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5.2 Inspections may be made up to 7 days earlier than the due date without affecting the due date for the next inspection. If an inspection is made more than 7 days before the due date, the date of subsequent inspections shall be advanced.
6 Delays due to Adverse Weather
6.1 Occasionally, prolonged periods of adverse weather may prevent an inspection being completed within the permitted tolerance. If this occurs, the system may continue in operation for a further 25 days provided that a reduced flight inspection has been made within the permitted tolerance interval (2289).
6.1.1 Reduced inspection requirements:
Azimuth: part orbit ± 40° at not less than 5 NM from Approach Reference Datum (ARD) at Minimum Safe Altitude (MSA) for both transmitters (2290); and
Elevation: level slice on centre line from 0.3 theta to 1.75 theta, for both transmitters (2291).
7 Supplementary Flight Inspections
7.1 A supplementary flight inspection must be made 90 days ±20 days after a periodic flight inspection if at that inspection any parameter was found outside the flight inspection tolerances stated in Table 1 or 2 below and subsequently adjusted (2292).
7.1.1 The above requirement can be relaxed if ground measurement and equipment monitors confirm the changes seen during the periodic flight inspection. In this case it would be acceptable to carry out more frequent ground monitoring and inspection of the equipment monitor records.
7.2 Only the parameters found out of tolerance need to be checked by the supplementary flight inspection.
7.3 A supplementary flight inspection may be requested by SRG at any time if the following conditions arise:
a) a regional inspector considers that any aspect of maintenance is not being correctly carried out;
b) an inspection of equipment monitor records, which may be requested at any time by SRG, shows any evidence of instability;
c) changes have been made within the safeguarded areas.
8 Field Monitors
Commissioning flight inspections shall be made with all field monitors that can have a significant effect on the signal in space installed in their final positions (2293).
9 Flight Inspection Organisations
All flight inspections shall be made by an organisation having CAA approval under the ANO for MLS flight inspection (2294).
10 Inspection after Engineering Work
Certain types of engineering work may require that the system be flight inspected before being returned to service. The ATS provider shall carry out an assessment to ascertain the scope of the flight inspection (2295).
11 Analysis of Flight Inspection Records
11.1 The Air Traffic Service Provider shall analyse the flight inspection report at the earliest opportunity for operational systems and prior to entering a facility into operational service to ensure that the flight inspection requirements are met (2341).
11.2 The Air Traffic Service Provider shall address any deficiencies or non-compliance to ensure a safe service is provided (2342).
11.3 An Air Traffic Service Provider may delegate the task of analysing the flight inspection report to a third party specialist organisation. This may be the flight inspection organisation that provided the report. The responsibility for addressing any deficiencies identified remains with the Air Traffic Service Provider (2343).
11.4 The person who conducts the analysis shall be competent to do so (2344). NOTE: This may include training on a specific flight inspection report format.
12 Inspection Criteria
Inspection results shall conform to the tolerances given in Tables 1 and 2 (2298).
13 Parameters to be Measured
Tables 1 and 2 below give details of the parameters that must be measured at each inspection.
14 Promulgated Procedure
14.1 At commissioning and on an annual basis an Instrument Rated pilot shall check the final turn onto all Instrument Approach Procedures (IAP) (2299). During the check the pilot shall observe any other navigational aids that are used to support the procedure (2300). The aim of this check is to ensure that any navigational signals used as part of the procedure, position the aircraft to allow the MLS to be correctly captured. Where several IAPs follow the same path, only one flight needs to be conducted as long as it ensures that all supporting navigational aids are checked.
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CAP 670 Air Traffic Services Safety Requirements 2(51)
