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ATC Mic Problems At SEA  
User currently offlineN766AS From , joined Dec 1969, posts, RR:
Posted (13 years 6 months 5 days ago) and read 1334 times:

A couple days ago I was listening to Seattle Tower and noticed the control tell an aircraft to "contact ground on 126.25" much to the pilots (and my) confusion, prompting a confirmation. Well, turns out a mic got stuck on 121.7 (however that happened) and so Ground was hopping frequencies for a while.
My question: does this happen often? It would seem that if this had happened on a more sensitive channel, such as tower, that there could have been lots of confusion for a few moments.
Just wondering... thanks.

13 replies: All unread, jump to last
 
User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 1, posted (13 years 6 months 4 days 23 hours ago) and read 1273 times:

Not quite sure what you are trying to explain! Or ask! Who's mic was stuck the controllers?? Or the Pilots? Was the mic stuck? Or was he on the wrong frequency? I do not see what is so strange about Tower telling some one to contact ground?
What might have happend if one controller was doing both ground and tower, therefore a bit of confusion. There is also a guy in the tower who's responsibility is too keep an eye out and he is able to speak on any frequency.
Iain


User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 2, posted (13 years 6 months 4 days 22 hours ago) and read 1256 times:

Stuck mikes occur every once in awhile, and it's usually one of the aircraft mikes (or push-to-talk switches) that stays depressed. Depending upon what frequency the open mike is on, it can indeed get quite busy as alternatives are worked out.

Airline aircraft typically have 2 separate VHF radios (sometimes 3), so there are other ways to reach aircraft to have them (all) check their mikes. We sometimes get calls in the dispatch office from ATC, asking us to contact the crew (via radio, ACARs, SELCAL, or the local station folks (if still on the gate)) to have them check who's the lucky flight with the stuck mike.





User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 3, posted (13 years 6 months 4 days 20 hours ago) and read 1235 times:

OPNLguy summed this one up. Some of the newer aircraft A320 can detect this and present a message to the crew the radio that a mike is stuck.

The message is
COM VHF(or HF) EMITTING
obviously the crew would then remedy the situation.


User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 4, posted (13 years 6 months 4 days 19 hours ago) and read 1231 times:

JG One of the 172's I used to fly used to have a light on the COM which lit up when you keyed the mic, althought it does not say 'COM VHF(or HF) EMITTING' it still indicates us that we have a stuck mic.
Iain


User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 5, posted (13 years 6 months 4 days 18 hours ago) and read 1223 times:

Iainhol
I am pleased to here that one does not need to spend 45 million to get that feature.

The Airbus as equipped where I work does not have any indication that a com is transmitting... just that message if transmitting too long.

Cheers


User currently offlineN766AS From , joined Dec 1969, posts, RR:
Reply 6, posted (13 years 6 months 3 days 21 hours ago) and read 1199 times:

Sorry for the confusion, Iain. Just about every ground frequency in the USA is 121.XXX (or similar), so the pilot and me were naturally suprised when he was told to contact ground on 126.25. The tower controller was explaining that "We have a stuck mic on point seven." So, from what I gathered, due to the signal from the tower no one could transmit on 121.7. So for at least two or three hours (as long as I was listening in) they had ground on 126.25 instead of 121.7 (which I thought strange because if it was as simple as a stuck mic, why wouldn't it be fixed? Open carrier signal was all I got on 21.7).
Anyway, I wouldn't have even posted a question if this hadn't gone on for 2+ hours. You'd think a stuck mic could be resolved in two seconds, not two hours...


