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W Computer Unit, The computerunit createsthe flight symbologyfromairplane sensordata.HGS combines airplane situationalinformation (speed,heading,pitch, roll, attitude), inertially sensed flightpathandflightpath acceleration information andguidance directed controlinputs. Integration of airplane systems information and inputs, combined withflightdata,allows thepilotto maneuver theairplane alongtheflightpath withprecise straight-
in andglide pathtracking.
Ifguidance datais beingprovidedbyAFCS, the combiner willecho AFCSdata. During a HGS-
guidedapproach, once thelocalizerandglideslopehave beencapturedandthe airplane hasdescendedbelow 2,000feet,theHGS can beselectedtoprovide thedesired typeofapproachguidance.
HGS modes are as follows:
W Primary(PRI)Mode,
PRI mode can be usedfor take-
off, cruise andlanding.
W FlightDirector(F/D)Mode, F/D mode can be usedto flyF/D-
generatedapproachguidance or to monitor acoupled approach.
W VisualMeteorologicalConditions (VMC)Mode,
VMC modeis usedforvisualapproachesandlandings withoutguidance.
Flight Crew Operating Manual MASTER
CSP A-
013
FLIGHT INSTRUMENTS Head-
Up Guidance System Vol. 1 12-
70-
2
REV 56, Jan 31/03
W ModesAI andAII, These modes are usedto manuallyflyprecision approaches.
W ModeAIII, This modeis usedforapproachandlandingsto category IIIaminima.
NOTE
The provision of data for Low Visibility Take-
offs, or Category II Operations or Category IIIa Operations does not constitute operational approval to conduct suchoperations.
W Clear (CLR)Mode, Clear modeis typically usedduringtaxito clear allsymbologyfromthecombiner.
W Test(TEST)Mode, Test modeis usedby maintenance stafftodiagnose faults, checkoutandtroubleshoot the system.
A. Combiner Symbology
DependentuponHGS mode(see “DISPLAYCRITERIA”table)the combiner willdisplay the following:
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