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6 – i ndex
Visibility:
Visibility for aeronautical purposes is thegreater of:
• thegreatest distance atwhich ablack object of suitable
dimensions, situatednear theground, canbe seenand recognised
whenobserved against abright background; or
• thegreatest distance atwhich lights in the vicinityof 1000
candelas canbe seen and identifiedagainst anunlit background.
Visual (ATCusage):
UsedbyATC to instruct apilot to see and avoid
obstacleswhile conductingflight below theMVAorMSA/LSALT.
Visual (Pilotusage):
Usedby apilot to indicate acceptanceof
responsibility to seeand avoidobstacleswhileoperatingbelow the
MVAorMSA/LSALT.
VisualApproachSlope IndicatorSystem (VASIS):
A system
of lights so arranged as toprovide visual information topilots on
approachof their position in relation to theoptimum approach slope
for aparticular runway.
Vs1g:
Theone-g stall speed atwhich the aeroplane candevelopa lift
force (normal to theflight path) equal to itsweight.
Way-point:
A specifiedgeographical locationused todefine anarea
navigation routeor theflight pathof an aircraft employingarea
navigation.Way-points are identified as either:
• Fly-byWay-point: Away-pointwhich requires turn anticipation
toallow tangential interceptionof thenext segment of a routeor
procedure, or
• FlyoverWay-point: Away-point atwhicha turn is initiated inorder
to join thenext segment of a routeor procedure.
definitions