Besides fuel prices and pilot problems, the #1 thing keeping aircraft operators up at night is the dreaded AOG. The very thought of an airplane stranded at some distant and unequipped airport is enough to turn even the most hardened veterans into insomniacs, biting their nails in a cold sweat as thousands in lost revenue and costs ratchet up faster than the US National Debt. The potential ripple effect, particularly when that aircraft is eating away at thin margins, is why a thorough AOG and reliable MRO (maintenance, repair and overhaul) strategy is so important.
An AOG has the uncanny ability to especially happen at the worst times. When it does, every minute that aircraft sits on the ground is critical. Although each situation has its own unique set of challenges, a lot of downtime can be avoided with prompt part sourcing and quick shipping on the ground and in the air.
AOG incidents typically follow a general pattern:
1. The airplane becomes disabled.
2. An airline or operator desperately and frantically calls its OEM and MRO for support.
3. An AOG team of quality inspectors, engineers, planners, and operations managers gets dispatched to assess the aircraft's condition.
4. A quality assessment is written up that details the problem that occurred and what parts are needed to rectify the condition.
5. The operator agrees to the scope of work and signs a contract to begin repairs.
6. Parts are ordered and additional personnel, tools, and equipment are rush delivered to the airframe site.
7. Repairs begin, and upon completion are signed off by a quality manager, assuring the aircraft is airworthy and ready for service once again.
8. Ideally, the aircraft can then be repositioned and returned to operation or if necessary, flown elsewhere to finish usually more complex repairs not possible at its AOG airport.