PVI INU update

[sweinhart3]

I know I read the procedure somewhere but now I can find it. What is the procedure for performing the inu fix update or where can I find the instructions for it? I tried locking a position with shkval and pressing one of the inu buttons on the PVI but ekran message still didnt go away.

[StrongHarm]

pg484 or 13-4 of the Pilots Manual:

CORRECTION Mode

The correction mode is used to correct coordinate calculation errors that are caused by inaccurate sensor information and computation. The following correction sub-modes are implemented:

• Fly-over correction
  
• Correction by locking a reference point with the I-251V
  

Fly-over and I-251V corrections are done in reference to up to four INU reference points. Each reference point is set in the mission editor and the coordinates are then input into the PNK. Correction is possible after pressing the “ОР” (Fix point – Update point) button on the PVI-800.

A fly-over correction is accomplished when the helicopter is over one of the four pre-programmed INU reference points, and when near the reference point, pressing the “ОР” (Fix point – Update point) button again on the PVI-800. Then, with the “И-251В - ПРОЛ” (I-251V Shkval – Fly over) switch in the “ПРОЛ” (Fly over) position, press the button with the number corresponding to the reference point on the PVI-800‟s keyboard. The number is then displayed on the PVI display. At the moment of reference point fly-over, press the “ЦУ” (Uncage Shkval –designate target) button on the cyclic and the current computed coordinates are updated with the correct coordinates of the reference point. The light on the “ОР” (Fix point – Update point) button will go off on the PVI-800 and the reference point number indication will extinguish.

Correction mode using a lock by the I-251V is accomplished when within visual range of a reference point after setting the “И-251В - ПРОЛ” (I-251V Shkval – Fly over) switch to the “И-251В” position. When approaching a reference point, press the “ОР” (Fix point – Update point) button again and then enter the INU reference number on the PVI-800 keypad. Turn on the I-251V and slew the sensor‟s line of sight to the selected reference point. The “ИЗЛ – ОТКЛ” (Laser standby – Off) switch on the targeting mode control panel should be set to the “ИЗЛ” (Laser standby) position. Using the IT-23 TV indicator, place the tracking gate on the reference point and minimize its tracking gate to be smaller than the size of the reference point. Initiate an automatic track lock by pressing the “АВТ ЗАХВ” (Auto Lock) button on the collective. After the “ТА” (Tele-automatic lock) symbol is displayed, press the “ЦУ” (Uncage Shkval –designate target) button again on the cyclic. When this is done, the values of the range and the aiming angle (azimuth and elevation) of the reference point are loaded. With this data now known, the coordinates of the reference point are estimated and used to correct the helicopter‟s ownship coordinates. Press the “СБРОС” (Targeting mode reset) button on the targeting mode control panel to disable this mode.

[Bucic]

I read few days ago that INU drift is not modeled thus position fixing is not not needed. Does my memory serve me right?

[Chizzy101]

I read few days ago that INU drift is not modeled thus position fixing is not not needed. Does my memory serve me right?

 

You are right, at the moment INU drift is not modelled in the sim; you can fly around for hours and the PVI stays perfectly accurate. Hopefully drift will be incorporated in the future.

[sweinhart3]

Thanks for the replies. I didnt have a chapter 13 in my book but I printed out the original manual before the updates. I will try the procedure but just now the sim gives me an error when I try to load. Have to reinstall.

 

As far as it not being modelled, I know it comes up on the Ekran but I always wondered why it didnt seem to do anything if I ignored it. If I understand the systems correctly, if the INU is out of wack, then lasing targets, sending datalink, and reaching pvi coordinates would be off wouldnt they?

[Bucic]

Don't forget to get yourself the updated, extended manual from the official site.

[Prophet4no1]

What about the back up ADI? Isn't that controled by the INU? Mine goes bonkers during long flights. At one point the herison was upside down and the aircraft marker was banked at about 80 degrees while in level flight.

[Frederf]

Backup ADI is independent electric instrument that feeds data to the flight safety recorder. It's often necessary to realign the S-ADI several times in flight if doing any hard maneuvering.

 

Right-click hold knob, mouse wheel turn*, release mouse button and wait for the S-ADI to realign. When aligned mouse wheel the other way to uncage the S-ADI.

 

*With default controls mousewheel axis controls ViewZoom and cockpit interaction. This makes it hard to mousewheel interact with the cockpit as the zoom changes while you are attempting to turn a knob. I set my ViewZoom to Mouse3+MouseWheel and left the knob-turning to MouseWheel.

[StrongHarm]

I leave my SADI caged until I need it. Hope I never need it :)

[Shaman]

I leave my SADI caged until I need it. Hope I never need it :)

Imagine you are in clouds or fog, your avionics go fubar, and it happens that your SADI is still caged... this is the only time when you will really need it, but at that particular moment if you uncage it won't help you, it will even make things go even worse.

Don't do that. Uncage and align before flight, and realign it during flight from time to time or when necessary.

These takeoff check-lists in aviation were written with someones blood, remember that ;)

Edited January 26, 2010 by Shaman

[Frederf]

It's technically supposed to be working as often as the pilot can manage as it provides crash recorder data.