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Printed page 4. PDF page 18.
detent before moving to the 15� detent. The trailing edge flap position reached 10� about 2216:34. 17 Stalls occur when the AOA of the wing--that is, the angle between the direction of airflow and the wing-- exceeds a critical angleOpen final report at PDF page 18NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 5. PDF page 19.
airplane rolled to the right through wings level, the stick pusher activated (about 2216:34), and flaps 0 was selected. (The Q400 stick pusher applies an airplane-nose-down control column input to decrease the wing angle-of-attack [AOA] after an aerodynamic stall.) AboOpen final report at PDF page 19NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 25. PDF page 39.
Specifically, the CVR transcript indicated the stick shaker was only audible from 2216:27.4 to 2216:34.1 and from 2216:35.4 to the end of the recording (2216:53.9). During the 1.3-second time period during which the stick shaker was not audible on 65Open final report at PDF page 39NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 26. PDF page 40.
NTSB Aircraft Accident Report the CVR, an FDR sample (at 2216:34.6) indicated that the stick shaker was active.67 The sound spectrum study revealed evidence of stick shaker operation between 2216:34.4 and 2216:35.4, but the study did not idenOpen final report at PDF page 40NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407