# General Electric Alert Service Bulletin 72-A0162: Revision 16

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- Document: [General Electric Alert Service Bulletin 72-A0162](https://openairdocs.org/service-documents/ge/72-a0162.md)
- Title as filed: U.S. DOT/FAA - CT58 SB 72-A0162 R16
- Pages: 27
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ENGINE - Service Life Limits for Rotating Parts
GE PROPRIETARY INFORMATION
The information contained in this document is GE proprietary information and is disclosed in con-
fidence. It is the property of GE and shall not be used, disclosed to others or reproduced without
the express written consent of GE, including, but without limitation, it is not to be used in the cre-
ation, manufacture, development, or derivation of any repairs, modi fications, spare parts, designs, or
configuration changes or to obtain FAA or any other government or regulatory approval to do so. If
consent is given for reproduction in whole or in part, this notice and the notice set forth on each page
of this document shall appear in any such reproduction in whole or in part.
This technical data is considered EAR controlled pursuant to 15 CFR Parts 730-774 respectively.
Transfer of this data by any means to a Non-US Person, whether in the United States or abroad,
without the proper U.S. Government authorization (e.g., License, exemption, NLR, etc.), is strictly
prohibited.
GEAE authorizes the Federal Aviation Administration to incorporate this document by reference in
an Airworthiness Directive.
Copyright (2015) General Electric Company, U.S.A.
July 09, 1979 CT58 S/B 72-A0162
Revision 16, January 07, 2015 PAGE 1 of 27

