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UK Civil Aviation Regulations

These are published by the CAA on our UK Regulations pages. EU Regulations and EASA Access Guides published by EASA no longer apply in the UK. Our website and publications are being reviewed to update all references. Any references to EU law and EASA Access guides should be disregarded and where applicable the equivalent UK versions referred to instead.



AAIB Report Boeing 737-800, G-JZHL

Safety Recommendation: 2022-018

Safety Recommendation Text



2022-018: It is recommended that the UK Civil Aviation Authority, in conjunction with other regulatory authorities, develop a set of technical specifications and, subsequently, develop certification standards for an on-board system that will alert the crew of an aircraft to abnormally low acceleration during take-off.

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The UK CAA, through our Design and Certification department, has been investigating any previous work into the development to monitor dynamic take-off performance with the ability to warn the pilot.
The UK CAA has discussed the development in this area with the FAA and EASA; whilst we do not believe either of these authorities are engaged in any certification activity of dynamic take-off monitoring, they both recognise the risk and have both positively engaged with us.

In addition, the UK CAA presented this topic at the FAA InfoShare, where contact was made with US airlines, regulators, and OEMs. Following this, we have had a workshop with Southwest Airlines that have shared their algorithms, and a follow-up with Boeing Safety team to discuss Boeing activities to find mitigations for this type of event. These are ongoing relationships; the UK CAA are facilitating a link for UK B737 operators directly with Southwest safety department.

The UK CAA has recently written to EUROCAE, requesting that a proposal be tabled at the next council meeting or Technical Advisory Committee to consider re-opening this working group to prepare MOPS / MASPS, which could ultimately form the basis of regulatory action that could reduce the number of take-off performance events.

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Status



Partially Adequate - Open

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Safety Recommendation: 2022-019

Safety Recommendation Text



2022-019: It is recommended that the UK Civil Aviation Authority encourage all UK Air Operator Certificate holders to implement into their flight data monitoring programme algorithms to detect the precursors relevant to the monitoring of take-off performance detailed in the European Operators Flight Data Monitoring Document, Guidance for the implementation of flight data monitoring precursors.

In response to the recommendation from this serious incident the CAA will engage with stakeholders and regulatory bodies to identify parallel workstreams and seek to maximise the safety benefit of FDM programmes.

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The CAA wrote to key airlines in December 2022 describing the safety concern and the activities we are considering. The letter contained information on current reliance on the human barrier to avoid the safety risk manifestation, and potential to use FDM data to detect the precursors or undetected events. The letter was well-received, and all agreed to support any associated initiatives.

The CAA hosted a preliminary workshop for the main airlines in January 2023, which introduced the CAA Bow Tie and barriers/controls. The workshop agreed an FDM workstream would be launched to determine what common markers could be used to ‘measure’ the size of the safety concern, and potentially identify unknown ‘near-misses’.

Other UK airlines are also active in investigating FDM potential to measure reduced performance margins. The various FDM threads will be brought together via the FDM group, including possible amendments to CAP739.

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Status



Partially Adequate - Open

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