Pitot/Static, Transponder, Altimeter, Altitude Encoder Requirements

Transponders are required to be inspected every 24 months by FAR
91.413.  If you have an altitude encoder interfaced to your transponder,
the correlation must be checked with your altimeter at the same time by
FAR 91.411.  Other information on altitude reporting systems can be found
in FAR 91.215, 91.217, 43 Appendix E, 43 Appendix F, and AC 43-6B.
Even if you only fly VFR your transponder, encoder/altimeter correlation,
and pitot/static system still must be checked by Federal Law.  Anytime
your transponder is in the ALT position, it will be sending signals to (ATC)
air traffic control, as well as, other aircraft with traffic advisory systems
telling them your altitude.  If you don't have the  altimeter/encoder
coorelation checked, your transponder may be sending them incorrect
altitude information.  This should be correct for the safety of everyone under
ATC and flying with traffic advisory systems.  

Lafayette Avionics, Inc. is a full service avionics facility, FAA Certified
Repair Station with Class I, II, III, limited instrument, and limited airframe
ratings, that can perform the required inspection for you.

Give us a call at (765) 743-3828 for information on  all  your
avionics needs.  The FAX number is (765) 743-0000.

Hoping we can be of service,


               Ron and Josh