747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-1747-8/8FCERTIFICATION MAINTENANCE REQUIREMENTS (CMRs)D011U721-02-03DECEMBER 2013This document has EAR data with an Export Control Classification Number (ECCN) of 9E991.Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15 CFR 730-774). An export license may be required before it is used fordevelopment, production or use by foreign persons from specific countries. The controller of this data has the individual responsibility to abide by all export laws.Boeing claims copyright in each page of thisdocument on to the extent that the pagecontains copyrightable subject matter. Boeing also claims copyright in this document as a compilation and/or collectivework. This document includes proprietary information owned by the Boeing Company and/or one or more third parties. Treatment ofthe document and the information it contains is governed by contract withBoeing. For more information, contact the Boeing Company, P.O.Box 3707, Seattle WA 98124. Boeing, the Boeing signature, the Boeing symbol, 707, 717, 727, 737, 747, 757, 767, 777, 787, BBJ, DC-8,DC-9, DC-10, MD-10, MD-11, MD-80, MD-88, MD-90, and the red-white-blue Boeing livery are all trademarks owned by The Boeing Company; no trademark license is granted in connection with thisdocument unless provided in writing by Boeing.COMPILED AND PUBLISHED BY:MAINTENANCE PROGRAMS ENGINEERINGCOMMERCIAL AVIATION SERVICESBOEING COMMERCIAL AIRPLANE GROUPSEATTLE, WASHINGTONDEC 2013D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-2747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSTHIS PAGE INTENTIONALLY LEFT BLANKBLANK747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-3TABLE OF CONTENTSREVISIONS .................................................................................................................................................................................................................................. 1.0-5LIST OF EFFECTIVE PAGES ...................................................................................................................................................................................................... 1.0-7A. SCOPE..................................................................................................................................................................................................................................... 1.0-9B. EXCEPTIONAL SHORT-TERM EXTENSIONS ....................................................................................................................................................................... 1.0-9C. POST-CERTIFICATION CHANGES ...................................................................................................................................................................................... 1.0-10D. CERTIFICATION MAINTENANCE REQUIREMENTS............................................................................................................................................................1.0-11E. CERTIFICATION MAINTENANCE REQUIREMENTS REQUIRED BYAIRWORTHINESS DIRECTIVES ........................................................................... 1.0-13F. CERTIFICATION MAINTENANCE REQUIREMENTS REQUIRED BY OTHER SAFETY ANALYSIS USED FOR CERTIFCATION .................................... 1.0-13G. CMR TASKS........................................................................................................................................................................................................................... 1.0-14APPENDIX A. SYSTEMS COMPONENTS LIFE-LIMITED ITEMS ............................................................................................................................................ 1.0-17AUG 2011D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-4747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSTHIS PAGE INTENTIONALLY LEFT BLANKBLANK747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-5REVISIONSREVISION AND REVISIONDESCRIPTIONAPPROVALAUGUST 2011Original Release.Submitted by: Kevin Perry (Boeing) Approved by: Robert D. Breneman(Seattle FAA ACO)SIGNATURE ON FILE8/12/2011AUGUST 2011 R1Added a new CMR to check for outboard aileron inboard actuator failures (27-CMR-09).Submitted by: Kevin Perry (Boeing) Approved by: Ron Landes forRobert D. Breneman(Seattle FAA ACO)SIGNATURE ON FILE8/16/2011SEPTEMBER 2011Revised the last paragraph in Section C by revising “747-8I” to “747-8” to