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UAL Oceanic Ops. Question  
User currently offlineDreamflight767 From , joined Dec 1969, posts, RR:
Posted (9 years 7 months 6 days 5 hours ago) and read 3779 times:
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Hi Crew:

First off, Happy New Years!

Secondly...

When I monitor my scanner, I hear every airline heading over the Pacific Ocean pick up their oceanic HF frequencies, complete selcal checks, and gather other clearance information from San Francisco Radio (AIRINC) except UAL.

Does UAL use sperate frequencies other then 131.95 and 129.7? Or do they use ACARS?

Thanks!

Aaron

26 replies: All unread, showing first 25:
 
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 1, posted (9 years 7 months 6 days 4 hours ago) and read 3770 times:

Quoting Dreamflight767 (Thread starter):
When I monitor my scanner, I hear every airline heading over the Pacific Ocean pick up their oceanic HF frequencies, complete selcal checks, and gather other clearance information from San Francisco Radio (AIRINC) except UAL.

You won't hear SQ doing it. All of our aircraft are CPDLC equipped, so the only thing required is a SELCAL check, after that everything is done through data link.


User currently offlineDreamflight767 From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 7 months 5 days 21 hours ago) and read 3718 times:
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Interesting...what is CPDLC? I'm up to date on the data link though! Thanks.

User currently offlineLaxintl From , joined Dec 1969, posts, RR:
Reply 3, posted (9 years 7 months 5 days 20 hours ago) and read 3703 times:

CPDLC = Controller Pilot DataLink Communication

User currently offlineCALPilot From , joined Dec 1969, posts, RR:
Reply 4, posted (9 years 7 months 4 days 22 hours ago) and read 3583 times:

CO is CPDLC too. I only get the SELCAL ck.

User currently offlineRobK From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 7 months 1 day 16 hours ago) and read 3425 times:

Aaron, if you want to know which aircraft you're listening to after hearing the selcal code, you can look them up on my website at http://www.selcalweb.co.uk.

18,100+ individual selcal-equipped frames - you'll be hard pushed to hear one that isn't listed! If you do, send it along to me and I'll see what I can do!

Cheers,

RK  spin 


User currently offlineHAWK21M From , joined Dec 1969, posts, RR:
Reply 6, posted (9 years 7 months 1 day 14 hours ago) and read 3400 times:

RobK the links not working.
regds
MEL


User currently offlineRobK From , joined Dec 1969, posts, RR:
Reply 7, posted (9 years 7 months 1 day 13 hours ago) and read 3397 times:

Quoting HAWK21M (Reply 6):
RobK the links not working.

It's because I accidentally put a dot at the end of the link.

http://www.selcalweb.co.uk try that.

RK  spin 


User currently offlineHAWK21M From , joined Dec 1969, posts, RR:
Reply 8, posted (9 years 7 months 1 day 13 hours ago) and read 3391 times:

Thanks.Interesting link.
It worked with the Aircraft in our fleet.
regds
MEL


User currently offlineRobK From , joined Dec 1969, posts, RR:
Reply 9, posted (9 years 7 months 1 day 12 hours ago) and read 3381 times:

Quoting HAWK21M (Reply 8):
Thanks.Interesting link.
It worked with the Aircraft in our fleet.

What fleet is that then Mel?  confused 

RK


User currently offlineDreamflight767 From , joined Dec 1969, posts, RR:
Reply 10, posted (9 years 7 months 1 day 10 hours ago) and read 3362 times:
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Thanks! That is really cool!

Have a great night.

Aaron


User currently offlineHAWK21M From , joined Dec 1969, posts, RR:
Reply 11, posted (9 years 7 months 1 day 3 hours ago) and read 3339 times:

Quoting RobK (Reply 9):
What fleet is that then Mel

BDA now DHL
VT-BDE
VT-BDF
VT-BDG
VT-BDH
VT-BDI
All Aircraft SELCALs were present.
regds
MEL


User currently offlineSuseJ772 From , joined Dec 1969, posts, RR:
Reply 12, posted (9 years 7 months 14 hours ago) and read 3274 times:

Alright, I'll be the stupid one and ask what is SECALs? Is it like a specialized frequency? I have a pretty good understanding of VOR, ILS, etc... but when it comes to transcontienetal travel I am not too educated. What is the Oceanic HF? ACARS? How does CPDLC work?

