C402 captain reported returning to the departure airport due to a malfunctioning turn coordinator.

Attributes
ACN	1618841
Time
Date	201902
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Cessna 402/402C/B379 Businessliner/Utiliner
Operating Under FAR Part	Part 135
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Turn/Bank Indicator
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Weather / Turbulence

Narrative:

The first officer/pilot monitoring noticed the turn coordinator was unstable and was giving us incorrect indications. After observing erratic indications and taking into consideration the weather that was at our destination; we decided to return to ZZZ. We were VMC and we were halfway to ZZZ1 when the decision to turn back was made. The weather in ZZZ1 was low visibility and so we elected to turn back and remain in VMC. We contacted ATC and got a clearance back to ZZZ. We ended up cancelling a few minutes later. Then; we let [operations control] know what the issue and plan was.

Original NASA ASRS Text

Title: C402 Captain reported returning to the departure airport due to a malfunctioning turn coordinator.

Narrative: The First Officer/Pilot Monitoring noticed the turn coordinator was unstable and was giving us incorrect indications. After observing erratic indications and taking into consideration the weather that was at our destination; we decided to return to ZZZ. We were VMC and we were halfway to ZZZ1 when the decision to turn back was made. The weather in ZZZ1 was low visibility and so we elected to turn back and remain in VMC. We contacted ATC and got a clearance back to ZZZ. We ended up cancelling a few minutes later. Then; we let [Operations Control] know what the issue and plan was.

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.