Can I start this post with a plea - that might seem obvious - at a turn point always turn the shortest way to the next track (unless there is something specified to the contrary).
Seems that some people have forgotten this very important principle and the fact that the turn area only protects turns in this direction.
Turns are specified either at a fix or at an altitude.
In this case TGO is a fix where a turn is specified.
This is not a reversal procedure (Procedure turn or base turn). Therefore the requirement to enter +/- 30 does not apply.
The fact that there also happens to be a hold at this fix is simply a distraction.
If cleared to proceed beyond the IAF one must cross the IAF.
If one is in the hold then when cleared for the approach one must route via the IAF and at the IAF turn in the shortest manner to establish outbound from the IAF.
At 5000ft one is terrain safe for the turn shortest way round and since one can not descend to 4000ft until established outbound in terms of when one can descend to 4000ft there is no gain by doing some unnecessary long turn.
Turning the long way round can cause a number of problems. Imagine how far the aircraft is going to drift during all that time when there is a very strong tailwind on the inbound leg of the hold. It is possible that some aircraft turning the long way round could end up pointing at TGO from the northeast. They would then have to cross TGO again (possible from an unplanned direction) and after crossing the fix turn right to establish outbound. The aircraft in this case would be in a situation where it is turning through was was designed as the inside of the turn area and the posibility of going outside the protected airspace is high.
Furthermore, one has to remember that the turn to establish on the Initial Approach segment must be made at a fix. If one continues the hold i.e. turns right at TGO then from the moment TGO is passed the aircraft is no longer tracking any navaid and is operating on DR. One simply compounds the problem here by trying to establish on the Initial Approach leg somewhere west of TGO.
The size of the protected airspace to cope with (the worst case) situation where and aircraft turns the long way round and then DR's to some point west of TGO will be far bigger than the airspace required for a simple turn.
ICAO 8168 is very specific with regard to fix tolerance for the IAF. Turning the long way round can negate the fact that TGO and the Initial Approach Leg complies with those requirements.
So in this case, no matter where one is in the hold, when cleared to proceed beyond the IAF one must route to TGO and at TGO - the specified turn fix - turn the shortest way round to establish on the initial approach.
Remember that the altitudes charted are minimum altitudes. There is no rush to get down to 4000ft just to fly level for an age. While I don't know what the local plan is, Non-Radar, procedural I would not be holding an aircraft at TGO, 5000ft with another aircraft on approach because if there is a missed approach you have a conflict. There is plenty of room to hold 1000ft above the missed approach altitude and once established on the initial approach, just look at all the miles available to loose 2000ft.
If it is not procedural (non-radar) then hey you are going to be vectored!!
