Bug - Landing gear does not extend after turning off engine master switches

[linguisticmind]

Describe the bug
Landing gear does not extend if power to the engines is killed, but the aircraft pitches down as if from the drag created by the extending gear. (I've been turning off master switches in flight to simulate an engine failure.)

To Reproduce
Video demonstration: https://youtu.be/uymG1CogP3c
Steps to reproduce the behaviour:

1. While in the air, turn off the engines' master switches
2. Extend the landing gear

Expected behaviour
Landing gear extending like in the current FGAddon version.

System (please complete the following information):

• OS: Debian Stable (12, Bookworm)
• FlightGear version: 2020.3.19
• A320 Version: dev, 8869ad8

---

I've also noticed that the gravity gear extension handle says "PULL & TRIM" instead of "PULL & TURN". The FGAddon version says "PULL & TURN".

Current:

FGAddon:

[L1011H]

I've also noticed that the gravity gear extension handle says "PULL & TRIM" instead of "PULL & TURN". The FGAddon version says "PULL & TURN"

@linguisticmind This is now fixed, will be available after commit shortly, thanks.

[linguisticmind]

I recorded a video to demonstrate the issue more clearly: https://youtu.be/uymG1CogP3c

@Octal450 If it's not too much trouble, I was wondering if you could take a look. I don't know who gets notifications about comments to this issue. I'm trying to practice engine failures, and there doesn't seem to be an option for that in the 'System Failures' menu. So I've been turning the master switches off in flight to simulate that, and came across this bug. Maybe there is a way to practice engine failures without touching the master switches that I don't know about? Could an engine failure option in the 'System Failures' menu be a feature request?

Also just wanted to say thanks a lot to everyone who is involved in this awesome project for their great work!

[Octal450]

Yeah, I'm not getting notif's since it's not my repo. Best to assign me.

I'll check this out.

Regards,
Josh

[Octal450]

It pitches down due to loss of C* law in DIRECT LAW.

Gear doesn't extend because HYD isn't up and alt gear lever doesn't animate yet.

Kind Regards,
Josh

[linguisticmind]

I see. Thanks for explaining.

I didn't realize that hydraulics wouldn't be able to extend the gear under those conditions. In case someone else is curious, I did some googling, and this answer explains it pretty well.

Hope the gravity extension gets implemented. Is there perhaps some workaround that can be used to extend the gear under those circumstances in the meantime?

[linguisticmind]

Never mind. Got it.

  <!-- Bind Shift-Alt-F9 to gravity gear extension. -->
  <!-- Note: The normal landing gear lever still has to be in the down position. -->
  <key n='265'>
    <name>F9</name>
    <desc>Gravity gear extension</desc>
    <mod-shift>
      <mod-alt>
        <binding>
          <command>property-toggle</command>
          <property>/controls/hydraulic/switches/gear-gravity-ext</property>
        </binding>
      </mod-alt>
    </mod-shift>
  </key>