include all 747-8passenger model airplanes.Revised Appendix A by revising the systems lifelimited part applicability from “747-8I” to“747-8” to include all 747-8 passenger model airplanes.Submitted by: Kevin Perry (Boeing) Approved by: Gary Oltman(Seattle FAA ACO)SIGNATURE ON FILE12/06/2011DECEMBER 2011Revised airplane applicability for 27-CMR-09.Submitted by: Kevin Perry (Boeing) Approved by: Angelos Xidias(Seattle FAA ACO)SIGNATURE ON FILE2/08/2012DEC 2013D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-6747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSMAY 2012Revised airplane applicability for 27-CMR-08 from "ALL" to "Applicable to 747-8 airplanesprior to line number 1462 and those airplanes that have not incorporated Service Bulletin747-27-2501."Submitted by: Paul Beuter (Boeing) Approved by: Doug Tsuji forAngelos Xidias(Seattle FAA BASOO)SIGNATURE ON FILE6/13/2012AUGUST 2013Added two new Certification Maintenance Requirement Tasks:27-CMR-10 – Lubricate inboard elevator hinge bearings.27-CMR-11 – Functional check of inboard elevator hinge bearing and power control unitrod end bearing play.Submitted by: Matthew Razniewski(Boeing)SIGNATURE ON FILEFAA BASOO11/01/2013DECEMBER 2013Revised 24-CMR-01 interval from "24 HRS" to "100 FH" and removed Interval Note inaccordance with the approved 747-8/-8F Electrical Power System Safety AssessmentDocument.Submitted by: Matthew Razniewski(Boeing)SIGNATURE ON FILEFAA BASOO12/20/2013REVISIONSREVISION AND REVISIONDESCRIPTIONAPPROVALDEC 2013Section Page Date Section Page Date Section Page Date Section Page Date Section Page DateD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-7LIST OF EFFECTIVE PAGES747-8/8F CERTIFICATIONMAINTENANCEREQUIREMENTS1.0 1 DEC 20131.0 2 BLANK1.0 3 AUG 20111.0 4 BLANK1.0 5 DEC 20131.0 6 DEC 20131.0 7 DEC 20131.0 8 BLANK1.0 9 AUG 20111.0 10 SEP 20111.0 11 AUG 20111.0 12 AUG 20111.0 13 AUG 20111.0 14 DEC 20131.0 15 MAY 20121.0 16 AUG 20131.0 17 SEP 20111.0 18 BLANKDEC 2013D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-8747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSTHIS PAGE INTENTIONALLY LEFT BLANKBLANK747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-9A. SCOPEThe 747-8/8F scheduled maintenance requirements described in thisdocument result from airplanecertification activities with the U.S. Federal AviationAdministration (FAA), and this FAA approved Certification Maintenance Requirements (CMR) document is cross-referenced in the Model 747 TypeCertificate Data Sheet A20WE as an Airworthiness Limitations Section of the Instructions for Continued Airworthiness. These scheduled maintenancerequirements may only be revised by the Seattle FAA Aircraft Certification Office (ACO); principal airworthiness inspectors (local regulatory authorities) maynot change these requirements or the intervals associated with these requirements without FAA ACO approval.B. EXCEPTIONAL SHORT-TERM EXTENSIONSIntervals for these CMRs are based on statistical averages and reliability rates except for 27-CMR-06, 27-CMR-07, and Life-limited Items 2 and 3 inAppendix A. An exceptional short-term extension of 10% for CMRs based on statistical averagesand reliability rates may be made without jeopardizingsafety. The local regulatory authority must concur with any exceptional short-term extensions before they take place using procedures established with thelocal regulatory authority in the operators' manuals. The "exceptional short-term extension" process is applicable to CMR intervals. It should not beconfused with the operator's "short-term escalation" program fornormal maintenance tasks described in the operators' continuous airworthinessmaintenance program.The Seattle FAA ACO has accepted that these exceptional short-term extensions may be granted without consultation with that office:1. The term "exceptional short-term extension" is defined as an increase in a CMR interval that may be needed to cover an uncontrollable or unexpectedsituation. CMRs based on statistical averages and reliability rates have been approved for an exceptional short-term extensionof 10%.2. Repeated use of extensions, either on the same airplane or onsimilar airplanes in an operator's fleet, should not be used asa substitute for goodmanagement practices. Exceptional short-term extensions must not be used for fleet CMR extensions.After a CMR has experienced an exceptional short-term extension,the CMR interval will revert backto its interval listed in this document. The Seattle