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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
B
3.2.1.A
Turn on primary aircraft power.
3.2.1.B
Adjust the DH knob on the KNI 415, KNI 416 Radar Altimeter Indicator to set
the DH but to 25 feet.
3.2.1.C
Depress the TEST button. The indicated altitude should be 50 +/- 5 feet and
the flag should come into view. The DH lamp should be out.
3.2.1.D
With the TEST button depressed, slowly increase the DH bug until the DH
lamp lights. The bug should be 50 +/- 5 feet. The lamp should be lit at all al-
titudes above 50 feet.
3.2.1.E
Release the TEST switch. The warning flag should move out of view and the
indicated altitude should be 0 feet, nominal.
3.2.2
TAXI
When taxiing to and from the ramp, the DH light is sometimes annoying. The light may
be turned off by simply pressing the DH lamp. Once off, the lamp may be turned on
again by pressing the DH lamp or pressing the TEST button, if the DH bug is set above
50 feet. Climbing past the decision height (indicated by the DH bug) arms the DH lamp
so during the approach the lamp will light upon reaching the decision height.
3.2.3
IN FLIGHT OPERATION
At normal cruise altitudes above 2000 feet, the indicator pointer is behind the mask
and the warning flag is hidden from view above 2,500 feet. A Flight Control System
(FCS) warn is applied to the auto pilot or flight director system indicating that usable
information is not available.
3.2.4
APPROACH
When the approach plates are reviewed prior to beginning the actual approach, the pi-
lot should set the DH button to the decision height altitude, and check altimeter oper-
ation as follows:
3.2.4.A
Depress the SELF TEST button and hold:
3.2.4.A.1
50 +/- 5 feet should be indicated.
3.2.4.A.2
The flag should come into view.
3.2.4.A.3
The DH lamp should light (if the DH setting is above 50 feet).
3.2.4.B
Verify that the pointer comes on scale at 2000 feet AGL by using the baromet-
ric altitude as a reference.
3.2.4.C
If the altimeter does not operate as specified above, refer to Emergency Op-
eration,
paragraph
During the actual approach, the Radar Altimeter System provides altitude and altitude
trip information to the flight control system. When the decision height is reached, the
Rev 6, June 2003
3.3.
IM 006-00104-0006.dwd
KRA 405
Page 3-2
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