C Series Info
11-17-2017, 04:34 PM
#1671
Gets Weekends Off
Joined APC: Jan 2015
Posts: 272
Sort of.
The FCOM says to leave the AP on, but automatic disengagement may occur, e.g. alpha prot. That's why we just go ahead and get it off so we don't have to deal with the "shock" of low speed disengagement and having to adjust to the new, lower level of automation.
The FCOM says to leave the AP on, but automatic disengagement may occur, e.g. alpha prot. That's why we just go ahead and get it off so we don't have to deal with the "shock" of low speed disengagement and having to adjust to the new, lower level of automation.
But you are right about the possible AP disconnection and I am not disagreeing. Though I think we are being a little too conservative.
It works beautifully. Aas soon as you hear "windshear", engage the AP and just watch Fifi work for you.
11-17-2017, 04:55 PM
#1672
Da Hudge
Joined APC: Oct 2006
Position: Poodle Whisperer
Posts: 17,473
That's assuming your speed goes below V alpha Prot. Alpha floor being predictive, it should engage before your speed gets that slow. (At least in the Sim it always does! ��)
But you are right about the possible AP disconnection and I am not disagreeing. Though I think we are being a little too conservative.
It works beautifully. Aas soon as you hear "windshear", engage the AP and just watch Fifi work for you.
But you are right about the possible AP disconnection and I am not disagreeing. Though I think we are being a little too conservative.
It works beautifully. Aas soon as you hear "windshear", engage the AP and just watch Fifi work for you.
11-17-2017, 05:08 PM
#1673
Gets Weekends Off
Joined APC: Feb 2008
Posts: 19,423
Sort of.
The FCOM says to leave the AP on, but automatic disengagement may occur, e.g. alpha prot. That's why we just go ahead and get it off so we don't have to deal with the "shock" of low speed disengagement and having to adjust to the new, lower level of automation.
The FCOM says to leave the AP on, but automatic disengagement may occur, e.g. alpha prot. That's why we just go ahead and get it off so we don't have to deal with the "shock" of low speed disengagement and having to adjust to the new, lower level of automation.
EGPWS WARNING ESCAPE MANEUVER
PF
1 Accomplished Simultaneously
THRUST:
“TOGA”
- Set TOGA thrust
PITCH:
- Autopilot - disconnect
- Roll wings level
- Rotate to full back sidestick
2 CONFIGURATION
- Verify speedbrakes are in
- Do not alter gear/flap configuration until terrain clearance is assured
3 Climb to safe altitude
4 AFTER EGPWS RECOVERY
- Resume normal flight
11-17-2017, 05:20 PM
#1674
Gets Weekends Off
Joined APC: Jan 2015
Posts: 272
Airbus allows the windshear event to be flown with the autopilot on only if the system has detected a shear and windshear is annunciated. If it's a EGPWS windshear warning or pilot initiated windshear the aircraft will not fly it correctly. In that case Airbus recommends autopilot off. I think Delta goes autopilot off for both to keep it simple.
I don't remember having read anywhere that the aircraft could not fly the windshear correctly. I think it either flies it or it doesn't when the autopilot disconnects. By any chance, do you remember where you read that Airbus recommends the AP off?
11-17-2017, 05:26 PM
#1675
Gets Weekends Off
Joined APC: Jan 2015
Posts: 272
Airbus has two windshear escape maneuvers. They specifically state auto pilot off for the EGPWS windshear alert.
EGPWS WARNING ESCAPE MANEUVER
PF
1 Accomplished Simultaneously
THRUST:
“TOGA”
- Set TOGA thrust
PITCH:
- Autopilot - disconnect
- Roll wings level
- Rotate to full back sidestick
2 CONFIGURATION
- Verify speedbrakes are in
- Do not alter gear/flap configuration until terrain clearance is assured
3 Climb to safe altitude
4 AFTER EGPWS RECOVERY
- Resume normal flight
EGPWS WARNING ESCAPE MANEUVER
PF
1 Accomplished Simultaneously
THRUST:
“TOGA”
- Set TOGA thrust
PITCH:
- Autopilot - disconnect
- Roll wings level
- Rotate to full back sidestick
2 CONFIGURATION
- Verify speedbrakes are in
- Do not alter gear/flap configuration until terrain clearance is assured
3 Climb to safe altitude
4 AFTER EGPWS RECOVERY
- Resume normal flight
My 320 FCOM (6 month old revision) lists two windshear escape maneuvers, one for reactive and the other for predictive. Both recommends to keep the AP if engaged.
Last edited by cynicalaviator; 11-17-2017 at 05:43 PM.
11-17-2017, 06:07 PM
#1677
Da Hudge
Joined APC: Oct 2006
Position: Poodle Whisperer
Posts: 17,473
If he is, the response to a predictive wind shear (WINDSHEAR AHEAD) is to perform a go-around.
AP off and full escape is not required unless you get the reactive warning (e.g. EGPWS- which generates it with inputs from the FACs (FMGECs on the 330) and ADIRUs), or if you satisfy the conditions that necessitate a full windshear escape maneuver.
AP off and full escape is not required unless you get the reactive warning (e.g. EGPWS- which generates it with inputs from the FACs (FMGECs on the 330) and ADIRUs), or if you satisfy the conditions that necessitate a full windshear escape maneuver.
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