* * * FOR ALL
TASK 72-00-00-200-805
1 . General.
A.This procedure gives instruction to do an inspection on assembled engine schedule shop visit and quick turn shop visit engines.
2 . Tools, Equipment, and Materials.
NOTE:
You can use equivalent alternatives for tools, equipment, and consumable materials.
A.Tools and Equipment.
(1)Special Tools. None.
(2)Standard Tools and Equipment. None.
(3)Locally Manufactured Tools. None.
B.Consumable Materials. None.
C.Referenced Procedures.
 
ATA No.
Description
 
05-11-00
Life Limits of Engine Parts
 
05-21-00
Mandatory Inspections
 
05-22-00
Manufacturer's Recommended Engine Scheduling and Inspection Information
 
72-00-00
Inspection 003
D.Expendable Parts. None.
3 . Specific Inspection Procedure for Scheduled Maintenance Engines.
Subtask 72-00-00-220-047
A.Do the inspections identified in the engine manual (EM) Chapter 05 sections:
(1)For manufacturer’s recommended maintenance. Refer to TASK 05-22-00-200-801 (05-22-00, LIFE LIMITS 001).
(2)For mandatory inspections as specified in the piece part sections of the engine manual at each piece part exposure. Refer to TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001).
(3)For module level inspection when an engine is in the shop for HPT rotor or HPT stator piece part disassembly and inspection. Refer to TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001).
NOTE:
TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001) defines the manufacturer’s recommended engine scheduling and inspection information.
Subtask 72-00-00-220-048
B.Do an inspection of the engine accessories installed or removed from the engine:
(1)Do a general visual inspection (GVI) of control and accessory components, either installed or removed for access. If defects are observed, refer to TASK 72-00-00-200-807 (72-00-00, INSPECTION 003) or to the applicable Component Maintenance Manual (CMM) for serviceability limits and repairs.
NOTE:
A GVI is an inspection check. This is a visual inspection that will find apparent unsatisfactory conditions and defects.
Subtask 72-00-00-220-049
C.Do an inspection of the engine condition before the induction to ensure workscope effectiveness:
(1)Make sure that the engine performance trends are satisfactory and that the engine will have adequate performance margin to return to a service condition.
(2)Make sure that the engine has Life Limited Parts (LLP) stub life consistent with post repair goals. Refer to TASK 05-11-00-200-801 (05-11-00, LIFE LIMITS 001).
(3)If possible, make sure that all engine related fault messages within the central maintenance computer (CMC) fault history or in the electronic engine control (EEC) and engine monitoring unit (EMU) non-volatile memory (NVM) have been reviewed and appropriate maintenance action identified for the engine and parts.
NOTE:
TASK 05-11-00-200-801 (05-11-00, LIFE LIMITS 001) defines rotating and static structure parts that have life limitation in relation to the time in service.
NOTE:
Soft life thresholds are those life thresholds published in either the GEnx Workscope Planning Guide or the operators approved customized Repair Specification.
Subtask 72-00-00-220-050
D.Do a borescope inspection to the modules as follows:
(1)Booster. Refer to AMM B787-A-G72-00-00-00B-280C-A.
(2)High pressure compressor (HPC). Refer to AMM B787-A-G72-00-00-06B-280C-A.
(3)Combustor and high pressure turbine (HPT) stage 1 nozzle leading edge. Refer to AMM B787-A-G72-00-00-07B-280C-A.
(4)HPT. Refer to AMM B787-A-G72-00-00-09B-280C-A.
(5)Low pressure turbine (LPT). Refer to AMM B787-A-G72-00-00-10B-280C-A.
4 . Specific Inspection Procedure for Quick Turn (Q/T) or Continued Time Engines.
Subtask 72-00-00-220-051
A.This procedure gives inspection requirements for quick-turn (Q/T) engines or low maintenance (continued time) engines. A Q/T and low maintenance workscope is defined as either one or a combination of the following:
(1)An engine that has a shop visit for designated Service Bulletin activity. There could be more than one Service Bulletin applied at one time.
(2)An engine that has limited maintenance activity that results in the engine being continued time.
(3)Engines that are reworked in accordance with special procedures where partial disassembly is performed to enable access to specific components.
(4)Engines defined as Q/T in a GE Product Support Engineering (PSE) workscope or Service Bulletin.
NOTE:
