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14.1  Where computer simulation is used to define an MLS sensitive area, or to support a case for a system remaining operational during construction work, the following are required:
a) Proof that the version of software being used is the latest issue, OR recent written confirmation from the software manufacturer that the version being used has no known safety-related problems (2246);
b) Proof that the person making the simulation has received formal training in the use of the simulation programme (2247);
c) Evidence to support that the model is suitable for the intended simulation (2248); and
d) Evidence to support the correlation of the modelling tool with field measurements,
e.g. Flight Inspection results (2249).
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MLS 01 Annex 1 Guidance Material Relating to the Automatic Calculation of MLS Category
Condition  Display 
Failure of Azimuth standby transmitter  Cat II 
Failure of Elevation standby transmitter  Cat III 
Changeover to Azimuth standby transmitter  Cat II 
Changeover to Elevation standby transmitter  Cat III 
Far Field Monitor alarm  Cat I 
Where a single battery is used: 
Low battery voltage alarm  Cat I 
Where each transmitter has its own battery and warning 
system: 
Low voltage alarm on one battery  Cat II 
Low voltage alarm on both batteries  Cat I 
Loss or corruption of data for calculation  MLS not available 
Where multiple monitor sets are used: 
Disagreement between monitors  Cat III 
Reciprocal system on  MLS not available 
Status of reciprocal not known  MLS not available 
Local control  MLS not available 

NOTE 1:  This information is not exhaustive since the operation of the CSU is dependent on the monitoring system of each type of MLS equipment.
NOTE 2:  This information relates only to the displayed category. Consequent actions, such as controlled withdrawal from service, are covered by the operator’s procedures.
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MLS 02 Microwave Landing System (MLS) Flight and

Ground Inspection Requirements
1  Introduction
1.1  Article 205 (5) of the Air Navigation Order, as amended, permits the UK CAA to include a condition on an Article 205 approval requiring that the equipment be flight checked by an approved person.
1.2  The purpose of this document is to ensure that Microwave Landing Systems (MLS) are maintained and operated within defined limits.
2  Scope
2.1  These requirements apply to MLS with the following configuration:
.
ILS lookalike;

.
high rate approach azimuth guidance;

.
clearance not provided by pulses;

.
no Out-of-Coverage Indication (OCI) signals;

.
no back azimuth.

2.2  This document defines the:
.
inspection interval;

.
limits to be applied to all parameters measured; and

.
types of inspection.

2.3  Work is ongoing to investigate requirements for checking multipath. Once these have been established, they will be included in this set of requirements.
3  Safety Objective
The equipment shall provide a complete, identified, accurate and uncorrupted source of guidance information to aircraft (2283).
4  Inspection Interval
For MLS facilities, the prescribed interval between successive inspections is 180 days (2284).
5  Tolerances
5.1  A tolerance of ±20 days is applicable to the prescribed intervals. Operators shall strive to ensure that inspections take place as closely as possible to the prescribed intervals (2285). If the previous inspection lasted more than one day, the interval shall be calculated from the date when the inspection started (2286).
　
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