Appendix Acertification Documents; Airworthiness Approval; Continued Airworthiness - Garmin GMA 347 Installation Manual

APPENDIX A
A.1

Airworthiness Approval

Airworthiness approval of the GMA 347 may be acquired by the use of FAA Form 337. The following is
provided as sample wording for Form 337, when replacing an existing audio panel with a Garmin
GMA 347 Audio Panel. Modify appropriately for new installations.
Removed the existing [model] audio panel and replaced with a Garmin GMA 347 Audio Panel
and Marker Beacon, P/N 010-00275-xx in [aircraft location].
The GMA 347 is FAA TSO Approved to C50c and C35d Class A. The GMA 347 meets RTCA
DO-160D environmental qualifications for this installation. See Section 1 of the GMA 347
Installation Manual.
Installed in accordance with the Garmin GMA 347 Installation Manual 190-00325-01, Revision
[ ], and AC 43.13-2, Chapters 2, and 3.
The GMA 347 interfaces with existing aircraft radios per the Installation Manual instructions.
The Installation Manual provides detailed installation instructions and wiring diagrams (Sections
2, 3, and 4 and Appendices B and C).
Power is supplied to the GMA 347 through an existing [AUDIO 5] 5-Amp circuit breaker that
was previously used by the existing audio panel. The net electrical load is unchanged.
Aircraft equipment list, weights and balance amended. Compass compensation checked and
found to conform to applicable regulations.
A.2

Continued Airworthiness

Maintenance of the GMA 347 is "on condition" only. Refer to the GMA 347 Maintenance Manual
(Garmin P/N 190-00325-02). Periodic maintenance of the GMA 347 is not required.
The following sample Instructions for Continued Airworthiness (ICA) provides assistance in preparing
ICA for the Garmin GMA 347 unit installation as part of an FAA Type Certificate (TC) or Supplemental
Type Certificate (STC) project, to comply with 14 CFR §§23.1529 and 25.1529, "Instructions for
Continued Airworthiness".
Items that may vary by aircraft make and model are shown in braces ("[ ]") and should be filled in as
appropriate. Some of the checklist items do not apply, in which case they should be marked "N/A" (Not
Applicable).
GMA 347 Installation Manual
190-00325-01
CERTIFICATION DOCUMENTS
Page A-1
Revision A