|Quoting Cc2314 (Thread starter):|
To give an example i know a 737 flying from agp to dub must not be routed over the bay of Biscay but instead be sent over mainland France.
Incorrect. 737's regularly route from that area over both mainland France and the Bay.
I think you may be confusing flying over the Bay of Biscay with routing along the T9
Airway. The Bay of Biscay is under radar control and VHF communication by the Madrid and Brest ATC Centers. The T9
Airway is just a little further west and enters the Shanwick OCA, albeit for anly a short section. Between LASNO and BEGAS if I remember corectly.
There are requirements that must be met to fly in the OCA's, known as MNPS (Minimum Navigation Performance Specifications). One of these stipulates the use of HF
communication. Others set out the minimum onboard navigation equipment required. The 737-(300-500) doesn't actually fulfill some of these criteria relating to the number of independent navigation systems required. I can't actually remember the specific detail, but as far as I recall it was to do with the fact that the 737-(300-500) has only 1 Flight Management Computer, although input is available through the 2 CDU
's. As opposed to the A320 which has 2 seperate and independent FMGEC's.
However, there is an exemption in place which allows the 737-(300-500) to enter the Shanwick OCA along the T9
Airway so that flights to the Canaries and that area can be operated.