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Old 18th Mar 2018, 00:51
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Banana Joe
 
Join Date: Jan 2018
Location: Amantido
Posts: 854
VNAV PTH and VNAV SPD

Going through my first type rating and I am a bit confused on the difference between VNAV PTH and VNAV SPD. Am I correct in saying that:
  • in VNAV PTH the FMC will command pitch to mantain pitch and if required it will command the autothrottle to mantain FMC SPEED
  • in VNAV SPD the FMC will retard the throttle levers to IDLE and mantain speed with pitch and will not attempt to stay on path similar to LVL CH
I do understand that the ideal descent path, provided forecast winds are correct, will result in a idle descent.
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