AOG Explained: Industry Term for Aircraft Grounded Pending Repair, and How to Prepare for Parts Requests
Why It MattersParts sourcing speed in AOG events turns on operator readiness and information quality rather than supplier effort alone, which shapes how quickly grounded aircraft return to revenue service across the aftermarket.
What happened
AOG stands for "aircraft on ground" and describes an aircraft that cannot fly until a technical problem is fixed, often because a part is needed. It is an industry term for urgency, not a regulatory status.
The guidance behind this explainer holds that preparation makes the biggest difference to how quickly a part is obtained. It covers what a supplier needs in order to quote quickly, how to read condition codes in plain language, and what operators can prepare before an AOG event occurs.
Responsibility for airworthiness remains with the operator. Whoever supplies a part, the installer and operator must still confirm that it is acceptable for the aircraft.
Industry impact & what to watch
AOG is a label for urgency, so it carries no formal status and triggers no regulatory process. What changes is the pace of the commercial chain: the aircraft earns nothing while grounded, and every hour spent clarifying a part number, a configuration or an acceptable condition is an hour added to the downtime.
That is why the guidance puts preparation ahead of speed of response. A supplier can only quote quickly against complete and accurate information, and an operator that has gathered its aircraft details and its acceptance criteria before a fault occurs removes the slowest step from the process. Condition codes then work as shared shorthand, but only if both sides read them the same way.
The accountability point matters to anyone buying or brokering parts under time pressure. Fast sourcing does not move airworthiness responsibility away from the operator, so a quick quote is only useful if the part is also confirmed as acceptable by the installer and operator.
