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Posted

Other than battle damage and overstressing the jet, the latter of which often requires something like 10G+, what are some other causes of bending the avionics?

I ask because I manged to do it by pulling 4.1G, max 5.4G in the whole 15-minute flight.

Launch off the carrier, CASE I departure, some cloud surfing where I pulled 5.4G according to the gauge, no problems. Pull up, roll inverted, pull 4.1G (per Tacview), and at some point during that pull my HUD got cocked about 30 degrees, VSI got flipped upside down, and the HSI froze. No warning lights except for VOICE. The only thing I can think of is I fogot to turn off Roll SAS, but what else could have bent my avionics with such mild aerobatics?

 

Posted

One other thing I can think of is that there is a very small chance that cat shot can mess up IMU. Cant recall that ever happening to me, but maybe you were (un)lucky in that regard. 

Posted

In my experience, hard negative Gs impact the INS more than positive Gs. I suspect you bent the INS with your negative pull

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Posted (edited)

Random failures on per chance? He is also right above I’ll have the cat shot knock up the imu occasionally.

Edited by grant977
Posted
2 hours ago, lbellouny said:

I suspect you bent the INS with your negative pull

Inverted then pull is positive, not negative. Accelerometer was around +0.2G on the low end, +5.4G on the high end. No negative G the entire flight.

1 hour ago, grant977 said:

Random failures on per chance?

Failures off unless there's a gremlin in the latest patches. The cat shot theory sounds plausible. The other day I had GLOC on a cat shot completely out of the blue. Never had that before.

Posted

The Gloc thing on cat shots has been around for like a year, it's not new. I still don't know what causes it or how to reproduce. It happens a lot to me but it's never bent my INS. 

I have no idea what could've bent yours if you followed startup procedures and didn't over G.

Posted
4 hours ago, Despayre said:

What is the GLOC thing?

When the holdback bar is released you GLOC and regain vision as you're nearing the end of the cat stroke.

Posted
14 hours ago, Despayre said:

What is the GLOC thing?

G-force induced loss of consciousness, but the catapult one is very short, like 1-2s.

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Posted

I would characterize it as a head rush. I had it happen too few times, totally random it seems, and it has nothing to do with IMU breaking as far as I can tell, mine was OK after. 

Posted

Could it be a combination of GLOC on cat shot + medium G manuvers? My IMU was fine for about 10 minutes after the cat shot, then suddenly broke during that +4G pull. 

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