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A Captain’s FD switch and First Officer’s FD switch are provided on the FGCP. When the Captain’s FD switch is ON, pitch and roll commands are displayed on the Captain’s ADI. When the First Officer’s FD switch is ON, pitch and roll commands are displayed on the First Officer’s ADI.
A Flight Director selector provides the capability to select either DFGC 1 or 2 for control of the V-command bar and fast / slow pointer on both ADI’s. When in NORM, DFGC 1 controls the V-command bar and fast / slow pointer on the Captain’s ADI, and DFGC 2 controls the V-command bar and fast / slow pointer on the First Officer’s ADI. When in BOTH ON 1, DFGC 1 controls the V-command bar and fast / slow pointer on the Captain’s and First Officer’s ADI. When in BOTH ON 2, DFGC 2 controls the V-command bar and fast / slow pointer on the Captain’s and First Officer’s ADI. When data provided to the V-command bar on either ADI is unusable, the applicable V-command bar will be removed from view and a warning flag will appear.
Appropriate annunciations will appear on both FMAs to indicate existing operating mode of the FGS.
Autothrottle / Speed Control
The autothrottle / speed control functions are available for operation from takeoff to landing. Aerodynamic sensors, airplane surface transducers, CADCs, and other sources provide inputs to the DFGCs for speed control processing. The DFGCs provide speed control pitch commands for flight director, autopilot and the fast/slow indicator display. The FGCP contains the necessary controls for selection of the reference SPD / MACH and the desired autothrottle mode of operation.
Continental
Rev. 12/01/00 #29 Flight Manual
The speed control functions provide two coupled speed control modes (takeoff and go-around). The takeoff and go-around modes are available only when the flight director and/or autopilot is engaged. Four throttle operational modes may be selected on the FGCP and additional modes occur automatically. Selected throttle modes are: PERF (PMS), indicated airspeed select (SPD SEL); Mach select (MACH SEL); and EPR limit. The thrust rating indicator is used to select a thrust EPR for limit mode. Thrust EPRs that may be selected include takeoff (TO), takeoff flexible (TO FLX), go-around (GA), maximum continuous thrust (MCT), climb (CL), and cruise (CR). Modes that occur automatically are as follows: SPD ATL / MACH ATL, LOW LIM, FLAP LIM, SLAT LIM, VMO LIM, MMO LIM, ALFA SPD, RETD, and CLMP. These modes are available only for autothrottle control of throttles. Speed error signals are displayed by the fast / slow indicator on the ADI. Fast / slow indications are displayed for all modes except retard (RETD).
Appropriate annunciations including numerical values (when applicable) appear on the FMA to indicate existing operating mode of autothrottle / speed control.
Speed Control
Speed control inputs for attitude control are displayed by the V-command bar and fast / slow indicator and the ADI during takeoff and go-around modes.
During takeoff mode of operation, the V-command bar on the ADI will command a pitch attitude to maintain V2+10 KIAS for two-engine operation. In the event of an engine failure during takeoff, pitch commands for one engine operation will be as follows: if the airspeed is between V2 and V2+10 KIAS at the time of engine failure, the V-command bar will command a pitch attitude to maintain an airspeed between V2 and V2+10. If the airspeed is less than V2, the V-command bar will command a pitch attitude to maintain V2. If the airspeed is V2+10 KIAS or greater at the time of engine failure, the V-command bar will command a pitch attitude to maintain V2+10 KIAS.
During go-around mode, the V-command bar on the ADI will command the go-around speed.
The fast / slow indicator will display airspeed error between computed takeoff or go-around speed and the existing airspeed. Thrust is set to the ERP LIM manually or automatically by the autothrottle if engaged.
Any desired airspeed can be selected on the FGCP, but speed control inputs are limited to prevent commands which exceeds flap / slat and VMO / MMO limit speed and to prevent commands lower than safe stall margin speed. Speed control inputs for fast / slow indications and the autothrottle command the pilot or autothrottle to adjust the throttles to maintain the higher reference speed of either the safe stall margin speed (ALFA speed) or the airspeed selected on the FGCP.
Autothrottle
The autothrottle function automatically positions the throttles to maintain airspeed or engine thrust as required for the operational mode selected. The autothrottle function will control the throttles for the following maneuvers: takeoff, climb, cruise, holding, approach, flare, and go-around.
The autothrottle function is engaged by moving the AUTO THROT switch from OFF to AUTO THROT position. The switch will not remain in the AUTO THROT (on) position unless all interlocks and engage requirements are satisfied. When the autothrottle is engaged, the AUTO THROT switch will automatically revert to OFF when the FGS monitor detects a malfunction or when the autothrottle disconnect button on either throttle is pushed. The THROTTLE warning lights on the FMAs will illuminate when the above occurs or when the AUTO THROT switch is manually moved to OFF. Pushing either autothrottle disconnect button or manually moving the AUTO THROT switch to ON will cause THROTTLE lights to go out.
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MD-80 Flight Manual 麦道80飞行手册 2(138)
