The USHPA writes:

Effective September 27, 2016, and continuing until further notice,
USHPA has rescinded its authorization for any pilot to conduct tandem flights
pursuant to FAA Exemption 4721 when those flights are performed in connection
with Air California Adventure, Inc. dba Torrey Pines Gliderport (whether as an
employee, contractor, or in any other capacity).

In addition, USHPA's Tandem Instructor Certification is not valid for tandem
flights taking place at Torrey Pines Gliderport or performed in connection with
Air California Adventure, Inc. dba Torrey Pines Gliderport (whether as an
employee, contractor, or in any other capacity).

USHPA’s decision is based on the following:

ACA's failure to provide USHPA with accident reports for all accidents occurring
during 2015-16.

ACA's failure to cooperate with USHPA in investigation of accidents during
2015-16.

ACA has ceased issuing USHPA 30 day student memberships to participants when
conducting tandem instructional flights.

Under FAA Exemption 4721, all participants in two-place flight must have a pilot
rating issued by USHPA.

ACA is conducting tandem flights that do not comply with all of the operating
conditions of FAA Exemption 4721 issued to USHPA for tandem instructional
flights.