Instructor reported an near midair collision event during descent for landing.

Attributes
ACN	1741366
Time
Date	202004
Local Time Of Day	0601-1200
Place
Locale Reference	HUM.Airport
State Reference	LA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Visual Approach
Flight Plan	None
Aircraft 2
Make Model Name	Helicopter
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	None
Person 1
Function	Instructor
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 3000 Flight Crew Type 500
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy Deviation - Procedural Clearance
Miss Distance	Horizontal 200 Vertical 100

Narrative:

VFR multi engine training flight with CFI and one student day VFR. Hum tower was called on the radio in a descent. Both pilots did not observe yellow/black helicopter aircraft Y in same general direction to hum airport. Helo took no evasive action and continued straight and level flight path. CFI took evasive action. Helo called hum tower after close call; it may have been that the helo was speaking to new orleans approach (this is unknown) at time of incident. Aircraft X had been on tower frequency the entire flight in the vicinity of class D airspace around hum. Tower never reported any traffic prior to incident.

Original NASA ASRS Text

Title: Instructor reported an NMAC event during descent for landing.

Narrative: VFR multi engine training flight with CFI and one student day VFR. HUM Tower was called on the radio in a descent. Both pilots did not observe yellow/black helicopter Aircraft Y in same general direction to HUM airport. Helo took no evasive action and continued straight and level flight path. CFI took evasive action. Helo called HUM Tower after close call; it may have been that the helo was speaking to New Orleans Approach (this is unknown) at time of incident. Aircraft X had been on Tower frequency the entire flight in the vicinity of Class D airspace around HUM. Tower never reported any traffic prior to incident.

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.