A little thread drift, still about a Boeing though..
I think it has been covered here some years ago, in the meantime the investigation is published:
http://www.aaib.gov.uk/cms_resources...JK%2009-10.pdf
B737-700 @ 447Kts somewhere btw FL100 and 5000 feet, on a manual reversion, company test flight.
The report states:
" He then rolled the wings level and attempted to arrest the rate of descent. This had peaked at 20,000 ft/min with the aircraft pitched 30° nose-down after the aircraft had been rolled to the left. The control forces remained high but the commander considered this to be due to the aircraft’s speed, which he observed at a maximum of 447 kt."
And then:
"The aircraft was inspected after landing for damage or deformation in accordance with AMM task 05-51-04 titled ‘severe or unusual turbulence, stall, or speeds more than design limits – maintenance practices (conditional inspection)’. No evidence of damage or deformation of the structure was found."
Makes for interesting reading.