BendixKing KXP 756 - Manual (Page 45)

44
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.
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.
Approach
When the approach plates are
reviewed prior to beginning the actual
approach, the pilot should set the DH
but to the decision height altitude, and
check altimeter operation as follows:
A. Depress the SELF TEST button
and hold:
1. 50 ±5 feet should be indicated.
2. The flag should come into view.
3. The DH lamp should light (if the
DH setting is above 50 feet).
B. Verify that the pointer comes on
scale at 2000 feet AGL by using
the barometric altitude as a
reference.
C. If altimeter does not operate as
specified above, refer to the
following section: Emergency
Operation.
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 DH
lamp lights to alert the pilot that a
decision is to be made. The DH lamp
may then be turned off by pressing the
lamp in.
Emergency Operation
Self Test Errors
A. If the altimeter does not indicate 50
± 5 feet when initiating self test,
disregard radar altimeter system.
B. Should the flag not come into view
but the indicated altitude is correct,
the altimeter system may be used.
Keep in mind that subsequent
failures will not be indicated by the
flag.
C. Failure of the DH lamp to light
during self test means the pilot
must watch the indicator closely
since the decision height will not be
annunciated.