SUPPLEMENTARY
PROCEDURES
HGS OPERATION
AIRPLANE
OPERATIONS
MANUAL
1-02-85
Page
2
Code
01 REVISION 39
AOM-145/1114
LOW VISIBILITY TAKEOFF - CONDITIONS OF
OPERATION
The low visibility takeoff display and Ground Roll Guidance Cue are
automatically provided to the pilot once the following conditions have
been established:
− Primary mode selected;
− IRS in NAV mode;
− All NAV receivers tuned to same ILS frequency;
− Runway length set between 6000 ft (1829 m) to 13500 ft
(4114 m);
− Selected heading bug set to runway heading;
− Selected course set to runway heading or approach course.
NOTE: Misleading/removal of the guidance is not annunciated. Safe
operation in this condition was demonstrated and is predicated
on the pilot’s ability to see outside visual references.
AIII MODE - APPROACH AND LANDING - CONDITIONS
OF OPERATION
The system conditions that must be met in order to achieve AIII
capability include:
− IRS in NAV mode;
− AHRS 2 in Full Performance mode;
NOTE: AHRS is not applicable in case of dual IRS
configuration.
− All reversion selections in NORMAL position;
− All NAV receivers tuned to same ILS frequency;
− Basic attitude (pitch, roll, heading) data from dual sources within
defined limits;
− All sensors/input data valid and no HGS BIT faults present;
− Radio altitude greater than 500 ft;
− Glideslope set between -2.50° and -3.00°.
AIII becomes available for selection as the active mode when the above
conditions are satisfied and the Approach On Course (AOC) logic is met.
Approach On Course is dependent on the following criteria:
− Flight Director Lateral Capture Mode indicates LOC and FD
Vertical Capture mode indicates GS;
− No Localizer and Glideslope deviation for a period of 5 seconds;
− Difference between IRS Magnetic Track and the Selected
Course 1 less than 15°.
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