How often is a transponder check required?
Transponders (FAR 91. The transponder must be inspected every 24 calendar months. FAR 43 Appendix F, ATC Transponder Tests and Inspections, lists the items that must be checked. To use a transponder, it must be inspected every 24 calendar months. Transponder – Transponders are required to be inspected for accuracy and standards every 24 calendar months, if required.Transponders are required to be inspected by an FAA Certified Repair Station every 24 calendar months according to FAR 91. FAR 43 Appendix F.FAR 43 Appendix F, ATC Transponder Tests and Inspections, lists the items that must be checked. To use a transponder, it must be inspected every 24 calendar months. Additionally, the installation of or modification to a transponder must be inspected for data errors as well.Transponders are required to be inspected by an FAA Certified Repair Station every 24 calendar months according to FAR 91. FAR 43 Appendix F.