Federal Aviation Administration 2009 – Federal Register Recent Federal Regulation Documents
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Fuel Drain Valves
This notice announces the cancellation of TSO-C76a, Fuel Drain Valves. If you have reason to believe that this proposed action will negatively impact aviation safety, we would like to solicit your comments.
Fuel Drain Valves
This notice announces the re-issuance of TSO-C76, Fuel Drain Valves, telling manufacturers seeking TSO authorization (TSOA) or letter of design approval (LODA) what minimum performance standard (MPS) their Fuel Drain Valve must first meet for approval and identification with the appropriate TSO markings. In the event that you feel a need to comment on the re-issuance of TSO-C76, please do so to
Activation of Ice Protection
The Federal Aviation Administration amends the airworthiness standards applicable to transport category airplanes certificated for flight in icing conditions. The rule requires a means to ensure timely activation of the airframe ice protection system. This rule is the result of information gathered from a review of icing accidents and incidents, and will improve the level of safety for new airplane designs for operations in icing conditions.
Airworthiness Directives; Bell Helicopter Textron Canada Model 427 Helicopters
We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Canada (BHTC) Model 427 helicopters. This AD results from mandatory continuing airworthiness information (MCAI) originated by the aviation authority of Canada to identify and correct an unsafe condition on an aviation product. Transport Canada, the aviation authority of Canada, with which we have a bilateral agreement, states that it has been determined that the existing hardware connecting the vertical fin to the tail rotor gearbox needs to be upgraded to prevent the vertical fin from becoming loose.
Airworthiness Directives; Eurocopter France Model AS 332 C, L, L1, and L2; AS 350 B3; AS 355 F, F1, F2, and N; SA 365 N and N1; AS 365 N2 and N3; SA 366 G1; EC 130 B4; and EC 155B and B1 Helicopters
We propose to adopt a new airworthiness directive (AD) for the specified model helicopters. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by the European Aviation Safety Agency (EASA), which is the Technical Agent for the Member States of the European Community. The MCAI states that the AD is issued following a manufacturing nonconformity found on one batch of the servo-control caps. With a defective servo-control, rotation of the distributor might not be stopped mechanically since only friction of inner seals holds the distributor sleeve in its position. The proposed
Airworthiness Directives; Reims Aviation S.A. Model F406 Airplanes
We propose to rescind an airworthiness directive (AD) for the products listed above. The existing AD resulted from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Technical Amendments Concerning Amateur Rocket Activities
The FAA is making several editorial changes to the amateur rocket regulations. The intent of this action is to ensure the regulations are clear and accurate.
Proposed Amendment of Class E Airspace; Minden, NE
This action proposes to amend Class E airspace at Minden, NE. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Pioneer Village Field Airport, Minden, NE. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) operations for SIAPs at Pioneer Village Field Airport.
Proposed Amendment of Class E Airspace; Tioga, ND
This action proposes to amend Class E airspace at Tioga, ND. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Tioga Municipal Airport, Tioga, ND. This action also amends the geographic coordinates of Tioga Municipal Airport. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) operations for SIAPs at Tioga Municipal Airport.
Amendment of Class E Airspace; Iowa Falls, IA
This action amends Class E airspace at Iowa Falls, IA. Additional controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Iowa Falls Municipal Airport, Iowa Falls, IA. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Iowa Falls Municipal Airport.
Proposed Amendment of Class D and Class E Airspace; New Orleans NAS, LA
This action proposes to amend Class D and Class E airspace at New Orleans NAS, LA. Changes in control tower operating hours for Class D airspace and cancellation of the NDB RWY 4 instrument approach for Class E airspace have made this action necessary for the continued safety and management of Instrument Flight Rules (IFR) aircraft operations at New Orleans NAS Alvin Callender Field.
Proposed Amendment of Class E Airspace; St. Louis, MO
This action proposes to amend Class E airspace for the St. Louis, MO, area. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Spirit of St. Louis Airport, St. Louis, MO. Also, there would be minor adjustments to the geographic coordinates for Lambert-St. Louis International Airport, St. Louis VORTAC, and the Foristell VORTAC. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) aircraft operations at Spirit of St. Louis Airport.
