COMPONENT MAINTENANCE MANUAL
Publication No. 051019-1 Rev H
Page 60
DOCUMENT UNCONTROLLED WHEN PRINTED
33-46-00
AS9100 Certified
23-Mar-2015
Rev B
K. Gimbal Movement Zones
WARNING: THE MECHANICAL HARD STOPS WILL BE A HAZARD UNDER SOME
CIRCUMSTANCES. REFER TO THE IMMEDIATELY FOLLOWING TEXT.
(1) The limit switches are combined with mechanical hard stops as a safety precaution in the unlikely
event that a limit switch does not stop the elevation or azimuth movement of the lamp and/or
gimbal. In order to reach these mechanical hard stops, the range of movement is extended past
the travel zone figures shown in Table 19.
(2) This additional rotation may result in the searchlight beam finally pointing at crew personnel or a
sensitive part of the aircraft thereby causing injury or damage.
(3) Figure 41 and Figure 42 illustrate the extended movement range. These angles should be taken
into account during setup if they are likely to cause the light beam to point at sensitive areas in the
case of a limit switch failure and full extended travel of the searchlight.
(4) After initialisation, the gimbal control software will calculate “soft stops” which govern the areas in
which movement can occur. There is a Slow Speed Zone close to the limit switches where
movement speed is restricted prior to reaching the “soft stop”.
NOTE: The envelope limiting positions for both azimuth and elevation are electrical
settings determined by the positioning of the mechanical hard stops during
setup.
(5) When the gimbal reaches the starting point for the Slow Speed Zone, the motor speed will begin to
decrease from 7 to 0 at which time the soft stop will have been reached.
NOTE: The soft stop is the software controlled point where gimbal movement will
normally stop after the limit switches have been set.
(6) If for some reason the gimbal continues to operate past the soft stop, the limit switch will be
activated and stop the affected gimbal motor.
NOTE: In the unlikely event that the limit switch does not activate and stop the motor
travel, the motor will continue to drive until the travel nut reaches the mechanical
hard stop. This point cannot be passed and the motor will cause an overcurrent
condition which will result in the shutdown of electrical power to the motor
circuit.
(7) Figure 41 and Figure 42 provide illustrations of the maximum positions of the limit switches and
the relative positions of the soft stops and slow speed zones for both elevation and azimuth
settings.
AIRBUS HELICOPTERS: CMM L334M6304E01 ISSUE: B PAGE 78 OF 165
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