The outside air temp (OAT) displayed on the PFD (EXP5000) on most aircraft cannot be changed from Celsius to Fahrenheit. ![][1] [1]: https://hf-files-oregon.s3-us-west-2.amazonaws.com/hdpavidynesupport_kb_attachments/2019/09-10/5739487a-e583-4f9e-93da-e907f371f1c0/image.png ...