(a)
The CPU/Timing module functions consist of the central processing unit, interrupt priority logic, real-time reference and watchdog monitor, memory parity generation and checking.
(b)
The memory module contains program storage and variable memory which are functionally independent. A growth location memory module is also provided.
(c)
The ARINC 429 DITS module interfaces all TMC digital inputs and outputs to the digital processor. The ARINC DITS expansion module contains the overflow and growth ARINC receivers.
(d)
The analog I/O module interfaces TMS external AC inputs and outputs and TMC internal DC inputs and outputs to the digital processor.
(e)
The System Interface Module (SIM) performs two functionally separate operations. It receives and transmits airplane system information in the form of analog discretes. It also provides non-volatile memory for registering the results of specific internal self-tests that generate a TMC INVALID digital discrete.
(f)
The power supply module provides all power conversion for the TMC and TMSP circuits.
(3)
One connector with three inserts is on the back side of the TMC. One insert contains TMC power pins only. The other two inserts contain the TMC signal pins and low voltage power pins. Index pins ensure correct TMC installation.
B. Thrust Mode Select Panel (TMSP) (Fig. 6)
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MAINTENANCE MANUAL
THRUST MANAGEMENT COMPUTER CONNECTIONS
Thrust Management Computer
Figure 5
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MAINTENANCE MANUAL
TEMPERATURE SELECT KNOB
Thrust Mode Select Panel
Figure 6
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MAINTENANCE MANUAL
(1)
The TMSP consists of six pushbutton switches, one rotary switch, and two circuit cards mounted in a metal case. Panel switch illumination is provided by the edge-lit lightplate panel. The lightplate is powered by variable 0 to 5 vac provided by the airplane master dim and test circuits. A connector at the rear of the unit mates the TMSP with airplane wiring.
(2)
Select Switches
(a)
Manual thrust limit mode selection is accomplished by pressing the TMSP pushbutton for the desired mode. The switches ground the appropriate mode discrete bit line when activated. This informs the TMC that a particular mode has been selected. Pressing a pushbutton corresponding to the currently selected mode has no affect.
(b)
The TMSP provides two derating schedule methods for reducing the thrust limit. Fixed derating schedules are selected by pressing TMSP derate pushbutton 1 or 2. Variable derating schedules are selected by using the TEMP SEL (temperature select) knob.
(c)
The TEMP SEL knob controls a binary-coded, 22-position, continuous-rotation switch. The five bits that represent the position of the switch are transmitted to the TMC as part of the REQ MODES word. The TMC uses the switch position information (assumed temperature) to compute a derated value of thrust limit. Clockwise rotation of the knob by one detent position causes the flat rated temperature to be displayed on the upper EICAS display unit. Continued clockwise rotation changes the display in 1°C increments of the selected temperature. An increase in assumed temperature derates the thrust limit value.
(3)
Module Description
(a)
The circuit components of the TMSP are on two cards. The ARINC transmitter circuit card assembly contains the ARINC 429 serial data communication circuits. The clock generator circuit card assembly generates the timing signals required by the data communications circuits.
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