(c)
If the CANC switch has not been pressed, the most recent messages of each priority group will always appear on page 1. Any message which occurred earlier will overflow into the non-displayed pages. All crew alerting messages are real time and are active only while their defining condition exists. Thus, messages will self-clear when the condition which initiated them ceases to exist.
(d)
A STATUS cue will be displayed below the message list whenever an EICAS message becomes active. This cue will be reset when the status format is selected, or will self-clear when the condition which initiated the cue self-clears.
(16)
In-Flight Start Envelope
(a) Indicates the allowable range of computed airspeeds for an in-flight engine restart. This information is displayed below the EICAS message field if any engine is shutdown during flight. The present altitude is displayed in units of ft x 100 and the speed range is displayed in units of knots.
(17)
Landing Gear (Fig. 34)
(a)
Two types of landing gear position indicators may be displayed.
(b)
During normal conditions, a single gear indicator represents the conditions for the nose, wing and body gear. 1) A white colored UP annunciator is displayed if all gears
are up and locked. A green colored DOWN annunciator is displayed if all gears are down and locked. If the gear is in transit, a white colored //// is displayed.
2) The entire gear feature is removed if the gear display has indicated UP for ten seconds.
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747-400
MAINTENANCE MANUAL
DOWN
SINGLE GEAR INDICATOR
UP GEAR UP
DN DN
MULTIPLE GEAR INDICATOR
Landing Gear Indicators
Figure 34
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
(c) During abnormal conditions, a multiple gear indicator is required to display the conditions for all individual gears. An abnormal condition exists if any of the following conditions exist:
-Alternate gear extension is armed
-GEAR DISAGREE EICAS message (CAUTION) is displayed
-Landing gear position parametric data is invalid.
1) A white colored UP annunciator is displayed if the individual gear is up and locked. A green colored DN annunciator is displayed if the individual gear is down and locked. If a gear is in transit, a white colored // is displayed.
2) If any landing gear position parametric data becomes invalid, a small amber colored letter x is displayed within a white colored box for all gears.
(18) LE/TE Flaps (Fig. 35)
(a) Three types of Leading Edge (LE)/Trailing Edge (TE) flap position indicators may be displayed. 1) The single flap indicator represents the condition for all
LE and TE flap segments. This indicator is displayed
during normal flap operation.
2) The multiple flap-primary indicator is required to display all individual flap segment conditions. This indicator is displayed for any of the following conditions:
-
EICAS message FLAPS PRIMARY (caution) is displayed
-
EICAS message FLAPS DRIVE (caution) is displayed
-Any LE or TE flap position data is invalid.
3) The multiple flap-alternate indicator is required to monitor TE flap position on a marked scale. This indicator is displayed for either of the following conditions:
-EICAS message FLAPS CONTROL (caution) is displayed
-All FCUs failed.
(b) Single Flap Indicator 1) General a) An analog thermometer represents the conditions for all LE and TE flap segments.
b) The analog thermometer is scaled with equally spaced flap lever detents for 0, 1, 5, 10, 20, 25 and 30 degrees. The 0 (up/retracted) detent is at the top of the thermometer.
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