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RJ100/ALF507 Soft Fault

Old 3rd Jun 2014, 14:27
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Join Date: Jun 2014
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RJ100/ALF507 Soft Fault

Howdy,

Newish Avro operator, with previous experience on the 146. Hoping some European experts with a little more experience with these engines can shed some light.

We seem to be constantly getting the ARINC429 Soft-Fault (Code '4' in the window) across all four engines. ECU has been changed on #3 for troubleshooting, with engine harness checked (Don't have the manual in front of me but can get you harness number if required). Still same behaviour.

Reset FADEC fault and do a run - still no change. Code 4 shows up.


In addition, crews some-time complain of the autothrottle not reaching the N1 target. When it does occur it's around +/- 1.5% of the target N1. Related to above?

Is it something to be concerned with? Is this a typical soft fault on these aircraft? Should we be looking somewhere else like the DFGC's or airframe wiring?

Cheers!
plhought is offline  
Old 14th Jun 2014, 19:01
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Join Date: Oct 2006
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Hi,

If I remember well the codes 4 and 8 are always alternating on the fadec when the engine is not running this is normal. Soft faults on the soft fault indicator are normally just reset, can be misleading. Remember it's a old simple system. In respect to the N1 shortcoming, is it always the same engine? If yes check if the resistor is not open circuit and you have normal indication in the cockpit, amm gives you a list of the resistance for each dash number. Cockpit indication should not be 0. Hope this helps, otherwise I come over and give you guys OJT on the RJ'S, always available as contractor. ;-)
fixaBAe146 is offline  
Old 16th Jun 2014, 02:15
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Join Date: Oct 2006
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The only thing you need to worry about is the codes that are between 4 and 8 those are the real fault codes.
fixaBAe146 is offline  
Old 16th Jun 2014, 13:09
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Cheers for the info!

Pretty much what I figured. Knew Code 8 was the standard display check, but just wanted to clarify with Code 4. Thanks again for the heads up!

The N1 shortcoming was reported as across all four, although it hasn't been reported for a good few weeks now. It was snagged along with a bleed hogging issue that we dealt with that evening, and couldn't fault the AT or FADEC during the requisite engine runs.

Once again cheers for the help!
plhought is offline  
Old 16th Jun 2014, 16:05
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Join Date: Jul 2010
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Hi,

If you join Queen of the Skies - BAe/Avro 146RJ Appreciation Group on FB, you'll find a lot of knowledgable RJ/146 engineers willing to help.
hvdkelen is offline  
Old 18th Jun 2014, 03:42
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Thanks for the reply.

Took a peek at that Facebook group. Some great stuff on there!
plhought is offline  
Old 11th Jun 2016, 13:02
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Join Date: Oct 2014
Location: Tehran
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AVRO RJ MEL

Hi
I was wondering if anybody can send me a customized version of MEL
Fly_high_club is offline  
Old 14th Jun 2016, 06:05
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Join Date: Apr 2008
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It has been a while since I worked on the RJ100, however if I remember correctly the TMS actuator or down that part of the engine can be faulty.
Engineer_aus is offline  
Old 26th Jun 2016, 14:59
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No TMS actuators on the 507-1Fs...

All done in the FADEC.
plhought is offline  
Old 4th Sep 2020, 06:31
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Join Date: Mar 2005
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RJ UK MEL (EASA)

[QUOTE=Fly_high_club;9405518]Hi
I was wondering if anybody can send me a RJ MEL. i have FAA one but i do need uk Version
aryo barghi is offline  

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