732 Aviator Drive
Fort Worth, Texas 76179

Ph:   (817) 422-2714
Fax: (425) 675 0658

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North Texas
is owned and
operated by
Ferrer Aviation
Services, LLC

Copyright © 2023

Please note that we will be closed for an extended vacation starting
December 10 and will reopen on April 15....

Inquiries may be sent to: mike(at)NorthTexasAvionics.com



Please call before shipping!

At North Texas Avionics, we specialize in the repair of older, panel-mount transponders, such as the KING KT-76/78 and KT-76A/78A/76C series, NARCO AT-50/50A/150 series, COLLINS TDR-950, CESSNA RT-359A/459A/859A and many others.

Most shops refuse to work on older transponders and would rather you buy a new transponder from them. It has been our experience that many transponders can be brought back to life with a simple realignment to factory settings.

If you are not sure your transponder is working correctly, we offer flat-rate repair services that won't break the bank.

  • For $49 - We carefully inspect and bench test your transponder for proper operation and advise you of its condition. Initial testing is usually performed the same day it is received and you will be advised of its condition via email or phone.

  • For $85 - If your transponder has a problem and requires parts or repairs, we will provide you with a firm estimate and you can decide whether or not to have it repaired. Most repairs are $225 or less. If you decide to have it repaired, the repair estimate fee is waived. In some situations, we will buy your inoperative core.

  • For $125 - Assuming no repairs are required, we issue a Yellow Tag or 8130-3 Airworthiness Approval Certificate . Transponders are tested to FAR 43, Appendix F, specifications and our service satisfies the 24 month inspection requirements of 91.413(a).

  • For $225 - In addition to the above, we completely realign your transponder to manufacturer's specifications. As internal components age, their values change and cause the transponder to slowly drift out of tolerance. Many transponder problems we see are solved when the transmitter and receiver circuits are realigned.

Prices do not include shipping costs!

Encoder and/or altimeter problems? We can test and calibrate your altitude reporting equipment while evaluating your transponder. Contact us for more information and pricing.

Before you send your transponder to any repair facility, make sure they are an FAA-certified Repair Station using calibrated test equipment. Only an approved repair station can issue an FAA form 8130-3 Airworthiness Approval Certificate.



When sending avionics to us, be sure to:

  • Pack it well and use lots of bubblewrap. The front panel knobs and faceplate are very fragile and will be damaged if not packed properly. Here's what happens when you don't provide enough cushioning... click here

  • We are not responsible for items damaged in shipping! All return shipments are insured but usually DO NOT require a signature unless you specify otherwise. We are not responsible for shipments lost after the carrier shows delivery to your doorstep. FedEx/UPS/USPS tracking numbers are provided via email.

  • Be sure to include a note describing the problem or service desired.

  • Please provide your name and ship-to address, phone number and email address. We correspond primarily by email!

UPS Ground is recommended. Our shipping address is:

North Texas Avionics
732 Aviator Drive
Fort Worth, Texas 76179