Learjet 60 - Radio Altimeter

Learjet
60

Pilot's Manual
RADIO ALTIMETER
A radio altimeter is
installed to give the pilot and copilot a direct
ra-
dio height measurement from 0 to 2,500
feet AGL . The radio altitude
is automatically displayed in green
digits on both PFDswhen the ra-
dio altitude is below 2,500 feet
AGL . Changes in altitude are dis-
played by the radio altimeter
in 50-foot increments when the altitude
is above 1,000 and in 10-foot increments
when the altitude is below
1,000 feet . No tuning is required and there
are no operating controls
that affect the
radio altimeter . A self-test
function can be initiated by
depressing the
RA TEST button on either the
pilot's or copilot's Alti-
tude Awareness
Panel (AAP) . During the test
a fixed value of 50 feet
will be displayed on
both PFDs . The DH
annunciator will illuminate
during the test if the
decision height is set higher
than 50 feet . The t-
amp RADIO ALT circuit breaker
on the pilot's circuit
breaker panel
supplies 28 VDC power to the
radio altimeter .
PM-123
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