Manual contradicts itself on the use of "INU Heater" switch (“ОБОГРЕВ ИКВ – ОТКЛ”)

[zerO_crash]

Hi,

 

I have noticed a mistake in the manual for BS3. First, look at the section 6-95. Specifically, points #6 and #7:

 

6. - “ИКВ – ОТКЛ” (INU – OFF) switch. Inertial Navigation Unit (INU) power. INU starts alignment procedure automatically upon power on [RCtrl + RAlt + I]."

7.  - “ОБОГРЕВ ИКВ – ОТКЛ” (INU heater – OFF) switch. This switch is turned on prior to Inertial Navigation Unit (INU) alignment and must be enabled during INU operation. No function."

 

Point #6, specifically states that INU starts alignment as soon as this switch is flipped to "INU"-position. Point #7, states further that "INU Heating" must be turned on prior to starting INU-alignment (#6). So far so good, and this is pretty much correct as per book. However, correlating this with the new section on INU-alignment (9-5 and onwards), you both describe and show pictures of INU-power switch being turned on, before "INU Heater"-switch. This section contradicts then the aforementioned procedure (6-95). Again, seeing how INU Heater is not working, it's anecdotal, however, it's still wrong as per procedure.

 

zerO

[kotor633]

 

[zerO_crash]

EDIT: Seems like INU heating does not work afterall. This is then a bug report purely for the aesthetics of the manual, and knowledge of proper procedures.

Edited March 16, 2024 by zerO_crash

[PawlaczGMD]

The order of this switchology really doesn't matter. The INU will not break if not heated for a few seconds. Just turn both on before takeoff.

[Dragon1-1]

I imagine in cold weather starts it could well be important. In such cases, the heater could be turned on well before the alignment to avoid INU trying to start up when cold. Does it actually work that way in the sim?

[LuseKofte]

I learned startup with a YouTube tutorial. And in this tutorial in heater switch was to be started first 

So I believed it was the official procedure. However I forgot to use it in many occasions 

I never encountered any problems not switching it on. It might work but consequences of not using it has yet to be seen

[zerO_crash]

On 2/15/2024 at 5:35 AM, PawlaczGMD said:

The order of this switchology really doesn't matter. The INU will not break if not heated for a few seconds. Just turn both on before takeoff.

 

Actually, it does matter. While DCS doesn't simulate it, per real-life procedures, INU heating is to be turned on prior to starting the alignment of the INU. This matters all-year around, however primarily, during winter. The reason being; any gyro will have ball and roller bearings which are lubricated with some form of oil (low viscosity). Not heating up the bearings properly, will increase the alignment time, and might actually introduce a certain (miniscule) error into the alignment. Again, DCS does not model this until now, however for a purist (IRL operations), this is essential to know.

 

On 2/15/2024 at 1:28 PM, LuseKofte said:

I learned startup with a YouTube tutorial. And in this tutorial in heater switch was to be started first 

So I believed it was the official procedure. However I forgot to use it in many occasions 

I never encountered any problems not switching it on. It might work but consequences of not using it has yet to be seen

 

Same answer as above. As to official youtube procedures, there are the ones from made by Wags for the first iteration of Ka-50. Regardless of that, the manual will be the proper place to look for an exact procedure, as private one often do not respect the order of systems turned on (little respect is paid to what systems are allowed to be turned on in which sequence). If realism is to be simulated, then manuals are the way to go (otherwise - pilots who have experience with the type). Eventually, intimate knowledge of the different systems, and what minimums for voltage they tollerate. For anything less than realism, you can basically do your own startup, and test what works and what doesn't.