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747 Photo and/or Graphic Element
NORM - Selects normal Electronic Engine Control mode. Sets thrust using EPR as the controlling parameter.
Prevents overboost at full throttle.
ALTN - Selects Alternate Electronic Engine Control mode. Thrust be manually set using N1 as the controlling parameter.
Autothrottle disengages. Alternate mode automatically selected during reverse thrust.
ALTN Lights - Come on when alternate electronic engine control mode is selected. Light is inhibited during reverse thrust.