(d)
11F16, TMC SERVO
S 034-013
(2) Loosen the mounting clamp screws adjacent to the TMSP front panel.
S 024-003
CAUTION: YOU MUST CAREFULLY REMOVE THE TMSP FROM THE INSTRUMENT PANEL TO
_______
PREVENT DAMAGE TO THE ELECTRICAL CABLE.
(3)
Remove the TMSP from the instrument panel.
(4)
Disconnect the electrical connector.
S 034-004
TASK 22-31-02-404-005
3. Install the Thrust Mode Select Panel
____________________________________
A. References
(1) AMM 22-00-02/201, Autoflight BITE
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A
757
MAINTENANCE MANUAL
(2) AMM 24-22-00/201, Electrical Power - Control
B. Access
(1) Location Zone
211/212 Flight Compartment
C. Install the Thrust Mode Select Panel
S 434-008
(1) Connect the electrical connector to the TMSP.
S 424-009
CAUTION: YOU MUST CAREFULLY INSTALL THE TMSP IN THE INSTRUMENT PANEL TO
_______
PREVENT DAMAGE TO THE ELECTRICAL CABLE.
(2)
Install the TMSP in the instrument panel.
S 434-010
(3)
Tighten the mounting clamp screws.
D. Do a Test of the Thrust Mode Select Panel
S 864-011
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-012
(2)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11A17, AUTOFLIGHT WARN
(b)
11F14, TMC AC
(c)
11F15, TMC DC
(d)
11F16, TMC SERVO
(3)
Do the MCDP Ground Test 05 TMSP (AMM 22-00-02/201).
(4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 714-006
S 864-007
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757 MAINTENANCE MANUAL
THRUST MANAGEMENT SYSTEM - DESCRIPTION AND OPERATION
____________________________________________________
1. General (Fig. 1)_______
A. The Thrust Management System (TMS) consists of a Thrust Management Computer (TMC) and Thrust Mode Select Panel (TMSP). It uses these to control a servomotor generator that drives the thrust levers. The TMS is a digital control system receiving inputs from the following primary interfaces:
(1)
Air Data Computers (ADCs)
(2)
Inertial Reference Units (IRUs)
(3)
Flight Management Computers (FMCs)
B. The TMS functions include thrust limit computation, thrust lever control, and data display. Engine thrust limits are computed for the selected mode on the TMSP, then displayed on the EICAS display unit. The flight crew uses this data to monitor autothrottle (A/T) operations or to assist in manually setting engine thrust. The A/T servomotor generator is connected to thrust levers through a no-back clutch pack assembly. The clutch pack allows manual thrust commands without backdriving the servo. The autothrottle provides thrust lever control to selected inputs throughout the full flight regime. The control laws governing A/T operation are based on airspeed, Mach, vertical speed and thrust target limits.
C. The autothrottle may operate independently or in a co-ordinated manner with the Flight Management Computer System (FMCS) and the Autopilot/Flight Director System (AFDS). The FMCS commands both the AFDS and TMS to follow flight path and speed commands as defined by FMC performance and vertical navigation functions (Ref 34-61-00, Flight Management Computer System, and 22-10-00, Autopilot (Flight Control)).
D. Thrust Management Computer (TMC)
(1) The TMC is on shelf E2-3 in the main electrical/electronic equipment bay. It provides thrust limit computation and thrust lever control to Engine Pressure Ratio (EPR), vertical speed, airspeed, and Mach references. Additional functions are provided for: minimum and maximum speed protection, thrust limit protection, and retarding thrust levers during autoland.
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