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Glideslope mode is automatically selected when in an approach mode, inbound, with a valid localizer as the lateral navigation source. Glideslope mode is automatically cleared by the loss of approach mode. When armed, glideslope mode is also cleared by turning outbound, or by the loss of a valid localizer as the lateral navigation source. When captured, glideslope mode is cleared by changing the source of the lateral navigation signal to an invalid localizer.
Glideslope arming is annunciated with a white GS message in the vertical arm field on the PFD. Glideslope capture is annunciated with a green GS message in the vertical capture field on the PFD.
(8) VerticalGo-AroundMode
Go-around mode generates a 10-degree pitch-up command.
Selectionofvertical go-around mode turns onbothflight directors, disengages autopilot, clears all other vertical modes and switches the flight guidance commands to a dual-independent configuration. Vertical and lateral modes are coincident.
When a go-around causes the autopilot to disengage, the autopilot warning can be cancelled by another push to the TOGA switch, or by pushing the AP disconnect switch.
Vertical go-around mode is selected by pushing either one of the thrust lever-mounted TOGA switches while airborne. Go-around mode is cleared by engaging the autopilot, by selecting FD SYNC or by the selection or capture of another active mode.
Go-around mode is annunciated with a green GA message in the vertical capture
field on the primary flight display.
F. Altitude Alert System
The primaryflightdisplays (PFD’s) alertthepilotsthatthe aircraftis approachingthe preselected altitude, orthatthe aircraftis deviatingfromapreviously selectedand acquired altitude. Altitudeadvisories are indicated on thealtimeterportion ofthePFD’s atthepreselectaltitudedigital readouts(above thebarometric tape). Itis also displayed atthepreselectbugs, includingthedouble bars (across thefine andcoarse tapes).
The altitude alertsystemprocesses data fromthe airdata computers andis independentofautopilot or flightdirector mode. The ALTknob ontheflight control panelis usedto setthedesiredaltitude.
The preselectdigital readoutandbugs change stateand color as follows:
W Atthe altitudealertthreshold,the readoutandbugsflash magentaforapproximately fourseconds, andaone-second auraltone sounds. Thethresholdis approximately 1,000feetfromthe selected altitude.
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W When within 200feetfromtheselected altitude,the readoutandbugs come on steadytoindicatealtitude capture.
W Ifthe aircraft subsequentlydeviates more than200feetfromtheselected altitude, thereadoutandaltitudebugs(double bars)willflash amber and a one secondtone willbe heard. The readoutandaltitudebugswill continue to flash amber as long as theaircraftis deviated more than200feet orcancelled.
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