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 Department of Transportation Federal Aviation Administration 14 CFR Part 39
[Docket No. FAA-2023-1497; Project Identifier AD-2023-00516-T; Amendment 39-22816; AD 2024-16-10]
RIN 2120-AA64
 AGENCY: Federal Aviation Administration (FAA), DOT.
 ACTION: Final rule.
 SUMMARY: The FAA is superseding Airworthiness Directive (AD) 2019-25-17, which applied to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. AD 2019-25-17 required revising the existing airplane flight manual (AFM) to prohibit selection of certain runways for airplanes equipped with certain software. Since the FAA issued AD 2019-25-17, Boeing has developed new software to address the unsafe condition. This AD was prompted by reports of display electronic unit (DEU) software errors on airplanes with a selected instrument approach to a specific runway. This AD retains the requirements of AD 2019-25-17. This AD also requires installing the new software and performing a software configuration check, which terminates the AFM revision. The FAA is issuing this AD to address the unsafe condition on these products.
 DATES: This AD is effective October 28, 2024. The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD as of October 28, 2024.
 ADDRESSES:  *AD Docket:*
                         You may examine the AD docket at 
                        *regulations.gov*
                         under Docket No. FAA-2023-1497; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, Washington, DC 20590. *Material Incorporated by Reference:* For Boeing material identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110 SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website*myboeingfleet.com*.
                    You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. It is also available at*regulations.gov*
                         under Docket No. FAA-2023-1497.
 FOR FURTHER INFORMATION CONTACT: Douglas Y. Tsuji, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3548; email: 
                        *Douglas.Tsuji@faa.gov*.


SUPPLEMENTARY INFORMATION: Background The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2019-25-17, Amendment 39-21016 (84 FR 71304, December 27, 2019) (AD 2019-25-17). AD 2019-25-17 applied to all the Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER (Model 737 NG) series airplanes (although the scope of the AD requirements is limited to operation at specific runways in the U.S., Colombia, and Guyana). The NPRM published in the 
                    **Federal Register**
                     on August 4, 2023 (88 FR 51739). The NPRM was prompted by reports of Display Units (DUs) blanking due to Display Electronics Unit (DEU) software errors on Model 737 NG airplanes flying into runway PABR in Barrow, Alaska. The investigation revealed that the problem occurs when a certain combination of software is installed and a susceptible runway with a 270-degree true heading is selected for instrument approach, although only seven runways worldwide have latitude and longitude values that cause the blanking behavior. AD 2019-25-17 was issued to address the potential for blanking displays on flights into the affected airports. The software errors and consequent display blanking, if not addressed, could prevent continued safe flight and landing. In the NPRM, the FAA proposed to retain the requirements of AD 2019-25-17. The NPRM also proposed to require installing the new software, and performing a software configuration check, which would terminate the AFM revision requirement. The FAA is issuing this AD to address the potential for all six DUs to blank, which can prevent continued safe flight and landing. Discussion of Final Airworthiness Directive Comments The FAA received comments from the Air Line Pilots Association, International (ALPA), who supported the NPRM without change. The FAA received additional comments from three commenters, including Boeing, Southwest Airlines (SWA), and Pegasus Airlines. The following presents the comments received on the NPRM and the FAA's response to each comment. Request To Continue Utilizing Common Display System Block Point 06 Boeing requested that paragraph (m), “Alternative Methods of Compliance (AMOCs),” of the proposed AD be revised to allow airplanes with Common Display System (CDS) Block Point (BP) 06 an AMOC to the actions specified by paragraph (h) of the proposed AD. SWA requested allowing airplanes to continue to utilize CDS BP06 in lieu of the software update that would be required by paragraph (h) of the proposed AD (
                    *i.e.,*
                     CDS BP15a). Boeing and SWA stated that CDS BP06 does not contain the error that leads to the display blanking for the specific airports listed in AD 2019-25-17. SWA also cited a software incompatibility issue with the Rockwell Collins Head Up Display (HUD) HGS-2350 (currently installed on 15% of their fleet) and stated that the new CDS BP15a would require disabling the HUD, which provides the flightcrew a myriad of safety features enhancements. The FAA agrees with allowing airplanes with CDS BP06 to be excepted 
