OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
A/THR should be monitored via the:
? FMA – SPEED / SPEED TREND on the PFD
? N1/N1 command (EPR) on the ECAM E/WD.
AUTOTHRUST (A/THR)
Criteria: P3379, SA
4 Applicable to: MSN 0486-4078
OBJECTIVE
The A/THR computer (within the FG) interfaces directly with the engine computer, referred to as the FADEC.
The A/THR sends to the FADEC the thrust targets that are needed to:
? Obtain and maintain a target speed, when in SPEED mode
? Obtain a specific thrust setting (e.g. CLB, IDLE), when in THRUST mode.
INTERFACE
When the A/THR is active, the thrust lever position determines the maximum thrust that the A/THR
can command in SPEED or THRUST mode. Therefore, with A/THR active, thrust levers act as a thrust limiter or a thrust-rating panel.
The A/THR computer does not drive back the thrust levers. The PF sets them to a specific detent on the thrust lever range.
The A/THR system provides cues that indicate the energy of the aircraft:
? Speed, acceleration, or deceleration, obtained by the speed trend vector
? N1, and N1 command on the N1 gauge.
All these cues are in the flight crew’s direct line of vision.
In other words, the Thrust Lever Angle (TLA) should not be used to monitor correct A/THR operation. Neither should the thrust lever position of a conventional autothrottle, be considered a cue because, in many hazardous situations, the thrust lever position can be misleading (e.g. engine failure, thrust lever jammed).
OPERATIONAL PHILOSOPHY
AP / FD / ATHR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
The TLP determines MAX Thrust for the A/THR
NORMAL OPERATIONS
The A/THR can only be active, when the thrust levers are between IDLE and the CLB detent. When the thrust levers are beyond the CLB detent, thrust is controlled manually to the thrust lever Angle, and the A/THR is armed . This means that the A/THR is ready to be re-activated, when the
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址:A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(24)