Technical Publications

Category 1

P&WC recommend to do this service bulletin before the next flight.

Category 2

P&WC recommend to do this service bulletin in the first time the aircraft is at a line or maintenance base that can do the procedures.

Category 3

P&WC recommend to do this service bulletin within ____ hours or ____cycles.

Category 4

P&WC recommend doing this service bulletin 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

P&WC recommend to do this service bulletin when the engine is disassembled and access is available to the necessary subassembly (i.e. module, accessories, components, or build groups). Do all spare subassemblies.

Category 6

P&WC recommend doing this service bulletin when the subassembly (i. e. module, accessories, components, or build groups) is disassembled and access is available to the necessary part. Do all spare sub-assemblies.

Category 7

You can do this service bulletin when the supply of superseded parts is fully used.

Category 8

This service bulletin is optional and can be done at the discretion of the operator.

Category 9

Spare Parts Information.

Category 10

For information only.

Category 11

This is the old Omnibus category of Service Bulletin and is no longer in use except for the PW1000 program. This paragraph is being kept for historical purposes only. 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 or the modification accomplished prior to aircraft entry into service.

Category 15

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 discretion of Customer Engineering.

Category 1

It is recommended to do this service bulletin before the next flight.

Category 2

It is recommended to do this service bulletin the first time the aircraft is at a line or maintenance base that can do the procedure.

Category 3

It is recommended to do this service bulletin within ___ hours or ___ cycles.

Category 4

It is recommended to do this service bulletin 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

It is recommended to do this service bulletin when the engine is disassembled and access is available to the necessary subassembly (i.e. module, accessories, components, or build groups). Do all spare sub-assemblies.

Category 6

It is recommended to do this service bulletin when the subassembly (i. e. module, accessories, components, or build groups) is disassembled and access is available to the necessary part. Do all spare sub-assemblies.

Category 7

You can do this service bulletin when the supply of superseded parts is fully used.

Category 8

This service bulletin is optional and can be done at the discretion of the operator.

Category 9

Spare Parts Information.

Category 10

For information only.

Category 11

This is the old Omnibus category of Service Bulletin and is no longer in use except for the PW1000 program. This paragraph is being kept for historical purposes only. 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 or the modification accomplished prior to aircraft entry into service.

Category 15

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 discretion of Customer Engineering.

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.