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#1
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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
"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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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
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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GNS480 not TSO C146a?
Dave Butler wrote: The 480 is still certified under TSO C146, the subject line of this thread notwithstanding. But it doesn't meet the requirements of the TSO, but Garmin have been granted a temporary deviation which requires the modification to the AFMS. So the argument still applies. If you don't make the mod, you have a non-TSOed GPS and a non-approved installation. |
#9
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GNS480 not TSO C146a?
Mike Granby wrote:
Dave Butler wrote: The 480 is still certified under TSO C146, the subject line of this thread notwithstanding. But it doesn't meet the requirements of the TSO, but Garmin have been granted a temporary deviation which requires the modification to the AFMS. So the argument still applies. If you don't make the mod, you have a non-TSOed GPS and a non-approved installation. I disagree, but am listening. Do you think a manufacturer can decertify a TSO'd piece of equipment by just issuing a SB? I don't think so. |
#10
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GNS480 not TSO C146a?
Dave Butler wrote:
Do you think a manufacturer can decertify a TSO'd piece of equipment by just issuing a SB? I don't think so. I'm with you, Dave. Unless I receive an AD that declares my installation no longer airworthy, a service bulletin alone does not "decertify" the equipment. Mike |
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