I-NNAV
If you have flown the ATR you will understand the meaning of Lo Pitch fail and ATPCS failure impact on take off performance.Swift manual feathering would have been required to comply with second segment climb.It might be whilst trying to do that and arrest descent rate they eroded speed and fell below Vmca..that is the scenario am eyeing upon and hope when reports are released to confirm or cofound it.Any ATR 72-600crew in here please can you shed any ligh t on this.
Dispatch with ATPCS u/s or off requires:
Bleeds off
Increase V1 limited by Vmcg by 5kts
Incr Vr by 2kts
Increase Vmca by 3kts
Decrease max 2nd segmet weight by....3600kg in case of ATR 72
For Approach increase Vmcl by 3 kts
So if any of the above were breached in an ATPCS unavailable scenario you can see the performance impact.
Last edited by Trackdiamond; 4th Feb 2015 at 13:58.