User currently offlineIainhol From , joined Dec 1969, posts, RR:
Reply 7, posted (13 years 6 months 3 days 21 hours ago) and read 1198 times:

I see now, that happend at SNA once with my boss, however he was the one with a stuck mic. I am not sure if you can transmit when there is a stuck mic, however I remember a story of some one listening to a kid, talking to his mother about his sisters new boyfriend, with a stuck mic. However I do not know how true it is. There could have been a plane in a gate with a stuck mic, or maybe a GA aircraft was using his icomm which was left on ect.
Iain


User currently offlineOPNLguy From , joined Dec 1969, posts, RR:
Reply 8, posted (13 years 6 months 3 days 21 hours ago) and read 1199 times:

>>>You'd think a stuck mic could be resolved in two seconds, not two hours...

Oh, it *can* be resolved in 2 seconds, assuming someone absolutely knows *which* of the aircraft on the airport at the time is the culprit. A crew might not readily notice that the push-to-talk switch didn't snap back out. Not every aircraft on the airport is occupied by the crew.

Since this one last so long, and affected ground control, it sounds like an arriving aircraft came in to the gate (ground would have been the last ATC folks the crew spoke with), and then the aircraft sat for awhile (for maintenance, dead time before its next scheduled flight) without anyone aboard to notice.


User currently offlineFalcon Flyer From United States of America, joined Jul 2000, 1323 posts, RR: 0
Reply 9, posted (13 years 6 months 3 days 20 hours ago) and read 1196 times:

Most, if not all ATC facilities have back up frequencies at their disposal for just such occurences. It's relatively common.


My definition of cool ? Not trying so hard to be cool.
User currently offlineJG From United States of America, joined Jun 2005, 0 posts, RR: 1
Reply 10, posted (13 years 6 months 3 days 19 hours ago) and read 1190 times:

Hey, arn't we quick to blame the pilots... Smile it happens to those ATC guys too. Some transmitter goes on the fritz and who knows.

Everytime they try some new modernization computer load center radar goes out why not a radio for a while.

Sounds like a simple fix sometimes but those ATC guys are not just sitting there next to some King package able to turn it off. Just like us, they sit there for a while thinking 'it sure is quite out there.' Eventually someone realizes a problem then has to follow a chain of command to one day call plant maintenance.


User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4193 posts, RR: 37
Reply 11, posted (13 years 6 months 3 days 14 hours ago) and read 1180 times:

I was flying one from Tallahassee to Atlanta and this guy's mic switch got stuck...after he responded to the controller he continued his account of screwing this chick. Man.... and my mom was riding with me on that trip with her headphones on too (this was in a Cessna 150A i was using to build time this summer).... Stuck mics are a pretty common occurence. Finally the controller was able to break through somehow and changed me to another frequency.


Chicks dig winglets.
User currently offlineSkyWestPilot From , joined Dec 1969, posts, RR:
Reply 12, posted (13 years 5 months 4 weeks 1 day 21 hours ago) and read 1161 times:

Hey, N77AS, I was in Seattle when that happened (but it wasn't my mic!!). 126.25 in SEA is usually reserved for Gate Hold. In fact because of all the fog this morning, they were using gate hold. When gate hold procedures are in effect we call them for pushback or engine start before talking to ground.

I'll back up the fact that it's not always the pilot. Could have been a tug with a radio, or an Airport Operations vehicle that was parked with the radio mic stuck on. I've even heard voices in the background of stuck mics. Could prove to be embarrasing. I've heard an instructor talk a student through a whole takeoff, traffic pattern and landing with his mic stuck. I can be comical at times!


User currently offlineN766AS From , joined Dec 1969, posts, RR:
Reply 13, posted (13 years 5 months 4 weeks 1 day 12 hours ago) and read 1152 times:

Oh, I wasn't aware about Gate Hold on 126.25 (another freq to program into the radio!).
Yeah- the fog was nasty this morning... if I heard correctly, it was causing delays. It's good listening when that NWA DC-10 is lined up for 16R and keeps asking for RVR, and he barely makes it (needs 1800, gets 2100).  Big grin Maybe I'm just a pessimist.

Hmm.. just heard a little while ago that Ryan750 had to turn back to SEA because of 'pressurization problems'. That'll cause havoc on the meter delays for a little bit.


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