Boeing 757 Thrust Management Computer (TMC)

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Thrust Management Computer (TMC)
The thrust management computer calculates a reference EPR based on existing pressure altitude and ambient temperature data from the air data system for the following modes:
• TO – takeoff
• TO 1 – takeoff one
• TO 2 – takeoff two
• D-TO – assumed temperature takeoff
• CLB – climb
• CLB 1 – climb one
• CLB 2 – climb two
• CRZ – cruise
• CON – continuous
• GA – go–around
These modes can be selected with the thrust mode select panel (TMSP). The inner Thrust reference set control on the EICAS control panel must be pushed in for the thrust reference modes to be displayed on EICAS. The selected thrust reference mode is displayed above the EPR indicators. The digital reference EPR is displayed adjacent to the mode display. When the EPR bug is green, it is 
positioned on the EPR scale at the same value as the digital reference EPR.
The thrust mode select switches provide the capability of selecting different thrust 
modes for each phase of flight. The TO/GA switch is used to select takeoff thrust 
on the ground and go-around thrust in flight.
The 1 and 2 switches are used to select a reduced takeoff thrust rating or reduced 
climb thrust. When reduced takeoff thrust rating one or two is selected, this 
automatically preselects the associated reduced climb one or two. The CLB switch is used to select climb thrust inflight. If reduced climb thrust one or two was 
preselected, pushing the climb switch inflight selects CLB 1 or CLB 2.
The assumed temperature for a reduced thrust takeoff can be set by:
• using the assumed temperature selector on the TMSP
• entering the assumed temperature into the CDU TAKEOFF REF page
The CON switch is used to select maximum continuous thrust inflight. The CRZ switch is used to select cruise thrust inflight. The assumed temperature selector or the CDU is used to set assumed temperatures when reduced takeoff thrust is desired.
To manually set reference EPR values the thrust reference set control is pulled out, 
MAN appears as the thrust mode annunciation and the EPR bug slews to 1.55. manual reference EPR values can then be set by rotating the inner control. The outer control of the thrust reference set control is used to select the desired EPR indicator(s) for manual EPR display. The autothrottles do not respond to manually set reference EPR values. When the inner control is pulled out, the autothrottles remain in the active TMC mode. The TMSP remains operable and the autothrottles respond to TMSP mode changes, but selected thrust reference mode displays are inhibited.
When the AFDS VNAV mode is engaged, the EPR bug may be magenta. When 
the EPR bug is magenta, it is positioned at a nominal target EPR by the FMC, 
which may not correlate with the digital reference EPR. In VNAV, the FMC 
controls thrust mode selection automatically to meet thrust requirements for the active vertical mode of operation. The FMC does not have the capability to select reduced climb thrust values, these values must be selected manually with the 1 or 2 TMSP switches.
The thrust reference mode, reference EPR and target EPR indication are not 
displayed when the reversers are fully deployed.

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