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4.3.2  The facility Identification shall be suppressed when the NDB is not available for operational purposes, e.g. under maintenance (2050).
NOTE:  The normal identity code may be radiated for short periods during maintenance or flight inspection as necessary.
4.3.3  Modulation Frequency The frequency of the modulating tone for identification shall be 400 Hz ±25 Hz (2051).
4.3.4  Change of Carrier Power during modulation
The carrier power of an NDB shall not fall by more than 0.5 dB when the identification signal is being radiated (2052).
4.4  Monitoring
4.4.1  Executive Monitor Action
An executive site monitor shall be provided to switch off the equipment in use and, if applicable, change over to the standby system in less than 1 minute if:
a) There is a change in radiated carrier power of more than +2 dB or .3 dB to that required for the rated coverage (2058).
b) A malfunction or failure of the means of self monitoring of executive parameters occurs (2059).
4.4.2  Non Executive Monitor Action
A Non-Executive Alarm will be generated within three minutes, if the NDB fails to transmit the correct identification code (2060).
4.4.3  Status Information
4.4.3.1  Flight Information Service Officers and/or Air Traffic Controllers directly responsible for approach, landing and take-off at the aerodrome(s) with which they are concerned shall be provided with information on the operational status of radio navigation services, on a timely basis, consistent with the use of the service(s) involved (2310).
4.4.3.2  Where status information is reliant upon a visual status indicator, then an audible alarm should be provided which indicates that the visual indicator has changed state (2311).
4.5  Standby Power Supply
An NDB shall be provided with suitable power supplies and means to ensure continuity of service appropriate to the needs of the service provided (2062).
4.6  Maintenance Requirements
4.6.1  NDB operators must regularly record the field strength of their NDB, as measured at a remote location (2063).
NOTE:  Measurement of field strength at a non-rated remote location is acceptable if correlation to measurement at rated range is traceable.
4.7  Flight Inspection
4.7.1  Commissioning flight inspections shall be made by an organisation having CAA approval for flight inspection of NDBs under the ANO (2064). Additionally, ATSD may, if it becomes concerned that the NDB is no longer performing to the SOC, request a flight check of the NDB, at the Service Provider’s expense, by an approved Flight Inspection Organisation.
4.7.2  Annual flight inspections may be conducted by local pilots (ideally Instructor rated). The pilot shall provide confirmation of the performance of the NDB as described in the table below (2065). The Air Traffic Service Provider shall formally record this confirmation (2066).
4.7.3  Pilots should consider the yawing motion of the aircraft when assessing the NDB.
4.8  Parameters to be measured
4.8.1  During commissioning and annual inspection the appropriate parameters in the following table shall be measured and be within limits. These checks need only be done on one transmitter.
Parameter  Limits  Periodicity and Measurement Method 
Accuracy within the DOC  ADF needle oscillations <± 10°. (2067) See Note 1  Commissioning Orbit at the DOC or 15NM, whichever is the smaller at Minimum Safe Altitude. 
Accuracy on Airways  ADF needle oscillations < ± 10°.(2068) See Note 1  Commissioning Following notified airways. Where an NDB supports many airways then one airway in each quadrant should be flown. 
Accuracy in Holding Patterns  ADF needle oscillations < ± 5°. (2069) See Note 1  Commissioning Following notified Holding patterns. 
　
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