Relay removal/install/t'shooting refrence

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Relay removal/install/t'shooting refrence

Postby JetA1 » 25 Aug 2019, 07:29

Good morning,

Just doing a bit of research and reading regarding 737s.

I'm trying to understand where to find the procedure to replace relays and relating to testing/troubleshooting, I have tried searching through the SWPM but this doesn't seem to cover relays just the connectors/wiring to them.

Would troubleshooting just be covered by wiring checks and isolating the fault to the relay?
Then identifiying this from WDM and replacing iaw XXX

Any advice appreciated


Thanks!
JetA1
 
Posts: 9
Joined: 31 Jul 2019, 13:53

Re: Relay removal/install/t'shooting refrence

Postby airknot » 04 Sep 2019, 12:23

Good Morning,
Please, check SWPM 20-30-00 (Installation Torque for Circuit Breaker, Relay, Contactor, and Time Delay Module Terminals) and SWPM 20-81-00.

Regarding testing of relays as themselves - from experience - swap, continuity check acc to scheme drawing on relay or Boeing WDM/SSM.

If talking about t/s in general terms - we checked all relay input signals, than - following circuits.

Best regards
airknot
 
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Joined: 04 Sep 2019, 10:42

Re: Relay removal/install/t'shooting refrence

Postby JetA1 » 05 Sep 2019, 11:15

Thanks for your reply ill have a read through.


Just trying to get my head around the WDM/SWPM side of things a bit more.
Have always been alongside more avionic biased colleagues and had limited involvement, Its a bit of a minefield tieing the two manuals together regarding all the different procedures and processes!

Thanks again
JetA1
 
Posts: 9
Joined: 31 Jul 2019, 13:53

Re: Relay removal/install/t'shooting refrence

Postby JetA1 » 05 Sep 2019, 11:21

Also,
Function testing post relay change for example;
Is there a specific task for this, I cannot see a refrence directing more specifically than just the torque loading as refrenced?

So this would be the correct process;
For example you would troubleshoot, identify relay as faulty due to whatever reason. Find part number off equipment list, move to SWPM and the only info you get is torque loading?

Thanks again
JetA1
 
Posts: 9
Joined: 31 Jul 2019, 13:53

Re: Relay removal/install/t'shooting refrence

Postby airknot » 16 Sep 2019, 09:31

JetA1 wrote:Also,
Function testing post relay change for example;
Is there a specific task for this, I cannot see a refrence directing more specifically than just the torque loading as refrenced?

So this would be the correct process;
For example you would troubleshoot, identify relay as faulty due to whatever reason. Find part number off equipment list, move to SWPM and the only info you get is torque loading?

Thanks again



Affirmative, that's enough info for replacement is SWPM.

Regarding post-installation tests - use WDM/SSM/Hook Up list to identify connected subsystems and based on that determine applicable operational test to perform.
So just analitical process in your mind and of sourse experience to correctly analyze and utilize manuals.
airknot
 
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Joined: 04 Sep 2019, 10:42

Re: Relay removal/install/t'shooting refrence

Postby flyday » 19 Sep 2019, 07:18

operation test for associated system of that relay is enough?
Or the faulty system caused from relay?
flyday
 
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Joined: 20 Nov 2018, 10:30


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