The AFCS WARNING panel is the last of three panels for the AFCS system that we will examine for the Lockheed L-1011 cockpit. In previous postings we looked at the AFCS MODE panel and the INSTRUMENT COMPARATOR panel. Like the other two panels, the AFC WARNING panel uses solenoid driven flags to indicate warning messages.This particular unit was made COLLINS AVIONICS and goes hand in hand with the AFCS Mode display.
Whenever a flag is raised on the panel, the ALERT button will blink until the ALERT button has been pressed. Pressing the button for a 2nd time resets the flag(s). The large print board on top of the instrument implements the former described feature.
Top View
Right hand side view. Here you can see the typical push solenoids used for the flags.
Bottom View.
Left hand view.
The two test switches, one in the top left and top right corner of the instrument, will show two different warning states each flag can be in.
Test 1 Button: AP DISC (Autopilot Disconnect), ATS DISC (Auto Throttle System Disconnect), AP LIMIT (Approach with Limited functions), NO FLARE (Automatic Flare not possible)
Test 2 Button: NO DUAL (No dual autopilot information for auto-land), NO GA (No automated go-around available). NO ALIGN (The Yaw Stability Augmentation System can not align the aircraft with the localizer), CMD DISC (Autopilot Command Mode not available).
Does the "AP DISC" indicator display if the pilot disconnects the autopilot, the "ATS DISC" indicator if the pilot disconnects the autothrottle, and the "CMD DISC" indicator if the pilot switches the autopilot from CMD to CWS mode? Or do they only appear if the relevant autopilot functions actually malfunction?
ReplyDeleteIn both cases.
DeleteIn CWS mode, do the pitch and bank modes still work to supply data to the flight directors, even though they don't control the aircraft any more? It would seem to pointless to have flight directors at all otherwise...
ReplyDelete