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Bunuel
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Quote:
Had not doubted is idiomatically wrong or is it a tense error?

Raj30

Oh! "Had not doubted" is definitely a past perfect tense.... although I still feel like "had not doubted" and "had no doubt" (also past perfect?) mean slightly different things.
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Isn't the sentence formation wrong itself? egmat

The sequence of events is:

spikes observation, failure analysis, vibration analyst conclusion( no doubt)

had --> presents the older action among two past actions.

Should'nt the sentence have been?

After performing failure analysis on the ripped gearbox, the vibration analysts did not doubt that the spikes in vibration
spectrum observed in the morning had been caused by the leakage in lubrication mechanism of the pumping system.
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