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IFR certification with 3 altimeters

turbo

turbo

Well Known Member
I have 3 altimeters. what's the regs on how many need to be certified during the IFR cert. thanks.
 
I only have two (only?) and they both get checked. Not sure if that's per regulation, or per "Why have a standby that isn't known working"?
 
I have 3 altimeters as well....Advanced Flight EFIS, G5, and a standard round gauge. Last IFR cert, the round gauge didn't make the cut and was placarded for VFR only, but the airplane was still signed off for IFR.
 
MacCool said:
I have 3 altimeters as well....Advanced Flight EFIS, G5, and a standard round gauge. Last IFR cert, the round gauge didn't make the cut and was placarded for VFR only, but the airplane was still signed off for IFR.
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With multiple altimeters this approach sure seems reasonable. I also have done this in the past, but don't know if it is consistent with the regulations given the 91.411 cited above.
 
FORANE said:
With multiple altimeters this approach sure seems reasonable. I also have done this in the past, but don't know if it is consistent with the regulations given the 91.411 cited above.
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I don't know either, but my avionics A&P seemed confident.
 
FORANE said:
With multiple altimeters this approach sure seems reasonable. I also have done this in the past, but don't know if it is consistent with the regulations given the 91.411 cited above.
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In MacCool's example BOTH were checked, but one failed and was tagged. So they know not to rely on it.

OP's question sounded to me like, "do I have to check them all" I truly hope the answer is check them all, and tag two if you must, but know their status.
 
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I also have three altimeters and all three get calibrated at the same time as the transponder check is done. Not cheap but I do enjoy the redundancy.
 
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