Garmin 430 WAAS upgrade- what is actually done to the unit?

Discussion in 'Avionics and Upgrades' started by imwithtuxedo, Aug 12, 2019.

  1. imwithtuxedo

    imwithtuxedo Pre-Flight

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    Had a 430 upgraded to WAAS last fall and now the unit is bench testing with 3 degrees of error in the OBS and its transmitting frequency is over 700 Hertz, (632 Hertz maximum)

    According to Garmin a WAAS upgrade includes the following:

    Brings WAAS-level GPS Capability to Older GNS™ 430/530
    • Upgrades GPS engine, microprocessor and software to meet higher WAAS-level requirements
    • WAAS receiver now updates 5 times per second versus original 1-per-second rate
    • Increased positional accuracy supports ILS-like LPV glidepath GPS approaches
    • Enables more flexible departure/arrival procedures and more “direct to” routes
    • Meets NextGen WAAS requirements for ADS-B “Out” positioning reference
    Did my 430 unit have these problems prior to the WAAS upgrade and does Garmin do any testing of the units before sending them back out?
     
  2. Ryan Klems

    Ryan Klems Pre-Flight

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    While I believe they do test them pretty thoroughly, we did get a 530 back from the W upgrade and it had a super flakey com-flip switch. Had very poor feel and was very intermittent on the actual performance. Sent it back to Garmin and then said it was fine, but that they changed it out for "customer satisfaction". Not really sure how it was fine when only one out of 5 presses would seem to trigger the flip. But never had a problem in multiple other units sent in for upgrade, they always come back looking brand new. For the OBS error, have you tried re-calibrating the OBS resolver to the unit from the configuration mode? If it's out of spec on transmit frequency, probably has to go back for a flat rate repair unfortunately. I'm sure that wouldn't have left from the upgrade without that being in spec.
     
  3. NordicDave

    NordicDave Line Up and Wait

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    I did mine. It comes back from Garmin like new in the box with a 1 year warranty.

    The WAAS upgrade includes terrain & obstacle avoidance with fully refreshed data. If the data is stale after installation, call Garmin and they usually give a no-charge date using their data sets.

    Here's the panel after: http://welch.com/n46pg/wp-content/uploads/2019/01/IMG_6796-1024x768.jpg