User currently offlineSuseJ772 From , joined Dec 1969, posts, RR:
Reply 13, posted (9 years 7 months 14 hours ago) and read 3267 times:

Alright, after reading the "About" section at http://www.selcalweb.co.uk I have learned a little more about how selcal works, but how is that different from the others? It almost sounds like selcal is really "old fashioned" (pardon the statement if that is in some way offensive).

User currently offlineHAWK21M From , joined Dec 1969, posts, RR:
Reply 14, posted (9 years 7 months 8 hours ago) and read 3242 times:

Is there any SELCAL replacement in the pipeline.
regds
MEL


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 15, posted (9 years 7 months 7 hours ago) and read 3238 times:

Quoting SuseJ772 (Reply 12):
How does CPDLC work?

CPDLC is "Controller-Pilot Data Link Communication". On the 744 it is done through the FMS. There are ATC centers in the world that have this capability. Simply put, you log on to the center, the actual data transmission is either by VHF or Sat Comm. You wait until the center accepts you and then you communicate the required position reports via CPDLC. Great system.

In the North Atlantic the system is even better. CPDLC is used as well ADS-B (automatic dependent surveillance-broadcast) Simply put, the aircraft broadcasts via VHF or Sat Comm the position based on GPS data. It is received and displayed on a computer screen. However the presentation is just like radar. So in the NAT system, once you log on to CPDLC, you don't even have to make position reports.

CPDLC works great enroute where the work load is much less than in the terminal area. However, I think it would be extremely impractical in the terminal area. Secondly, in the "old" days you could hear people on HF reporting their position so from that you could get a visual map of who was where in relation to you. Now you've lost that ability.

As I stated earlier, other parts of the world now have the capability. Singapore, Australia, Parts of India. It's really frustrating flying in some parts of the world and not having CPDLC. Especially, with the ATC charges the other countries are charging.


User currently offlineMir From , joined Dec 1969, posts, RR:
Reply 16, posted (9 years 7 months ago) and read 3212 times:

Quoting SuseJ772 (Reply 13):
It almost sounds like selcal is really "old fashioned" (pardon the statement if that is in some way offensive).

It may seem old-fashioned, and it probably is, but it works well for what it does, and I don't think that there's any need to change it. VORs are old technolgy too, but are still a primary means of navigation in many parts of the world. Just because it's old doesn't mean it isn't useful.

What I'm interested in knowing (and perhaps PhilSquares knows this) is whether ATC can call an aircraft using CPDLC, which would negate the need for SELCAL on that aircraft. I'm assuming CPDLC is not a voice method of communication but rather a text method, so ATC could just call an aircraft with CPDLC, and that aircraft would turn on their HF radio to have the required conversation.

-Mir


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 17, posted (9 years 6 months 4 weeks 1 day 23 hours ago) and read 3204 times:

Quoting Mir (Reply 16):
What I'm interested in knowing (and perhaps PhilSquares knows this) is whether ATC can call an aircraft using CPDLC, which would negate the need for SELCAL on that aircraft

Yes, the CPDLC units on each aircraft are all addressable. They each have their own unique address. However, you still need SELCAL for HF. SELCAL is not a function of CPDLC.

So, all the conversations are done in text and not done via HF.

Quoting Mir (Reply 16):
It may seem old-fashioned, and it probably is, but it works well for what it does, and I don't think that there's any need to change it.

HF is absolutely terrible! Try making a position report at night over the Indian Ocean. It's impossible, there is so much frequency saturation it's impossible. HF is still the same technology Amelia Earhart used!!! It's absolutely a crime that CPDLC, for enroute operations hasn't been mandated.


User currently offlineMir From , joined Dec 1969, posts, RR:
Reply 18, posted (9 years 6 months 4 weeks 1 day 22 hours ago) and read 3195 times:

Quoting PhilSquares (Reply 17):
Yes, the CPDLC units on each aircraft are all addressable. They each have their own unique address. However, you still need SELCAL for HF. SELCAL is not a function of CPDLC.

So what you're saying is that ATC can't text "call me" to a certain aircraft via CPDLC, and then that aircraft calls in on the HF radio?