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ENGINE - Service Life Limits for Rotating Parts
TRANSMITTAL INFORMATION
REVISION 16 TO ALERT SERVICE BULLETIN 72-A0162
Revision 16 is issued to update paragraphs 1., P LANNING INFORMATION,3 . ,ACCOMPLISHMENT
INSTRUCTIONS, and 4., A PPENDIX A.
Revision 15 was dated January 09, 2014. Revision 14 was dated April 29, 2013. Revision 13
was dated June 13, 2012. Revision 12 was dated April 18, 2008. Revision 11 was dated March
01, 2005. Revision 10 was dated December 11, 2003. Revision 9 was dated October 06, 1998.
Revision 8 was dated June 16, 1997. Revision 7 was dated April 25, 1997. Revision 6 was dated
June 19, 1995. Revision 5 was dated May 12, 1994. Revision 4 was dated August 31, 1993.
Revision 3 was dated May 19, 1993. Revision 2 was May 22, 1985. Revision 1 was dated June 27,
1980. The original was dated July 09, 1979. Revision bars in the left margin identify changes.
1. PLANNING INFORMATION
A. Effectivity
This Alert Service Bulletin is applicable to the following engines:
CT58-100-2 CT58-110-1
CT58-110-2
CT58-140-1
CT58-140-2
B. Concurrent Requirements
None.
C. Description
Operators are required to maintain the service records of engine life-limited
rotating parts. Service hours and cycles (calculated according to paragraph 3.,
ACCOMPLISHMENT INSTRUCTIONS), must be compared to the limits in T ables I,
II, III, IV of this Alert Service Bulletin. Parts must be removed from service before
the life limits are exceeded.
NOTE: T ables I, II, III, and IV in this Alert Service Bulletin supersedes and replaces
the Airworthiness Limitations Section (ALS) of the Overhaul Manuals
SEI-102 and SEI-183 contained in section 72-00. Future changes to the
limits will continue to be made by revisi on of this Alert Service Bulletin.
For a copy of the Overhaul Manual SEI-102, contact CT58 Program
Manager. Refer to the address listed at the end of paragraph 3.B.(2) of
ACCOMPLISHMENT INSTRUCTIONS of this Alert Service Bulletin.
(1) Definitions:
(a) Cycle: de fined as any engine operating sequence involving an engine
start, one acceleration to takeoff power, and shutdown.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
(b) Non-Repetitive Heavy-Lift (Non-RHL) operations: de fined as an engine
start, acceleration to takeoff power, an average of less than two
additional landings or lift-carry-drop sequences per hour, and shutdown.
(c) Utility operations: de fined as an engine start, acceleration to takeoff
power, an average of two to ten additional landings or lift-carry-drop
sequences per hour, and shutdown.
(d) Repetitive Heavy-Lift (RHL) operations: de fined as an engine start,
acceleration to takeoff power, an average of more than ten additional
landings or lift-carry-drop sequences per hour, and shutdown.
(e) CSN: Cycles Since New
(f) TSN: Time Since New
(g) Shop Visit: de fined as the induction of an engine into a shop or facility
for maintenance in accordance with Overhaul Manual SEI-183.
D. Compliance
Category 1
GE recommends you do this Alert Service Bulletin to ensure safe operation of
CT58 engines in service.
Upon receipt of this bulletin, refer to T ables I, II, III, IV for life limits on all rotating
parts.
(1) The change of the Multiplying Factor for Utility and RHL Operations from 6.0
to 3.0 and reducing cycle life limit from 26,000 to 12,800 cycles, affecting
compressor spools P/N 5124T94G02, P/N 6010T57G04, P/N 6010T57G07,
and P/N 6010T57G08 can be complied with by utilizing the Field Management
Plan described in paragraph 4.A. of A PPENDIX A of this Alert Service Bulletin,
in order to minimize the operational impact on their fleets.
(2) Utility operators can utilize the Fi eld Management Plan described in paragraph
4.B. of A PPENDIX A of this Alert Service Bulletin, in order to minimize the
operational impact on their fleets.
E. Reason
(1) Objective:
This Alert Service Bulletin provides service life limits for rotating parts in all
operations and a method of counting cycles of life-limited parts for RHL and
Utility operations.
(2) Condition:
Engines primarily engaged in RHL or U tility operations have experienced
premature, low-cycle fatigue damage to some parts.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
(3) Cause:
The conventional basis for determining the number of cycles accumulated on
rotating parts has been de fined as a start, accelerate to takeoff power, and
shutdown in a speci fic time frame. The use and applications of CT58 powered
helicopters in Non-RHL operations have evolved to a much wider variety of
operations than originally taken into account.
(4) Improvement:
Evaluation of operator input has led to an update of the operational pro file
for Non-RHL operations to re flect the current operations of the Non-RHL
fleet. This revision of the Alert Service Bulletin has also been updated with
clarification of conversion factors for T able IV and examples of its use.
(5) Substantiation:
An analysis of the usage and inspection data of compressor spool parts used
in Non-RHL operations has shown that usage exceeds analytical models. A
risk assessment was conducted using a validated life approach for active
compressor spools with a conservative operational pro file as de fined during
the operator survey. The risk assessment indicated a need to reduce the cycle
life limit for Non-RHL operators. The updated limits in T able I and paragraph
4.A. of A PPENDIX A must be applied in accordance with paragraph 1.D.,
Compliance.
F. Approval
This Alert Service Bulletin has been reviewed by the FAA and the repair(s) and
modification(s) herein comply with the appl icable Federal Aviation Regulations
and are FAA APPROVED for installation in the model(s) listed in this Alert Service
Bulletin.
Revision 16 of this Alert Service Bulletin is approved by the Manager, Engine
Certification Office, ANE-140, by letter dated December 30, 2014, as an Alternative
Method of Compliance (AMOC) to Airworthiness Directives (AD) 2001-18-06 and
2008-22-16.
G. Manpower
No additional man-hours are required when compliance with this Alert Service
Bulletin is performed during normal overhaul.
H. Weight and Balance
Weight and balance are not changed.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
I. References (Use the latest version of any document)
Airworthiness Directive (AD) 2001-18-06
Airworthiness Directive (AD) 2008-22-16
SEI-102, CT58-100/-110 Overhaul Manual
SEI-183, CT58-140 Overhaul Manual
J. Publications Affected
Not applicable.
K. Previous Modification
Service Bulletin Number Service Bulletin Title
CT58 S/B 72-0078
(CEB-136)
Rework of Stage 2 Compressor Rotor Disk.
CT58 S/B 72-0084
(CEB-147)
Compressor Rotor Spool Rework (Life Limit Extension).
CT58 S/B 72-A0124
(CEB-204)
Reduction of Life Limits on Stage 2 Compressor Rotor Disk
Shaft.
CT58 S/B 72-A0125
(CEB-205)
Reduction of Life Limits for Stage 1 and Stage 2 Turbine
Wheels and Introduction of New Stage 1 and Stage 2
Turbine Wheels.
CT58 S/B 72-A0126
(CEB-206)
Inspection of Stage 1 and Stage 2 Turbine Wheels.
CT58 S/B 72-A0132
(CEB-216)
Reduction of Life Limits on Stage 1 Disk, Front Disk Shaft,
Rear Shaft, and Rear Seal of the Compressor Rotor.
CT58 S/B 72-A0146
(CEB-240)
Reduction of Service Life Limits of Compressor Rear Shaft
for External Lift Operators Only.
CT58 S/B 72-A0159
(CEB-255)
Inspection of Stage 1 Turbine Wheels.
CT58 S/B 72-A0173
(CEB-275)
Identification and Inspection of Suspect Gas Generator
Turbine Rotor Assembly Parts and Power Turbine Wheels
that may have been Inadvertently Shotpeened.
L. Interchangeability
Not applicable.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
2. MATERIAL INFORMATION
A. Material - Price and Availability
(1) Parts necessary to do this Alert Service Bulletin:
If serviceable spare parts with serviceable life remaining are not available for
replacement, the operator may purchase new parts from GE Aircraft Engines
or authorized distributor. Part numbers and names are shown in T ables I,
II, III, and IV.
(2) Consumables:
None.
B. Industry Support Information
Not applicable.
C. Configuration Chart
Not applicable.
D. Parts Disposition
T erminate replaced parts.
E. Tooling - Price and Availability
No special support equipment beyond that normally used during overhaul is
required for compliance with this Alert Service Bulletin.
3. ACCOMPLISHMENT INSTRUCTIONS
A. Perform the following on all installed and spare rotating parts listed in T ables I,
II, and III:
(1) Determine component part number and its t otal time (in hours) and cycles for
installed and spare parts as follows:
(a) For engines that have not been involved in RHL or Utility operations,
compare total hours and accumulated cycles to the limits for that part
number listed in T ables I, II, and III. Then, remove parts that exceed total
hours or cycle limits from service.
(b) For engines that have been involved in RHL or Utility operations,
determine calculated total cycles for each part in T ables I, II, and III.
Then, remove parts that exceed total hours or cycle limits from service
as follows:
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
1 Perform calculations with Multiplying Factor for Utility and RHL
Operations for T ables I, II, and III as follows:
a If a part has been in RHL or Utility operations (paragraph 1.C.(1)
of Description), multiply the total hours in RHL or Utility operation
by the Multiplying Factor for Utility and RHL Operations (found
in T ables I, II, and III) for that part. The resulting product is the
cycles for that part in RHL or Utility operation:
FORMULA FOR DETERMINING CALCULATED CYCLES IN RHL OPERATIONS
CALCULATED
CYCLES IN RHL
OPERATIONS
= HOURS FLOWN INRHL OPERATIONS X
MULTIPLYING FACTOR
FOR
UTILITY AND RHL
OPERATIONS
FORMULA FOR DETERMINING CALCULATED CYCLES IN UTILITY OPERATIONS
CALCULATED
CYCLES IN UTILITY
OPERATIONS
= HOURS FLOWN INUTILITY OPERATIONS X
MULTIPLYING FACTOR
FOR
UTILITY AND RHL
OPERATIONS
b Sum the cycles calculated in the above paragraph as well as
those accumulated during Non-RHL operations. The resulting
sum is the calculated total cycles:
FORMULA FOR DETERMINING CALCULATED TOTAL CYCLES
CALCULATED
TOTAL CYCLES =
CALCULATED
CYCLES
IN UTILITY
OPERATIONS
+
CALCULATED
CYCLES IN RHL
OPERATIONS +
CYCLES
ACCUMULATED
IN NON-RHL
OPERATIONS
2 Compare calculated total cycles to the cycle limits for that part
(found in T ables I, II, or III). If the part calculated total cycles exceeds
its cycle limit, remove the part from service.
(2) Examples for determining expended life of rotating parts:
(a) Stage 1 compressor disk P/N 5001T20P01 with no history of RHL or
Utility operation and 3,000 hours and 2,500 accumulated cycles in
Non-RHL service:
1 Part can be evaluated based solely on the accumulated cycles.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
2 Disposition:
Continue in service and apply a Multiplying Factor for Utility and
RHL Operations of 2.4 when determining cycle life during RHL or
Utility service until 4,000 hours or 9,900 cycles, whichever occurs
first (T able I).
(b) Stage 1 compressor disk P/N 5001T20P01 with 2,000 hours in RHL
operations and 1,000 hours and 800 accumulated cycles in Non-RHL
service:
1 Calculated total cycles result is determined as follows:
a Calculated Cycles in RHL Operations = 2,000 (RHL hours) X
2.4 (Multiplying Factor for Utility and RHL Operations) (Refer to
T able I) = 4,800 Calculated Cycles in RHL Operations.
b Calculated T otal Cycles = 800 (accumulated cycles) + 4,800
(Calculated Cycles in RHL Operations) = 5,600 Calculated T otal
Cycles.
2 Disposition:
Continue in service and apply a Multiplying Factor for Utility and
RHL Operations of 2.4 when determining cycle life during RHL or
Utility service. Remove the stage 1 compressor disk from service
at, or prior to reaching a life limit of 4,000 hours or 9,900 cycles,
whichever occurs first.
(c) Compressor spool P/N 6010T57G04 with 2,000 hours in RHL service
and 2,000 hours and 2,000 accumulated cycles in Non-RHL service:
1 Calculated T otal Cycles is determined as follows:
a Calculated cycles in RHL Operations = 2,000 (RHL hours) X
3.0 (Multiplying Factor for Utility and RHL Operations) = 6,000
Calculated Cycles in RHL Operations.
b Calculated T otal Cycles = 2,000 (accumulated cycles) + 6,000
(Calculated Cycles in RHL Operations) = 8,000 Calculated T otal
Cycles.
2 Disposition:
Continue in service and apply a Multiplying Factor for Utility and
RHL Operations of 3.0 when determining calculated total cycles
during RHL or Utility service. Remove the compressor spool from
service at, or prior to reaching a life limit of 10,000 hours or 12,800
cycles, whichever occurs first.
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
B. Perform the following on all installed and spare stage 1 and stage 2 turbine wheels
l i s t e di nT a b l eI V :
(1) Determine the component part number and its total time in hours for each type
of operation (Non-RHL, Utility, RHL) on installed and spare parts and then
convert to the selected operation to determine the total equivalent hours:
(a) Perform Calculations for Turbine Wheel Conversion Factor for T able IV
as follows:
1 If a part has been in one type of operation, compare accumulated
hours in that operation to the hourly life limit in T able IV. Remove
parts from service that exceed life limits.
2 If a part has been in multiple types of operation, select a single
operation type for the part. Any one of the three operations can be
selected as there is no difference in impact on the life consumption.
Use the Turbine Wheel Conversion Factor (found in T able IV),
convert the hours of each operation type to the selected operation
type. Sum all the converted hours to obtain the total hours of the
selected operation.
3 Divide RHL and Utility converted hours by five to obtain the cycles
and Non-RHL converted hours by two to obtain the cycles.
(b) Compare total hours to the operational life limits for the part number in
T able IV. Remove parts from service that exceed life limits.
(2) Examples for determining expended life for stages 1 and 2 turbine wheels:
(a) Stage 1 turbine wheel P/N 4002T17P06 with 300 hours RHL and 500
hours Non-RHL:
1 If RHL is selected, sample calculations for the hours and cycles
for RHL:
a Convert Non-RHL to RHL (Turbine Wheel Conversion Factor
= 0.46):
0.46 x 500 = 230 hours
T otal converted hours = 230 + 500 = 730 hours
b Converted cycles = 730/5 = 132 cycles
2 If Utility is selected, sample calculations for hours and cycles for
Utility operation:
a Convert RHL to Utility (Turbine Wheel Conversion Factor = 1.07):
1.07 x 300 = 321 hours
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
b Convert Non-RHL to Utility (Turbine Wheel Conversion Factor
= 0.49):
0.49 x 500 = 245 hours
T otal Converted Hours = 321 + 245 = 566 hours
c Converted cycles = 566/5 = 112 cycles
3 If Non-RHL is selected, sample calculations for hours and cycles for
Non-RHL:
a Convert RHL to Non-RHL (Turbine Wheel Conversion Factor
= 2.17):
2.17 x 300 = 651 hours
T otal converted hours = 651 + 500 = 1,151 hours
b Converted cycles = 1,151/2 = 576 cycles
(b) Stage 2 turbine wheel P/N 4002T96P06 with 700 hours Utility and 400
hours RHL:
1 Hours and cycles for RHL:
a Convert Utility to RHL (Turbine Wheel Conversion Factor = 0.64):
0.64 x 700 = 448 hours
T otal Converted hours = 448 + 400 = 848 hours
b Converted cycles = 848/5 = 170 cycles
2 Hours and cycles for Utility:
a Convert RHL to Utility (Turbine Wheel Conversion Factor = 1.57):
1.57 x 400 = 628 hours
b T otal Converted Hours:
628 + 700 = 1,328 hours
c Converted cycles = 1,328/5 = 625 cycles
3 Hours and cycles for Non-RHL:
a Convert Utility to Non-RHL (Turbine Wheel Conversion Factor
= 1.52):
1.52 x 700 = 1,064 hours
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
b Convert RHL to Non-RHL (Turbine Wheel Conversion Factor
= 2.38):
2.38 x 400 = 952 hours
c T otal Converted Hours:
1,064 + 952 = 2,016 hours
d Converted cycles = 2,016/2 = 1,008 cycles
NOTE: Operators are encouraged to direct any questions concerning the
need to apply Multiplying Factor for Utility and RHL Operations or
use of Turbine Wheel Conversion Factor to:
CT58 Program Manager
GE Aviation
1000 Western Avenue
Lynn, MA 01910
U.S.A.
C. This Alert Service Bulletin supersedes the following Service Bulletins:
Service Bulletin Number Service Bulletin Title
CT58 S/B 72-A0124
(CEB-204)
Reduction of Life Limits on St age 2 Compressor Rotor Disk
Shaft.
CT58 S/B 72-A0125
(CEB-205)
Reduction of Life Limits for Stage 1 and Stage 2 Turbine
Wheels and Introduction of New Stage 1 and Stage 2 Turbine
Wheels.
CT58 S/B 72-A0132
(CEB-216)
Reduction of Life Limits on Stage 1 Disk, Front Disk Shaft,
Rear Shaft, and Rear Seal of the Compressor Rotor.
CT58 S/B 72-A0146
(CEB-240)
Reduction of Service Life Limits of Compressor Rear Shaft for
External Lift Operators Only.
D. Compressor Rotor Components (Figure 2)
T able I specifies the life limits for the compressor rotor components that are life
limited.
TABLE I - COMPRESSOR ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 2
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
Stage 1 Disk 1
3920T11P01 4,000 9,900 2.4
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
TABLE I - COMPRESSOR ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 2
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
3920T11P02 4,000 9,900 2.4
37D400032P101 1,000 2,000 2.4
37D400211P101 1,000 2,000 2.4
37D400218P101 4,000 9,900 2.4
37D400218P102 4,000 9,900 2.4
37D400359P101 4,000 9,900 2.4
37D400359P102 4,000 9,900 2.4
*5001T20P01 4,000 9,900 2.4
5001T20P02 4,000 9,900 2.4
5013T06P01 4,000 9,900 2.4
Front Disk Shaft 2
37E500153P101 2,500 6,000 1.6
37E500213P101 2,500 6,000 1.6
37E500153P101M 2,500 6,000 1.6
**37E500213P103
See S/B 72-0078 (CEB-136)
2,500 6,000 1.6
5005T34P01 6,100 8,500 1.6
*5005T34P03 6,100 8,500 1.6
**5008T79P01 3,000 6,000 1.6
**5008T79P02 6,100 8,500 1.6
595E919P101 1,000 2,700 1.6
Spool 3
102R656P010 4,000 8,000 6.0
102R656P010CEB-147 # 10,000 20,000 6.0
37R600015P105 4,000 8,000 6.0
**37R600108G001 4,000 8,000 6.0
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
TABLE I - COMPRESSOR ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 2
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
**37R600108G001CEB-147 # 10,000 20,000 6.0
**37R600108G002 4,000 8,000 6.0
**37R600108G002CEB-147 # 10,000 20,000 6.0
**37R600152G001 4,000 8,000 6.0
**37R600152G001CEB-147 # 10,000 26,000 6.0
*37R600152G002 4,000 8,000 6.0
*37R600152G002CEB-147 # 10,000 26,000 6.0
4014T18P02 4,000 8,000 6.0
**4014T18G01 4,000 8,000 6.0
4014T18P03 4,000 8,000 6.0
4014T18P02CEB-147 10,000 20,000 6.0
*5124T94G02 10,000 12,800 3.0
Refer to paragraph
1.D., C ompliance.
5920T13P03 # 10,000 20,000 6.0
5920T13P12 10,000 20,000 6.0
5920T13P13 10,000 20,000 6.0
**5920T13P23 10,000 26,000 6.0
5920T13P25 10,000 26,000 6.0
*5920T13P26 10,000 26,000 6.0
*5920T13P28 10,000 26,000 6.0
5920T13P33 10,000 20,000 6.0
5920T13P34 10,000 20,000 6.0
**5920T13P35 10,000 20,000 6.0
**5920T13P36 10,000 20,000 6.0
**5920T13P41 # 10,000 26,000 6.0
*5920T13P42 # 10,000 26,000 6.0
**5920T13P43 # 10,000 20,000 6.0
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
TABLE I - COMPRESSOR ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 2
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
**5920T13P44 # 10,000 20,000 6.0
*5920T82G07 10,000 26,000 6.0
Refer to paragraph
1.D., C ompliance.
6002T75G01 4,000 8,000 6.0
6002T75G01CEB-147 # 10,000 20,000 6.0
6006T44G01 4,000 8,000 6.0
6010T57G01 4,000 8,000 6.0
6010T57G01CEB-147 10,000 26,000 6.0
*6010T57G02 4,000 8,000 6.0
*6010T57G02CEB-147 10,000 26,000 6.0
6010T57G03 10,000 26,000 6.0
*6010T57G04 10,000 12,800 3.0
Refer to paragraph
1.D., C ompliance.
6010T57G05 4,000 8,000 6.0
6010T57G05CEB-147 10,000 26,000 6.0
*6010T57G06 4,000 8,000 6.0
*6010T57G06CEB-147 10,000 26,000 6.0
6010T57G07 10,000 12,800 3.0
Refer to paragraph
1.D., C ompliance.
*6010T57G08 10,000 12,800 3.0
Refer to paragraph
1.D., C ompliance.
Rear Shaft 4
4000T29P01 6,100 9,600 3.2
*4000T29P03 6,100 9,600 3.2
4004T42P01 7,500 15,000 3.2
**4010T54P01 6,100 9,600 3.2
July 09, 1979 CT58 S/B 72-A0162
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ENGINE - Service Life Limits for Rotating Parts
TABLE I - COMPRESSOR ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 2
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
*5013T86P03 6,100 9,600 3.2
*5016T95P01 9,000 9,600 3.2
*5016T95P04 9,000 9,600 3.2
573D357P001 7,500 15,000 3.2
573D384P003 6,100 9,600 3.2
*5016T95P06 9,000 16,500 3.2
Rear Seal 5
37C300095P101 7,500 15,000 3.2
37C300095P102 7,500 15,000 3.2
37D400061P101 6,100 9,600 3.2
*37D400061P102 6,100 9,600 3.2
*4017T37P02 6,500 11,500 3.2
NOTES:
* Indicates part number is applicable to b oth CT58-140-1/2 and CT58-140-A/L models.
** Indicates part number is applicable to only CT58-140-A/L models converted from CT58-110-1
or CT58-110-2 models.
# Indicates compressor spool needs to include locking blade anti-rotation slot rework per CID
5362 to obtain extended life.
E. Turbine Rotor Components (Figure 3)
T able II specifies the life limits for the turbine rotor components that are life limited.
See T able IV for limits on stage 1 (P/N 4002T17P02 TF3 and P/N 4002T17P06) and
stage 2 (P/N 4002T96P02 TF3 and P/N 4002T96P06) turbine wheels.
TABLE II - TURBINE ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 3
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
Front Shaft 6
July 09, 1979 CT58 S/B 72-A0162
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### Page 16