                    ( print page 77446)
                    from the requirements of paragraph (h) of this AD, because CDS BP06 does not contain the error that leads to the display blanking for the specific airports listed in AD 2019-25-17. The FAA has added a statement in paragraph (i)(2) of this AD accordingly. The FAA does not agree with revising paragraph (m) of this AD, because this AD has been revised to except airplanes with CDS BP06 from the requirements of paragraph (h) of this AD, thus eliminating the need for the AMOC. Request for Adding a Note to Paragraph (c), “Applicability” Pegasus Airlines requested adding a note to paragraph (c), “Applicability,” of the proposed AD as follows: “The scope of the AD requirements is limited to operation at the seven runways identified in figure 1 to paragraph (g) of this AD.” The commenter stated that the note was in AD 2019-25-17 and should be included in this AD. The FAA disagrees with the commenter. The requirements of this AD, notably the software update, must be done by all applicable airplanes regardless of runway operation. The FAA has not changed this AD in this regard. Effect of Winglets on Accomplishment of the Proposed Actions Aviation Partners Boeing stated that the installation of winglets per Supplemental Type Certificate STC ST00830SE does not affect the accomplishment of the manufacturer's service instructions. The FAA agrees with the commenter that STC ST00830SE does not affect the accomplishment of the manufacturer's service instructions. Therefore, the installation of STC ST00830SE does not affect the ability to accomplish the actions required by this AD. The FAA has not changed this AD in this regard. Conclusion The FAA reviewed the relevant data, considered any comments received, and determined that air safety requires adopting this AD as proposed. Accordingly, the FAA is issuing this AD to address the unsafe condition on these products. Except for minor editorial changes, and any other changes described previously, this AD is adopted as proposed in the NPRM. None of the changes will increase the economic burden on any operator. Material Incorporated by Reference Under 1 CFR Part 51 The FAA reviewed Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020. This material specifies procedures for installing the CDS DEU OPS block point 2015A and performing a software configuration check. This material is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the 
                    **ADDRESSES**
                     section. Costs of Compliance The FAA estimates that this AD affects 1,739 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD: Estimated Costs
Action
Labor cost
Parts cost
Cost per product
Cost on U.S. 
                             operatorsRevise AFM (retained action from AD 2019-25-17)
1 work-hour × $85 per hour = $85
$0
$85
$147,815.Install software and perform configuration check (new actions)
2 work-hours × $85 per hour = $170
Up to $975
Up to $1,145
Up to $1,991,155.
 Authority for This Rulemaking Title 49 of the United States Code specifies the FAA's authority to issue rules on aviation safety. Subtitle I, section 106, describes the authority of the FAA Administrator. Subtitle VII: Aviation Programs, describes in more detail the scope of the Agency's authority. The FAA is issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701: General requirements. Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD will not have a substantial direct effect on the States, on the relationship between the national government and the States, or on the distribution of power and responsibilities among the various levels of government. For the reasons discussed above, I certify that this AD: (1) Is not a “significant regulatory action” under Executive Order 12866, (2) Will not affect intrastate aviation in Alaska, and (3) Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. List of Subjects in 14 CFR Part 39 Air transportation
Aircraft
Aviation safety
Incorporation by reference
Safety
 The Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: PART 39—AIRWORTHINESS DIRECTIVES
 1.The authority citation for part 39 continues to read as follows: Authority:
                        49 U.S.C. 106(g), 40113, 44701. § 39.13
 2.The FAA amends § 39.13 by: a.Removing Airworthiness Directive (AD) 2019-25-17, Amendment 39-21016 ( 84 FR 71304, December 27, 2019); and b.Adding the following new AD: **2024-16-10 The Boeing Company:**
                             Amendment 39-22816; Docket No. FAA-2023-1497; Project Identifier AD-2023-00516-T. (a) Effective Date This airworthiness directive (AD) is effective October 28, 2024.
