"About 12 minutes before the end of the recording, there was an apparent loss of vertical control, " said John Hammerschmidt, a NTSB investigator.
12.
We're in a vertical dive, not a dive yet, but, uh, we've lost vertical control of our airplane, " he said, almost in a gasp.
13.
All elevations use the North American Vertical Datum of 1988 ( NAVD88 ), the currently accepted vertical control datum for United States, Canada and Mexico.
14.
-- " Observation No . 2 : Approximately 12 minutes before the end of the recording, the airplane experienced an apparent loss of vertical control.
15.
About 12 minutes before the end of the recording, the plane experienced an apparent loss of vertical control, meaning the plane was essentially falling out of the sky.
16.
Also for the professional enthusiast was the vertical control grip ( VC-7 ) that replicated some basic controls for vertical shooting and extending shooting time with extra batteries.
17.
"Yeah, we're out of 26, 000 feet, we're in a vertical dive _ not a dive yet _ but, uh, we've lost vertical control of our airplane ."
18.
The lever extends to the right from a vertical control shaft . The lever has a neutral position with the lever extended directly to the right of the pivot.
19.
The "'North American Vertical Datum of 1988 "'( "'NAVD 88 "') is the vertical control United States of America based upon the General Adjustment of the North American Datum of 1988.
20.
Manual control of collective pitch was added to the automatic collective pitch change system to provide precise vertical control in hover and the ability to cushion a landing from an autorotative descent.
