Replacement of the HF Antenna Coupler is never required if due to low pressure. Checking the HF Antenna Coupler pressure is not a troubleshooting step in service. Neither required is the recharging the coupler pressure per AMM TASK 23-12-05-780-802. The HF Antenna Coupler is considered ¨on-condition¨ and only requires replacement if the troubleshooting clearly identifies the coupler has a fault.

To help access and identify faults, refer to the following Troubleshooting guide:

• SRT-2100 (B) system access and review procedure

If checks above are found satisfactory, continue with the following Troubleshooting guide:

• CES-5000 cabin SDU-2200 or SRT-2100B Guide

There is an operational condition affecting the Air Traffic Control (ATC) Data Link Departure Clearance Request (RCD) for Telelink equipped aircraft, where the Flight ID embedded in the RCD downlink message does not correlate with the aircraft identification entered in the Flight Plan. This may result in the following message "RCD REJECTED FLIGHT PLAN NOT HELD REVERT TO VOICE PROCEDURE”.

Please refer to the following AW for details and work around:

• AW700-23-0664 - Telelink - FLT ID Embedded in DEPART Clearance Downlink message