AC 120-42B ETOPS and Polar Ops - Code7700

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AC 120-42B 6/13/08program and other pertinent requirements clearly indicating where all facets of the ETOPSmaintenance program are located in the certificate holder’s document system. All ETOPSrequirements, including supportive programs, procedures, duties, and responsibilities, must beidentified. The ETOPS document(s) must reflect the actual policies and procedures the certificateholder expects their ETOPS maintenance personnel to adhere to. The document(s) should be userfriendly, and be accessible to all affected personnel. The initial document must be submitted tothe CHDO and be approved before being adopted.c. ETOPS PRE-DEPARTURE SERVICE CHECK (PDSC).(1) The certificate holder must develop an ETOPS PDSC to verify that the airplane andcertain significant items are airworthy and ETOPS capable. Each certificate holder’s PDSC mayvary in form and content. The prerequisites for an acceptable PDSC are content and suitabilityfor the specific certificate holder’s needs.(2) All certificate holders must address ETOPS significant system airworthiness in theirETOPS maintenance program, including the PDSC. Specifically, the PDSC is a maintenancetask that should include an applicable maintenance records review and an interior and exteriorinspection. The PDSC is sometimes referred to as an expanded transit check inspection. ThePDSC should include visual inspections and procedures applicable to determining ETOPSSignificant Systems airworthiness status. The airworthiness status determination should include aprocess for determining engine and auxiliary power unit (APU) oil quantities, and consumptionrates prior to ETOPS dispatch.NOTE: Proper servicing of fluids, such as engine, APU, generator systems,and hydraulic systems is a vital ingredient to successful ETOPS operations.Some current ETOPS operators have had incidents resulting from improperfluid servicing, or not properly determining or addressing high consumptionrates. This has resulted in IFSDs and diversions. Certificate holders shouldconsider this area very seriously when developing their maintenance checks,including the PDSC.(3) Some certificate holders may elect to include tasks in the PDSC that are driven bytheir reliability programs and are not related to ETOPS significant systems. However, thecertificate holder must clearly identify the ETOPS related tasks on their PDSC if non-ETOPSqualified maintenance personnel are to accomplish the non-ETOPS tasks. An appropriatelytrained maintenance person, who is ETOPS qualified, and authorized by the certificate holder,must accomplish and certify by signature the completion of ETOPS specific tasks. Anappropriately trained person who is ETOPS qualified and authorized by the certificate holdermust certify by signature, that the ETOPS pre-departure service check has been completed.Appropriately trained persons are those that have satisfactorily completed the certificate holder’sETOPS training program. The signatory person that certifies the completion of the PDSC mustalso meet the following criteria:(a) Inside the United States, the signatory person holds a U.S. mechanic’scertificate with airframe and powerplant ratings, and works for an operator authorized to engagein part 121 operation, or works for a part 145 repair station.Page 14 Par 301
6/13/08 AC 120-42B(b) Outside the United States, the signatory person holds a U.S. mechanicscertificate with airframe and powerplant ratings, or holds a certificate in accordance with§ 43.17(c) (1) or,(c) Works for an ETOPS maintenance entity and has the requisite experience orspecific training needed to accomplish the task and is authorized to complete the PDSC andreturn the aircraft to service on behalf of the ETOPS maintenance entity; the signatory persondoes not have to hold a U.S. or Canadian certificate.NOTE: An ETOPS maintenance entity is an entity that has been authorized toperform ETOPS maintenance and authorized by the certificate holder tocomplete ETOPS pre-departure service checks. That entity is certificated toengage in part 121 operations; a repair station certificated under part 145, oran entity authorized pursuant to § 43.17(c)(2).