Garmin GI 275 Installation Manual page 121

When fabricating a new instrument panel, it must:
1. Use the same thickness, material type, and corrosion protection as the original instrument panel.
a. If existing instrument panel material isn't known, 2024-T3 aluminum per AMS-QQ-A-250/5,
6061-T6 aluminum per AMS 4025, AMS 4027, or AMS-QQ-A-250/11 must be used.
b. Corrosion protection must be in accordance with aircraft model-specific standard practices
manual, or alternatively chemical conversion coating per MIL-DTL-5541 Type II, or
MIL-DTL-81706 Type II, and high-solids chemical and solvent resistant epoxy primer per
MIL-PRF-23377, Class N.
2. Be manufactured using methods and procedures defined in an aircraft standard practices manual,
maintenance manual, or structural repair manual. Methods, techniques, and practices defined in
AC 43.13-1B Chapter 4, Section 4, Metal Repair Procedures, are acceptable.
3. Maintain the form of the existing instrument panel, including the location of fasteners, and retain
all elements of the instrument panel structure (if comprised of multiple parts assembled together),
such that every feature of the instrument panel is preserved or duplicated.
a. Multiple individual pieces of instrument panel assembly must not be combined.
b. Single pieces must not be split into smaller components.
4. Remain at the location where it was originally installed in the aircraft, use the same type of
fasteners as specified in the aircraft model-specific parts catalog, and retain the same instrument
panel installation method as defined by aircraft type design.
5. Retain the lighting for all previously installed instrument(s) that will be re-installed.
Installation and placement of the required placards and limitations must be in accordance with the
applicable aircraft data and aircraft type TCDS.
If any placards were relocated as a result of a display installation, verify the following:
• The font size of the new placard is the same as the placard it is replacing
• The color of the new placard is identical to the color of the placard it is replacing
• The text on the new placard is identical to the text on the placard that it is replacing (it can be
arranged differently as required by space constraints, but the wording must be the same)
• The new placard must be legible and not obscured to the pilot by the glareshield, in all flight
control positions, or by any other component in the flight deck
If new switch labels were added as a result of the GI 275 installation, verify the following:
• The font size and label is legible from the pilot's seat
• The labels are legible in all ambient light conditions. In particular, the labels are legible with
ambient flood lighting in darkness
• The switch label must be legible and not obscured to the pilot by the glareshield, in all flight
control positions, or by any other component to include the switch position
For VFR aircraft, the following is applicable when installing the GI 275:
• Standby instruments are not required
• Electrical bonding and wire routing must be considered for aircraft with non-metallic airframes
No additional placard is required if the aircraft is already limited to VFR operation prior to installation of
the GI 275; otherwise, the installation of the GI 275 must include the following on a placard:
• The text on the placard must read, "AIRCRAFT LIMITED TO VFR"
• The font size must be a minimum of 0.25 inches high (minimum 18 point font)
• The placard must be located in plain view near the pilot's PFD (pilot-side instrument panel)
Refer to Appendix D for aircraft models limited to VFR operations with the GI 275 system that previously
did not have this limitation.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 4-20