190-02207-A2
GPS 175/GNX 375/GNC 355 Part 23 AML STC Maintenance Manual
Rev. 3
Page 4-4
4.3 Maintenance Intervals
Table 4-1 below shows the systems and components installed by this STC that must undergo tests or
checks at specific intervals. The inspections based on calendar elapsed time have specifically stated
intervals.
Table 4-1 Periodic Maintenance
Item
Description/Procedure
Interval
Equipment Removal
and Replacement
Removal and reinstallation of the GPS 175/GNX 375/
GNC 355 LRUs.
On Condition
Cleaning
The GPS 175,GNX 375 and GNC 355 display and bezel
may be cleaned periodically.
The front bezel and display should be cleaned with a soft
cotton cloth dampened with clean water.
DO NOT
use any chemical cleaning agents. Avoid
scratching the surface of the display.
On Condition
Electrical Bonding Test An electrical bonding test must be performed on
equipment installed by this STC.
10 years or 2000
flight hours
Testing
The GPS 175/GNX 375/GNC 355 must be tested and
shown to comply with Title 14 CFR Part 91.277.
Replacement of
GPS Position
source(s).
Visual Inspection
A visual inspection of the equipment installed by this
STC must be performed.
12 Calendar
Months