Maintenance Intervals; Table 3-1 Periodic Maintenance - Garmin GI 275 Maintenance Manual

3.3 Maintenance Intervals

Item
GI 275 System
Visual Inspection
Backup Battery
Check
AHRS Magnetic
Field Model Update
Electrical Bonding
Check
Altimeter Checks
Lightning Damage
Check
Equipment Removal
and Replacement
Cleaning GI 275
Touchscreen
Display Backlight
Pitot-Static Drains
190-02246-C2
Rev. 3

Table 3-1 Periodic Maintenance

Description / Procedure
All installed displays, operation of display controls (knobs),
sensors, and wiring harnesses must be inspected to
ensure continued integrity of the installation. The
inspection must be performed in accordance with
Section 3.4.
If installed, perform a Backup Battery Check as described
in Section 5.7.3.
If the backup battery does not pass the Backup Battery
Check, it is required to replace the battery using the
procedure found in Section 5.2.
The GI 275 Integrated ADAHRS utilizes an Earth magnetic
field model that is updated once every 5 years as part of
the Aviation Database maintained by the owner/operator.
If the magnetic model is not up-to-date, the unit will issue
an alert upon start-up indicating the model has expired. A
Service Bulletin containing the updated magnetic field
model and instructions for installation can be obtained
from the Dealer Resource Center
Perform an electrical bonding check of the GI 275 system
LRUs in accordance with Section 3.5.
Test according to 14 CFR §43 Appendix E.
Refer to the pitot-static checkout procedure in Section
5.9.2 for system-specific checkout procedure.
Conduct an inspection of the GI 275 system in accordance
with Section 3.7.
Removal and replacement of the GI 275 system LRUs can
be accomplished by referring to Section 5 for instructions.
The display can be cleaned with a soft cotton cloth
dampened with clean water. DO NOT use any chemical
cleaning agents. Care should be taken to avoid scratching
the surface of the display.
Over time, the backlight lamp may dim and the display
may not perform as well in direct sunlight conditions. The
user must determine by observation when the display
brightness is not suitable for its intended use. Contact a
Garmin authorized repair station when the backlight lamp
requires service.
Drain(s) in pitot and static lines added to GI 275
connection with the existing rotorcraft pitot-static system
must be opened and discharged, if present. Drains are
added only if added pneumatic lines cannot be routed to
continuously slope down from the GI 275 unit to
connection with existing pitot-static system.
or by contacting Garmin.
GI 275 Part 27 AML STC Maintenance Manual
Interval
12 calendar months
12 calendar months
Every 5 years
Every 2000 flight
hours or 10 years,
whichever comes
first
Interval must be in
accordance with
Title 14 CFR
§91.411 and 91.413
After a suspected or
actual lightning strike
On Condition
On Condition
On Condition
12 calendar months
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