T6NL

T6NL is a code for an airplane engine over temperature condition. "T" stands for temperature, the number six refers to stage six, "N" stands for shaft rotation speed in the engine and the "L" stands for low pressure. Stage six refers to the engine temperature and low pressure shaft speed.

T6NL can be caused by many things such as an object being sucked into a jet turbine (such as shrapnel or a bird strike), it can be caused by vibrations in the turbine or by a worn down turbine. In some cases it could be a major flight failure.

References

* [http://www.youtube.com/watch?v=ijsCAeGMiBw Cockpit Video (YouTube)]
* [http://www.airforce.forces.gc.ca/dfs/docs/Fti/CT155202_e.asp Air Force Official Report to the above video]
* [http://www.pprune.org/forums/printthread.php?threadid=184408 Discussion]