crew stopped climb at 14;000 ft. SIC/PF donned oxygen mask and Pilot in Command (PIC)/Pilot Not Flying (PNF) investigated cabin for approximately 45 seconds for source of smoke. PIC/PNF could not isolate source of smoke and returned to flight deck. Crew elected to return to [departure airport].PIC took over PF duties; [advised ATC]; and initiated descent to 9000 ft. SIC calculated landing performance and worked checklist. Descending through 12000 ft bleeds were selected OFF. Smoke seemed to dissipate as descent continued.ATC approach coordinated support to meet crew at ZZZ; and crew performed an uneventful visual approach.The following morning; cause of smoke was determined to be cabin temperature control set to Manual/full increase by maintenance crew. RH Pitot heat Circuit Breaker (CB) was found tripped and was reset. Maintenance check flight was uneventful and airplane was returned to service.

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	1504721
Time
Date	201712
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Beechjet 400
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	Aircraft Heating System
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 70.6 Flight Crew Total 1136 Flight Crew Type 27.7
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor