Chris Johnson, Index.
Formal Proof Techniques
- Any other proof of second order vibrations?
Following these tests, the strain guaged blade
sets were installed in an engine of a Boeing
707 flying testbed. The ensuing flight tests
showed that the vibratory response in flight
was considerably stronger than that apparent
during the ground tests. When using -3C1
rated climb power, a response was observed at
altitudes avove 10,000 feet which was at its
most severe at altitudes between 25 and 30,000
feet; vibratory stress levels of up to about
80% of the endurance limit were observe
(Page 58 from UK Air Accident Investigation Branch
report on the accident to Boeing 737-400 G-OBME near
Kegworth, Leicestershire on January 8th 1989.
- Report doesn't explain weakness of hypothesis.