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73
(Rev. 8/04)
®
Symptom
8. Cannot make air-to-ground
calls. Dropped calls.
Corrective Action
1. Verify “Air-Ground” appears on “Services” screen
(handset on-hook) when aircraft is at an alti-
tude of 18,000 feet or above.
2. If no error message appears on handset screen
while attempting to dial a party on the ground:
a) Physically inspect the antenna. The blade must
be firmly mounted with no cracks or dents
b) Ensure the tightness of all RF coax cable
connectors. The BNC and TNC connectors
connected to the front of the ARTU and the
type N connectors on the Duplexer and
Antenna should be “finger tight.” (Do not use
pliers of any kind to tighten these connectors.)
Using a 5/16” open-end wrench, ensure the
tightness of the two SMA connectors on the
Duplexer.
c) Ensure the integrity of all the RF coax connec-
tor ends.
3. Cycle power to the system using a 30 second
interval between breaker off to breaker on.
Remarks
* Air-Ground appears on “Services”
screen only when the C-2000 system
has a signal from a terrestrial ground
station.
NOTE: It is assumed that the antenna
placement is a minimum of 3 ft.
away from L-Band antennas.
* You should not be able to pull out or
twist the coax cable when the connec-
tor is fully seated and tightened.
* Allow five minutes for Built-In Test to
complete.
C. Corrective Action Guide, continued