Proposed Amendment of Class E Airspace; Winona, MN
This action proposes to amend Class E airspace at Winona, MN. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Winona Municipal Airport-Max Conrad Field, Winona, MN. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) operations for SIAPs at Winona Municipal Airport-Max Conrad Field.
Crew Resource Management Training for Crewmembers in Part 135 Operations
This action extends the comment period for a proposed rule that was published on May 1, 2009. The proposed rule would require all certificate holders conducting operations under part 135 to include in their training programs crew resource management for crewmembers, including pilots and flight attendants. This proposal is needed to ensure that crewmembers in part 135 operations receive training and practice in the use of crew resource management principles, as appropriate for their operation. This proposed rule would respond to National Transportation
Airworthiness Standards; Fire Protection
The FAA amends the airworthiness standards for issuance of original and amended aircraft engine type certificates for fire protection. The new standard will change aircraft engine fire protection certification standards to update and harmonize them with European Aviation Safety Agency (EASA) fire protection requirements, thereby simplifying airworthiness approvals for import and export purposes.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR 21.611(a) and (b), 21.607(c) and 21.613(a)(1). The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR 21.191(i)(1). The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Proposed Amendment of Class D and Class E Airspace; Topeka Forbes Field Airport, KS
This action proposes to amend Class D and Class E airspace for Forbes Field Airport, Topeka, KS. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Forbes Field Airport, Topeka, KS. This action also incorporates the Class E as extensions to Class D at Forbes Field Airport into the Class D surface area. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) aircraft operations at Forbes Field Airport.
Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135BJ, -135ER, -135KE, -135KL, and -135LR Airplanes; and EMB-145, -145ER, -145MR, -145LR, -145XR, -145MP, and -145EP Airplanes
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Airworthiness Directives; McDonnell Douglas Model DC-9-14, DC-9-15, and DC-9-15F Airplanes; and McDonnell Douglas Model DC-9-20, DC-9-30, DC-9-40, and DC-9-50 Series Airplanes
The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all McDonnell Douglas Model DC-9-14, DC- 9-15, and DC-9-15F airplanes; and McDonnell Douglas Model DC-9-20, DC- 9-30, DC-9-40, and DC-9-50 series airplanes. The existing AD currently requires repetitive inspections for cracks of the main landing gear (MLG) shock strut cylinder, and related investigative and corrective actions if necessary. This proposed AD would add more work on airplanes that have main landing gear shock struts with certain identified part numbers. This proposed AD results from two reports of a collapsed MLG and a report of cracks in two MLG cylinders. We are proposing this AD to detect and correct fatigue cracks in the shock strut cylinder of the MLG, which could result in a collapsed MLG during takeoff or landing, and possible reduced structural integrity of the airplane.
Notice of Opportunity for Public Comment on Surplus Property Release at Jackson International Airport, Jackson, MS
Under the provisions of Title 49, U.S.C. 47153(c), notice is being given that the FAA is considering a request from the Jackson Municipal Airport Authority to waive the requirement that a 9.13-acre parcel, a 0.13-acre parcel, and a 20.54-acre parcel of surplus property, located at the Jackson International Airport, be used for aeronautical purposes.
Proposed Amendment of Class E Airspace; Peoria, IL
This action proposes to amend Class E airspace for the Peoria, IL area. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Mount Hawley Auxiliary Airport, Peoria, IL. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) aircraft operations at Mount Hawley Auxiliary Airport.
Amendment of Class E Airspace; Ironwood, MI
This action amends Class E airspace at Ironwood, MI. Additional controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Gogebic Iron County Airport, Ironwood, MI. This action also makes a minor change to the airspace description, removing the reference to the Ironwood ILS. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Gogebic Iron County Airport.