FAAACO must approve, prior to its use, any desired extension not explicitly listed above.The exceptional short-term extension listedabove applies to airlines that fall under the United States FAA jurisdiction only.Operators who are not underU.S. FAA jurisdiction should obtain interval extension approvals from their local regulatory agency.AUG 2011D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-10747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSC. POST-CERTIFICATION CHANGESAny post-certification changes to CMRsmust be approved by the Seattle FAA ACO.1. Since the purpose of a CMR is to limit the exposure time to agiven significant latent failure as part of an engineering analysis of overall system reliability,instances of a CMR task repeatedly finding that no failure hasoccurred may not be sufficient justification for deleting the task.2. The introduction of a new CMR should be reviewed by the sameprocess used during initial certification. It is important thatoperators be afforded thesame opportunity to participate that they received during theoriginal certificationof the airplane, in order to allow the operators to manage their ownmaintenance programs.3. In the event that later data provide sufficient basis for relaxation of a CMR (less restrictive actions to be required), thechange may be documented by anFAA ACO approved change to this CMR document.4. If the requirements of an existing CMR must be decreased (more restrictiveactions to be performed), it will be implemented by a change to this CMRdocument and enforced by an FAA Airworthiness Directive (AD).5. After initial aircraft certification, the only basis for addinga new CMR is in association with the certification of designchanges.6. A new CMR created as part of a design change should be partof the approved data for that change and added to this CMR document.In the event that a CMR is revised for all 747-8 and 747-8F airplanes, Boeing will documentit by preparing a revision to thisdocument that will be approvedby the Seattle FAA ACO. This revisionwill then be forwardedto all 747-8/8F operators and the Seattle FAA ACO offices.SEP 2011747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-11D. CERTIFICATION MAINTENANCE REQUIREMENTSSELECTION OF CMRsIn order to grant operators of the 747-8/8F airplane an opportunity to participate in the evaluation and selection of CMRs in an integrated process with MRBtasks and intervals, a Certification Maintenance Coordination Committee (CMCC) wasconvened to review all of the 747-8/8F CMRs.The CMRs listed inthis document are the result of applying the CMCC process as described in AC 25-19.CMR DEFINITIONAs defined by AC 25-19, a CMR is a required periodic task, established during the design certification of the airplane as an operating limitation of the typecertificate. CMRs usually result froma formal, numerical analysis conducted to show compliance with catastrophic and hazardous failure conditions.Additional notes concerning the definition of CMRs:1. A CMR is intended to detect safety-significant latent (hidden) failures that would, in combination with one or more specificfailures or events, result in ahazardous or catastrophic failure condition.2. It is important to note that CMRs are derived from a fundamentally different analysis process than the maintenance tasks andintervals thatresult fromthe Maintenance Steering Group (MSG-3) Analysis associated withMaintenance Review Board (MRB) activities. MSG-3 Analysis activity producesmaintenance tasks that are performed for safety, operational, or economic reasons, involving both preventative maintenance tasks, which are performedbefore failure occurs (and are intended to prevent failures), aswell as failure-finding tasks. CMRs, on the other hand, are failure-finding tasks only, andexist solely to limit the exposure to otherwise hidden failures. Although CMR tasks are failure-finding tasks, use of potentialfailure-finding tasks, such asfunctional checks and inspections, may also be appropriate.3. CMRs are designed to verify that a certain failure has or has not occurred, and normally do not provide any preventative maintenance function. CMRs"restart the failure clock to zero" for latent failures by verifying that the item has not failed,or cause repair if it has failed. Because the exposure time to alatent failure is a key element in the calculations used in asafety analysis performed to show compliance with 14 CFR 25.1309,limiting the exposuretime will have a significant