b) Glidepath aerials shall be brand new or factory refurbished and re-tested to the original factory test specification (1476); and c) All aerial feeder cables shall be renewed (1477).
18 Grass Height
18.1 When considering the grass height around the Localiser and Glidepath the operator should refer to CAP 772 Birdstrike Risk Management for Aerodromes, Chapter 4, paragraph 2.7.3, Potential Effect of Grass Height on Navigational and Visual Aids.
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ILS 10 Annex 1 Method of Putting an ILS with an
Established Mean Time Between Outages (MTBO) into Service
1 Conditions which must be met for this abbreviated method of approval to be used:
1.1 The manufacturer’s calculated MTBO meets ICAO SARPs with a 90% confidence level (2198).
1.2 In service MTBO data meets ICAO SARPs with a 90% confidence level (2199).
1.3 The system(s) considered as part of the In Service MTBO assessment shall be identical system(s) and cover the range of environmental conditions encountered in the UK (2200).
1.4 The systems are installed and maintained to acceptable standards (e.g. manufacturer’s installation and commissioning specifications) (2030).
1.5 The organisation making the installation has a good quality record and can provide evidence of staff competence (2034).
2 If the above conditions are satisfactory:
2.1 Carry out all the necessary tests. e.g. Commissioning, Site Acceptance and flight inspection (2201).
2.2 Run system continuously for 24 hours for CAT 1 and 300 Hours for CAT II/III, on either transmitter in the case of dual equipment (2202).
2.3 If there are no outages, put into service at the appropriate Category (2203).
2.4 Start continuous MTBO monitoring, initialising the figures for: a) CAT 1 Localiser and Glidepath at 1250 hours (2204). b) CAT II/III Localiser at 5000 hours (2205). c) CAT II/III Glide Path at 2500 hours (2206).
2.5 Continue to monitor MTBO using normal processes. A confidence level of 60% may be used (2207).
NOTE: 'Outage' in these calculations means a total unplanned loss of signal due to a fault. Automatic changeover to the standby transmitter, after a fixed delay if appropriate, is not classed as a failure.
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MLS 01 General Requirements for Microwave Landing System (MLS)
Part 1 Preliminary Material
1 Introduction
1.1 MLS is a precision approach and landing guidance system which provides position information and various ground to air data. The position information is provided in a wide coverage sector and is determined by an azimuth angle measurement and elevation angle measurement and a range (distance) measurement. (ICAO Annex 10 Volume 1 3.11.2.1)
1.2 MLS systems are classified as Category I, Category II or Category III in ascending order of integrity and reliability.
NOTE: Unlike ILS, the accuracy requirements for MLS are the same for all categories.
2 Scope
2.1 This document sets out the minimum equipment requirement for all categories of MLS used for ILS type approaches (often referred to as “ILS look-alike” approaches).
2.2 The scope of this document relates only to the performance of the MLS facility. The overall category of a runway is dependent on many other factors.
2.3 These requirements apply to MLS with the following configuration:
.
ILS look-alike.
.
High rate approach azimuth guidance.
.
Clearance not provided by pulses.
.
No Out of Coverage Indication (OCI) signals.
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