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Textron Aviation SEB-34-20 Revision 1 - Navigation-G1000 w/ESP

April 28, 2021

Textron Aviation has issued mandatory service bulletin, SEB-34-20.  This SB applies to certain Cessna 172S aircraft (serial numbers 172S12246 thru 172S12463) that have G1000 NXI with ESP software version 2501.03 thru 2501.09 installed. This SEB affects 10 of our 2019, 172S aircraft.  See attached for a list of tail numbers.

The Electronic Stability Protection (ESP) will command a nose down pitch when the aircraft is in-air and airspeed remains below 55 KIAS for at least one second (Low Airspeed Protection). If ESP remains engaged for 10 seconds (non-consecutive) in a 20 second interval, the system will engage the Autopilot (AFCS) in LVL-LVL mode, which then enables automatic pitch trim authority. This can be unexpected when intentionally operating the airplane in some flight conditions such as during training flights with slow flight maneuvers and power off stalls, or with erroneous airspeed indications.

Please have this mandatory service bulletin completed at the next 100hr/Annual inspection.  This software update is covered under warranty and must be completed no later than 7 Oct 21 for CAP to be reimbursed.  If the 100hr/Annual inspection does not come due before this date please get your aircraft scheduled in to have this update done out of cycle so that it will be covered.  A discrepancy has been created in AMRAD to track the completion of this SB.  When it is completed please closeout the associated discrepancy.

See SEB Here:  Link 

For More Information:

For More Information:

Rodger Kirkpatrick


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