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-   -   Altitude Discrepency between G3X and G5? (https://vansairforce.net/community/showthread.php?t=170415)

Brantel 04-09-2019 06:16 PM

Quote:

Originally Posted by RONSIM (Post 1338250)
I assume either EFIS/PFD can be used at the encoder to the transponder ( I use my Dynon D10A but could use my AFS5600T) ---- do these calibration issues have an impact on the encoder?

Ron

The EFIS as an encoder always outputs whatever altitude that is displayed at 29.92inHg. So if the altimeters is out of calibration, the encoder output will be wrong as well by the same amount. Keep in mind that the resolution of the encoder protocols can be as little as 100ft so most tiny errors are not usually a problem.

Brantel 04-09-2019 06:24 PM

Quote:

Originally Posted by Carl Froehlich (Post 1338232)
Sorry - not a Garmin guy and just assumed they would make this simple.

The main point of my post stands. Do the pitot/static check with the G3X as the altimeter of record. Do whatever you want on the G5 - leave it be or whatever.

Carl

If I am not mistaken FAR 91.411 requires that “each” altimeter in the airplane be tested before use in IFR. Don’t think it matters for VFR.

Cumulo 04-10-2019 11:18 PM

A couple of related points on meeting IFR requirements.

If the , say, G5 is new, the rules give you 24 months from date of manufacture before the part 43 altimeter test is required.

The static system can be done by any airframe mechanic if he has a little equipment. This might save someone a few bucks.

r

Walt 04-11-2019 06:33 AM

Quote:

Originally Posted by Cumulo (Post 1338524)
A couple of related points on meeting IFR requirements.

If the , say, G5 is new, the rules give you 24 months from date of manufacture before the part 43 altimeter test is required.

The static system can be done by any airframe mechanic if he has a little equipment. This might save someone a few bucks.

r

I don't believe the G5 is TSO'd and I doubt most mechanics have a certified P-S tester to perform the leak test.

(c) Altimeter and altitude reporting equipment approved under Technical Standard Orders are considered to be tested and inspected as of the date of their manufacture.

John Owen 04-11-2019 07:25 AM

discrepancy
 
Hi,
I am late to this discussion but I had some offset between my AFS 5600 and G5. At my IFR check, the technician at Higginsville Avionics took them both and put them through the full calibration. Both passed but had 20-40 ft. difference. He told me that was within limits. He also explained that a guy with one altimeter always knows his altitude but a guy with two altimeters always wonders which is correct. That struck me as really funny but I got the point. My discrepancy was due to my OCD not the instruments being out of limits.

John


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