Service Bulletins

Service Bulletins commonly referred to as “SB’s” are airworthiness documents that originate from the original equipment manufacturer (OEM).
The purpose of these documents is a work instruction that may be anything from an inspection right through to a change of parts or the actual design.

The purpose of the Service Bulletin (SB) can vary and they aim to achieve many purposes including:
* Improve reliability
* Improve safety by reducing the risk
* Change a configuration – example thrust rating for an engine.
* Address an issue found to affect airworthiness – enforced by an AD (Airworthiness Directive)
* Change a process or maintenance task.

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Maintenance & Carry Forwards

During operation of an aircraft there are times when the short-term maintenance changes due to factors such as damage for example. If we think about an aircraft fuselage getting damaged in a turnaround at an airport, the aircraft might be allowed to continue in service for a number of cycles before the repair has to be completed; while this allows operation to continue, this is a maintenance action which we would not accept at a lease transition.

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Aircraft Transition – Delays

During an aircraft transition a delay is always going to have a negative impact for one party be it the lessor or lessee depending on which transition is occurring (Delivery & Re-Delivery).

With lease costs and delay clauses, the financial exposure can fast become large; it is an important consideration when considering factors such as the physical observations or findings from the review.

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Navigation Awareness – PBN, RNP & RNAV

PBN or Performance Based Navigation defines the navigation system performance requirements.

Common requirements are intended to ensure that there is worldwide commonality.

Area Navigation known as RNAV is a system which allows an aircraft to navigate in a way other than an airway; instead, we can fly a flight path. RNAV will use systems such as GPS, DME or inertial navigation systems as examples.

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