- The Aircraft owner will need to contact Michigan Aviation
as soon as possible so we can submit your name, tail #, and
unit serial number to Garmin. Garmin will provide us with an RMA number that will be used to schedule and track the
factory upgrade.
- The legacy 400/500 unit will be removed from the
customer's aircraft and returned to Garmin for upgrade.
Garmin will replace/modify the GPS receiver and other
internal circuitry then return the unit to us with a new GPS
antenna.
- In general, the existing tray and wiring of the older non
WAAS 400/500 units are pin compatible with the new WAAS
units (no changes necessary to the basic wiring except for
some autopilots)
- The existing Garmin GPS antenna installed on the aircraft
will be removed and replaced with the new Garmin WAAS GPS
antenna supplied by Garmin.
- The existing antenna coax that runs from GNS400/500 tray
to the GPS may require replacement (see details below).
- A GPS source selection and GPS navigation annunciator may
need to be installed (see below)
- The autopilot or EFIS interface wiring may require
modification (see below)
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- A new FAA 337 form and POH supplement may be required to
reflect the upgrade and give operational guidance to the
pilot. The WAAS 400/500 units will have an AML (FAA approved
airframe list) from Garmin and most installations/upgrades
should not require an FAA field approval.
- Dual 500/400 series installations issues: If your aircraft
has an existing dual Garmin installation (IE 530/430,
430/430, etc..), the crossfill function will not work unless
both units have been upgraded to WAAS. A WAAS upgraded
400/500 will not crossfill to and older non-WAAS 400/500
series unit. See Garmin manual 190-00356-02 section 4.6.1.1.
- The existing warranty on a 400/500 series units that is
sent to Garmin for upgrade, will not be changed or extended
after the WAAS upgrade. That is to say, a GPS unit that is
out of warranty will not get a new factory warranty after
being upgraded to WAAS. Garmin will only warranty the work
that was done to upgrade the unit to WAAS.
- Garmin has announced a list price of $2999.00 for the unit
upgrade and new WAAS antenna. In addition to this factory
charge, there will be a labor change to modify the aircraft.
This labor charge will vary by aircraft depending on the
existing configuration (see below). Michigan Avionics
estimates the upgrade to run $3,500.00 (includes factory
upgrade cost and parts and labor) for non-pressurized
aircraft that do not require the GPS coax to be replaced and
do not require an external annunciator to be installed.
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