TMCS -A/T ARM, A/T MODE, AND THRUST LEVER SWITCHES
EFFECTIVITY BEJ ALL 22-31-00
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TMCS -PRIMARY FLIGHT DISPLAY -OPERATION
General
The autothrottle (A/T) modes show on the primary flight display (PFD) when an A/T mode engages.
A/T Modes
Normal A/T mode annunciation and operation is with both the left and right A/T servo motors (ASM) in operation. A left (L) or right (R) precedes the A/T mode annunciation when only one ASM operates.
These are the A/T modes that show on the PFD:
*
Speed (SPD/X SPD)
*
Thrust (THR/X THR)
*
Thrust reference (THR REF/X THR REF)
*
HOLD/X HOLD
*
IDLE/X IDLE
*
TEST/X TEST.
SPD or X SPD shows when:
*
A/T engage conditions are valid and vertical navigation (VNAV) commands the throttles to hold SPD
*
VNAV or flight level change (FLCH) mode transitions to another pitch mode, such as vertical speed, altitude hold, capture, or glideslope capture
*
The A/T mode on the mode control panel (MCP) is active, the airplane is in the air and the autopilot flight director system (AFDS) is not in a speed mode.
EFFECTIVITY
BEJ ALL
THR or X THR shows when the TMCF receives an A/T mode request and goes into one of these modes:
*
VNAV descent
*
FLCH
*
Go-around (GA) thrust mode.
THR REF or X THR REF shows when the TMCF receives a takeoff (TO) A/T request from the left or right TO/GA switch and the TMCF commands the throttles to full TO thrust. THR REF shows for VNAV CLB or a GA thrust mode.
HOLD or X HOLD shows when the TMCF removes excitation power from the ASMs. HOLD shows in these A/T modes:
*
FLCH idle descent
*
FLCH with pilot override
*
TO thrust mode when computed air speed (CAS) is more than 80 kts
*
VNAV idle descent.
IDLE or X IDLE show for these A/T modes:
*
VNAV descent
*
A flare retard idle command from the AFDS.
TEST or X TEST shows when a TMCS ground test is active.
The A/T mode annunciation is blank with one of these:
* No A/T mode requests
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TMCS -PRIMARY FLIGHT DISPLAY -OPERATION
* The left and right TMCS invalid.
EFFECTIVITY BEJ ALL 22-31-00
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777 AIRCRAFT MAINTENANCE MANUAL
TMCS -PRIMARY FLIGHT DISPLAY -OPERATION
EFFECTIVITY BEJ ALL 22-31-00
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TMCS -EICAS DISPLAY -OPERATION
General
The EICAS display shows this TMCF data that relates to engine/ thrust performance:
*
Thrust limit mode
*
Selected temperature
*
Thrust limit
*
Target engine pressure ratio (EPR)
*
Maximum thrust limit.
Thrust limit Mode
The takeoff (TO) thrust limit mode shows automatically on the ground at power up. Other thrust limit modes show automatically or with a manual selection on the CDU THRUST LIMIT page when in flight. It also shows automatically when in flight and VNAV (vertical navigation) engages.
These are the three ways to derate the engine thrust:
*
Select TO 1 or TO 2
*
Enter an assumed temperature
*
Select CLB 1 or CLB 2.
Takeoff derates are available on the CDU THRUST LIMIT page. There are two TO derates, TO 1 and TO 2. The takeoff derate levels for TO 1 and TO 2 can change from 1% to a maximum of 30% below the full TO rating. The variable takeoff rating menu is on the AIRLINE POLICY PAGE.
EFFECTIVITY
BEJ ALL
A temperature derate occurs with a temperature entry on the CDU THRUST LIMIT page. The TMCF uses this value when it is more than the present temperature in use for TO thrust calculation. D shows in front of the TO thrust limit for a temperature derated thrust. A temperature derate can add derate to a fixed derate. In this case the D and TO 1 or TO 2 shows on the EICAS. The maximum temperature derate is 25% from a TO derate level. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 自動飛行 Autoflight(35)
