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They didn’t provide procedures for a no power landing. They also failed to update the conversion documentation.

And they designed and produced a plane with commonly faulty fuel gauges at the time.

> And they designed and produced a plane with commonly faulty fuel gauges at the time.

There hasn't been an accurate fuel gauge in aviation since the discovery of powered flight.

Did they "fail" to do it, or did they just "self-certify" the documentation? /s