G900X, G950, G1000(H), Cirrus Perspective, and Embraer Prodigy products with GDU software version 12.20 and later, and all G2000, G3000, G5000(H), and Embraer Prodigy Touch products are affected.
Some procedure legs in terminal procedures may be calculated and depicted incorrectly, if either a manually-sequenced leg type (identified by "MANSEQ") in the flight plan, or a leg identified with an altitude value in the flight plan is activated manually.
MANSEQ and altitude procedure leg types work as intended within any flight plan as long as they are not manually activated.
Altitude leg formats may differ depending on airframe configuration (e.g. ####FT or (####)).
When this condition occurs, the FMS will provide lateral guidance along an incorrectly calculated procedure leg (see attached Service Advisory).
Do not manually activate any procedure legs identified by either an altitude or the abbreviation "MANSEQ." If the condition occurs, remove and replace the affected procedure.