Fool proofing chain broken

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3 months 3 days ago #1545 by dynamics
What does "fool proofing chain broken" mean?

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3 months 3 days ago #1546 by Mark
Replied by Mark on topic Fool proofing chain broken
I've never heard the term????

Is that written in a manual?

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3 months 3 days ago - 3 months 3 days ago #1547 by dynamics
Replied by dynamics on topic Fool proofing chain broken
It is one of connector discrepancies which can be detected by GVI.please go to page 84 of file I have just sent
Last edit: 3 months 3 days ago by dynamics.

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3 months 3 days ago #1548 by Mark
Replied by Mark on topic Fool proofing chain broken
Still need a reference. I dug into the Standard Wiring Practices Manual..... no mention of the phrase.

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3 months 3 days ago - 3 months 3 days ago #1549 by Mark
Replied by Mark on topic Fool proofing chain broken
Page 84.....
  
  
 

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The only time I've seen a chain is in reference to a programming pin adapter plug that must stay with the aircraft when a component is changed.

Two examples are the engine FADEC units and the newer Standby (Attitude, Heading, Altimeter, Airspeed) Indicators in the cockpit.

Engine specific strapping (or coding) is on one plug that attaches to the FADEC. It is chained to the engine.

Aircraft specific data is coded to a plug that connects to the Standby Indicator. A chain connects it to the aircraft wiring harness and not the instrument.

Here's a picture of a FADEC unit. I'll have to take a pic of one (with the programming plug) on an actual engine.
  
  
 
  
 
Last edit: 3 months 3 days ago by Mark.
The following user(s) said Thank You: dynamics

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3 months 3 days ago #1550 by dynamics
Replied by dynamics on topic Fool proofing chain broken
Patent No.US20100167567
is a connector with foolproof structure that is protruded inside the receiving hole for blocking an insertion of an incompatible plug

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3 months 3 days ago #1552 by dynamics
Replied by dynamics on topic Fool proofing chain broken
So engine characteristics plug is chained to engine to prevent connecting wrong plug by fools so the chain is foolproofing structure, correct me if I'm wrong.

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3 months 3 days ago - 3 months 3 days ago #1553 by Mark
Replied by Mark on topic Fool proofing chain broken
I'm just giving you my best guess on this question.

Plugs use alignment keys to keep it in the correct position before tightening down. There is no chain.

The alignment keys make sure that the wrong plug is not installed on a specific receptacle..

The keys are different on each plug if a large number of plugs are in one area.
  
  
 
  


The only chains I've seen are used on the programming plug mentioned above.
Last edit: 3 months 3 days ago by Mark.

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