Table 2 Maintenance Intervals For Antennas Installed Under This Stc - Garmin GTN 6 Series Instructions Manual

Table 2 Maintenance Intervals for Antennas Installed Under this STC

I
TEM
I
NTERVAL
1. E B
LECTRICAL ONDING
C , GPS A
HECK NTENNAS
(O
NLY IF ANTENNA IS
STC)
INSTALLED BY THIS
B C
OND HECK TO BE
P
ERFORMED IN
MD
ALIGNMENT WITH
369E/F/FF
MAINTENANCE SCHEDULE
E 10
VERY YEARS OR
20 100
EVERY TH HOUR
,
INSPECTION WHICHEVER
OCCURS FIRST
2. V I , GPS
ISUAL NSPECTION
A
NTENNAS
(O
NLY IF ANTENNA IS
STC)
INSTALLED BY THIS
T
O BE PERFORMED IN
MD
ALIGNMENT WITH
369E/F/FF
MAINTENANCE SCHEDULE
E 100
VERY FLIGHT
12
HOURS OR EVERY
,
MONTHS WHICHEVER
OCCURS FIRST
P
ERFORM VISUAL
INSPECTION IN EVENT OF
SUSPECTED LIGHTNING
STRIKE
190-01007-KB Rev. 3
Instructions for Continued Airworthiness GTN 6XX/7XX - MD369E/F/FF
D /P
ESCRIPTION ROCEDURE
An electrical bonding test must be performed on antennas interfaced to
equipment installed by this STC.
1. Gain access to the antenna installation.
2. Disconnect coaxial cable(s) from the antenna connector(s)
3. Measure the resistance between the antenna connector and a nearby
exposed portion of conductive aircraft structure (example: exposed
rivet)
4. Verify the resistance is equal to or less than 10 milliohms.
.
5. Reconnect the coaxial cable(s) to the antenna connector(s) and ensure
it is secured. In the event of bonding test failure, remove antenna, and
clean and prepare the mating surfaces and hardware as follows:
(a) For antennas that are secured with nuts and bolts, clean the
fastener hole in the antenna and the underside of the fastener head
itself. Prep the area underneath the washer on the inner mould line
of the skin in accordance with CSP-HMI-3 96-00-00 Maintenance
Practice Section 6. If nutplates are used in lieu of a nut, the
technician is only required to clean the underneath of the fastener
head and the fastener hole.
(b) For antennas that use stud mounts, prep the area underneath the
washer on the inner mould line of the skin in accordance with CSP-
HMI-3 96-00-00 Maintenance Practice Section 6
6. Re-install using unit replacement procedures in the GTN 6XX/7XX PART
27 AML STC MAINTENANCE MANUAL Section 5. Any reworked antenna
installation shall have a resistance of less than or equal to 2.5 milliohms.
Visual inspection on the antenna
1. Clean the antenna with water and mild soap.
2. Verify there are no cracks on the antenna and around attachment
fasteners.
3. Verify that all sealing fillets around the antenna are in good condition.
4. If the antenna is broken, cracked, or dented it must be replaced.
5. In the event attachment is not secure, re-attach antenna and complete
.
the Electrical Bonding Test.
6. In the event the antenna seal shows signs of damage, re-seal the
antenna and gasket by running a bead of the MIL-A-46146 Non-
Corrosive RTV Silicone Adhesive-Sealant along the edge of the antenna
where it meets the exterior aircraft skin. MIL-S-8802 Sealing Compound,
Temperature-Resistant, High Adhesion can be used as an alternative.
Use caution to insure that the antenna connectors are not contaminated
with sealant.
7. Visually inspect the rotorcraft exterior skin around installed antenna -
(a) Clean the exterior of the aircraft skin within a 10 inch radius of the
antenna with water and mild soap.
(b) Inspect aircraft skin around the antenna footprint to verify there are
no cracks and aircraft skin is not deformed.
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