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13) ALT MODE OPERATE - Altitude engage and not altitude hold engaged 14) ALT HOLD MODE OPERATE - Altitude engage and altitude hold
mode engaged 15) VNAV ARM - VNAV (ANNUN) or VNAV OPERATE (ANNUN) valid 16) VNAV LIGHT ON - VNAV ARM valid 17) APPR LIGHT ON - G/S active or G/S mode arm valid 18) VERT SPEED LIGHT ON - Vertical speed armed 19) FL CH LIGHT ON - Flight level change mode selected 20) SPEED OPERATE - Flap limit not exceeded, min speed limit
not exceeded, and flight channel (ANNUN) is valid
C. Autopilot/Flight Director System Caution and Warning Annunciation (Fig. 8)
(1) Autopilot Caution
(a) Any AFDS failure requiring crew attention illuminates the master CAUTION light, displays an amber message on the main EICAS display, and sounds an aural tone (Ref 31-51-00/001). A power or computer failure inhibits the caution output to prevent a false annunciation. The following conditions cause a CAUTION SIGNAL prior to multi-channel engaged only: 1) Failure of Air Data Computer, Radio Altimeter, and
Instrument Landing System (outer loop) data or interfaces
for 4 seconds when the pitch or roll servos are engaged. 2) An elevator or aileron servo camout monitor was tripped. 3) An automatic stabilizer trim failure when the servos are
engaged 4) Autopilot in flare mode with only one channel engaged in
CMD mode. 5) Local inner loop data invalid in the F/D mode. 6) Altitude hold or override mode cannot be engaged within 4
seconds. 7) Air Data Computer inner loop signals invalid for 4 seconds (airplane in cruise). 8) Self test failures occur in the ILS or RA receivers.
(b) During multi-channel engaged, the CAUTION SIGNAL is inhibited except for the following conditions: 1) FCC program pin status invalid (Ref 22-10-00/001). 2) Simultaneous test on two or more ILS receivers (ILS test
requests are normally inhibited during multi-channel engage)
3) Simultaneous ILS data failure (two or more ILS receivers) due to No Computed Data (NCD) in the data word SSM for more than four seconds
4) Automatic stabilizer trim failure in all three FCCs (airplane above alert height)
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(2) PFD Failure Annunciation
(a) The PFD indicates an autopilot mode failure with a yellow line striking through the engaged mode annunciation. An autopilot mode failure also biases the F/D command bars from view. A F/D mode failure is indicated when the F/D command bars are biased from view. An A/P or F/D mode failure is annunciated when the conditions under the caution section C.(1) occur. 1) When the FCC(s) detects a pitch and/or roll mode failure,
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