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8.2  All aircraft, except gliders, in class A-C airspace in the UK are required to have and operate Mode-S transponders from 1 October 2009.
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SUR 02 Guidelines for Surveillance System Approval Part 1 Preliminary Material
1  Introduction 
1.1  All ATC surveillance systems intended for use at civil aerodromes in the United Kingdom require approval under Article 205 of the ANO. Prior to approval the CAA requires applicants to carry out a range of assessments. The scope and degree of any assessment will depend on the following aspects: 
a) The complexity of the proposed system. 
b) The experience and credentials of the equipment supplier and the user. 
c) The safety classification of the system. 
d) The 'track record' of the equipment. 
e) The Operational Requirement (OR). 
1.2  The CAA may supplement the requirements outlined in this document, throughout the project lifecycle, with requests to elaborate on various aspects. The Applicant is free to enquire about these at any time. 
2  Scope 
This document applies to all surveillance sensor equipment providing data for an Aerodrome ATS and requiring approval under Article 205 of the ANO. It sets out the project phases requiring the involvement of the CAA during the lifecycle of surveillance equipment and the requirements that the equipment must meet. 

Part 2 Requirements
3  Project Lifecycle Milestones
3.1  The following stages in a surveillance project involve decisions which affect the final system. At these stages the Applicant should forward the documentation raised to the CAA for stage assessment:
a) Operational requirements (302).
b) Requirements capture (303).
c) Project management (304).
d) System hazard analysis (305).
e) Frequency allocation (306).
f) Design and theoretical assessment (307).
g) Radio site clearance (308).
h) Post installation support assessment (309).
i) Flight trial (310).

4  Requirements of Applicant
4.1  Ownership
The Applicant shall identify the ownership of and operational responsibilities for the equipment (311).
4.2  Project responsibilities The following posts and lines of communication require definition. a) Applicant The person to whom the CAA will issue the approval (312). The Applicant shall identify an appropriate contact at the Aerodrome through whom
the CAA would channel requests for information (313). b) ATS Provider This person is the holder of the ANO Article 169 approval to provide the ATS service
at the facility (314).
5  Hazard Analysis
5.1  The Applicant shall produce a model of how the function of the equipment is to fit within the ATC environment (315). This will consider the effects resulting from a failure or loss of integrity of the equipment and its implications for ATC safety. Such a model would derive the critical components, determine the resultant failure modes and the results of such failures. From such a model, determine the following aspects:
a) The required reliability and integrity of the system (316).
b) Maintainability requirements; e.g mean time to repair (MTTR) (317).
c) Degree of design assurance required (318).
d) The accuracy and resolution requirements of the system (319).
e) Coverage requirements (320).
f) Data handling capacity (321).
g) The Target Level of Safety (TLS) for the operational service (322).

6  Frequency Allocation and Clearance to Transmit
6.1  At this point it is usual to make a request for frequency allocation. This takes place in two parts:
a) Primary. (Frequency)
b) Secondary. (Clearance to transmit)

6.2  The CAA co-ordinates the allocation of codes, PRF and frequency along with the National IFF/SSR Committee and AP 8.
　
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