Blueyonda,
With regards to your comment about airside sign positioning on hangars, is there a reference in the transport security Act or Regs that reflects your comment or is it in TSP's?
Whether the boundary is on the landside or airside doors of something like a hangar would be largely determined by the Security Risk Assessment (SRA) for that particular airport or facility. I would think it is covered in 3.15
Aviation Transport Security Regulations
3.15 Requirements for airside generally
(1) The requirements for the fencing of, and the provision of other
physical barriers to entry to, the airside area of a security
controlled airport are:
(a) subject to subregulation (2), a barrier sufficient to
delineate the airside area; and
(b) effective access control points to permit authorised access
to the airside area; and
(c) patrolling, electronic surveillance or any other suitable
measures to inspect the barriers for damage and to deter
and detect unauthorised access to the airside area; and
(d) if possible, illumination of the aircraft parking area while a
prescribed aircraft is parked there at night; and
(e) signs, each at least 0.4 m wide by 0.3 m high, and
otherwise complying with subregulation (4), and in the
number required by subregulation (5), fixed to the barrier;
and
(f) a sign at least 0.4 m wide by 0.3 m high, and otherwise
complying with subregulation (6), at every entrance to the
airside.