Aircraft Reliability – Interrogation considerations

The considerations for an aircraft reliability program and interrogation considerations can be initially daunting in the concept as to how we control the data, what we choose and how we determine its value.

There are regulations that require the reliability program for an aircraft and within the document there is also guidance. If we consider a EASA document there is a couple of bits to be aware of initially, it can be easy to skip the introduction in the regulation and go directly to the regulation itself.

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Aircraft Leases & Engine Removals

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When an aircraft is leased out from the lessor to a lessee there is a multitude of different requirements that must be satisfied and for the engine removals and subsequent installation and or storage.
 
Some of these requirements apply directly to high value components on the aircraft such as the engines. In many cases the engines are the single highest value part of the aircraft regarding a single component.
 
The engine, of course, is expected to wear and has a defined lifespan for some parts. Additionally, the engine is exposed to risk from impact or ingestion (such as a bird), or even just damage from a surge in severe weather conditions which can all result in the engine being damaged.

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Aircraft Leasing and “Quiet Enjoyment” contract conditions.

While the aircraft is leased the lessor wants to maintain the value of the asset and in doing so wants to be updated as much as possible as to the aircraft’s condition and status etc. This is of course important, but there could be a level where this management of the asset could become intrusive and costly for a lessee if there was no guidance or conditions for this process.

There are multiple conditions and updates that must be regularly provided to the lessor at all times throughout the lease and to protect the lessee we often refer to a term called “Quiet Enjoyment”.This is basically the right of a lessee to operate the aircraft without intrusive and costly requirements from the lessor for in-depth records reviews.

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Aircraft Reliability –value of data vs informationand effectiveness of your reliability program

When we mention aircraft reliability, we open up a lot of different topics all at once; ultimately though we get out what we put in as with many systems such as safety management also.

It is important to know the difference between data and information –information can be created from data. Data on its own can be meaningless or hard to interpret, the data is just facts and details for example that we must analyse.

The reliability programme is only going to be as good as you make it by determining the needs and objectives you want to achieve.

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Aircraft Leasing and Installation of Loan or 3rd Party Components. 

If you lease an aircraft, then you are making a legal agreement with the lessor, and they of course will want to maintain their asset and always have financial security of the asset. It means that the aircraft leasing agreement will have conditions for the installation of loan or 3rd Party components. 

This can be a challenge in certain circumstances such as a leased aircraft for example where the title engine needs to be overhauled and the aircraft needs to continue in operation. For this to occur it means the engine must be removed (the title engine that came with the lease) and another engine must be installed. This engine being installed may well be a loan engine or a pool engine for example, meaning it does not belong to the lessee and it might also not be owned by the lessor of the aircraft. 

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