{"id":"F2006B02816","name":"AD/B737/114 Amdt 1 - Aileron","slug":"ad-b737-114-amdt-1-aileron","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42158,"registerId":"commonwealth-F2006B02816-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/114 Amdt 1 - Aileron","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 737 Series Aeroplanes\n\nAD/B737/114\n\nAmdt 1\n\n  \nAileron 6/98\n\nApplicability: All Model 737-100, \\-200, \\-300, \\-400, and \\-500 series aircraft.\n\nRequirement: a. Perform a one-time visual inspection to determine if an aileron built by Tramco Inc. (trading as BFGoodrich Aerospace, Repair Station HN6R593N), having any of the following serial numbers and correlating part numbers is installed on the aircraft:\n\n| Serial Number | Part Number  |\n| ------------- | ------------ |\n| BN23          | 65-46454-22  |\n| BN49          | 65-46454-23  |\n| BN56          | 65-46454-24  |\n| BN59          | 65-46454-24A |\n| BN167         | 65-46454-24  |\n| BN180         | 65-46454-23  |\n| BN206         | 65-46454-2   |\n| BN236         | 65-46454-24  |\n| 162           | 65-46454-24  |\n| 237           | 65-46454-24  |\n\nb. If any aileron is found with an affected serial number and correlating part number identified in Requirement paragraph (a), remove the defective aileron, and replace it with a new or serviceable aileron.\n\nNote: FAA AD 98-03-09 Amdt 39-10301 refers.\n\nCompliance: Unless already accomplished, before 21 July 1998.\n\nThis amendment becomes effective on 21 May 1998.\n\nBackground: The FAA received two reports of failure of the aileron on Boeing Model 737 series aircraft. In one incident, a two-foot section of an aileron separated from the aircraft during descent, which resulted in vibration of the flight controls. In the second incident, 30 percent of an aileron separated from the aircraft during climb.\n\nInvestigation revealed that the cause of these failures has been attributed to an inappropriate repair procedure.\n\nAmendment 1 is issued in response to a new FAA AD which gives additional information that specifies the identification of certain part numbers.\n\nThe original issue of this Airworthiness Directive became effective on 26 February 1998.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: identifying and removing defective ailerons on Boeing 737 aircraft. The amendment simply adds specificity by including additional part numbers to the inspection criteria based on new FAA information, without expanding the scope beyond the original safety concern."},"complexity_factors":["Very short document (under 300 words)","Only 2 main requirements: visual inspection and conditional replacement","Single table with 10 specific serial/part number combinations","No defined terms section","No cross-references to other legislation (only a note referencing related FAA directive)","Simple conditional logic: if found → then remove/replace","Clear, fixed compliance deadline"],"plain_english_summary":"This Civil Aviation Safety Authority Airworthiness Directive orders Australian operators of Boeing 737-100 to -500 aircraft to inspect Tramco (BFGoodrich) ailerons for specified serial numbers and to remove and replace any defective units. It follows two in‑flight aileron separations traced to faulty repairs and prevents potentially catastrophic loss of control. The AD (Amendment 1) adds additional part numbers; required inspections were to be completed by 21 July 1998."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 refines the original directive by specifying additional part-number identification details for certain aileron serial numbers (it narrows/clarifies identification). It does not expand the applicability beyond the original set of aircraft or add new mandatory obligations beyond the inspection-and-replace requirement, so the instrument’s scope has not grown significantly beyond its original safety purpose."},"complexity_factors":["Short text: single-page, single-issue directive","Clear applicability (specific Boeing 737 series)","List of 10 serial numbers correlated to part numbers (simple lookup)","Two-step requirement: (a) inspect, (b) replace if affected","One-time action with a single compliance deadline","Cross-reference to FAA AD for additional information (minor external dependency)","Minimal conditional logic and no nested exceptions"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- It requires operators of certain Boeing 737 models to do a one-time visual check to see whether a specific set of ailerons (the control surfaces on the wing that control roll) manufactured by Tramco Inc. / BFGoodrich are installed on the aircraft (Requirement paragraph (a)).\n- If one of the identified ailerons is installed, the operator must remove that aileron and replace it with a new or serviceable aileron (Requirement paragraph (b)).