bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Tue Jan 19, 2010 6:33 am Post subject: Altitude encoder |
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1/19/2010
Hello Angier Ames, You wrote: ".....it is my understanding that your IFR
equipment
must perform to minimum FAA specs, but there is no requirement that the
equipment be certified."
Why operate on just an understanding when you can go to the regulations and
determine the facts? With regard specifically to the altitude encoder here
is what 14 CFR says on this subject:
"91.217 Data correspondence between automatically reported pressure
altitude data and the pilot's altitude reference.
No person may operate any automatic pressure altitude reporting equipment
associated with a radar beacon transponder-
(a) When deactivation of that equipment is directed by ATC;
(b) Unless, as installed, that equipment was tested and calibrated to
transmit altitude data corresponding within 125 feet (on a 95 percent
probability basis) of the indicated or calibrated datum of the altimeter
normally used to maintain flight altitude, with that altimeter referenced to
29.92 inches of mercury for altitudes from sea level to the maximum
operating altitude of the aircraft; or
(c) Unless the altimeters and digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, respectively."
So now, instead of just operating on some understanding, I call it hearsay,
gossip, and rumor, we can operate on the facts. Also please see the
attachment. Please let me know if you want further clarification.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
==================================================
Time: 07:00:20 AM PST US
From: "Greenbacks, UnLtd." <N4ZQ(at)comcast.net>
Subject: AeroElectric-List: Re: Altitude encoder
I built the Rocky Mountain Instrument MicroEncoder from a kit and
although I can't say for certain, the altitude encoder portion of this
instrument may well be more accurate than a certified unit. Which gets
me to my point...., it is my understanding that your IFR equipment
must perform to minimum FAA specs, but there is no requirement that
the equipment be certified.
Angier Ames
N4ZQ
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ABEA_Minimum_Inst_Requirements_9.doc |
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