![]() |
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
![]()
I went up for currency with my (former) CFII. We were flying back to
San Carlos (KSQL) and on the GPS 30 approach. We were cleared to depart OSI at a heading of 140. Norcal informed that they are going to fly us 7 miles past AMEBY. They flew us about 3 miles east south east of AMEBY when they had us do a left turn direct AMEBY. I was perfectly established and 2 miles out from the FAF the Garmin 430 went into approach mode. I had the needles perfectly centered about 1 mile from CUZUP (FAF) when I was kicked out of approach mode. We stayed at that altitude as we are very familiar with the approach and terrain and we skimmed one very thin cloud for about 5 seconds and then went fully visual. During that time my CFII did a RAIM check. I thought it passed but maybe I'm wrong. On the ground, he was unsure why we were kicked out of approach mode. He thought it might be because we were more than 25 (?) degrees off of the AMEBY-CUZUP course but then again it definitely went into approach mode before that. We were kicked out while theh needles were dead centered. Any ideas? Gerald |
#2
|
|||
|
|||
![]()
maybe
http://gps.faa.gov/Library/Data/SatN...-2005-text.htm "G. Sylvester" wrote in message ... |I went up for currency with my (former) CFII. We were flying back to | San Carlos (KSQL) and on the GPS 30 approach. We were cleared to depart | OSI at a heading of 140. Norcal informed that they are going to fly us | 7 miles past AMEBY. They flew us about 3 miles east south east of AMEBY | when they had us do a left turn direct AMEBY. I was perfectly | established and 2 miles out from the FAF the Garmin 430 went into | approach mode. I had the needles perfectly centered about 1 mile from | CUZUP (FAF) when I was kicked out of approach mode. We stayed at that | altitude as we are very familiar with the approach and terrain and we | skimmed one very thin cloud for about 5 seconds and then went fully | visual. During that time my CFII did a RAIM check. I thought it passed | but maybe I'm wrong. On the ground, he was unsure why we were kicked | out of approach mode. He thought it might be because we were more than | 25 (?) degrees off of the AMEBY-CUZUP course but then again it | definitely went into approach mode before that. We were kicked out | while theh needles were dead centered. | | Any ideas? | | Gerald |
#3
|
|||
|
|||
![]()
This happened to me about a year ago on that approach (I'm based at
SQL) and sounds like almost the same point. It all came back after about 15 seconds, the RAIM flag went away. I don't recall whether I was still in approach mode or not, but like you I broke out about the time I was figuring out my next move. I've wondered whether there's some kind of signal interference from the Stanford/SLAC vicinity once in a while. (This is pure speculation, I have no data to support that.) Something also messes up 119.0 (tower freq) in that area all the time. -Jon C. "G. Sylvester" wrote in message ... I went up for currency with my (former) CFII. We were flying back to San Carlos (KSQL) and on the GPS 30 approach. We were cleared to depart OSI at a heading of 140. Norcal informed that they are going to fly us 7 miles past AMEBY. They flew us about 3 miles east south east of AMEBY when they had us do a left turn direct AMEBY. I was perfectly established and 2 miles out from the FAF the Garmin 430 went into approach mode. I had the needles perfectly centered about 1 mile from CUZUP (FAF) when I was kicked out of approach mode. We stayed at that altitude as we are very familiar with the approach and terrain and we skimmed one very thin cloud for about 5 seconds and then went fully visual. During that time my CFII did a RAIM check. I thought it passed but maybe I'm wrong. On the ground, he was unsure why we were kicked out of approach mode. He thought it might be because we were more than 25 (?) degrees off of the AMEBY-CUZUP course but then again it definitely went into approach mode before that. We were kicked out while theh needles were dead centered. Any ideas? Gerald |
#4
|
|||
|
|||
![]()
Jon Carlson wrote:
This happened to me about a year ago on that approach (I'm based at SQL) and sounds like almost the same point. It all came back after about 15 seconds, the RAIM flag went away. I don't recall whether I was still in approach mode or not, but like you I broke out about the time I was figuring out my next move. I've wondered whether there's some kind of signal interference from the Stanford/SLAC vicinity once in a while. (This is pure speculation, I have no data to support that.) Something also messes up 119.0 (tower freq) in that area all the time. -Jon C. thanks for the feedback. I know a Controller at OAK Center. He might be able to direct me to someone at Norcal. If not, maybe just a NASA Report. Maybe there were others as well. thanks. Gerald |
#5
|
|||
|
|||
![]()
In article ,
"Jon Carlson" wrote: I've wondered whether there's some kind of signal interference from the Stanford/SLAC vicinity once in a while. (This is pure speculation, I have no data to support that.) Something also messes up 119.0 (tower freq) in that area all the time. What is on the ground in that area? |
#6
|
|||
|
|||
![]()
john smith wrote:
What is on the ground in that area? not much at all. A cement plant. About 7 miles away is an AM radio tower. Gerald |
#7
|
|||
|
|||
![]()
In article ,
"G. Sylvester" wrote: john smith wrote: What is on the ground in that area? not much at all. A cement plant. About 7 miles away is an AM radio tower. And whatever microwave transmitters are leasing space. :-)) |
Thread Tools | |
Display Modes | |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
G430 Display/Numbers or Pictures? | Mitty | Instrument Flight Rules | 32 | September 9th 06 01:04 AM |
Departure/Enroute RAIM | [email protected] | Instrument Flight Rules | 13 | September 4th 05 12:04 AM |
RAIM errors and the Apollo GPS | Lee Elson | Instrument Flight Rules | 4 | July 13th 04 03:12 PM |
RAIM? | Roy Smith | Instrument Flight Rules | 25 | June 10th 04 03:40 PM |
RAIM Prediction | Barry | Instrument Flight Rules | 9 | October 4th 03 03:39 AM |