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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 4-3
4.4 Visual Inspection
Conduct a visual check of the GTN unit, switches, GMA 35 (if installed), and their wiring harnesses to
ensure continued installation integrity.
1.
Inspect the GTN unit(s), GMA 35, and Flight Stream 210 for security of attachment, incl
uding
visual inspection of mounting racks and other supporting structure attaching the racks to aircraft
instrument panel.
CAUTION
Care should be taken when tightening the mounting screws of the Flight Stream 210.
Excessive tightening may damage the mounting flange.
2. Inspect for signs of corrosion.
3. Inspect all switches, knobs, and buttons for damage.
4. Inspect condition of wiring, shield terminations, routing, and attachment/clamping.
5. Check the fan intake slots on the sides and bottom of the GTN unit’s bezel for dust, dirt, or
obstructions. Clean as needed.
6. Conduct a visual check of the GPS/SBAS antenna cable overbraid if installed.
7. Conduct a visual check of the WXR cable overbraid if installed.
8. Conduct a visual check of any bonding strap or conductive tape used for electrical bonding or RF
ground plane (if installed). Replace any damaged or torn strap. See Section 6.12 or Section 6.13
for details. Replace any torn bonding tape using a heavy duty aluminum foil tape such as
3M P/N 438 or other foil with aluminum that is 7.2 mils thick or greater. If strap termination
hardware is loose, tighten and retest bonding, see Section 4.5 for details.
Test Lightning
Protection
The GTN #1 main power input and NAV power input will have a
TVS located at the LRU, for IFR non-metallic aircraft only. The
TVS must be replaced in accordance with Section 4.6.1.
Conduct a visual check of the GPS/SBAS antenna cable
overbraid in accordance with Section 4.7
Conduct a visual check of the WXR cable overbraid in
accordance with Section 4.8 if installed.
After a
suspected or
actual
lightning
strike
Visual Inspection
The GTN unit, GMA 35 (if installed), Flight Stream 210
(if installed), switches, and wiring harnesses should be inspected
to ensure continued integrity of the installation. These items must
be inspected in accordance with Section 4.4.
12 Calendar
Months
Item Description/Procedure Interval
GTN 6XX/7XX - Verify the countersunk fastener heads are in full contact with the unit
mounting rack holes. Re-torque the mounting screws 12-15 in-lbs if required.
GMT 35 - If the GMA 35 is installed, verify the countersunk fastener heads are in full contact
with the unit mounting rack holes. Re-torque the GMA 35 mounting screws to 8.5-9.5 in-lbs if
required.
Flight Stream 210 - If the Flight Stream 210 is installed and screws are not securely attached,
tighten any loose Flight Stream 210 mounting screws as necessary to snug plus one-quarter
turn. If required, re-torque bonding strap hardware to 12-15 in-lbs.