Quoting PhilSquares (Reply 17):
HF is absolutely terrible! Try making a position report at night over the Indian Ocean. It's impossible, there is so much frequency saturation it's impossible. HF is still the same technology Amelia Earhart used!!! It's absolutely a crime that CPDLC, for enroute operations hasn't been mandated.

I was referring to SELCAL. I know HF is awful - I listen to live feeds from over the north atlantic occasionally, and the static is a pain in the ass. CPDLC is the way to go if possible, but there will always (at least for the forseeable future) be planes that are old and aren't CPDLC-equipped, and so HF is necessary. HF does suck, but as a method of getting planes to call in without having them have to listen to the HF constantly, I think SELCAL, old though it may be, works well enough.

-Mir


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 19, posted (9 years 6 months 4 weeks 1 day 22 hours ago) and read 3185 times:

Quoting Mir (Reply 18):
I was referring to SELCAL. I know HF is awful - I listen to live feeds from over the north atlantic occasionally, and the static is a pain in the ass. CPDLC is the way to go if possible, but there will always (at least for the forseeable future) be planes that are old and aren't CPDLC-equipped, and so HF is necessary. HF does suck, but as a method of getting planes to call in without having them have to listen to the HF constantly, I think SELCAL, old though it may be, works well enough.

I disagree. Let them apply the same criteria as MNPS. Then if they don't have the equipment then they have to fly out of the NAT or NOPAC. It's about time the rest of the world caught up.

Quoting Mir (Reply 18):
So what you're saying is that ATC can't text "call me" to a certain aircraft via CPDLC, and then that aircraft calls in on the HF radio?

Sure they could. But why would they. There is too much traffic on HF and in addition, CPDLC leaves nothing to interpretation.


User currently offlineRobK From , joined Dec 1969, posts, RR:
Reply 20, posted (9 years 6 months 4 weeks 1 day 17 hours ago) and read 3164 times:

You can invent whatever computerised gimmicks you want, but they won't kill off selcals.

If you're planning to remove your headsets when in an area out of VHF range you MUST get a selcal check and maintain a selcal watch. No selcal check = listening to the static! You can be ADS, CPDLC, HFDL, ACARS, blah blah whatever, but you still need to be contactable via voice! Computers are great when they're working..........

Selcals may have been around for the past 40 years but they do the job fine.

As a side note, I believe that level change clearances are always done by voice to avoid any confusion.

RK  Smile


User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 21, posted (9 years 6 months 4 weeks 1 day 16 hours ago) and read 3154 times:

Quoting RobK (Reply 20):
I believe that level change clearances are always done by voice to avoid any confusion.

No


User currently offlineDreamflight767 From , joined Dec 1969, posts, RR:
Reply 22, posted (9 years 6 months 4 weeks 1 day 10 hours ago) and read 3115 times:
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Thanks for all the info. guys. But I still don't understand why UAL is the ONLY airline I don't hear doing SELCAL checks and getting the HF frequencies. I hear every airline (SQ included) operating out of SFO/SJC/OAK about to cross the pacific getting this information from San Francisco Radio on 131.95 and 129.7 except for UAL. I have had a scanner for years and know the drill very well. All flights and all airlines operating to Asia, Hawaii, Australia, New Zealand, and sometimes ANC get their clearance except UAL. Why is this?

User currently offlineRobK From , joined Dec 1969, posts, RR:
Reply 23, posted (9 years 6 months 3 weeks 6 days 22 hours ago) and read 3031 times:

Selcal checks can be done on VHF (if in range) or HF. They WILL be getting a selcal check somewhere before entering oceanic airspace. It's compulsory.

RK


User currently offlineLaxintl From , joined Dec 1969, posts, RR:
Reply 24, posted (9 years 6 months 3 weeks 6 days 12 hours ago) and read 2963 times:

I am near 100% certain UA SFO ops frequency has SELCAL capability. I know they are able to do phone patches themselves also if required on the company frequency.

25 RobK : @ Laxintl, That'll be the ARINC LDOC frequencies. R
26 Laxintl : No, United has what the company terms "RDI" Remote Dialup Interface capabilities at several of its station here in the states making use of DTMF micr
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