ENGINE - Service Life Limits for Rotating Parts
TABLE II - TURBINE ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 3
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
*5003T35P01 10,000 40,000 4.0
573D358P002 10,000 40,000 4.0
*5126T00P01 10,000 40,000 4.0
Stage 1 Turbine Wheel 7
Refer to S/B 72-A0126 (CEB-206), Rev. 3, for stage 1 turbine wheel life limits and disposition of
turbine wheels.
278D987P002 S/B
72-A0126
O u to fS e r v i c e
**3018T97P02 S/B
72-A0126
O u to fS e r v i c e
3018T97P03 S/B
72-A0126
O u to fS e r v i c e
3018T97P04 S/B
72-A0126
O u to fS e r v i c e
37D400010P101 S/B
72-A0126
O u to fS e r v i c e
**37D400227P101 S/B
72-A0126
O u to fS e r v i c e
**37D400307P101 S/B
72-A0126
O u to fS e r v i c e
37D400498P101 S/B
72-A0126
O u to fS e r v i c e
*4002T17P01 S/B
72-A0126
--
*4002T17P02 S/B
72-A0126
--
*4002T17P04 S/B
72-A0126
--
Coupling Shaft 8
278D987P002 10,000 40,000 1.5
*4001T26P01 8,100 11,500 1.5
July 09, 1979 CT58 S/B 72-A0162
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### Page 17

