MSFS2024 1.6.5.0. - SimVar “HYDRAULIC PRESSURE” not reporting values when is Legacy based system

[CodenameJack447]

Version: 1.6.5.0

Frequency: Consistently

Severity: High

Marketplace package name: CJSimulations Eurofighter Typhoon or any 2020 or 2024 aircraft not using modular Hyd System

Context: In Flight.

Similar MSFS 2020 issue: No

Bug description:

MSFS2024 - SimVar “HYDRAULIC PRESSURE” not reporting values when is Legacy based

Repro steps:
Use any aircraft that doesn’t implement modular hydraulics system. You can see this, for example, with cjsimulations-aircraft-typhoon 0.3.1.

Attachments:

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Good morning,

I’d like to report that, for the past two days, the legacy-based hydraulic system has not been working in MSFS 2024.

Specifically, the affected variable is the HYDRAULIC PRESSURE SimVar.

In MSFS 2020, it works correctly:

1. SimVar Watcher:

   

2. Eurofighter Typhoon — HYD page:

   

In MSFS 2024:

1. SimVar Watcher:

   

2. Eurofighter Typhoon — HYD page:

   

I’ve also noticed there is no access to the Hydraulics debug page in DevMode
(I understand this might be reserved for the modular hydraulics system).

This is my hydraulics configuration in systems.cfg (unchanged for nearly three years; nothing unusual):

[HYDRAULIC_SYSTEM]
normal_pressure =4060
electric_pumps =2
engine_map =1,1,0,0
ailerons_require_hydraulics=0
elevator_require_hydraulics=0
spoilers_require_hydraulics=0
rudder_require_hydraulics=0

We became aware of this on 13/09.

Thanks in advance.

[FlyingRaccoon]

Hello @CodenameJack447

This should be fixed with SU4 beta 1.6.7.0
Let us know if that’s all good for you.

Regards,
Sylvain

[CodenameJack447]

Hi @FlyingRaccoon, tested and confirmed:

This not only fixes the reporting of hydraulics-related SimVars, but also resolves the issues that arose from them not working:

• Control surfaces that depend on hydraulics now function correctly.
• The braking systems are working again.

So thank you very much for the fix; at the same time, I’d like to offer a suggestion (just my opinion):

There are currently many backward-compatible aircraft in MSFS 2024—more than native projects—that cannot use a modular hydraulic system because it would break their backward compatibility with 2020.

Likewise, there are native aircraft that don’t use a modular system. What I mean is that a modular system should always be an option, not a mandate (and I extend this to the other modular systems you’re implementing).

This bug, along with many others, is a consequence of issuing fixes aimed at a specific set of aircraft (probably your stock/first-party aircraft, or those currently compatible with Career mode). While I know these fixes are made with the best intentions, new bugs arise for the same reason, the broader impact isn’t being considered—certain fixes can break other aircraft, whether first- or third-party, leaving products that suddenly stop working overnight.

I don’t usually report issues for which I’m looking for a solution for my own benefit, as I’ve tested many of your aircraft that come in your stock package before determining there was a bug. If I have to change a line of code, I don’t mind, but when that’s not possible, I have to report it to you, and in this case, the scope extended to a large number of aircraft.

I understand you’re not going to test every aircraft that isn’t yours (that would be unrealistic). But I don’t understand breaking compatibility when something already works correctly.

In this specific case, the modular hydraulic system would have effectively become mandatory, and all backward-compatible aircraft would be broken right now.

All I ask is that you test things more thoroughly.

Thanks in advance.