Photo © Shary(Shahram)
|Quoting Speedracer1407 (Reply 3):|
I believe those little doors (whatever they're called) were on the original JT9-D 747 engines, but were later considered unnecessary following a redesign of the intakes.
|Quoting Dw747400 (Reply 8):
Are they mechnaically actuated or does the airflow force them open under certain circumstances
|Quoting VC-10 (Reply 10):|
They are spring loaded closed & open by suction at HIGH RPM