Altimeter Accuracy
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Altimeter Accuracy
For a commercial flight, I understand that the accuracy of the altimeter should be verified during the pre-flight checks on the ground to within +50 and -75 feet.
Where do these figures come from, i.e. is it JAR, CAA, ICAO or what?
A direct reference would be helpful.
Thanks.
Where do these figures come from, i.e. is it JAR, CAA, ICAO or what?
A direct reference would be helpful.
Thanks.
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Thanks for looking, but done that. Spent about 3 hours googling for it too, before trying here...
I'd be interested to know how the figures were calculated also...
I'd be interested to know how the figures were calculated also...
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From my recollection the right seat altimeter compared with left seat altimeter shall be within 50' and each shall be within 75' of ground elevation, at PRE-START. For RVSM max diff is 200' in RVSM airspace IE above FL290.
LD Max, I went through the same evolution a few years back. All I found in documentary form was in PANS-OPS, as follows:
“A serviceable altimeter will indicate the height
of the altimeter in relation to the QFE reference point
within a tolerance of +/- 20m or 60 ft for altimeters
with a test range of 0-30K ft”
PANS-OPS Vol 1 Pt VI, Ch2 para 2.2.1.3."
I looked in JARs but discovered that the limits were in JTSOs (Joint Technical Standards Orders), but that JTSOs hadn't actually been written yet! So I felt free to rewrite our SOP according to ICAO.
There are other standards in there for altimeters with a greater range also.
“A serviceable altimeter will indicate the height
of the altimeter in relation to the QFE reference point
within a tolerance of +/- 20m or 60 ft for altimeters
with a test range of 0-30K ft”
PANS-OPS Vol 1 Pt VI, Ch2 para 2.2.1.3."
I looked in JARs but discovered that the limits were in JTSOs (Joint Technical Standards Orders), but that JTSOs hadn't actually been written yet! So I felt free to rewrite our SOP according to ICAO.
There are other standards in there for altimeters with a greater range also.
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