\n- The directive cross-references FAA AD 98-03-09 for related information and sets a compliance deadline: unless already done, the inspection and any required replacement must be completed before 21 July 1998. The amendment itself took effect on 21 May 1998 (Compliance).\n\n**Who is affected**\n\n- All operators and owners of Boeing 737-100, -200, -300, -400 and -500 series aeroplanes (Applicability).\n- Maintenance organisations, repair stations and parts suppliers who install, certify, or supply ailerons for these aircraft.\n\n**Why it matters (stated purpose and technical cause)**\n\n- The background states the Federal Aviation Administration (FAA) received two reports where substantial portions of an aileron separated from Boeing 737 aeroplanes in flight, causing control vibration. Investigators attributed the failures to an inappropriate repair procedure on ailerons manufactured by Tramco/BFGoodrich (Background).\n- The AD’s stated purpose is to identify and remove those specific ailerons (identified by serial and part numbers) to prevent further in-flight separations (Requirement; Background).\n\n**Practical effects and how compliance works**\n\n- Operators must visually inspect for the listed serial numbers and matching part numbers (a short task for maintenance crews) (Requirement (a)).\n- If any affected aileron is found, it must be removed and replaced with a new or serviceable aileron (Requirement (b)).\n- The action is mandatory and time-limited: a one-time action due by the specified date unless already done (Compliance).\n\n**Who pays, who decides, and what behaviour changes**\n\n- Aircraft operators pay for the inspection and for replacement ailerons and labour if an affected part is found. Any downtime costs (lost revenue, schedule disruption) are also borne by the operator.\n- Civil Aviation Safety Authority (CASA) (via the AD) decides the mandatory action; operators/maintenance organisations decide how and when to schedule the inspection and replacement, subject to the compliance deadline.\n- Behaviour change: operators must check their fleet and, where necessary, remove and replace identified ailerons rather than continue operating them.\n\n**Costs, incentives, and trade-offs**\n\n- Direct costs: inspection labour (typically low) and replacement part and installation costs (potentially significant if an aileron must be replaced).\n- Opportunity costs: aircraft downtime while awaiting parts or completing repairs; potential short-term capacity reductions for airlines.\n- Incentives: operators have a clear safety and regulatory incentive to comply; manufacturers and parts suppliers may face demand for replacement parts.\n- Substitution effects: operators may source serviceable ailerons from inventory or the aftermarket; availability of parts could affect how long an aircraft is out of service.\n\n**Implementation risks and compliance burden**\n\n- Identification risk: mislabelling or incomplete records could make it harder to confirm whether an aileron is one of the listed items (the AD relies on serial and part number matching).\n- Compliance burden is narrow in scope: a one-time visual inspection and replacement if necessary. The administrative burden is low but replacement costs and downtime may be material for affected aircraft.\n- Bureaucratic discretion is limited: the AD prescribes the action and deadline. The AD references FAA material for further information but does not leave substantial discretion to operators about whether to act.\n\n**Effect on private enterprise and markets**\n\n- Small, targeted effect: imposes costs on affected operators and creates short-term demand for replacement ailerons and maintenance services. It does not change ownership rights, contract freedom, or market structure beyond that demand shift.\n\n**Source claims vs mechanics**\n\n- The AD claims the repairs were inappropriate and caused separations (Background). Mechanically, the AD implements the claim by identifying suspect serial/part-number combinations and requiring removal and replacement (Requirement paragraphs (a) and (b)). The concrete mechanism to reduce risk is physical removal and replacement of identified parts by the compliance date.\n\n**Key reference points in the instrument**\n\n- Applicability: all Boeing 737-100/200/300/400/500 series aircraft.\n- Requirement paragraph (a): one-time visual inspection for listed serial and part numbers.\n- Requirement paragraph (b): mandatory removal and replacement of affected ailerons.\n- Compliance date: before 21 July 1998, with the amendment effective 21 May 1998.\n- Background and cross-reference: FAA AD 98-03-09 (Background).\n"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-114-amdt-1-aileron","history":"/api/acts/ad-b737-114-amdt-1-aileron/history","analysis":"/api/acts/ad-b737-114-amdt-1-aileron/analysis","conflicts":"/api/acts/ad-b737-114-amdt-1-aileron/conflicts","importantCases":"/api/acts/ad-b737-114-amdt-1-aileron/important-cases","documents":"/api/acts/ad-b737-114-amdt-1-aileron/documents"}}