CFM56-7 hybrid identification plug

For the CFM56-7 engines a “hybrid” or configureable identification plug is made because the old identification plug requires replacement in the case of an engine configuration change.

The new plug allows operators to change some of the engine configuration parameters in the plug without replacing it.  This is done by changing “push-pull” contacts position for the following engine configuration parameters only:
-Burner staging valve (BSV) system functional or not (SAC engines
-N1 trim level.
-SAC / DAC engine type.

So the thrust setting CANNOT be changed by this plug, only the mentioned parameters.

Below you find a photo of such a hybrid plug. When the pin is “pulled” it means it is NOT activated or “open”.  When the pin is “pushed in” it means it is active or “closed”. You have to make sure the pins are completely pulled or pushed. A pin may be “halfway”, that is not correct.


 All information, handling instructions and pin-configurations can be found in CFM56-7B Service Bulletin 72-0106  and not in your AMM.

Do not forget to lockwire the cap after installation on the plug. You can check the configuration in the CDU in the engine byte check pages.

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