The purpose of this report is to update the Board on key safety matters
NIRs and PIRs
The MAA of the average age of NIRs and PIRs has reduced slightly from 8.05 months reported at the March Board meeting to 7.86 months at the end of April. This is against a 2019 target of 7.5 months. The in-month average age in March fell to 7.43 months following the closure of a significantly aged NIR in the period. The value increased slightly in April but remains below the MAA target
The close out of older NIRs continues to be monitored at Safety Committee
External audit CARs
The monthly average age of open external audit CARs increased by the end of April to 6.16 months, continuing an upward trend since February. The MAA continued to trend upwards to 5.06 months by end of April as several older CARs remain open. This is above the target of 4.5 months set for 2019
The CAR escalation process has been reviewed and updated and agreed escalation actions are in hand. An action plan to prioritise the closure of older CARs will be presented at the May Safety Committee meeting
Mileage Based Maintenance
Porterbrook monitors cumulative mileage on passenger vehicles to ensure mileage-based maintenance events are undertaken within allowed limits. Planned extensions are managed to support service operation or maintenance lifecycle optimisation
There is currently a total of 96 vehicles with mileages above a maintenance event mileage threshold, all are within a controlled management regime
Appendix A contains a summary of the overdue maintenance trends by category
There are 7 open NIRs scored over 80. These continue to be actively managed to closure as a priority and progress is being monitored at Safety Committee. No new NIRs scored over 80 have been raised since the March Board meeting
The following NIR updates are included for information
NIR 3432 – Cl170 Bearing Failure Leading to Fire
NIR 3526 – Cl156 Modified Elite/KL Heat and Vent Unit – Intake Filter Fire
NIR 3528 – Cl170 Turbostar Gangway Bridge Plate Failure
NIR 3535 Cl455 AC traction pinion gear detached in service