B350 pilot reported receiving a taws alert.

Attributes
ACN	1743060
Time
Date	202005
Local Time Of Day	1801-2400
Place
Locale Reference	TUS.Airport
State Reference	AZ
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Super King Air 350
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	None
Person 1
Function	Captain Single Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 5000 Flight Crew Type 500
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT
Miss Distance	Horizontal 4500 Vertical 500

Narrative:

I was doing an extended downwind for traffic pattern 29R and a had an obstacle warning come from a lighted tower. I immediately turned away from the tower for a base turn and the alert stopped. The alert trigger is based on speed and altitude trends. I had the tower in sight and never perceived any collision risk based on the planned turn.

Original NASA ASRS Text

Title: B350 pilot reported receiving a TAWS alert.

Narrative: I was doing an extended downwind for traffic pattern 29R and a had an obstacle warning come from a lighted tower. I immediately turned away from the tower for a base turn and the alert stopped. The alert trigger is based on speed and altitude trends. I had the tower in sight and never perceived any collision risk based on the planned turn.

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.