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F/O AUTOLAND STATUS ANNUNCIATOR
AFDS Warning and Annunciation Figure 2
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(4)
Autopilot Disengage Warning
(a) Autopilot disengage warning is provided by a dual lamp indicator connected in parallel with the three FCCs. The light indicates disengagement of an FCC when no other FCCs are engaged. One lamp is controlled by normal power, the other by standby power. Separate outputs from the FCCs turn on the master WARNING lights (2), a siren aural warning, and the EICAS computer displays an AUTOPILOT DISC message (Ref 31-41-00, 31-51-00).
(5)
Cross-Channel Data
(a) Digital buses and analog discrete connections interface with the three FCCs. The computers share sensor input data and engage status information.
2. Component Details_________________
A. Autopilot/Flight Director Flight Mode Annunciation (Fig. 3)
PITCH MODES STATUS
D01017
Figure 3
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(1)
Status
(a) The autopilot engage status (CMD or CWS) is the top line of the display in the lower right corner of the EADI. The flight director engaged status (FD) is also annunciated.
(2)
Roll Modes
(a) The armed and engaged roll modes are indicated below the status display.
(3)
Pitch Modes
(a) The armed and engaged pitch modes are displayed in the lower left corner of the EADI. Overspeed or minimum speed limit displays override normal annunciation.
(4)
Fail Display
(a) Status or mode failures place a yellow line through the status or mode communication.
B. Autoland Status Annunciator (Fig. 4)
(1)
Displays
(a) The Autoland Status Annunciator (ASA) consists of two mechanical displays driven by magnetic coils. The coils use 28 vdc to operate the display. Each display has three faces. One face is blank; the other two faces are designated as A and B. Figure 4 shows the displays and associated color.
(2)
Switches
(a)
GUN 001-050, 052-999; Three momentary pushbutton switches are on the ASA panel. Pressing the reset (P/RST) switch clears the bottom display, which indicates the failure mode. Two Press-To-Test (PTT) switches are on the right side of the annunciator. Test 1 shows both A faces. Test 2 shows both B faces.
(b)
GUN 051; Three momentary pushbutton switches are on the ASA panel. Pressing the reset (STATUS) switch clears the bottom display, which indicates the failure mode. Two Press-To-Test (PTT) switches are on the right side of the annunciator. Test 1 shows the top A face. Test 2 shows both B faces. The bottom A face is not used.
C. Autopilot Warning and Caution Lights and Annunciations (Fig. 5)
(1) Warning Light
(a) The A/P DISC light is a dual-lamp indicator controlled by the FCCs. One lamp uses normal 28 vdc power. The other lamp uses 28 vdc standby power. The color of the indicator is red. The A/P DISC light is part of the Discrete Warning Display Module (Ref 33-16-00).
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