ENGINE - Service Life Limits for Rotating Parts
TABLE II - TURBINE ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 3
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
*5126T23P01 8,100 11,500 1.5
Stage 2 Turbine Wheel 9
Refer to S/B 72-A0126 (CEB-206), Rev. 3, for turb ine wheel life limits and disposition of turbine
wheels.
278D979P002 S/B
72-A0126
O u to fS e r v i c e
**3018T98P01 S/B
72-A0126
O u to fS e r v i c e
3018T98P02 S/B
72-A0126
O u to fS e r v i c e
3018T98P03 S/B
72-A0126
O u to fS e r v i c e
3018T98P04 S/B
72-A0126
O u to fS e r v i c e
**37D400004P102 S/B
72-A0126
O u to fS e r v i c e
**37D400228P102 S/B
72-A0126
O u to fS e r v i c e
37D400499P101 S/B
72-A0126
O u to fS e r v i c e
*4002T96P01 S/B
72-A0126
--
*4002T96P02 S/B
72-A0126
--
*4002T96P04 S/B
72-A0126
--
Rear Shaft 10
37D400244P101 10,000 40,000 4.0
*4005T29P01 10,000 40,000 4.0
*5124T95P01 10,000 40,000 4.0
July 09, 1979 CT58 S/B 72-A0162
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### Page 18

