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Vhf&hf Radio Requirments On Commercial Aircraft  
User currently offlineCc2314 From Ireland, joined Jan 2008, 165 posts, RR: 0
Posted (8 years 4 months 3 weeks 20 hours ago) and read 4723 times:

Just a quick question,does anyone know what the requirements are for civil aircraft passing over ocean to be equipped with hf radio.To give an example i know a 737 fling from agp to dub must not be routed over the bay of Biscay but instead be sent over mainland France.

Can anyone tell me a little more about this if so that would be great!!

2 replies: All unread, jump to last
User currently offlineThrottleHold From South Africa, joined Jul 2006, 739 posts, RR: 1
Reply 1, posted (8 years 4 months 3 weeks 18 hours ago) and read 4705 times:

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.

User currently offlineCc2314 From Ireland, joined Jan 2008, 165 posts, RR: 0
Reply 2, posted (8 years 4 months 3 weeks 16 hours ago) and read 4696 times:

Sorry my mistake,my original post should have stated that the 737-400(tf-elp) had no hf radio working,so the pilot asked me to notify dispatch about this problem and have them route the flight plan over mainland france....all the while i though that vhf would have been sufficient...cheers for your response

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