effect on the resultant overall failure probability of the system. The CMR task interval should bedesignated in terms of flighthours, cycles, or calendar time, as appropriate.AUG 2011D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-12747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTS4. The type certification process assumes that the airplanewill be maintained in a conditionof airworthiness at least equal toits certified or properly alteredcondition. The process described in AC 25-19 is not intended toestablish normal maintenance tasks that should be defined through the MSG-3 analysisprocess. Also, this process is not intended to establish CMRs for the purpose of providing supplemental margins of safety for concerns arisinglate in thetype design approval process.CMR TASK TYPESCMR Tasks are divided into two categories: One Star (*) CMRs and Two Star (**) CMRs. They are defined as follows:1. One Star (*) CMRs - The tasks and intervals specified are mandatory and cannot be changed, escalated, or deleted without theconcurrence of theSeattle FAA ACO.2. Two Star (**) CMRs - Task intervals may be adjusted in accordance with each operator's approved escalation program or an approved reliabilityprogram in a like manner for any MRB Report task, but may not be deleted without prior Seattle FAA ACO approval.ESCALATION OF TWO STAR (**) CMRsAll Two Star (**) CMRs can be managed and controlled the same asany MRB Report task; however, they can not be deleted from anoperator's programwithout prior Seattle FAA ACO approval. For operatorswith approved escalation practices oran approved reliability program, data collection and analyticaltechniques are used to make adjustments to an operator's maintenance program. It has been demonstrated that the management of amaintenanceprogram does not give rise to undue escalations; consequently,the escalation of Two Star (**)CMR intervals within an operator's maintenance program willbe properly managed by the operator subject to local regulatory authority approvalAUG 2011747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-13E. CERTIFICATION MAINTENANCE REQUIREMENTS REQUIRED BY AIRWORTHINESS DIRECTIVESCMRs 27-CMR-06, 27-CMR-07, and Life-limited Items 2 and 3 in Appendix A are required by existing Airworthiness Directives (ADs)required under 14 CFR39 and do not come from system safety analysis required under 14CFR 25.1309. CMR 27-CMR-06 is required by AD 2006-10-02. CMR27-CMR-07 is anFAA ACO approved Alternate Method of Compliance (AMOC) for AD 2003-11-01. Life-limited Items 2 and 3 in Appendix A are required by AD 2009-22-08.Since CMRs 27-CMR-06, 27-CMR-07, and Life-limited Items 2 and 3in Appendix A are required by existing ADs required under 14 CFR 39, requests for anAMOC or a change in the compliance times for these items should be in accordance with 14 CFR 39.F. CERTIFICATION MAINTENANCE REQUIREMENTS REQUIREDBY OTHER SAFETY ANALYSIS USED FOR CERTIFCATIONLife-limited Item 1 in Appendix A is required by safety analysis used to certify the flight deck door. The flight deck door strike assembly life limit assuresminimum system performance requirements in the event of a cabin decompression event (Reference FAA memorandum01-115-11 dated Nov. 6, 2001revised Dec. 3, 2002).AUG 2011D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-14747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSG. CMR TASKSCMRITEMNUMBER TYPERELATEDMRB REPORTITEM NUMBER CMR INTERVALAPPLICABILITYTASK DESCRIPTIONAPL ENG21-CMR-01*21-058-1512,000 FHALLALLOperational test of E&E cooling system override mode function.21-CMR-02*21-058-03(MPD Number)2,000 FHALLALLSystem test – E30 rack pressure at E&E cooling system E30-2 Shelf (equipment coolingsystem).24-CMR-01*24-029-03(MPD Number)100 FHALLALLOperational (short) test – 115 voltAC standby power generation system.24-CMR-02*24-023-00(MPD Number)500 FHALLALLOperational test – generatorcontrol units and bus control units (power-up test).26-CMR-01*26-011-0024 HRSNOTEALLALLOperational test for engine and APU fire/overheat detection system (if not checked by crew).INTERVAL NOTE: Under exceptional operational circumstances the interval may beextended beyond 24 hours (elapsed clock hours) but not exceed 48 hours (elapsedclock hours).27-CMR-01*27-051-201,200 FHALLALLOperational check of the primary electrical leading and trailing edge flap system.27-CMR-02*27-051-1010,000 FHALLALLOperational check of the alternate electricalleading and trailing edge flap system controlswitch.27-CMR-03*27-051-12(MPD