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(408) and corrective action taken in the event of failure (409). MATS Part 2 procedures should instruct the user of actions necessary in the event of failure (410).
[ICAO Annex 10 Aeronautical Telecommunications Volume I Paragraph 2.9 Secondary power supply for radio navigation aids and communication systems.]
7.1.4.4 Guidance: The incorporation of suitable conditioning devices as part of the power supply arrangements may be useful in preventing equipment malfunction due to surges, spikes and noise on the power supply.
7.1.5 Alarm / Status Indications
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 (411), 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 (412).
Recommendation: The Significance to the user of the indication of failure should be obvious from the indication given (413).
The failure indication should remain obvious to the user whilst the condition causing the failure indication remains (414). Consideration should be given to providing a power supply to the alarm indication that is not dependent upon the system it is monitoring (415).
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 (416). Attention should be drawn both when failures are detected and when they clear (417). Attention to subsequent status changes should not be masked (418). 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 (419).
7.2 Interface to Voice / Data Recording Equipment
7.2.1 The system at Aeronautical Radio Stations shall provide all the necessary signals and information to the Voice / Data Recording Equipment in compliance with Article 206 of the Air Navigation Order (420).
Acceptable Means of Compliance: For Aeronautical Radio Stations using a separate transmitter and receiver, the receiver audio output may be used as the signal source for the recording equipment. For Aeronautical Radio Stations using a transceiver, a separate receiver on the same frequency will be required.
Guidance: Where a separate transmitter and receiver are used, an 'off-air' sidetone will be present at the audio output of the receiver when the associated transmitter is operated.
Where a transceiver is used, the receiver is normally muted in transmit mode, and sidetone is not present at the audio output. A separate receiver and antenna can be used to derive an 'off-air' sidetone.
If a separate receiver is used to record aircraft station transmissions, the antenna and receiver combination must provide a signal comparable in strength and reception area to that of the main antenna and transceiver.
7.3 Provision of Off-air Sidetone
NOTE: Reference should be made to COM 03 Voice Communications Control Systems, RTF Communications.
7.3.1 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 (421).
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.
7.4 Provision of Emergency Frequency 121.500 MHz
7.4.1 The emergency frequency 121.500 MHz shall be provided at area control centres, aerodrome control towers and approach control offices serving international aerodromes and international alternative aerodromes (422).
7.4.2 Acceptable Means of Compliance: The equipment configuration shall be consistent with that for Air Traffic Control Services and shall, as a minimum, comprise of a main transmitter and receiver with emergency equipment providing redundancy, together with system and location dependent redundancy measures.
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CAP 670 Air Traffic Services Safety Requirements 2(12)
