(11)
Release the control wheel and let the wheel go to center.
S 214-039
(12)
Make sure the MCDP bottom line values are 0 |1.5 lbs.
NOTE: If the transducer null values are not in the limits, make
____ sure the gap is OK and adjust it as necessary. If the values are still not within the limits replace transducer.
S 714-040
(13) Do MCDP Ground Test 16 - XDCR WHL (Ref 22-00-02).
(a) Make sure no fault messages show during the test.
I. Put the Airplane Back to its Usual Condition.
S 864-041
(1)
Set the MCDP to off.
S 434-042
(2)
Close the 113AL access door (Ref 06-41-00).
(3)
Remove hydraulic power if it is not necessary (Ref 29-11-00).
(4)
Remove electrical power if it is not necessary (Ref 24-22-00).
S 864-043
S 864-044
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A
757 MAINTENANCE MANUAL
AUTOPILOT/FLIGHT DIRECTOR WARNING AND ANNUNCIATION -
____________________________________________________ DESCRIPTION AND OPERATION
_________________________
1. General (Fig. 1)_______
A. The warning and annunciation functions of the Flight Control Computers (FCCs) provide Autopilot/Flight Director System (AFDS) status and alerts the crew to system failures. The following displays are provided.
(1)
Autopilot (A/P) caution and warning lights located on the P1 panel.
(2)
Two master caution and warning lights located on the pilot's glareshield (P7).
(3)
Two Electronic Attitude Direction Indicators (EADI), one on the P1 panel and one on the P3 panel. The EADIs display the following annunciations:
(a)
Flight mode annunciation
(b)
Flight mode failure annunciation
(c)
Autopilot engage status annunciation (Ref 22-11-00)
(d)
Flight Director (FD) engage status annunciation (Ref 22-11-00)
(4)
Two Autoland Status Annunciators (ASA), one on the P1 and one on the P3 panel.
B. AFDS Warning and Annunciation (Fig. 2)
(1)
Annunciation
(a) The operational (armed and engaged) flight modes are annunciated on the Electronic Attitude Director Indicators (EADIs). The displays include autopilot and flight director engage status. The armed and engaged modes for pitch and roll are also displayed. Status and mode failures add a yellow line through the annunciation.
(2)
Autoland Status
(a)
GUN 001-050, 052-999; Autoland status is provided by two Autoland Status Annunciators (ASAs) connected in parallel. They are controlled by the three Flight Control Computers (FCCs). The ASAs display the loss of autoland capability in all phases of flight, and display the autoland status during the approach mode.
(b)
GUN 051; Autoland status is provided by two Autoland Status Annunciators (ASAs) connected in parallel. They are controlled by the three Flight Control Computers (FCCs). The ASAs only display the autoland status during the approach mode.
(3)
Autopilot Caution
(a) One autopilot caution light is connected in parallel with the three FCCs. The light indicates a problem requiring crew attention. A separate output turns on the master CAUTION lights (2), an owl aural tone, and the Engine Indicating and Crew Alerting System (EICAS) computer displays an AUTOPILOT message (Ref 31-51-00, Warning System).
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A
757
MAINTENANCE MANUAL
MASTER WARNING LIGHT (2) (REF)
MASTER CAUTION LIGHT (2) (REF)
AUTOPILOT CAUTION LIGHT
AFDS Warning and Caution Annunciation - Component Location
Figure 1
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