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757 MAINTENANCE MANUAL
2) An amber MACH/SPD TRIM advisory message is displayed on the
EICAS display unit.When a loss of full rate trim occurs during manual electric trim due to SAM, actuation or airplane wiring faults the following indications are activated: 1) A discrete amber STAB TRIM light on the annunciator panel
illuminates. 2) An amber STAB TRIM advisory message is displayed on the
EICAS display unit.When the stabilizer is positioned outside the takeoff greenband range and the throttles are advanced, the following indications are activated: 1) Warning siren and discrete CONFIG red warning light on the
P1 panel illuminates. 2) A red STABILIZER warning message is displayed on the EICAS
display unit. 3) Master warning light in panel P7 illuminates.When SAM failure monitors detect a fault a first fail discrete is provided to the EICAS computer. This will cause a STAB TRIM message to be generated on the EICAS maintenance page.When a single autopilot is engaged and an autotrim failure (dead trim, unscheduled trim or AUTOTRIM signal from SAM is invalid as detected by the FCC) cannot be cleared by autosequencing, the following indications are activated.
NOTE: Autosequencing can occur only when the center FCC is
____ engaged.
1) A discrete amber AUTOPILOT caution light on P1 panel illuminates. 2) Master caution light on panel P7 illuminates and an aural tone (owl) is sounded. 3) A pitch mode fail (EFIS mode lined - out) is displayed on
EADI display units.When two or more FCCs are engaged and an autotrim failure (detected by the FCC during an approach) is cleared by autosequencing, NO LAND 3 is displayed on the Autoland Status Annunciators (ASA) after touchdown and disconnect of the autopilot. The ASAs are on the P1 and P3 panels.When two or more FCCS are engaged and an autotrim failure (detected by the FCC) cannot be cleared by autosequencing while the airplane is above Decision Height (DH), the following indications are activated. 1) NO AUTOLAND is displayed on each ASA. 2) A pitch mode fail (EFIS mode lined - out) is displayed on
EADI display units.
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757 MAINTENANCE MANUAL
3) A discrete amber AUTOPILOT light on the panel P1 illuminates.
4) Master caution light on panel P7 illuminates and the owl aural warning sounds.
(i) When two or more FCCs are engaged and an autotrim failure (detected by the FCC) cannot be cleared by autosequencing while the airplane is below Decision Height (DH), the following indictions are activated after touchdown and disconnect of the autopilot. 1) NO AUTOLAND is displayed on ASAs. 2) A pitch mode fail (EFIS mode - out) is displayed on EADIs. 3) A discrete amber AUTOPILOT light on panel P1 illuminates. 4) Master caution light on panel P7 illuminates and the owl
aural warning sounds.
F. Stabilizer Trim and Elevator Asymmetry Limit Module (SAM) (Fig. 4)
(1) SAM Description
(a) Each SAM is part of a dual redundant system. The SAM performs the following functions: 1) Generates Mach/speed trim commmands in response to input
Mach number and computed airspeed data.
Stabilizer Trim and Elevator Asymmetry Limit Module (SAM)
Figure 4
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