NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-75
Page
12
Code
01
REVISION 39
AOM-145/1114
COMBINER ALIGNMENT
During an IMC or VMC approach, it is expected that the final approach
will be completed visually. The proper mechanical alignment of the
Combiner is critical during visual operations. The Combiner’s
operating position is monitored by a Combiner Alignment Detector
(CAD) to determine if the Combiner is within allowable position
tolerances while in the IMC or VMC mode. If its position is outside
specified tolerances, an “ALIGN HUD” annunciation is displayed on
the Combiner. For Combiner alignment, push it forward slightly out of
the operating position and allow the Combiner to return to its position.
Alternatively, apply slight pressure either fore or aft on the Combiner
until the annunciation is removed.
UNUSUAL ATTITUDE
The HGS Unusual Attitude display is designed to aid the pilot in
recognition of and recovery from unusual attitude situations. The
Unusual Attitude (UA) symbology is automatically activated or
deactivated based upon the attitude of the airplane. When activated,
the UA display replaces the currently selected operation mode
symbology. The UA display is not annunciated on the HCP, that
continues to display the currently selected operational mode which will
be re-activated once the airplane is returned to a normal attitude.
The UA symbology is automatically activated under any of the
following conditions.
− The FGS changes to the unusual attitude display mode;
− Pitch angle less than -20º or greater than +30º;
− Roll angle less than -65º or greater than +65º.
TCAS RESOLUTION ADVISORY
TCAS Resolution Advisories (RA) alert the pilot regarding conflicting
air traffic by indicating a potential threat (Preventive Advisory) or
threats that require a vertical evasive maneuver (Corrective Advisory)
in order to maintain safe vertical separation. The HGS provides TCAS
Resolution Advisories from the TCAS computer that correspond with
the indications displayed on the head down Traffic Advisory/Vertical
Speed Indicator (TA/VSI).
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