Originally Posted by
mmm345
Heres a hypotheical situation: Planning a IFR charter from Bankstown to Cessnock ( AD north of Sydney near Williamtown).
Cessnock does not have any published IAP, nor nav aids, Nor TAF- however is quite a busy training a GA airport.
By day ( refer ENR 1.10 -1.4.1)- you can plan to a non IAP destination IFR if firstly you can navigate to the destination via an area navigation syste ( ie. GNSS) or visual reference ( since there are no nav aids at the destination ( ENR 1.1 4.1.1 IFR Navigation). So we can fly to the destination, but do we need an alternate.
ENR 1.10 states to refer to the alternate minima in ENR 1.1 11.7.2.12. In this reference, we refer to Clause C), since there is no published IAL chart. It states the Alternate minima is LSALT+5 and 8km visibility for the final route segment. Since the last route segment will probbley be via a waypoint MAKOR, the last route segment is well outside a TAF 5nm bubble ( irresepective of the fact we dont even have a TAF at Cessnock). Hence we consult the GAF for the area and see the lowest cloud we can expect is hypoteically FEW clouds 5000/ 7000, which happens to be above our final routes segment LSALT+500ft. Visibility isnt a problem based on the GAF.
So, we dont need an alternate since we are above the alternate minima for weather conditions.
<SNIP>
Does anyone see if im missing something major here or got something very wrong??.
Yes.
Per AIP ENR 11.7.1.3, you are using the
GAF to determine destination weather, however, 11.7.1.3 requires you to use an
aerodrome forecast which is referenced to a
TAF. Cessnock has no TAF so you must plan an alternate to Maitland, if Maitland itself does not require an alternate due weather.
It's a ridiculous situation where you cannot use the GAF for arrival weather, but so long as that AIP says "
aerodrome forecast" you have to have a valid TAF to be able to determine if the weather will be above the Alternate Minima.
I'd like to know what idiot wrote that such that I can't use the GAF!