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-   -   Skyview Xponder 24 months inspection (https://vansairforce.net/community/showthread.php?t=127281)

noelf 07-04-2015 10:52 AM

JP, your transponder need to be checked every 2 years and a logbook entry made. If you have not had this done, then the shop will want to pull the transponder and record the part number, model number, and serial number before the transmitter check.

For a VFR check, the test is quite simple and can be accomplished in about 30 minutes. The shop will verify the the altimeter and transponder are indicating the same value, +/- the tolerance allowed. This test is performed with the altimeter baro set to 29.92

An IFR test is a lot longer and also requires a static system check and altimeter test up to the max altitude the altimeter is certified.

The cost is usually a fixed price regardless of how long it takes. Additional cost may be incurred if problems are found and the shop has to fix something.

RFSchaller 07-04-2015 11:15 AM

When our local FBO started installing ADS-B units some of the customers had problems with th IN portion. The avionics tech told me he was able to confirm the OUT functionality by requesting a report from the FAA since the OUT information is apparently recorded. - Big Bro is watching!😳

newamiga 07-07-2015 06:52 PM

At least for the guy here at airport, he says there is no such thing as just a VFR check and that in order to verify that the encoder is putting out accurate data, he has to check the pitot system to ensure it is in fact reporting accurate data with no leaks. I get his logic, I don't agree that it is the only way to test it as there are plenty of folks who do VFR only checks. Interestingly, a second shop in the Denver area charges the same thing he does for a true VFR only check as he does for an IFR check.

He also says that the RV-12 with the traditional Vans pulled rivet static source is not sat and likely wouldn't pass. Of course there are literally thousands of them flying with that.

Just an interesting perspective from one repair station. The guy is very nice and very good.

Carl

Walt 07-07-2015 07:36 PM

The below is from the FAQ page on my website, all I can say is some repair stations like to make up their own rules.

What inspections are required for VFR operations? (sometimes referred to as a "VFR check")

The aircraft transponder must be certified every 24 months in accordance with the requirements of CFR. 91.413. Transponder testing is accomplished in accordance with Part 43 Appendix F.

For new certifications or if the encoder or altimeter has been replaced, a Data Correspondence Check must be accomplished to ensure the altitude data transmitted to ATC corresponds to within 125 feet of the altimeter normally used to maintain flight altitude per CFR 91.217.

(I will add that the "data correspondance" check when the altimeter and encoder data are derived from the same source, like an ADAHRS, is still technically required but only because the outdated reg has never been changed to reflect the new technology).

turbo 07-08-2015 02:42 PM

walt, i have a short question. if a vfr ship has transponder with no encoder, does it need a vfr check? thanks.

Walt 07-08-2015 02:54 PM

Quote:

Originally Posted by turbo (Post 996604)
walt, i have a short question. if a vfr ship has transponder with no encoder, does it need a vfr check? thanks.

Yes, if you turn on the xpdr then it's required to be checked regardless.
(Anywhere a transponder is "required" also requires you have mode C altitude reporting)


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