Garmin GNC 420AW Installation Manual - page 28
Page 1-16
400W Series Installation Manual
Rev. F
190-00356-02
1.6.4
79B
ETSO Deviations
The GNS 400W Series meets the requirements of the listed ETSOs with the following deviations.
ETSO Deviation
ETSO-2C34f
Garmin was granted a deviation from ETSO-2C34f to use RTCA/DO-160C instead of RTCA/DO-160D.
ETSO-2C36f
Garmin was granted a deviation from ETSO-2C36f to use RTCA/DO-160C instead of RTCA/DO-160D.
ETSO-2C37e
Garmin was granted a deviation from ETSO-2C37e to use RTCA/DO-160C instead of RTCA/DO-160D.
ETSO-2C38e
Garmin was granted a deviation from ETSO-2C38e to use RTCA/DO-160C instead of RTCA/DO-160D.
ETSO-2C40c
Garmin was granted a deviation from ETSO-2C40c to use RTCA/DO-160C instead of RTCA/DO-160D.
ETSO-C113
Garmin was granted a deviation from ETSO-C113 to use RTCA/DO-160C instead of RTCA/DO-160D.
1. Garmin was granted a deviation from ETSO-C146 to use RTCA/DO-160C instead of RTCA/DO-160D.
2. Garmin was granted a deviation from ETSO-C146 to use RTCA/DO-229C instead of RTCA/DO-229B for
minimum operating specifications.
3. Garmin was granted a deviation from RTCA/DO-229C for the requirement to use as a specific “NAV”
labeled key. RTCA/DO-229C Table 2-5 lists the function “Access to primary navigation display (Section
2.2.1.4.1)” with a label “NAV”.
4. Garmin was granted a deviation from RTCA/DO-229C not to implement paragraph 2.2.3.2.2 which
states “The equipment shall allow the pilot to initiate the missed approach with manual action. It shall be
possible to take this action before crossing the MAWP (Missed Approach Waypoint), in which case the
equipment shall automatically initiate the missed approach procedure at the MAWP.”
5. Garmin was granted a deviation from RTCA/DO-229C not to implement paragraph 2.2.4.2.3 which
states “If the aircraft is past the FPAP – (length offset), and the pilot has not already activated the missed
approach, the receiver shall automatically transition to missed approach guidance.”
6. Garmin was granted a deviation from RTCA/DO-229C paragraphs 2.2.4.6.4 and 2.2.5.6.4 not to use the
low altitude alerting function when the GNS 400W Series unit has TERRAIN enabled and is not in one of
the following states: FAIL, N/A, TEST, or INHIBIT. When TERRAIN is not enabled, or when it is enabled
but the current state is FAIL, N/A, TEST, or INHIBIT, the low altitude alert described in DO-229C 2.2.4.6.4
and 2.2.5.6.4 is used.
7. Garmin was granted a deviation from RTCA/DO-229C not to implement paragraph 2.2.1.4.9.c which
states “BRG to or from a VOR: The bearing is based on the true-to-magnetic conversion at the waypoint
location, using the same magnetic conversion as used to define the path.” Instead, the “user” (current)
location will be used.
ETSO-C146
8. Garmin was granted a deviation from RTCA/DO-229C paragraph 2.1.1.9 to allow the unit up to 20
seconds (instead of 10 seconds) to reacquire a dropped satellite under the conditions described in the
paragraph.
1.6.5
80B
FCC Grant of Equipment Authorization
Model FCC
ID
GNC 420W, GNS 430W
IPH-0021400 (VHF COM Transceiver)
GNC 420AW, GNS 430AW
IPH-0061100 (VHF)