Number)1,200 FHALLALLOperational check of the alternate electricalleading and trailing edge flap system armswitch.DEC 2013747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-1527-CMR-04*27-021-456,250 FHALLALLTest upper rudder hinge bearing and rudder power control package bearing play.27-CMR-05*27-021-406,250 FHALLALLTest lower rudder tab hinge bearing and rudder control rod bearing play.27-CMR-06*27-041-1012-027-3427-041-0521,000 FHI-15,000 FH / 18 MOR- 2,000 FH / 12 MOI-15,000 FH / 18 MOR- 4,000 FH / 24 MOALLALLTest horizontal stabilizer trimsystem ballnut-to-ballscrew freeplay.Lubricate horizontal stabilizer trim system ballnut and ballscrew.Inspect horizontal stabilizer trim system ballnut and ballscrew.27-CMR-07*51-041-01(MPD Number)51-041-02(MPD Number)51-041-03(MPD Number)51-041-04(MPD Number)2 YR2 YR3 YR6 YRALLALLOperational check of the canted pressure deckexterior drain lines in the main landing gearwheel wells by purging the drain lines with compressed air to ensure there are noblockages.Inspect and restore (clean) the interior of the wing center section canted pressure deck byremoving all debris that could contaminate andobstruct water drain paths, water draininlets, water scavenge tube inlets, or water drain catch basins.Inspect the canted pressure deck exterior surface from inside the main landing gear wheelwells to detect unintended water leakage paths.Inspect the canted pressure deck exterior surface from inside the main landing gear wheelwells with the fuselage pressurized to detect air leakage paths.27-CMR-08*27-011-05(MPD Number)11,000 FHNOTEALLFunctional check of the inboard aileron power control unit compensator.AIRPLANE NOTE: Applicable to 747-8 airplanes prior to line number 1462 and thoseairplanes that have not incorporated Service Bulletin 747-27-2501.CMRITEMNUMBER TYPERELATEDMRB REPORTITEM NUMBER CMR INTERVALAPPLICABILITYTASK DESCRIPTIONAPL ENGMAY 2012D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-16747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTS27-CMR-09*27-011-07(MPD Number)24 HRSNOTENOTEALLVisually check the Flight Controls Maintenance Page on EICAS for the presence of an "x"adjacent to the outboard aileron inboard actuator position indication, and follow the faultisolation procedure for the "L/R AIL ACTUATOR" status message if an "x" is present.INTERVAL NOTE: Under exceptional operational circumstances the interval may beextended beyond 24 hours (elapsed clock hours) but not exceed 48 hours (elapsed clockhours).AIRPLANE NOTE: 747-8F airplanes prior to line number 1450 that have not incorporatedService Bulletin 747-31-2455 R00.27-CMR-10*12-027-33(MPD Number)5,000 FH / 18 MONOTEALLALLLubricate inboard elevator hinge bearings.INTERVAL NOTE: Whichever occurs first.27-CMR-11*27-031-10(MPD Number)6,250 FH / 18 MONOTEALLALLFunctional check of inboard elevator hinge bearing and power control unit rod end bearingfree play.INTERVAL NOTE: Whichever occurs first.29-CMR-01*29-021-0011,000 FH / 30 MOALLALLFunctional check of the ram air turbine system, including gross internal leakage check ofthe ram air turbine hydraulic system.CMRITEMNUMBER TYPERELATEDMRB REPORTITEM NUMBER CMR INTERVALAPPLICABILITYTASK DESCRIPTIONAPL ENGAUG 2013747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSD011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-17APPENDIX A. SYSTEMS COMPONENTS LIFE-LIMITED ITEMSThe replacement times established for life-limited parts in this appendixresult from Model 747-8/8F airplane certification activities with the U.S. FAA and arepart of the Airworthiness Limitations Section of the Instructionsfor Continued Airworthiness.These maintenance actions are mandatory. These life limitsmay only be revised with the approval of the Seattle FAA ACO.ITEMNUMBER LIFE-LIMITED ITEMPARTNUMBER PART DESCRIPTIONAPPLICABILITYSPECIFICATIONS LIFE LIMITQUANTITY PERAIRPLANE1Double Roller E StrikeAR4704-6Flight Deck Door Strike AssemblyApplicable to 747-8Flight Deck Security Door9 Years12Switch284U7410-1Fwd and Aft Cargo Door Control SwitchApplicable to 747-8 and747-8F in the followinginstallation positions:Aft Cargo DoorForward Cargo Door6 Years23 Switch 284U7410-1 Nose Cargo Door Control Switch Applicable to 747-8F in thefollowing installationpositions:Nose Cargo Door6 Years1SEP 2011D011U721-02-03BOEING PROPRIETARY - Copyright (c) - Unpublished Work - See title page for details Page 1.0-18747-8/8F CERTIFICATION MAINTENANCE REQUIREMENTSTHIS PAGE INTENTIONALLY LEFT BLANKBLANK