TRANSMITTAL SHEET
CFM INTERNATIONAL
CFM56-7B SERVICE BULLETIN79-0001,REVISION10
OIL-GENERAL(79-00-00)-APPROVED OILS FOR CFM56-7B ENGINES
APRIL14,2014
This page transmits Revision10to CFM56-7B Service Bulletin79-0001dated September22,1997,Revision 1dated March17,1999,Revision2dated October13,2000,Revision3dated July05,2001,Revision4 dated August10,2001,Revision5dated June24,2003,Revision6dated July07,2006,Revision7dated July10,2008,Revision8dated May14,2009and Revision9dated August19,2011.
This Service Bulletin has been revised to update the approved oils and to correct the service requirements procedures.
Consequently,the following paragraphs have been updated:
-and to delete the notion to use the MJO254on
-the SER reference and to add the manufacturer's internal reference document
-to delete the oil Castrol5000,to update the mixability and interchangeability
and MJO254in the Table1in
-  3.REQUIREMENTS FOR OIL APPROVAL,to delete the reference to SER.
Engines that have previously complied with this Service Bulletin are not affected.
The vertical dash in the left-hand margin indicates change.A change,which does not affect the technical content,may not be highlighted in the Transmittal Sheet.
This Service Bulletin is reissued in its entirety.
CFM PROPRIETARY INFORMATION
The information contained in this document is CFM proprietary information and is disclosed in
confidence.It is the property of CFM and shall not be used,disclosed to others or reproduced
without the express written consent of CFM,including,but without limitation,it is not to be used in
the creation,manufacture,development,or derivation of any repairs,modifications,spare parts,
design,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.
The information contained in this document may also be controlled by port control laws.
Unauthorized export or re-export is prohibited.
All technical documentation and information contained herein,with respect to assembly and
disassembly,cleaning,inspection methods and limits,repair methods and limits,operational
limits,life limits and the like,have been developed and approved for use with engines and parts
that have been manufactured and/or approved by CFM and that have been maintained in
accordance with CFM technical documentation and recommendations.CFM has no contractual
or legal obligation for,nor knowledge of,non-CFM-approved parts and repairs.Accordingly,this
document is not intended to apply to non-CFM-approved parts and repairs.
September22,1997CFM56-7B S/B79-0001
Revision10,April14,2014PAGE1of13
1.PLANNING INFORMATION
A.Effectivity
CFM56-7B20,-7B20/2,-7B20/3,-7B20E
CFM56-7B22,-7B22/B1,-7B22/2,-7B22/3,-7B22/3B1,-7B22E,-7B22E/B1
CFM56-7B24,-7B24/2,-7B24/B1,-7B24/3,-7B24/3B1,-7B24E,-7B24E/B1
CFM56-7B26,-7B26/B1,-7B26/B2,-7B26/2,-7B26/3,-7B26/3B1,-7B26/3B2,-7B26/3F,
-7B26/3B2F,-7B26E,-7B26E/B1,-7B26E/B2,-7B26E/F,-7B26E/B2F
CFM56-7B27,-7B27/B1,-7B27/B3,-7B27/2,-7B27/3,-7B27/3B1,-7B27/3B3,-7B27/3F,
-7B27/3B1F,-7B27E,-7B27E/B1,-7B27E/B3,-7B27E/F,-7B27E/B1F
CFM56-7B27A,-7B27A/3,-7B27AE
B.Description
This Service Bulletin establishes the following:
(1)A listing of oils by brand name that have been approved for service.
(2)A listing of oils by brand name that have been approved for Service Evaluation.
(3)A listing of oils by brand name that have been approved for additional Revenue
Service Evaluation.
(4)An outline of the procedures required for evaluating a proposed oil so that it may be
listed as approved for service.
C.Compliance and Warranty
Category9.
Information only.
(1)It is recommended that this Service Bulletin be complied with all engines.
(2)Compliance with this Service Bulletin is a condition of Engine Warranty and
Material/Labor Cost Guarantees.Warranties and Material Cost Guarantees are
not jeopardized by use of Service Evaluation Lubricants provided they are used in
accordance with the instructions and requirements included in the applicable Service
editor evaluating revisionEvaluation Request and additional Service Evaluation Request.
September22,1997CFM56-7B S/B79-0001
Revision10,April14,2014PAGE2
NOTE:For customer using BP Turbo Oil2197(BP2197)or Mobil Jet Oil254(MJO254),
the following S/Bs must be applied:
CFM56-7B S/B72-0652
CFM56-7B S/B79-0027(applicable until implementation of S/B72-0652)
CFM56-7B S/B79-0024
D.Concurrent Requirements
None.
E.Reason
This Service Bulletin designates the lubricating oils which are approved for use in CFM56
engines listed in
F.Approval
The technical content of this document is approved by the FAA and under the authority of
DOA No.EASA.21J.086.
G.Manpower
No additional man-hour is necessary to do this Service Bulletin.
H.Weight and Balance
Weight and balance are not changed.
I.References
CFM56-7B Engine Shop Manual,CFMI-TP.SM.10.
Boeing737-600/-700/-800/-900Aircraft Maintenance Manual.
CFM56-7B S/B72-0652,ENGINE-Accessory Gearbox Assembly(72-63-00)-Introduction
of New Magnetic Seal and New Sealol Seal with New O-ring Material and Rework of Old
Magnetic Seal and Old Sealol Seal to the New One.
CFM56-7B S/B79-0027,OIL-General(79-00-00)-Oil Consumption Monitoring.
September22,1997CFM56-7B S/B79-0001
Revision10,April14,2014PAGE3

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