AMC1 SPA.NVIS.110(b) Equipment requirements for NVIS
operations
RADIO ALTIMETER
(a) The radio altimeter should:
(1) be of an analogue type display presentation that requires minimal interpretation for both an instantaneous impression of absolute height and rate of change of height;
(2) be positioned to be instantly visible and discernable from each cockpit crew station;
(3) have an integral audio and visual low height warning that operates at a height selectable by the pilot; and
(4) provide unambiguous warning to the crew of radio altimeter failure.
(b) The visual warning should provide:
(1) clear visual warning at each cockpit crew station of height below the pilot-selectable height; and
(2) adequate attention-getting-capability for typical NVIS operations.
(c) The audio warning should:
(1) be unambiguous and readily cancellable;
(2) not extinguish any visual low height warnings when cancelled; and
(3) operate at the same pilot-selectable height as the visual warning.
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