                            ( print page 77447) (b) Affected ADs This AD replaces AD 2019-25-17, Amendment 39-21016 (84 FR 71304, December 27, 2019) (AD 2019-25-17). (c) Applicability This AD applies to all The Boeing Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, certificated in any category. (d) Subject Air Transport Association (ATA) of America Code 31, Instruments. (e) Unsafe Condition This AD was prompted by reports of display electronic unit (DEU) software errors on airplanes with a selected instrument approach to a specific runway. The FAA is proposing this AD to address the potential for all six display units (DUs) to blank, which can prevent continued safe flight and landing. (f) Compliance Comply with this AD within the compliance times specified, unless already done. (g) Retained AFM Revision, with No Changes This paragraph restates the requirements of paragraph (g) of AD 2019-25-17, with no changes. Within 14 days after December 27, 2019 (the effective date of AD 2019-25-17), revise the Miscellaneous Limitations section of the existing airplane flight manual (AFM) to include the information in figure 1 to paragraph (g) of this AD. This may be done by inserting a copy of figure 1 to paragraph (g) of this AD into the Miscellaneous Limitations section of the existing AFM. Figure 1 to Paragraph (g)—AFM Revision  (h) Software Update Except as specified in paragraph (i) of this AD: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020. Note 1 to paragraph (h): Guidance for accomplishing the actions required by paragraph (h) of this AD can be found in Boeing Alert Service Bulletin 737-31A1880, Revision 1, dated September 16, 2020, which is referred to in Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020. (i) Exceptions to Requirements Bulletin Specifications (1) Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020, use the phrase “Within 12 months—after the Revision 1 date of Requirements Bulletin 737-31A1880 RB,” this AD requires using “Within 12 months after the effective date of this AD.” (2) The requirements of paragraph (h) of this AD do not apply to airplanes with Common Display System (CDS) Block Point 06 installed. (j) Terminating Action for AFM Revision Accomplishment of the actions specified by paragraph (h) of this AD by an operator's entire affected fleet terminates the actions required by paragraph (g) of this AD, and the AFM revision required by paragraph (g) of this AD may be removed from the AFM. (k) Credit for Previous Actions This paragraph provides credit for the actions specified in paragraph (h) of this AD, if those actions were performed before the effective date of this AD using Boeing Alert Requirements Bulletin 737-31A1880 RB, dated April 17, 2020, which is not incorporated by reference in this AD. (l) Special Flight Permit Special flight permits may be issued in accordance with 14 CFR 21.197 and 21.199 to operate the airplane to a location where the actions required by this AD can be performed, provided the airplane is operated in accordance with the AFM limitation required by paragraph (g) of this AD. (m) Alternative Methods of Compliance (AMOCs) (1) The Manager, Continued Operational Safety Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. 
                            ( print page 77448)
                            In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in paragraph (n)(1) of this AD. Information may be emailed to: 
                            *AMOC@faa.gov*. (2) Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office. (3) An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization (ODA) that has been authorized by the Manager, Continued Operational Safety Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD. (n) Related Information (1) For more information about this AD, contact Douglas Y. Tsuji, Aviation Safety Engineer, FAA, 2200 South 216th St., Des Moines, WA 98198; phone: 206-231-3548; email: 
                            *Douglas.Tsuji@faa.gov*. (2) Material identified in this AD that is not incorporated by reference is available at the addresses specified in paragraph (o)(3) of this AD. (o) Material Incorporated by Reference (1) The Director of the Federal Register approved the incorporation by reference (IBR) of the material listed in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51. (2) You must use this material as applicable to do the actions required by this AD, unless the AD specifies otherwise. (i) Boeing Alert Requirements Bulletin 737-31A1880 RB, Revision 1, dated September 16, 2020. (ii) [Reserved] (3) For Boeing material identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services (C&DS), 2600 Westminster Blvd., MC 110 SK57, Seal Beach, CA 90740-5600; telephone 562-797-1717; website myboeingfleet.com. (4) You may view this material at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 206-231-3195. (5) You may view this material that is incorporated by reference at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, email 
                            *fr.inspection@nara.gov*, or go to: 
                            *www.archives.gov/​federal-register/​cfr/​ibr-locations.html.* Issued on August 1, 2024. Peter A. White, Deputy Director, Integrated Certificate Management Division, Aircraft Certification Service.


[FR Doc. 2024-21557 Filed 9-20-24; 8:45 am] BILLING CODE 4910-13-P