Autothrottle off or Arm on the B737
A search indicates that this subject has been discussed previously. The most recent Boeing published revision to the B737 FTM states that the use of ARM for landing is not recommended. This is the first time that the manufacturer has seen fit to make a policy statement on the subject.
This suggests that something undesirable can occur if the autothrottle is left at ARM and speed deselected. As usual Boeing are wary about explaining exactly why they recommend a specific handling policy - which goes part way to explain the plethora of different handling techniques espoused by different airlines for the same aircraft type.
Leaving the autothrottle at ARM and deselecting Speed is a common technique used by 737 operators, but I now wonder if this is wise, considering the latest Boeing words on the subject.
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