ENGINE - Service Life Limits for Rotating Parts
TABLE II - TURBINE ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 3
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
Shaft Bolt 11
*4005T21P01 10,000 40,000 4.0
573D359P002 10,000 40,000 4.0
Cooling Plates
*37C300055P101 12 4,000 13,000 3.2
*5124T96P01 12 4,000 13,000 3.2
*3002T25P01 13 4,000 13,000 3.2
*5124T97P01 13 4,000 13,000 3.2
645C334P002 13 4,000 13,000 3.2
*3000T88P02 14 4,000 13,000 3.2
*5124T98P01 14 4,000 13,000 3.2
645C332P002 14 4,000 13,000 3.2
*3002T27P01 15 4,000 13,000 3.2
*5124T99P01 15 4,000 13,000 3.2
645C336P002 15 4,000 13,000 3.2
NOTES:
* Indicates part number is applicable to b oth CT58-140-1/2 and CT58-140-A/L models.
** Indicates part number is applicable to only CT58-140-A/L models converted from the
CT58-110-1 or CT58-110-2 models.
"Out of Service" is de fined as must be retired within 400 hours or by August 1, 1994, whichever
comes first.
F. Power Turbine Rotor Components (Figure 4)
T able III specifies the life limits for the power turbine rotor components that are
life limited.
July 09, 1979 CT58 S/B 72-A0162
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### Page 19

