Garmin GNC 420AW, Installation Manual

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400W Series Installation Manual Page 7-1
190-00356-02 Rev. G
7. LIMITATIONS
7.1 Operations
There are no Part 23 aircraft type limitations. All functions of the 400W Series unit meet the appropriate
design assurance qualifications for primary or secondary for airplane Class I, Class II, Class III, and Class
IV in accordance with AC 23.1309-1C Figure 2. The TSO authorizations with the RTCA/DO178B
software levels by function are listed in Table 1-4.
7.1.1 TSO-C146a GPS/WAAS Limitations
Due to the equipment’s TSO qualified performance in tracking low-elevation-angle satellites, operational
limitations may be required based upon the GPS antenna or GPS software used in the installation. If
AML STC SA01933LA is used as the basis for approval, the appropriate limitations are included in the
AFMS provided with the STC. However, if other airworthiness approval is obtained, the following
limitations must be included in the Aircraft Flight Manual or Aircraft Flight Manual Supplement if an
antenna listed in Table 1-3
or GPS software version 2.X is used:
NOTE
The limitations below do not apply to VFR-only installations and as such do not need
to be included in the AFM/AFMS.
The equipment does not comply with US 14 CFR part 91, SFAR 97 requirements for TSO-C146a
equipment. Until complete compliance is demonstrated and approved by the FAA, authorization
to conduct any GPS or WAAS operation under Instrument Flight Rules (IFR) requires that:
1) Aircraft using the GPS or WAAS capability of the 400W Series navigation equipment under
IFR must be equipped with an approved and operational alternate means of navigation
appropriate to the flight, with the exception of oceanic and remote operations.
2) For flight planning purposes, if an alternate airport is required, it must have an approved
instrument approach procedure other than GPS or RNAV that is anticipated to be operational
and available at the estimated time of arrival. All equipment required for this procedure must
be installed and operational.
3) For flight planning purposes, Garmin Prediction Program part number 006-A0154-03 (with
the
<insert installed antenna model number/part number>
antenna selected) should be
used to confirm the availability of RAIM for the intended flight in accordance with the local
aviation authority guidelines for TSO-C129a equipment. WAAS NOTAMs (or their absence)
and generic prediction tools do not provide an acceptable indication of the availability for the
400W Series equipment.
4) When flight planning an LNAV/VNAV or LPV approach, operators should use the Garmin
Prediction Program part number 006-A0154-03 (with the
<insert installed antenna model
number/part number> antenna selected) in addition to any NOTAMs issued for the
approach.
NOTE
Garmin Prediction Program part number 006-A0154-03 is contained on the 400W/500W
Trainer CD, P/N 010-10601-00.