AC90-100A, Appendix 3, Para. 10 a, b and c
a. The aircraft must have the capability to automatically execute leg transitions and maintain tracks consistent with the following ARINC 424 path terminators, or their equivalent:
• Initial Fix (IF)
• Course to Fix (CF)
• Direct to Fix (DF)
• Track to Fix (TF)
b. The aircraft must have the capability to automatically execute leg transitions consistent with VA, VM and VI ARINC 424 path terminators, or must be able to be manually flown on a heading to intercept a course or to go direct to another fix after reaching a procedure-specified altitude.
c. The aircraft must have the capability to automatically execute leg transitions consistent with CA and FM ARINC 424 path terminators or the RNAV system must permit the pilot to readily designate a waypoint and select a desired course to or from a designated waypoint.
From the KLN90B Pilot's guide:
Even though the database contains
SID and STAR procedures, there is a lot of information
that is not included in the database. Therefore, the paper
chart is still the primary source of information. For example,
many procedures require the aircraft to fly to a certain
altitude, along a heading until intercepting a course, and
many other procedures that the KLN 90B can not automatically
accomplish. Many procedures require pilot
action to ensure that the proper path is flown over the
ground.