Proposed Establishment of Class E Airspace; Little River, CA
This action proposes to establish Class E airspace at Little River, CA. Controlled airspace is necessary to accommodate aircraft using a new Area Navigation (RNAV) Global Positioning System (GPS) Standard Instrument Approach Procedure (SIAP) at Little River Airport, Little River, CA. The FAA is proposing this action to enhance the safety and management of aircraft operations at Little River Airport, Little River, CA.
Amendment of Class E Airspace; Monee, IL
This action amends Class E airspace at Monee, IL. Additional controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Bult Field Airport, Monee, IL. This action also reflects the name change of the airport from Sanger Airport and updates the geographic coordinates to coincide with the FAA's National Aerospace Charting Office. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Bult Field Airport.
Airworthiness Directives; Engine Components, Inc. (ECi) Reciprocating Engine Cylinder Assemblies
The FAA proposes to supersede an existing airworthiness directive (AD) for Lycoming Engines (formerly Textron Lycoming) models 320, 360, and 540 series, ``Parallel Valve'' reciprocating engines, with certain Engine Components, Inc. (ECi) cylinder assemblies, part number (P/N) AEL65102 series ``Titan,'' installed. That AD currently requires initial and repetitive visual inspections and compression tests to detect cracks at the head-to-barrel interface, replacement of cylinder assemblies found cracked, and replacement of certain cylinder assemblies at new, reduced times-in-service. This proposed AD would require the same actions, but for an expanded population of cylinder assemblies. This proposed AD results from reports of 10 additional cylinder head separations since issuing AD 2008-19-05, on cylinder serial numbers not listed in that AD. We are proposing this AD to prevent loss of engine power due to cracks at the head-to-barrel interface and possible engine failure caused by separation of a cylinder head, which could result in loss of control of the aircraft.
Airworthiness Directives; Boeing Model 737-600, -700, -700C, -800, -900, and -900ER Series Airplanes
We propose to adopt a new airworthiness directive (AD) for certain Boeing Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes. This proposed AD would require replacing the engine fuel shutoff valves for the left and right main tanks. This proposed AD results from a report of a failed engine start, which was caused by an internally fractured engine fuel shutoff valve. We are issuing this AD to prevent the failure of the valve in the closed position, open position, or partially open position, which could result in engine fuel flow problems and possible uncontrolled fuel leak or fire.
Advisory Circular 33.87-2, Comparative Endurance Test Method To Show Durability for Parts Manufacturer Approval of Turbine Engine and Auxiliary Power Unit Parts
This notice announces the issuance of Advisory Circular (AC) 33.87-2, Comparative Endurance Test Method to Show Durability for Parts Manufacturer Approval of Turbine Engine and Auxiliary Power Unit Parts. This AC describes a comparative endurance test method to be used for certain turbine engine or auxiliary power unit parts when manufactured under Parts Manufacturer Approval (PMA). This method may be used when PMA applicants introduce changes that could affect the durability of their proposed designs. It may also be used when an applicant has insufficient comparative data to show that the durability of their proposed PMA part is at least equal to the type design. The applicant can use this method when requesting PMA under test and computation, per part 21 of Title 14 of the Code of Federal Regulations, and using the comparative test and analysis approach detailed in Federal Aviation Administration Order 8110.42, Part Manufacturer Approval Procedures.
Airworthiness Directives; BAE Systems (Operations) Limited Model BAe 146-100A and 146-200A Series Airplanes
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Airworthiness Directives; Airbus Model A330-200, A330-300, A340-200, and A340-300 Series Airplanes
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: * * * * *
Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-120, -120ER, -120FC, -120QC, and -120RT Airplanes
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:
Amendment of Class E Airspace; Ankeny, IA
This action amends Class E airspace at Ankeny, IA. Cancellation of NDB approaches at Ankeny Regional Airport has made it necessary to reconfigure Class E airspace. Controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Ankeny Regional Airport, Ankeny, IA. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Ankeny Regional Airport. This action also updates the geographic coordinates of the airport to coincide with the FAA's National Aeronautical Charting Office.
