Originally Posted by
Emmerson Bigs
Gotta mind those FMAs.
My guess: Hand flying. Initial level off was 5000, they got cleared to 11,000 very close to level off. 5K was already captured and they were in VNAV ALT. Altitude window gets spun to 11,000 but knob is not pushed to command VNAV SPD and A/T to climb power. PF raises the nose to start the climb and gets slow.
OR...
Master Caution beeper for the AIRSPEED LOW EICAS triggering (28:28 on liveATC), indicating they were below min maneuver speed. Then when he’s saying “Stall Stall Stall Stall Stall” the Master Caution beeper goes off again at 28:40 followed by the most likely AP disconnect triggering the Master Warning siren at 28:41.
Going to NGO I’d guess they departed with somewhere in the 740-766,000 TOW range with Flaps 15 based on my experience for similar range flights. The min flap maneuver to flap overspeed spread at those weights for Flaps 1/5 is about 3 knots. I’d bet money they retracted the flaps with not enough of an upward airspeed trend vector, while still 10-15 knots below min maneuver, with the autopilot on