Closing MEL Items: Why Sooner is Better
It is not always possible to repair a system failure before the next flight. The MEL permits the dispatch of an aircraft with inoperative equipment or functions for a limited period of time, and under specific conditions, while maintaining an acceptable level of safety. Current in-service data shows an increase in the number of requests for MEL extension indicating an increase of departures with multiple open MEL items. Even if dispatch under MEL always guarantees an acceptable level of safety, it increases the risk of exposure to multiple failures with their inherent operational consequences. This article recalls the importance of fixing MEL items at the earliest opportunity to reduce this risk of exposure to multiple failures, and provides best practices where MEL extensions are necessary to maintain the highest possible margin of safety.
Ensuring a Correct Aircraft Technical Configuration
Flying on an aircraft with an incorrect aircraft technical configuration can cause unexpected system behaviors that could lead to an accident or a serious incident. This can occur when an aircraft is dispatched with hardware or software that is not authorized to be installed on that aircraft. Incorrect technical configuration or documentation can also create inconsistency between the documentation and the actual aircraft technical configuration.This article recalls the key aspects of technical configuration management. It highlights the importance of checking the Part Number (P/N) of the hardware and software and describes the tools that Airbus has developed to help operators make sure that they install the appropriate P/N on their aircraft.
A Recall on the Correct Use of the MEL
The dispatch under a Minimum Equipment List (MEL) item enables the dispatch of an aircraft in a safe and airworthy condition when certain system functions or equipment are temporarily unavailable or inoperative. This enables the aircraft to continue earning revenue without compromising the safety of the flight.However, what are the MEL principles and are there good practices to apply when dispatching an aircraft with an MEL item in the technical logbook?