ENGINE - Service Life Limits for Rotating Parts
TABLE III - POWER TURBINE ROTOR COMPONENTS - LIFE LIMITS
Part Name and Part Number
Figure 4
Index No.
Life Limits
Hours Cycles
Multiplying Factor
for Repetitive
Heavy-Lift and Utility
Operations -
Hours to Cycles
Wheel and Shaft 16
37D400151P101 8,100 15,000 2.1
37D400151P102 8,100 15,000 2.1
**37D400229P103 8,100 15,000 2.1
4004T39P01 4,000 8,000 2.1
*5002T30P01 8,100 15,100 2.1
**5003T57P01 8,100 15,100 2.1
573D270P001 4,000 8,000 2.1
573D270P002 4,000 8,000 2.1
NOTES:
* Indicates part number is applicable to both the CT58-140-1/2 and CT58-140-A/L models.
** Indicates part number is applicable to only CT58-140-A/L models converted from the
CT58-110-1 or CT58-110-2 models.
G. Stage 1 and Stage 2 Turbine Wheels (Figure 3, items 7 and 9)
T able IV specifies the life limits for the stage 1 (P/N 4002T17P02 TF3 and P/N
4002T17P06) and stage 2 (P/N 4002T96P02 TF3 and P/N 4002T96P06) turbine
wheels.
TABLE IV - STAGE 1 AND STAGE 2 TURBINE WHEELS - LIFE LIMITS
Turbine Wheel Conversion Factor (Hours to Hours)
Part Name/
Part Number
Non-RHL
to
Utility
Non-RHL
to
RHL
Utility
to
RHL
Utility
to
Non-RHL
RHL
to
Non-RHL
RHL
to
Utility
Stage 1 Wheel
4002T17P02 TF3
OR
4002T17P06
0.49 0.46 0.94 2.03 2.17 1.07
July 09, 1979 CT58 S/B 72-A0162
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### Page 20