Amendment of Class E Airspace; Minneapolis, MN
This action amends Class E airspace at Minneapolis, MN. Additional controlled airspace is necessary to accommodate Area Navigation (RNAV) Standard Instrument Approach Procedures (SIAP) at Anoka County-Blaine Airport (Janes Field), Minneapolis, MN. This action also updates the geographic coordinates of the Anoka County-Blaine Airport (Janes Field) and Minneapolis-St. Paul International Airport to coincide with the FAA's National Aeronautical Charting Office, and makes minor corrections to the legal description published in the Notice of Proposed Rulemaking. The FAA is taking this action to enhance the safety and management of Instrument Flight Rule (IFR) operations at Anoka County-Blaine Airport (Janes Field).
Notice of Cancellation of Environmental Impact Statement for the West Bend Municipal Airport, West Bend, WI
The Federal Aviation Administration (FAA) announces that is has discontinued the preparation of an Environmental Impact Statement (EIS) for proposed development at West Bend Municipal Airport, West Bend, Wisconsin. The FAA is doing so because the current proposed development is not ripe for decision at this time and lacks proper support and justification in the near-term planning period.
Proposed Amendment of Class E Airspace; Platteville, WI
This action proposes to amend Class E airspace at Platteville, WI. Additional controlled airspace is necessary to accommodate new Standard Instrument Approach Procedures (SIAPs) at Platteville Municipal Airport, Platteville, WI. This action would also reflect the name change of the airport from Grant County Airport and update the geographic coordinates to coincide with the FAAs National Aeronautical Charting Office. The FAA is taking this action to enhance the safety and management of Instrument Flight Rules (IFR) operations for SIAPs at Platteville Municipal Airport.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR. The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR. The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR. The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Petition for Exemption; Summary of Petition Received
This notice contains a summary of a petition seeking relief from specified requirements of 14 CFR. The purpose of this notice is to improve the public's awareness of, and participation in, this aspect of FAA's regulatory activities. Neither publication of this notice nor the inclusion or omission of information in the summary is intended to affect the legal status of the petition or its final disposition.
Airworthiness Directives; Pratt & Whitney Canada (PWC) PW206A, PW206B, PW206B2, PW206C, PW206E, PW207C, PW207D, and PW207E Turboshaft Engines; Correction
The FAA is correcting airworthiness directive (AD) 2009-03-05. That AD applies to PWC PW206 and PW207 series turboshaft engines. We published that AD in the Federal Register on February 20, 2009 (74 FR 7794). Paragraph (d) in the regulatory text is incorrect. This document corrects that paragraph. In all other respects, the original document remains the same.
Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes
We propose to adopt a new airworthiness directive (AD) for the products listed above that would supersede an existing AD. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: There have been several cases of wing leading edge anti-ice piccolo duct failure reported on CL-600- 2B19 (CRJ) aircraft. Upon investigation, it was determined that ducts manufactured since May 2000 are susceptible to cracking due to the process used to drill holes in the ducts. This cracking may cause air leakage, with a possible adverse effect on the anti-ice air distribution pattern and anti-ice capability, without annunciation to the flight crew [and consequent reduced controllability of the airplane]. It has subsequently been determined that faulty ducts may also have been installed in a number of leading edge assemblies built as spares and whose current locations are not specifically known.
Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals
The FAA publishes a monthly notice, as appropriate, of PFC approvals and disapprovals under the Provisions of the Aviation Safety and Capacity Expansion Act of 1990 (Title IX of the Omnibus Budget Reconciliation Act of 1990) (Public Law 101-508) and Part 158 of the Federal Aviation Regulations (14 CFR Part 158). This notice is published pursuant to paragraph d of Sec. 158.29.
Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals
The FAA publishes a monthly notice, as appropriate, of PFC approvals and disapprovals under the provisions of the Aviation Safety and Capacity Expansion Act of 1990 (Title IX of the Omnibus Budget Reconciliation Act of 1990) (Pub. L. No. 101-508) and Part 158 of the Federal Aviation Regulations (14 CFR Part 158). This notice is published pursuant to paragraph d of Sec. 158.29.
Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals
The FAA publishes a monthly notice, as appropriate, of PFC approvals and disapprovals under the provisions of the Aviation Safety and Capacity Expansion Act of 1990 (Title IX of the Omnibus Budget Reconciliation Act of 1990) (Pub. L. 101-508) and Part 158 of the Federal Aviation Regulations (14 CFR Part 158). This notice is published pursuant to paragraph d of Sec. 158.29.
Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals
The FAA publishes a monthly notice, as appropriate, of PFC approvals and disapprovals under the provisions of the Aviation Safety and Capacity Expansion Act of 1990 (Title IX of the Omnibus Budget Reconciliation Act of 1990) (Pub. L. 101-508) and Part 158 of the Federal Aviation Regulations (14 CFR Part 158). This notice is published pursuant to paragraph d of Sec. 158.29.
Notice of Passenger Facility Charge (PFC) Approvals and Disapprovals
The FAA publishes a monthly notice, as appropriate, of PFC approvals and disapprovals under the provisions of the Aviation Safety and Capacity Expansion Act of 1990 (Title IX of the Omnibus Budget Reconciliation Act of 1990) (Pub. L. 101-508) and Part 158 of the Federal Aviation Regulations (14 CFR Part 158). This notice is published pursuant to paragraph d of Sec. 158.29.
Safety Management System
This ANPRM solicits public comments on a potential rulemaking requiring certain 14 CFR part 21, 119, 121, 125, 135, 141, 142, and 145 certificate holders, product manufacturers, applicants, and employers (hereafter ``product/service providers'') to develop a Safety Management System (SMS). SMS is a comprehensive, process-oriented approach to managing safety throughout an organization. An SMS includes an organization-wide safety policy, formal methods of identifying hazards, mitigating and continually assessing risk, and promotion of a safety culture. SMS stresses not only compliance with technical standards but increased emphasis on the organizational aspects and processes that ensure risk management and safety assurance.
Airworthiness Directives; CFM International, S.A Model CFM56-3B1 and -3B2 Turbofan Engines
The FAA proposes to adopt a new airworthiness directive (AD) for certain CFM International Model CFM56-3B1 and -3B2 turbofan engines. This proposed AD would require initial and repetitive inspections for damage to the fan blades. This proposed AD results from a report of a failed fan blade with severe out-of-limit wear on the underside of the blade platform where it contacts the damper. We are proposing this AD to prevent failure of multiple fan blades, which could result in an uncontained failure of the engine and damage to the airplane.
Airworthiness Directives; Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Under certain ambient conditions, ice can accumulate on the walls of the fuel pipes within the aircraft fuel system, which can then be released downstream when fuel flow demand is increased. This released ice can then collect on the fuel-to-oil heat exchanger (FOHE) front face and limit fuel flow through the FOHE.
Airworthiness Directives; Boeing Model 747-200F, 747-200C, 747-400, 747-400D, and 747-400F Series Airplanes
The FAA proposes to supersede an existing airworthiness directive (AD) that applies to all Boeing Model 747-200F, 747-200C, 747-400, 747-400D, and 747-400F series airplanes. The existing AD currently requires repetitive inspections for cracking of certain fuselage internal structure (i.e., Sections 42 and 46 fuselage frames, upper deck floor beams, electronic bay access door cutout, nose wheel well, and main entry doors and door cutouts), and repair if necessary. This proposed AD would require additional repetitive inspections for cracking of certain fuselage structure (i.e., Section 41 fuselage frames where they connect to upper deck floor beams, and section 41 fuselage frames between stringer (S-8 and S-12), and related investigative/corrective actions if necessary. This proposed AD would also reduce the inspection threshold and repetitive inspection intervals for certain airplanes. This proposed AD results from fatigue tests and analysis by Boeing that identified additional areas of the fuselage where fatigue cracks can occur. We are proposing this AD to prevent the loss of structural integrity of the fuselage, which could result in rapid depressurization of the airplane.
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