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MAINTENANCE MANUAL
EPR OR THR AS INSTALLED
MODE CONTROL PANEL . A/T ARM ON . EPR SELECTED ATTITUDE DIRECTOR INDICATION . EPR MODE DISPLAYED . SPEED ERROR DISPLAYED
UPPER EICAS DISPLAY . CLB MODE SELECTED . REF EPR DISPLAYED . MAX EPR DISPLAYED . REF BUG DRIVEN BY TMC
AIRPLANES WITH STANDARD FORMAT FAST/SLOW DISPLAY AIRPLANES WITH SPEED TAPE DISPLAY AIRPLANES WITH EURO FORMAT FAST/SLOW DISPLAY
Autothrottle - EPR Mode
Figure 13
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M21281
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MAINTENANCE MANUAL
3
AIRPLANES WITH STANDARD FORMAT FAST/SLOW DISPLAY AIRPLANES WITH SPEED TAPE DISPLAY AIRPLANES WITH EURO FORMATS FAST/SLOW DISPLAY
M21347
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(14)
Autothrottle - Flight Level Change Mode (Fig. 15)
(a)
The Flight Level Change (FLCH) mode is engaged when the A/T switch is in the ARM position and the MCP accepts the FLCH mode request (in air only).
(b)
For a climb transition, throttle command to achieve the EPR REF is given to the A/T servomotor generator. For a descent transition, the aft PLA or MIN EPR, based on fuel flow or anti-ice requirements, controls the minimum throttle position. During descent in icing conditions, the approach idle power setting is used as minimum thrust setting.
(c)
When the FLCH mode is engaged, annunciation of FLCH appears on the EADI. The reference bug on the EICAS EPR indicator is driven by the TMC to the EPR REF value. The fast/slow display on the EADI provides speed performance information as related to the MCP selected speed.
(d)
If the selected altitude on the MCP is changed 500 feet or more, a new transition is commanded. Manual thrust lever movement by the pilot places the autothrottle servo in a hold state until a new mode is selected or the selected altitude is reached.
(15)
Autothrottle - Go-Around Mode (Fig. 16)
(a)
The Go-Around (G/A) mode is automatically armed when the A/T switch is in the ARM position and; the glideslope is captured (from the FCC) or the flap position is greater than zero. Actual go-around engagement occurs when a go-around switch on the thrust levers is pressed.
(b)
When the G/A mode and an autopilot channel are engaged, the thrust levers advance to achieve a 2000 fpm rate of climb as limited by the EPR REF. When the G/A mode is engaged with no autopilot engaged, the thrust levers advance to achieve the EPR REF. When the go around mode is operational, annunciation of GA appears on the EADI. In addition, the reference bug on the EPR indicator is driven by the TMC to the EPR REF value.
(16)
Autothrottle - Flare Retard (Fig. 17)
(a) Autothrottle flare retard occurs upon request from the FCCs when two or more A/P channels are engaged. The autothrottle must be engaged in the SPD mode. Flare occurs at 50 feet radio altitude.
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