AMC1 ACNS.D.AC.020 Altitude source
ED Decision 2013/031/R
(a) Altimeters compliant with JAA TGL No 6 are an approved and acceptable means of compliance for the altitude source.
(b) Altimeters with a pressure altitude resolution lower than or equal to 7,62 m (25 ft) is an approved and acceptable means of compliance.
Note: Altitude source resolution of 7,62 m
(25 ft) or better is required for aeroplanes intended to be used for
international air transport as defined in ICAO Annex 6 Part 1 — 6.19.
(c) An altimeter with a pressure altitude resolution lower than or equal to 30 m (100 ft) and greater than 7.62 m (25 ft) is an approved and acceptable means of compliance for aircraft provided that the flight deck interface provides a means to inhibit the transmission of pressure altitude information for aircraft equipped with Gillham encoded altitude
Note:
It is not recommended to install altimeters with a Gillham altitude encoder
interface.
(d) Manual or automatic selection of the altitude source are acceptable means of compliance
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