Milestone For Achieving Type Inspection Authorization From
Boeing's Dreamliner has completed flutter and ground effects
testing, and apparently passed with flying colors according to a
blog entry posted last week.
Commercial Airplane Marketing Vice President Randy Tinseth wrote
that the flutter test was conducted at a variety of speeds and
altitudes and is now cleared to fly through its complete flight
envelope. In flutter testing, oscillations are purposely introduced
to verify that the flutter will naturally dampen under normal
flight parameters. "We tested at a variety of altitudes,
speeds and fuel loads on ZA001," Tinseth wrote. "During the
testing, we saw altitudes above 43,000 feet, dive speeds as high as
Mach 0.97, and calibrated airspeeds as high as 405 knots. The
technical team has made an initial assessment of the data and we
couldn’t be more pleased with the performance of the 787. The
damping was as predicted and the pilots report that the airplane
responded as expected."
The ground effects characteristics of the airplane were tested
in Victorville, CA, on ZA002. Tinseth said the tests went well and
the airplane performed as expected.
All of the test data is being handed to the FAA as for Type
Inspection Authority. Certification testing will begin when that
authority is granted.