(4) The PDSC must be certified complete immediately before each scheduled ETOPSflight. The term “immediately” has historically meant to be no more than 2 to 4 hours before theflight. However, the FAA may grant some relief from this time period under certain conditions.The certificate holder should explain any rational for such deviations in its ETOPS maintenancedocument, which is approved by its CHDO.(5) A PDSC may not be required before all ETOPS flights. The FAA may grant relieffollowing irregular operations because of non-mechanical issues, such as weather or medicalemergency diversions, or when operating ETOPS into specific areas of operation. For example,if an airplane scheduled for an ETOPS flight receives a PDSC before departure and subsequentlymust divert or turn back for reasons other than mechanical, the certificate holder must identify inits ETOPS maintenance document what procedures its flight operations and maintenancepersonnel would follow to preclude performing another PDSC. If a mechanical discrepancydevelops as a result of the diversion or turn back, the certificate holder may have to performanother PDSC. For example, when an overweight landing inspection reveals an ETOPSSignificant System discrepancy that requires maintenance intervention, another PDSC isrequired.(6) In areas where prevailing weather conditions are stable and generally do notapproach extremes in temperature, wind, ceiling, and visibility, such as in the Caribbean/WesternAtlantic (75-minute ETOPS) and Micronesia routes (90-minute ETOPS), the service check maynot be required for the return leg of an ETOPS flight. This check is not precluded by any othermaintenance check.d. Dual Maintenance.(1) ETOPS dual maintenance, otherwise referred to as identical maintenance, multiplemaintenance, and simultaneous maintenance, requires special consideration by the certificateholder. This is to recognize and preclude common cause human failure modes. Properverification processes or operational tests, prior to ETOPS, are required when dual maintenanceon significant systems occurs.Par 301 Page 15
Page 1 and 2: U.S. Departmentof TransportationFed
Page 3: 6/13/08 AC 120-42B605. FAA Polar Ar
Page 7 and 8: 6/13/08 AC 120-42BCHAPTER 2. BACKGR
Page 9 and 10: 6/13/08 AC 120-42B15 percent increa
Page 11 and 12: 6/13/08 AC 120-42Bd. Even though fo
Page 13 and 14: 6/13/08 AC 120-42Bminutes, the requ
Page 15 and 16: 6/13/08 AC 120-42Bdecisions success
Page 17: 6/13/08 AC 120-42BCHAPTER 3. REQUIR
Page 21 and 22: 6/13/08 AC 120-42B(7) The FAA ackno
Page 23 and 24: 6/13/08 AC 120-42B(2) In addition t
Page 25 and 26: 6/13/08 AC 120-42Bk. Engine Conditi
Page 27 and 28: 6/13/08 AC 120-42Bholder must imple
Page 29 and 30: 6/13/08 AC 120-42B(a) Cruise altitu
Page 31 and 32: 6/13/08 AC 120-42B1. ETOPS Up to 18
Page 33 and 34: 6/13/08 AC 120-42B(6) Fuel Supply.
Page 35 and 36: 6/13/08 AC 120-42Bflight crewmember
Page 37 and 38: 6/13/08 AC 120-42Bairport drops the
Page 39 and 40: 6/13/08 AC 120-42B• In-flight ver
Page 41 and 42: 6/13/08 AC 120-42BCHAPTER 4. APPLIC
Page 43 and 44: 6/13/08 AC 120-42B(1) 75-minute ETO
Page 45 and 46: 6/13/08 AC 120-42Brobust to protect
Page 47: 6/13/08 AC 120-42Bby another means
Page 50 and 51: AC 120-42B 6/13/08in ETOPS remain a
Page 52 and 53: AC 120-42B 6/13/08b. The certificat
Page 54 and 55: AC 120-42B 6/13/08(h) Training for
Page 56 and 57: AC 120-42B 6/13/8Appendix 19. ETOPS
Page 59 and 60: AC 120-42BAppendix 2APPENDIX 2. ETO
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6/13/08 AC 120-42BAppendix 3APPENDI
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6/13/08 AC 120-42BAppendix 3NOTE: P
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6/13/08 AC 120-42BAppendix 3(4) Def
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AC 120-42B ETOPS and Polar Ops - Code7700

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