Radar Altimeter Scale


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Radar Altimeter Scale
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The RDR ALT scale is a moving tape read against a fixed lubber line. It displays radar altitude (corrected to wheels) during major mode 305, below 9,000 feet (normally not locked on until below 5,000 feet; prior to radar altimeter lock-on, the meter is “parked” at 5,000 feet). The scale ranges from zero to 9,000 feet with a scale change at 1,500 feet. Each scale on the altitude/vertical velocity indicator displays an OFF flag in the event of indicator malfunction, invalid data received at the display driver unit, or power failure (all flags appear).

Non-normal Procedures

Normal Procedures



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