When the S-Tec System Fifty Five SR (55SR) Autopilot is installed in the Cirrus Design SR20, serials 1337 and subsequent, this Supplement is applicable and must be inserted in the Supplements Section (Section 9) of the Cirrus Design SR20 Pilot's Operating Handbook. This supplement is not included with the purchase of a POH and must be ordered separately. Note: This item is drop-shipped to you directly from our vendor.