During these activities the engine will be considered to be continued time. Continued time is defined as there is no maintenance action that would result in extending the next scheduled shop visit of the engine from what it was originally scheduled.
Example: An engine has heavy maintenance activity (e.g. HPT rotor or stator overhaul) that results in a scheduled shop visit following the accumulation of approximately 3500 cycles. After 1000 cycles the engine has minor maintenance activity in accordance with 72-00-00 low maintenance activity. The engine is returned to service with the scheduled shop visit to occur in 2500 cycles. Thus, the original intended 3500 cycles between scheduled shop visits for heavy maintenance is kept. Cyclic life is used for example only.
Subtask 72-00-00-220-052
B.Do the inspections identified in TASK 05-22-00-200-801 (05-22-00, LIFE LIMITS 001):
NOTE:
TASK 05-22-00-200-801 (05-22-00, LIFE LIMITS 001) defines the manufacturer’s engine scheduling and inspection information.
Subtask 72-00-00-220-053
C.Do an inspection of the engine condition before the induction to ensure workscope effectiveness:
(1)Make sure that the engine performance trends are satisfactory and that the engine will have adequate performance margin to return to a service condition.
(2)Make sure that the engine has LLP stub life consistent with post repair goals. Refer to TASK 05-11-00-200-801 (05-11-00, LIFE LIMITS 001).
(3)If possible, make sure that all engine related fault messages within the CMC fault history or in the EEC and EMU NVM have been reviewed and appropriate maintenance action identified for the engine and parts.
(4)During low maintenance, quick turn activity or continued time shop visits, soft life thresholds for modules and accessories could be exceeded.
NOTE:
TASK 05-11-00-200-801 (05-11-00, LIFE LIMITS 001) defines rotating and static structure parts that have life limitation in relation to the time in service.
NOTE:
Soft life thresholds are those life thresholds published in either the GEnx Workscope Planning Guide or the operators approved customized Repair Specification.
Subtask 72-00-00-220-054
D.Do a borescope inspection to the modules as follows:
(1)Booster. Refer to AMM B787-A-G72-00-00-00B-280C-A.
(2)HPC. Refer to AMM B787-A-G72-00-00-06B-280C-A.
(3)Combustor and HPT stage 1 nozzle leading edge. Refer to AMM B787-A-G72-00-00-07B-280C-A.
(4)HPT. Refer to AMM B787-A-G72-00-00-09B-280C-A.
(5)LPT Refer to AMM B787-A?G72-00-00-10B-280C-A.
Subtask 72-00-00-220-055
E.Do a GVI of all visible engine parts as follows:
(1)Do a GVI of all parts that are removed. If defects are observed, estimate serviceability with reference to the following publications, in the listed order :
•
Applicable Continued-Time EM Special Procedures or Service Bulletins.
•
Aircraft Maintenance Manual (AMM).
•
CIR Module-Level Inspections (72-00-XX).
•
Piece-Part Level Inspections (CIR 72-XX-YY).
(a)This does not apply to HPC stage 5 blisk tip discoloration. One time blisk is removed from HPC rotor, tip discoloration must be inspected. Refer to TASK 72-31-44-200-801 (72-31-44, INSPECTION 001) for piece-part level inspection.
(2)Do a GVI of all parts that were not removed but are exposed because of removal of other engine parts. If defects are observed, estimate serviceability with reference to the following publications, in the listed order:
•
Applicable Continued-Time EM Special Procedures or Service Bulletins.
•
Aircraft Maintenance Manual (AMM).
•
CIR Module-Level Inspection (72-00-XX).
•
Piece-Part Level Inspections (CIR 72-XX-YY).
(3)Do a GVI of all control and accessory components, either installed or removed for access. If defects are observed, estimate serviceability with reference to the following publications, in the listed order:
•
Applicable Continued-Time EM Special Procedures or Service Bulletins.
•
Aircraft Maintenance Manual (AMM).
•
Component Maintenance Manual (CMM).
NOTE:
Continued removal of parts (disassembly) is not necessary if the exposed parts are in a serviceable condition by visual inspection.
NOTE:
A GVI is an inspection check. This is a visual inspection that will find apparent unsatisfactory conditions and defects.
NOTE:
During low maintenance and or Q/T activity, components identified in TASK 05-21-00-200-801 (05-21-00, LIFE LIMITS 001) that become piece part must have the mandatory inspections performed, unless a Service Bulletin or special procedure applicable to the maintenance performed defines that the mandatory inspection does not need to be accomplished.