The captain of a beech 1900 reported several engine compressor stalls during a training flight.

Attributes
ACN	1353044
Time
Date	201605
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	Marginal
Light	Night
Aircraft 1
Make Model Name	Beech 1900
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turbine Engine
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

While conducting a training flight we were conducting stall maneuvers. The first one was a departure stall. When the first officer reduced power a momentary compressor stall occurred between 1000 and 500 [ft-pounds of torque] (left engine). Engine did not flame out. We terminated the training flight and was given clearance to descend to 8000 ft. I began the descent and upon power reduction the left engine had another compressor stall this time with a bright white flash outside the capt side window coming from the exhaust area right side. We decided to [advise ATC] and return to [departure airport]. At approximately 4000 ft another stall/white flash was seen at approximately 800 [ft-lbs of torque]. The auto ignition had been armed by this point. Landed and crash fire rescue equipment noted smoke coming from left engine during taxi.

Original NASA ASRS Text

Title: The Captain of a Beech 1900 reported several engine compressor stalls during a training flight.

Narrative: While conducting a training flight we were conducting stall maneuvers. The first one was a departure stall. When the FO reduced power a momentary compressor stall occurred between 1000 and 500 [FT-LBS of Torque] (LEFT Engine). Engine did not flame out. We terminated the training flight and was given clearance to descend to 8000 ft. I began the descent and upon power reduction the left engine had another compressor stall this time with a bright white flash outside the capt side window coming from the exhaust area right side. We decided to [advise ATC] and return to [departure airport]. At approximately 4000 ft another stall/white flash was seen at approximately 800 [Ft-Lbs of Torque]. The auto ignition had been armed by this point. Landed and CFR noted smoke coming from left engine during taxi.

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.