SA227AT pilot reported diverting to an alternate airport after observing a wing overheat message.

Attributes
ACN	1542828
Time
Date	201805
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	SA-227 AC Metro III
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Component
Aircraft Component	Ice/Rain Protection System Indicating & Warning
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument Flight Crew Commercial Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

[While] enroute I experienced a steady wing overheat annunciator. Immediately performed memory items followed by the emergency QRH checklist. The annunciator did not extinguish after 2 minutes and 30 seconds; as per the QRH I performed a pre-planned engine shutdown. I immediately notified center of the problem; and diverted to [a suitable alternate]; landing with one engine running. No further problems ensued. The plane had previously been encountering a left steady wing overheat annunciator before I left [departure airport]. However after a fix the plane checked out normally.

Original NASA ASRS Text

Title: SA227AT pilot reported diverting to an alternate airport after observing a wing overheat message.

Narrative: [While] enroute I experienced a steady WING OVERHEAT annunciator. Immediately performed memory items followed by the emergency QRH checklist. The annunciator did not extinguish after 2 minutes and 30 seconds; as per the QRH I performed a pre-planned engine shutdown. I immediately notified Center of the problem; and diverted to [a suitable alternate]; landing with one engine running. No further problems ensued. The plane had previously been encountering a Left Steady Wing Overheat annunciator before I left [departure airport]. However after a fix the plane checked out normally.

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.