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Old 06-04-2018, 07:30 PM   #1
duesensegler
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Default FCS BIT problem

When trying to shut down and restart the Hornet, I noticed that I could Brick the FCS.

I go into one of the ready on the ramp mission, no matter what map, and shut down the Hornet according to the Natops manual (Page 340-350) which you can find at this link.


https://info.publicintelligence.net/F18-ABCD-000.pdf


I then restart the Hornet according to the Natops manual(Page 321-325). When on step 6 (Page 325) the flaps are raised from the FULL position to the AUTO position you can already see on the FCS DDI page, that the left leading edge flap doesn´t raise up from its 12° down position, but rather stays there while the right one goes up to the 0° position. If I then initiate the flight controls system check by pressing the FCS RESET and the FCS paddle switch at the same time, already only one side of the surfaces are
moving. By then initiating the FCS BIT, like adviced in the NATOPS manual, the plane seems to get stuck in the FCS BIT and none of the surfaces react any more, neither to stick and rudder inputs, nor to flap switch commands.
I know most players are probably not gone encounter this BUG, but it might be a symptom of a bigger FCS issue.
Attached Files
File Type: zip Logs.zip (235.7 KB, 9 views)
File Type: trk F-18 FCS BUG.trk (225.1 KB, 8 views)
File Type: zip System.zip (70.9 KB, 7 views)
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Old 06-04-2018, 08:22 PM   #2
Chops
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I have a few questions regarding the checklist steps you mentioned, and will try to replicate the issue.

Pg. 324
5. FCS RESET button - PUSH
If the wings are folded, verify aileron Xs are present.

Pg. 325
6. FLAP switch - AUTO

7. FCS RESET button and paddle switch - ACTUATE SIMULTANEOUSLY (what is the key command for the Paddle Switch?)

8. FLAP switch - HALF

9. FCS INITIATED BIT - PERFORM (Is this check completed by pressing FCS-MC > FCS on DDI and Y key command - FCS Bit switch simultaneously?)
a. AOA warning tone - VERIFY ANNUNCIATION AT FCS IBIT COMPLETION
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Old 06-05-2018, 08:36 AM   #3
duesensegler
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The default key for the paddle sitch is Y(Z if you use a european keyboard).
Yes the FCS Bit is initiated by going to the DDI FCS Bit page and pressing the FCS button there and the paddle switch(Y) simultaneously.
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Old 06-06-2018, 04:04 PM   #4
Chops
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I tested this procedure and found the same problem during start-up, however, it was due to pilot error. I realized that I left NWS steering on.

See the following note from the NATOPS Manual -

Pg. 243

NOTE
• For initiated BIT to start, FCS BIT consent switch must be held for at
least 2 seconds. If not held for the required time, RESTRT is displayed
as the BIT display status message. If RESTRT displayed, repeat
procedure.

• Initiated FCS BIT cannot be performed if nosewheel steering is
engaged.

• For valid BIT reporting, do not operate switches or controls unless
indicated. Do not rest feet on rudder pedals or hands on control stick.
1. If wings folded, check both ailerons Xd out.

Here are the key bindings that I assigned in Control Options -

FCS Reset Button (Left Console) – B key

FCS Bit Switch (Right Vertical Panel) – Y key

Paddle Switch (Control Stick), this is called Autopilot/Nosewheel Steering Disengage (Paddle) Switch in the DCS Control Options – A key

I followed the NATOPS checklist as follows and successfully completed the test:

Page 324

5. FCS RESET button – PUSH Press B key
If the wings are folded, verify aileron Xs are present

6. FLAP switch – AUTO

7. FCS RESET button and paddle switch - ACTUATE SIMULTANEOUSLY Press B key and A key at the same time

If nosewheel steering (NWS) is engaged the following FCS Bit test won’t work properly. Make sure NWS is no longer displayed on the Heads Up Display (HUD)

8. FLAP switch – HALF

9. FCS INITIATED BIT – PERFORM Press Y key for 2 seconds, continue to hold and press the FCS-MC > FCS OBS button on the right DDI at the same time until you see IN TEST displayed on DDI then release both key presses.
a. AOA warning tone - VERIFY ANNUNCIATION AT FCS IBIT COMPLETION
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Old 06-06-2018, 04:19 PM   #5
AMVI_Grape
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Thank you Chops for this detailed information.
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Old 06-07-2018, 05:24 PM   #6
duesensegler
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Just tried it out myselfe. It seems to be fixed, if you watch the track that I attached you can see that I had the NWS turned off.
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Old 06-12-2018, 01:39 PM   #7
duesensegler
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Reload the mission or chose another plane.
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Old 06-17-2018, 12:35 AM   #8
umkhunto
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Today I experienced this exact issue. It seems to happen when you perform a full shutdown then start up. I've done manual start ups and auto start ups.

I've tried Paddle and FCS reset, no joy.
Cycled repeated paddle and FCS reset.
Tried FCS test consent(y) with FCS reset at the same time.
Tried all of above steps, with all 3 flap settings.
Tried all the steps with NWS on and off.
In none of the above attempts could I get the FCS to complete a BIT nor could could I get my flight surfaces to move.

Bit annoying that you have to respawn after every landing.
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Old 06-17-2018, 10:43 AM   #9
muxmuni
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FCS - RESET on the left panel, is clear the BLIN code on the FCS Page.

Now is dosen't work.

For information if you perform a electrical reset or pull all FCS circuit breaker more than 10 seconds. The flight computer loose the last status. In fact on the BIT FCS page the FCC A and B come PBIT GO. And you need to press again to the T / O Trim because the STAB comeback at the initial position.
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Old 06-17-2018, 11:27 AM   #10
Hippo
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I realise that this has been explained but just to be clear as there are some contradictory posts:

  • FCS BIT consent switch (on right cockpit wall): key Y.
  • autopilot/nosewheel steering disengage lever (Paddle switch) (on HOTAS): key A.
  • 2.8.2.2.8 FCS RESET Button. The FCS RESET button on the FCS panel is used to reset the flight control computers after a transient malfunction. (there is no key assignment for this by default, at least on my system).
Looking through the NATOPS one of the steps is explained clearly:

2.20.3.5.1 FCS Initiated BIT. For the FCS, the FCS BIT consent switch, on the right essential circuit
breaker panel, must be held ON when initiated BIT is started. This prevents inadvertent initiation of
BIT on the FCS for reasons of flight safety.

However, it is not clear to me what the following action achieves:

7. FCS RESET button and paddle switch - ACTUATE SIMULTANEOUSLY

All I can find is

"Pressing the FCS reset button, simultaneously with the paddle switch, does not correct BIT detected flight
control system failures; it simply clears the BLIN code(s) from the display."

So, what is the difference between pressing FCS RESET (alone) and pressing FCS RESET with the paddle switch?






Also related:

2.8.2.4 Actuator Exerciser Mode. An actuator exerciser mode is incorporated to improve cold
weather start-up of the FCS. On the ground, the pilot can initiate the exerciser mode by simultaneously
holding the FCS BIT consent switch ON and pressing the FCS RESET button. When initiated, the
mode cycles the stabilators, flaps, ailerons, and rudders through 20% of full travel for 10 cycles in 20
seconds. The operation can be stopped before 20 seconds have elapsed by pressing the paddle switch.
The mode should be used in cold weather or any time an initial FCS RESET fails.
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Last edited by Hippo; 06-17-2018 at 11:44 AM. Reason: clarity
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