PA46 flight instructor reported descending too low on approach resulted in a low altitude alert.

Attributes
ACN	1712767
Time
Date	201912
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Conflict Ground Conflict Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

I was giving a demo instruction flight to a potential buyer of this aircraft. I was instructing and monitoring the RNAV approach. We were cleared for the approach and inside of zzzzz. The airspace and frequency was very busy. I was looking for traffic when we received a minimum vectoring altitude alert by the tower or ATC. I immediately took the controls and initiated a climb from 1;900 feet to 2400 feet (we intercepted the glide path). After landing I called the tower who told me they were only concerned as we were getting low. They stated it was 1;700 feet however when I took the controls I noted 1;900 feet on the altimeter. They advised no action would be taken. I had them call TRACON who said the where same. It was VMC when this event occurred.

Original NASA ASRS Text

Title: PA46 flight instructor reported descending too low on approach resulted in a low altitude alert.

Narrative: I was giving a demo instruction flight to a potential buyer of this aircraft. I was instructing and monitoring the RNAV approach. We were cleared for the approach and inside of ZZZZZ. The airspace and frequency was very busy. I was looking for traffic when we received a minimum vectoring altitude alert by the Tower or ATC. I immediately took the controls and initiated a climb from 1;900 feet to 2400 feet (we intercepted the glide path). After landing I called the tower who told me they were only concerned as we were getting low. They stated it was 1;700 feet however when I took the controls I noted 1;900 feet on the altimeter. They advised no action would be taken. I had them call TRACON who said the where same. It was VMC when this event occurred.

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.