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16.5  [ICAO Annex 10 Aeronautical Telecommunications Volume I Paragraph 2.9 Secondary power supply for radio navigation aids and communication systems.]
16.6  Guidance: The incorporation of suitable conditioning devices as part of the mains / backup power supply arrangements may be useful in preventing equipment malfunction due to surges, spikes and noise on the power supply.
17  Alarm / Status Indications
17.1  For an Air Traffic Control Service, the system shall provide an indication of system failure that may have an effect on the service being provided, in a timely manner, so that actions can be taken to ensure the safe continued provision of an ATC Service or if necessary the controlled withdrawal of the service (284).
17.2  Recommendation: The Significance to the user of the indication of failure should be obvious from the indication given (285).
17.3  The failure indication should remain obvious to the user whilst the condition causing the failure indication remains (286). Consideration should be given to providing a power supply to the alarm indication that is not dependent upon the system it is monitoring (287).
17.4  Changes in the System’s state should attract the operator’s attention, without continuing to distract once they are aware of the change of state (288). Attention should be drawn both when failures are detected and when they clear (289). Attention to subsequent status changes should not be masked (290). The attention seeking indication should have both visual and audible elements and the ability for the user to acknowledge that they are aware of the change of state thereby removing the attention seeking element (291).
CAP 670  Air Traffic Services Safety Requirements 
18  Interface to Voice / Data Recording Equipment 
18.1  The equipment and systems at the Base Station shall provide all the necessary signals and information to the Voice / Data Recording Equipment in compliance with Article 206 of the Air Navigation Order (292). 
18.2  Acceptable Means of Compliance: As the Base Station operates in duplex mode and comprises a separate transmitter and receiver, the receiver audio output may be used as the signal source for the recording equipment for Land Mobile Station transmissions. A separate receiver will be required as a signal source for the Base Station transmissions. 
18.3  Recommendation: Automatic recording facilities should be provided on communications channels used for the control of vehicles on the manoeuvring area (293). [ICAO Annex 11 6.3.1.2] 
19  Provision of Off-air Sidetone 
NOTE:  Reference should be made to Part C Section 1, COM 03 Communications Control Systems, RTF Communications.  Voice 
Where Off-air sidetone is provided for Air Traffic Services, it shall be a replica of the transmitted voice communications without any degradation of quality such as to cause annoyance or disturbance to the operator (294). 
NOTE:  The Acceptable Means of Compliance and Guidance in paragraph 7.2.1. can be applied as appropriate to the provision of Off-air Sidetone. 
20  Unintentional or Continuous Transmissions 
NOTE:  Reference should be made to Part C Section 1, COM 03 Communications Control Systems, RTF Communications.  Voice 
20.1  The equipment and systems at Aeronautical Radio Stations shall not fail in a manner such as to cause unintentional or continuous transmissions (295). 
20.2  Recommendation: New equipment and systems at Aeronautical Radio Stations should incorporate features to prevent unintentional or continuous transmissions, unless this is contrary to the intended purpose for which they have been designed (296). For existing equipment and systems, consideration should be given to incorporating such devices by retrofit, modification or add-on circuitry where appropriate (297). 
　
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