Serious Incident G-JZHL
G-JZHL.
AAIB Report Boeing 737-800, G-JZHL
Safety Recommendation: 2022-018
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.
EASA have published their NPA 2025-01 (RMT.0741) which the whole of the EUROCAE / RTCA group were encouraged to read and comment back on before the deadline of 03rd October 2025.
The joint EUROCAE / RTCA working Group (WG129 SC244) continues to hold weekly working meetings and quarterly plenaries to progress the Take off Performance Awareness and Alerting System (TOPAAS) MOPS document we have started since the acceptance of our Internal report which confirmed the maturity of the current technology.
We have recently attended Plenary no 9 which also includes the 4 plenary meetings which we used for the production of the internal report for the TAC. During this last meeting the group agreed to an extension to the deliverable date as progress with the MOPS had not been as expedient as we had hoped. Our revised date which we are requesting of the TAC for publication of the MOPS is March 2027. With this timeframe, we continue to push for a mature draft document by September 2026.
Adequate – Open
October 2026
Safety Recommendation: 2022-019
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.
The CAA have published Safety Notice SN-2026/007: Take-off Performance on 16 July 2026.
The CAA believes that this action addresses the intent of the safety recommendation and looks forward to the AAIB's review of the Safety Notice.
Adequate – Open
December 2026