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Aerodrome Safeguarding assessments

Aerodrome Safeguarding Assessments

Why undertake Aerodrome Safeguarding Assessments?

Buildings and structures can present a collision risk to aircraft using particular airports. It is important to determine whether a planned development will be acceptable. Assessments can be undertaken for civil airports, military airbases and smaller airfields.

What are the benefits of undertaking an Aerodrome Safeguarding Assessment?

Airports and airfields are often consulted regarding developments in their vicinity. An Aerodrome Safeguarding Assessment can accurately inform both developer and airport operator as to whether a building development is likely to be acceptable. This enables both the building development process and the airport safeguarding process to be efficient, professional and cost-effective.

A careful Aerodrome Safeguarding Assessment can enable the size of a planned development to be maximised whilst ensuring that it does not cause an unacceptable impact on aircraft operating from nearby runways.

How are Pager Power Aerodrome Safeguarding Assessments undertaken?

A series of Obstacle Limitation Surfaces (OLS) are defined around an aerodrome. The main surfaces considered are the Take Off Climb Surface (TOCS), the Approach Surface, the Inner Horizontal Surface (IHS), the Conical Surface and the Outer Horizontal Surface (OHS).

The surfaces originate at the runway ends with their dimensions and slope being dependent on runway length. The calculation methodology is similar, but not necessarily identical, for most civil and military airports throughout the world. Proposed developments that are higher than an OLS surface are said to breach the surface whilst developments that fall entirely beneath a surface are said to be clear.

Whilst the OLS can extend up to 15km from an airport obstacles can have an impact beyond this distance – having an impact on Instrument Flight Procedures (IFPs) which are protected using a different system known as PANS-OPS.

What does a Pager Power Aerodrome Safeguarding Assessment typically include?

Typically an assessment includes:

  • Details of the proposed development
  • Details of the assessed runways and aerodrome
  • Assessment methodology
  • Charts showing the relevant surfaces and the proposed development
  • Calculations showing the extent to which the proposed development breaches or clears the relevant surfaces
  • Summary of results
  • Mitigation advice
  • Conclusions and recommendations


What types of development are typically assessed?

Typically the following are assessed:

  • Industrial developments
  • Wind turbines
  • Telecommunications towers
  • Chimneys and stacks
  • Larger housing developments
  • Hangars and airport buildings


When should you consider undertaking an assessment?

There are no hard and fast rules; however assessments are more likely to be useful when one or more of the following occur:

  • The development is within 5km of a minor airfield
  • The development is within 15km of a major aerodrome
  • The development height exceeds 150 metres
  • The development is on high ground relative to the aerodrome
  • A safeguarding assessment is requested by the aerodrome or the local planning authority
  • The development location appears on an aerodrome safeguarding map


Which countries require Aerodrome Safeguarding Assessments?

The rules for assessments throughout the world stem from International Civil Aviation Organisation (ICAO) requirements. These generally apply to civil, military and minor airfields throughout the world. Pager Power has undertaken Aerodrome Safeguarding Assessments in:


Next steps

If you are planning a development that may need a Pager Power Aerodrome Safeguarding Assessment please get in touch – we can advise whether an Aerodrome Safeguarding Assessment may be able to help your development progress.

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