ENGINE - Service Life Limits for Rotating Parts
TABLE IV - STAGE 1 AND STAGE 2 TURBINE WHEELS - LIFE LIMITS
Stage 2 Wheel
4002T96P02 TF3
OR
4002T96P06
0.66 0.42 0.64 1.52 2.38 1.57
Conversion of Hours to Cycles
Part Name/
Part Number Non-RHL Utility RHL
Stage 1 Wheel
4002T17P02 TF3
OR
4002T17P06
T o convert hours to
cycles, divide by 2
T o convert hours to
cycles, divide by 5
T o convert hours to
cycles, divide by 5
Stage 2 Wheel
4002T96P02 TF3
OR
4002T96P06
T o convert hours to
cycles, divide by 2
T o convert hours to
cycles, divide by 5
T o convert hours to
cycles, divide by 5
Life Limits
Part Name/
Part Number Non-RHL Utility RHL
Stage 1 Wheel
4002T17P02 TF3
OR
4002T17P06
Hours
6,500
Cycles
3,250
Hours
3,200
Cycles
640
Hours
3,000
Cycles
600
Stage 2 Wheel
4002T96P02 TF3
OR
4002T96P06
Hours
10,000
Cycles
5,000
Hours
6,600
Cycles
1,320
Hours
4,200
Cycles
840
July 09, 1979 CT58 S/B 72-A0162
Revision 16, January 07, 2015 PAGE 20
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### Page 21 (OCR)

CT58
GE Aircraft Engines  ALERT SERVICE BULLETIN
ENGINE - Service Life Limits for Rotating Parts
FIGURE DELETED
99de0011
Deleted
Figure 1
July 09, 1979  Revision 16, January 07, 2015  CT58 S/B 72-A0162  PAGE 21
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### Page 22 (OCR)

CT58
GE Aircraft Engines
ALERT SERVICE BULLETIN
ENGINE - Service Life Limits for Rotating Parts
1229075-00
Compressor Rotor Components
Figure 2
July 09, 1979  CT58 S/B 72-A0162
Revision 16, January 07, 2015  PAGE 22
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### Page 23 (OCR)

CT58
GE Aircraft Engines
ALERT SERVICE BULLETIN
ENGINE - Service Life Limits for Rotating Parts
13
1229076-00
Turbine Rotor Components
Figure 3
July 09, 1979  CT58 S/B 72-A0162
Revision 16, January 07, 2015  PAGE 23
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### Page 24 (OCR)

CT58
GE Aircraft Engines
ALERT SERVICE BULLETIN
ENGINE - Service Life Limits for Rotating Parts
1229077-00
Power Turbine Rotor Components
Figure 4
July 09, 1979  CT58 S/B 72-A0162
Revision 16, January 07, 2015  PAGE 24
GE PROPRIETARY INFORMATION - Subject to the restrictions on the cover or first page.

### Page 25

ENGINE - Service Life Limits for Rotating Parts
4. APPENDIX A - FIELD MANAGEMENT PLAN
(1) Compressor spools P/N 5124T94G02, P/N 6010T57G04, P/N 6010T57G07, and
P/N 6010T57G08 may utilize the following Field Management Plan in order to
minimize the operational impact on their fleets.
(a) For compressor spools that have operated in RHL or Utility operations:
1 If the calculated CSN is less than 12,600 cycles, remove the compressor
spool from service before exceeding 12,800 CSN or 10,000 hours TSN.
2 If the calculated CSN is 12,600 or greater, remove the compressor spool
from service within 200 cycles from the effective date of the AD, but not
to exceed 13,000 CSN or 10,000 hours TSN.
(b) For compressor spools that have not operated in RHL or Utility operations:
1 If the total accumulated CSN is less than 10,800, remove the compressor
spool from service before exceeding 12,800 CSN or 10,000 hours TSN,
whichever occurs first.
2 If the total accumulated CSN is 10,800 or greater, and a shop visit occurs
before 12,800 CSN, remove the compressor spool from service before
exceeding 12,800 CSN but not to exceed 10,000 hours TSN.
3 If the total accumulated CSN is 10,800 or greater, and a shop visit does
not occur before 12,800 CSN, remove the compressor spool from service
at the next shop visit not to exceed 2,000 cycles from the effective date of
the AD or 10,000 hours TSN.
(c) Compressor spools beyond the life limit of 12,800 calculated total cycles must
be removed from service before September 30, 2019.
NOTE: The engine may not operate over the hourly life limit in any
circumstance.
(2) Utility operators may utilize the following Field Management Plan for the parts in
T able V in order to minimize the operational impact on their fleets.
TABLE V - PARTS INCORPORATED IN THE UTILITY OPERATORS FIELD
MANAGEMENT PLAN
Part Description and Life
Information Part Numbers
Compressor Stage 1 Disk
4,000 hours / 9,900 cycles
Utility/RHL Factor = 2.4
37D400218P101
37D400218P102
37D400359P101
37D400359P102
3920T11P01
3920T11P02
5001T20P01
5001T20P02
5013T06P01
July 09, 1979 CT58 S/B 72-A0162
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### Page 26

