NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-75
Page
6
Code
01
REVISION 39
COMBINER
The Combiner is a reflective optical element which visually combines
displayed flight symbology with the pilot’s view through the airplane
windscreen by reflecting the symbology image projected from the
OHU, permitting the system symbols to overlay the corresponding
features of the outside world.
It is provided with the means to adjust symbology brightness and
selecting a manual or automatic mode of brightness control. The
Combiner is attached to upper sill beam structure of the left forward
windscreen.
The Combiner has three positions: stowed, operating, and breakaway:
− Stowed: when the HGS is not in use, the Combiner may be stowed
out of the pilot’s field of view. To stow the Combiner, press the
release lever, grasp the Combiner by the edges and rotate it aft and
up to the stow position.
− Operating: when conducting HGS operations, the Combiner is
placed in the detented operating position. Press the release lever
and rotate the Combiner to the operating (detent) position.
− Breakaway: when in the operating position, the Combiner has a
breakaway feature that allows the Combiner to rotate toward the
windscreen if there is a sudden deceleration of the airplane. To
move the Combiner from the breakaway position, press the release
lever and pull the Combiner back to the operating or stow position.
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