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Limiting The A/T system provides speed and thrust envelope limiting. Thrust envelope limiting is based on the active EPR rating, while speed envelope limiting is based on minimum speed limits as well as placard and structural speed limits. Monitoring Monitoring is incorporated in the A/T system to ensure control integrity. The monitoring consists of validity, servo response and pilot override monitoring. Validity monitoring ensures that all parameters required for A/T control, during a specific phase of flight, are present and valid and detects engine out, engine reversion, thrust reverser deployment and internal faults. The servo response monitor compares the servo response with the commanded response to ensure the integrity of the servo control system. The pilot override monitor detects pilot movement of the thrust levers while the A/T system is engaged, to provide automatic disconnect of the A/T system. Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2 A/T 1 or 2 Select To select an A/T, select MENU twice on the MFD control Panel, then select AUTOTHROTTLE 1 or 2 by toggling and select ENT. A/T Engagement/Disengagement A/T Engagement Toggling the switches, while on the ground, during T/O phase, with the thrust levers less than 60% of max. thrust (23° TRA), will engage the A/T in an armed state. Subsequent advancement of both thrust levers above 60% max. thrust, while airspeed is less than 60 knots, will result in automatic engagement of the system into take-off thrust control, moving the thrust levers to the appropriate thrust settings. POWER PLANT |
