The Zenair Mono-Z CH-100 UL ZK-RTI (c/n AACA/609) was caught outside on Friday having engine power checks..
This airframe has been around since 1989 as ZK-FSH1 - see the two links below.
The marks 'DME' were applied but never officially registered.
It was re-registered as ZK-RTI on 16-01-2019 to Peter Collins who has been toiling away converting it to purpose built glider tug.
It has been re-engined with a Honda VTEC (Jaz) engine driving through an Autoflight 3G gearbox.
The cowl is still a work in progress