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#1
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Someone on the GNS480 yahoo group posted some text this morning from
Garmin Service Bulletin #621, to the effect that the GNS480 does not comply with the TSO, and that it reverts to TSO C129 type operations, for example requiring alternate airports to have ground-based approaches, having alternate means of navigation installed, RAIM prediction required. The text as posted says when flight-planning for a LNAV/VNAV or LPV approach, we should use RAIM prediction from Garmin Prediction Program 006-A0154-02, so it seems it's still possible to use the LNAV/VNAV and LPV approaches. The poster says the referenced prediction program is supposed to be available for download Nov. 1. I haven't received this Service Bulletin, I'm just going by what was posted in the yahoo group. Can anyone confirm they've also received this service bulletin, or have any more details? Thanks, Dave |
#2
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Dave Butler wrote:
Someone on the GNS480 yahoo group posted some text this morning from Garmin Service Bulletin #621, to the effect that the GNS480 does not comply with the TSO, and that it reverts to TSO C129 type operations, for example requiring alternate airports to have ground-based approaches, having alternate means of navigation installed, RAIM prediction required. Here's the followup after discussing with my avionics installer: During some testing, Garmin found a problem with GNS480 in a "high-noise environment". As a temporary measure, avionics installer will send us a new Approved Flight Manual Supplement (AFMS) which needs to be filed with the POH in the plane, and a logbook entry to the effect that the AFM has been updated. Some PC software for RAIM prediction will be available for download. Before launching, one should run the RAIM prediction software for the proposed route. [This leads me to speculate that the problem is in the RAIM prediction software in the GNS480.] Owners should receive the Service Bulletin by snail-mail from Garmin. |
#3
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My avionics guy said the AD requires discontinuing the use of the 480
for any IFR operation until the AFM update is received. -Robert |
#4
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"Robert M. Gary" wrote:
My avionics guy said the AD requires discontinuing the use of the 480 for any IFR operation until the AFM update is received. -Robert There's no AD. Just a service bulletin. The Garmin letter today said there will be a SAIB issued. |
#5
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Mike Adams wrote:
"Robert M. Gary" wrote: My avionics guy said the AD requires discontinuing the use of the 480 for any IFR operation until the AFM update is received. There's no AD. Just a service bulletin. The Garmin letter today said there will be a SAIB issued. Correct. My partners and I have decided not to get the AFMS change. We operate only Part 91. We've pinged the avionics installer to ask whether there's any reason that's a bad idea. No answer yet, but I expect not to update the AFMS. DGB |
#6
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![]() Dave Butler wrote: Correct. My partners and I have decided not to get the AFMS change. We operate only Part 91. We've pinged the avionics installer to ask whether there's any reason that's a bad idea. No answer yet, but I expect not to update the AFMS. If the unit doesn't comply with the TSO, it doesn't comply with the TSO. It doesn't matter whether you're Part 91 or not. You can't change reality by ignoring the SB that informs you of the lack of compliance on the basis of the part under which you operate. You have a navigator that is not C146a compliant, so you're installation is no longer approved for IFR unless you fall-back to C129a, which you do by changing your AFMS. You can choose to ignore the rule, and most likely nothing bad will happen, but don't pretend you'll be legal. |
#7
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Mike Granby wrote:
Dave Butler wrote: Correct. My partners and I have decided not to get the AFMS change. We operate only Part 91. We've pinged the avionics installer to ask whether there's any reason that's a bad idea. No answer yet, but I expect not to update the AFMS. If the unit doesn't comply with the TSO, it doesn't comply with the TSO. It doesn't matter whether you're Part 91 or not. You can't change reality by ignoring the SB that informs you of the lack of compliance on the basis of the part under which you operate. You have a navigator that is not C146a compliant, so you're installation is no longer approved for IFR unless you fall-back to C129a, which you do by changing your AFMS. You can choose to ignore the rule, and most likely nothing bad will happen, but don't pretend you'll be legal. The 480 is still certified under TSO C146, the subject line of this thread notwithstanding. |
#8
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![]() "Mike Granby" writes: If the unit doesn't comply with the TSO, it doesn't comply with the TSO. [...] One expects Garmin will promptly correct whatever 480 bugs have popped up. Otherwise they'll have some $serious reckoning to do for all the customers who purchased the unit because of that TSO. - FChE |
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