GI 275 Error(s)

[FJC]

Hi Everyone,

The upgrade of the year was removing vacuum system, removing mechanical AI/HSI, and adding two GI275's. GPSS works like a dream. Yay! 

I need help diagnosing error. GI 275 is showing TRK and not Heading during flight.

I wanted to display the error area in the instruments. Please disregard the TRK FAIL portion on HSI (I was upgrading GTN 750 DB's at the time). I never see TRK FAIL during usage. My question is this...if you look carefully, you will see two yellow circles I imposed on the image...I am seeing white triangles with an ! in both of them. Anyone know how to see or troubleshoot? I've tried digging through the menus, downloading usage data to USB, doing searches, looking at youtubes, etc but to no avail. Thanks.

 

Freddy

[David Lloyd]

The triangle exclamation is just the notification a message is available.  First menu item.  Usually a notice of a database update being needed.  Track and not heading, you're getting the GPS feed but not the magnatometer.  Hopefully the message will give a clue.  The messages on each display are specific to that display.

The GMU11 in mine is connected to the ADI. The configuration summary shows this setup:  

Magnetic Heading 1	Interface	GMU11
	RS-232 RX/TX	Port 1
	Orientation	Aft

[StevenL757]

This......  ^^

[FJC]

Everything I've found points to magnetometer GMU 11. Avionics guy insists that it was installed correctly and ground checked, etc. My plan at this point is to do the basics like check that GI 275 is interfacing with GMU 11, etc. DB update message is plausible. I got a 1 time terrain update from avionics shop but due to the lag in release, its out of date and 275's are rejecting it.

Anyone else in the bay area have two of these installed and can recommend a nearby shop?

I'm sorta on my own on this until I identify a new shop to finish shaking down this install.

Thank you.

Freddy

[RobertGary1]

I learned to ignore those as you always have an error message that your navigation database is out of date even though you can’t use the nav database jn that config. But yes look at the messages

 

also I always encourage people to have some attitude backup if you fly imc. A vacuum attitude is a cheap way of doing that. Every AHRS based solution has had software bugs at one point or another. Garmin just provided a patch for a couple of us that saw this. Software bugs will always be there. 
 

[wombat]

https://www.bst-tsb.gc.ca/eng/rapports-reports/aviation/2021/A21P0001/A21P0001.html is the Air Transport Canada report on this incident.

https://www.beechtalk.com/forums/viewtopic.php?f=21&t=198092 is the beechtalk thread about it.

 

There is no mention that there was actually a dual failure.    There was a single failure, and the second one was configured in a way that it could not be reverted to provide attitude or turn information.

 

@RobertGary1   Based on 49 CFR 830.5 your incident required an immediate report to the NTSB:  https://www.law.cornell.edu/cfr/text/49/830.5

(9) A complete loss of information, excluding flickering, from more than 50 percent of an aircraft's cockpit displays known as:

(i) Electronic Flight Instrument System (EFIS) displays;

(ii) Engine Indication and Crew Alerting System (EICAS) displays;

(iii) Electronic Centralized Aircraft Monitor (ECAM) displays; or

(iv) Other displays of this type, which generally include a primary flight display (PFD), primary navigation display (PND), and other integrated displays;

 

[jlunseth]

Me too. I intentionally kept a vacuum operated AI.