ENGINE - Service Life Limits for Rotating Parts
TABLE V - PARTS INCORPORATED IN THE UTILITY OPERATORS FIELD
MANAGEMENT PLAN
Part Description and Life
Information Part Numbers
Front Disk Shaft
6,100 hours / 8,500 cycles
Utility/RHL Factor = 1.6
5005T34P01
5005T34P03
5008T79P02
Compressor Spool
10,000 hours / 26,000 cycles
Utility/RHL Factor = 6.0
37R600152G001CEB-147
37R600152G002CEB-147
5920T13P23
5920T13P25
5920T13P26
5920T13P28
5920T13P41
5920T13P42
5920T82G07
6010T57G01CEB-147
6010T57G02CEB-147
6010T57G03
6010T57G05CEB-147
6010T57G06CEB-147
Compressor Spool
10,000 hours / 12,800 cycles
Utility/RHL Factor = 3.0
5124T94G02
6010T57G04
6010T57G07
6010T57G08
Compressor Rear Shaft
9,000 hours / 9,600 cycles
Utility/RHL Factor = 3.2
5016T95P01
5016T95P04
Compressor Rear Shaft
9,000 hours / 16,500 cycles
Utility/RHL Factor = 3.2
5016T95P06
Compressor Rear Seal
6,100 hours / 9,600 cycles
Utility/RHL Factor = 3.2
37D400061P101
37D400061P102
Compressor Rear Seal
6,500 hours / 11,500 cycles
Utility/RHL Factor = 3.2
4017T37P02
Turbine Front Shaft
10,000 hours / 40,000 cycles
Utility/RHL Factor = 4.0
5003T35P01
5126T00P01
573D358P002
Coupling Shaft
8,100 hours / 11,500 cycles
Utility/RHL Factor = 1.5
4001T26P01
5126T23P01
Turbine Rear Shaft
10,000 hours / 40,000 cycles
Utility/RHL Factor = 4.0
37D400244P101
4005T29P01
5124T95P01
July 09, 1979 CT58 S/B 72-A0162
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### Page 27

ENGINE - Service Life Limits for Rotating Parts
TABLE V - PARTS INCORPORATED IN THE UTILITY OPERATORS FIELD
MANAGEMENT PLAN
Part Description and Life
Information Part Numbers
Cooling Plates
4,000 hours / 13,000 cycles
Utility/RHL Factor = 3.2
3000T88P02
3002T25P01
3002T27P01
37C300055P101
5124T96P01
5124T97P01
5124T98P01
5124T99P01
645C332P002
645C334P002
645C336P002
Power Turbine Wheel and
Shaft
8,100 hours / 15,100 cycles
Utility/RHL Factor = 2.1
37D400151P101
37D400151P102
37D400229P103
5002T30P01
5003T57P01
(3) For life-limited parts that have not operated in Utility operation, remove the parts
from service before they exceed their cycl ic or hourly life limit, whichever occurs
first.
(4) For life-limited rotating parts that have operated in Utility operations, remove the
parts from service as follows:
(a) If the calculated CSN is less than 95 percent of the cyclic life limit, remove
the part from service before exceeding the cyclic or the hourly life limit,
whichever occurs first.
(b) If the calculated CSN is 95 percent of the cyclic life limit or greater and a
shop visit occurs before 100 percent of the cyclic life limit, remove the part
from service before exceeding the cyc lic or the hourly life limit, whichever
occurs first.
(c) If the calculated CSN is 95 percent of the cyclic life limit or greater and a shop
visit does not occur before 100 percent of the cyclic life limit, remove the part
from service before accumulating an additional five percent of the cyclic life
limit, but not to exceed the hourly life limit.
(5) This Field Management Plan applies up to September 30, 2019, after which all
life-limited parts exceeding their publis hed life limits must be removed and replaced.
NOTE: The engine may not operate over the hourly life limit in any circumstance.
July 09, 1979 CT58 S/B 72-A0162
Revision 16, January 07, 2015 PAGE 27
GE PROP RIETARY INFORMATION - Subject to the restrictions on the cover or first page.

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