SB Compliance Codes

The following P&WC compliance guidelines apply to service bulletins issued or revised after August 8, 1998.

Bulletin Category	Implementation Timing Recommendation
Category 1	Before the next flight.
Category 2	The first time the aircraft is at a line station or maintenance base that can do the procedures.
Category 3	Within _???_ hours or _???_ cycles.
Category 4	The first time the engine or module is at a maintenance base that can do the procedures, regardless of the scheduled maintenance action or reason for engine removal.
Category 5	When the engine is disassembled and access is available to the necessary subassemblies (i.e. module, accessories, components, or build groups). Do all spare subassemblies.
Category 6	When the subassembly (i.e. module, accessories, components, or build groups) is disassembled and access is available to the necessary part. Do all spare subassemblies.
Category 7	When the supply of superseded parts is fully used.
Category 8	Optional - can be done at the operator's discretion.
Category 9	Spare Parts Information Only. Old and new parts are directly interchangeable and operators can mix old and new parts.
Category 10	For information only.
Category 11	This Service Bulletin is issued to document the modifications done on all engines, after engine certification but before aircraft entry into service. The result is that no Pre-SBXXXXX configuration will appear in the technical publications for the modification accomplished prior to aircraft entry into service.
Category CSU	Operators who participate should include this service bulletin at the next maintenance or overhaul of the engine. For conditions which could result in an in-flight shutdown, significant loss of power/thrust or any other similar situation affecting flight safety.


Group/Code	Compliance Statement
A	For conditions which could result in an in-flight shutdown, significant loss of power/thrust or any other similar situation affecting flight safety.
A1A	Recommended - Urgent. P&WC recommends (Alert SBs) accomplishment prior to next flight. An Airworthiness Directive has been requested.
A1B	Recommended - Most desirable. To be accomplished during next visit to a facility where specified maintenance action(s)/modification(s) can be accomplished.
A1C	Currently not used.
A1D	Recommend - Highly desirable. To be accomplished prior to part life expiry or within _???_ hours (or _???_ cycles).
A2	Recommend - Highly desirable. P&WC recommends accomplishment at first shop visit of module/engine/power section/RGB/accessory regardless of extent of disassembly.
B	For conditions which affect engine life (PERs) and operating costs:
B3A	Recommended - Desirable. P&WC recommends accomplishment when disassembly of engine/power section/RGB/accessory is sufficient to afford access to the affected module/subassembly.
B3B	Recommended - Desirable. P&WC recommends accomplishment when disassembly of engine/power section/RGB/accessory is sufficient to afford access to the affected part.
B4	Recommended - Incorporation applicable on attrition of prior configuration parts when supply of such items is depleted.
B5	Optional - At the discretion of an operator. P&WC recommends accomplishment based on operator's experience with prior configuration parts.
B6	Informational - For record purposes and/or to provide useful technical information or to support engine operation/maintenance/logistics.