190-01007-C1
GTN Xi Part 23 AML STC Maintenance Manual
Rev. 1
Page 4-5
4.4 Visual Inspection
CAUTION
Take care when tightening the mounting screws of the Flight Stream 210. Excessive tightening
may damage the mounting flange.
Conduct a visual check of the GTN Xi, switches, GMA 35 (if installed), Flight Stream 210 (if installed),
Flight Stream 510 (if installed), and their wiring harnesses to ensure they continue to comply with STC
SA02019SE-D.
1. Inspect the GTN Xi, GMA 35, and Flight Stream 210 for security of attachment, including visual
inspection of mounting racks and other supporting structure attaching the racks to aircraft
instrument panel.
GTN Xi -
Verify the countersunk fastener heads are in full contact with the unit mounting rack
holes. Re-torque the mounting screws 12 to 15 in-lbf, if required
GMA 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 8.5 to 9.5 in-lbf, if
required. For installations that use a hook and loop fastener to secure the GMA 35c Bluetooth
antenna mount, ensure the hook and loop bond is firm. If the hook and loop fastener is worn,
replace it
Flight Stream 210
-
If the Flight Stream 210 is installed, and screws are not securely attached,
tighten any loose mounting screws to snug plus one-quarter turn. If required, re-torque
bonding strap hardware to 12 to 15 in-lbf
Flight Stream 510
- Ensure the data card is properly oriented (label facing right), fully
inserted, and locked into position in the card slot on the front-left side of the GTN Xi.
2. Inspect for corrosion.
3. Inspect 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 Xi unit’s bezel for dust, dirt, or
obstructions. Clean as needed.
6. Conduct a visual check of any bonding strap or conductive tape used for electrical bonding or RF
ground plane (if installed).
7. Replace any damaged or torn strap. Refer to Section 6.10 or Section 6.11 for details.
8. Replace any torn bonding tape using a heavy duty aluminum foil tape, such as 3M P/N 436 or 438
or another foil with aluminum that is 7.2 mils thick or greater. If strap termination hardware is
loose, tighten and re-test bonding. Refer to Section 4.5 for details.
