"A procedure turn is the maneuver prescribed boldwhen it is necessary
to reverse direction/bold to establish the aircraft inbound on an
intermediate or final approach course."

FAA's explanation of the AIM change (August change, not this one)
implies that no PT is required "if the aircraft is aligned within 90
degrees of the inbound course."
(http://www.faa.gov/ATpubs/AIM/Exofchg/exchg3.html.) I couldn't find
the FAA's explanation for the October change, which has not made its
way into FAA's online version of the AIM.