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 a)  Selection of signal source is automatic. No external switching is required by the crew. Signals are monitored for validity. If the selected source becomes invalid, automatic transfer to the opposite source occurs.
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A
757
MAINTENANCE MANUAL

VNAV SPEED SPEED
MODE OPEREPR IN FLIGHT
(THRUST LOGIC)
ENGINE

(VNAV LOGIC) F/S ENGA
FAILED

(ANNUNCIATION
IAS/MACHLOGIC)
SEL (MCP)
IAS SELMCP MACH SELSEL IAS/SPEED
MIN NCD 429TAS
SIGNAL
MACH (FMC)
ALT SELXMTR
SLOW
MODE
FL CH OPER
FLAP POSN MAX OPRTG

SIGNAL (FL CH LOGIC)
L SYMBOL GENSCHED
SELECT A/T & A/P GO AROUNDTHRUST CONTROL (THRUST LOGIC)
R
ENGA (GA LOGIC)
REF AOA

MIN
L

MINVNAV IDLE WITHOUT THRUST LIMITA/T MODE
THROTTLE
CALC
ACCEL
(THROTTLE RETARD LOGIC)
SPD F/S DISP
RATE C SYMBOL GEN
TO
SEL IASINDICATED AOA SIGNAL SELECT
SEL MACH
EPR
EPR

FMC
429
TARGET

FL CHLIMITS TO AVOID XMTR
ALT SEL EXCEEDING:
0.4
THROTTLETHROTTLE. EPR REF
R SYMBOL GENRATERATE TO
RATE TO EPR REF
ALT DEG/SEC . MIN EPR
R
(BARO NO.4)
RATE TO MIN EPR
1000FT LIMITS ACCEL EXCITATION
D
L
RELAY
A
T
GO-AROUND
TAS, CAS
2000 FT/MINADC ALT (BARO
EPR TO PLA
VERTICAL
A
CMD
NO. 4) INERTIAL VERT SPD
M PROCESSOR
IND AOA
A
MAX OPRTG
RATE TO AFT PLA LIMIT TO AVOID115V AC
SCHEDULE

N
THRUST  EXCEEDING:
RATE TO FWD PLA
THRUST

A
TO A/T ARM SW
G

. PLA AFT LIMITEPR REFVNAV THRUST. PLA FWD LIMIT
LIMIT
THROTTLER
ERROR
E
MODE OPER
M

ENGAGE
CALC CABLES
DETECT(VNAV LOGIC)
MAX
FLARE RETARD
L

LOGIC
E
(THROTTLE RETARD LOGIC)
NAVG

INERTIALL ACT EPR
R ACT EPR
T
RATE
ERROR
MIN IRS
INTEGRATORPLA
VERT SPD DETECT EPR TARGET (FMC)
RATE TO
LIM LIM D/A MOD
MTHROTTLER
LIM RATE
THROTTLE HOLD
T
L
MINERROR
(THROTTLE RETARD LOGIC)
NACELLE

EPRDETECT
CALC ECS BLEED
ANTI-ICE
A/DDEMOD CONFIG CARD
115V AC
SERVOMOTORR
AFTERRORGENERATOR
PLA
DETECT
L

CALC EPR CMD
MAXEEC
26V AC EPR DIFF
SELECT> 0.1FWD
ERRORFOR 0.5 SECPLA
R
DETECT A/D DEMOD
CALC
L

L EPR VALID
L PLA POSNL ACT EPR
ENGINE FAILED
TRANSDUCERR ACT EPR
R EPR VALID
EICAS L N3MIN
CAS > 80 KNOTS
R N3 SELECT A/D DEMOD FLAP
R PLA POSNPOSN
FSEU 1 THRUST MANAGEMENT COMPUTER TRANSDUCER
Autothrottle Block DiagramFigure 5
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MAINTENANCE MANUAL

 4)  Internal Monitors and Self Tests:
 a)  The internal monitoring system of the TMC performs tests requested by the MCDP and senses autothrottle disconnect. All faults are recorded and transmitted to the MCDP.
 (2) Mode Control Panel - Autothrottle Functions (Fig. 6)
 (a)
Autothrottle Arm Switch

 1)  The A/T arm switch is a two-position toggle switch that sends a 28 vdc analog discrete signal to the TMC. When positioned to ARM, it arms the excitation relay. The excitation relay connects the servomotor generator's 115 vac excitation and 36 vac servo control voltages, only after a mode is engaged.

 (b)
Mode Select Switches (EPR/THR, SPD, FLCH, VNAV)

 1)  The mode select switches provide mode engagement after arming has occurred.The switch dot-bar matrix illuminates when the mode request is accepted and operable.

 (c)
　
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