{"id":"F2020L00408","name":"AD/AA-5/23 Amdt 4 Aileron System – Inspections and Modification","slug":"ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":100926,"registerId":"commonwealth-F2020L00408-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"True Flight Holdings (Gulfstream / Grumm","sectionType":"part","heading":"True Flight Holdings (Gulfstream / Grumman / American General) AA-5 Series Aeroplanes","content":"# True Flight Holdings (Gulfstream / Grumman / American General) AA-5 Series Aeroplanes\n\n| AD/AA-5/23 Amdt 4 | Aileron System – Inspections and Modification | 8/2020 |\n| ----------------- | --------------------------------------------- | ------ |\n\n| Applicability: | True Flight Holdings (Gulfstream / Grumman / American General), model AA-5 aircraft with serial numbers AA5-0001 and subsequent, model AA-5A aircraft with serial numbers AA-5A-0001 and subsequent, and model AA-5B aircraft with serial numbers AA5B-0001 and subsequent. This AD does not apply to aircraft that comply with Tiger Aircraft LLC Service Instruction SI 06-01, as in force from time to time. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the aircraft in accordance with Gulfstream Aerospace Service Bulletin (SB) 165A, as in force from time to time.Note: The words “as in force from time to time” require compliance with the most recent version of the referenced document. |\n| Compliance: | 1. Conduct the inspection within 25 hours’ time in service after 26 November 1979, and thereafter at intervals not exceeding 100 hours’ time in service unless the aileron has been modified in accordance with Gulfstream Aerospace Service Kit No. 150, as in force from time to time. If the aileron has been so modified:(a) comply with the note (about the autopilot) on page 2 of SB 165A, as in force from time to time, and(b) for AA5A, AA5B and AA5 model aircraft with 5202035-505 aileron torque tube assemblies, also comply with Gulfstream Aerospace Service Bulletin SB 168, as in force from time to time. Inspections must be conducted in accordance with SB 168 every 100 hours’ time in service for 5 consecutive inspections without defect. |\n| | This AD commences on 17 April 2020. |\n| Background: | The manufacturer of the aircraft received reports of aileron oscillation in flight and released Gulfstream American SB 165 which was then amended and released as Gulfstream Aerospace SB 165A, that allowed operators to follow an inspection procedure or modify the ailerons. Simultaneously the FAA released AD 79-22-04 Amdt. 39-3600. The modification requires trimming the trailing edge of each aileron. Ailerons with trimmed trailing edges create much greater control forces which exceed the capability of the autopilot and permanent disconnection of the autopilot is therefore required.Later reports of looseness in the aileron torque tube joints of those aeroplanes modified with Gulfstream American SK-150, required Gulfstream Aerospace SB 168 to be released. In 2006, Tiger Aircraft released Service Instruction SI 06-01, an accepted FAA AD 79-22-04 alternate means of compliance. The 100 hourly inspections are eliminated by verifying the ailerons are correctly contoured. The service instructions contain details on fabricating a contour inspection template.This amendment is issued to update a referenced document from Gulfstream American SB 165 to Gulfstream Aerospace SB 165A and to approve the accomplishment of SI 06-01 as terminating action for the 100 hourly repetitive inspections required by both FAA AD 79-22-04 and Gulfstream American SB 165A. |\n\n![A drawing of a face\nDescription automatically generated](image.001.jpeg)\n\nPieter van Dijk \nDelegate of the Civil Aviation Safety Authority\n\n3 April 2020","sortOrder":0},{"sectionNumber":"AD/AA-5/23 Amdt 4","sectionType":"part","heading":"AD/AA-5/23 Amdt 4","content":"## AD/AA-5/23 Amdt 4","sortOrder":1},{"sectionNumber":"Aileron System — Inspections and Modific","sectionType":"part","heading":"Aileron System — Inspections and Modification","content":"## Aileron System – Inspections and Modification","sortOrder":2},{"sectionNumber":"8/2020","sectionType":"part","heading":"8/2020","content":"## 8/2020","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment updates the cited service document from Gulfstream American SB 165 to Gulfstream Aerospace SB 165A and explicitly approves Tiger Aircraft SI 06‑01 as a terminating action to remove the 100‑hour repetitive inspections. It therefore narrows recurring inspection obligations for aircraft that implement the approved alternative while otherwise preserving the original inspection/modification mandate."},"complexity_factors":["Applicability limited to specific models and serial numbers (Applicability).","Multiple external documents referenced 'as in force from time to time' (Gulfstream SB 165A, SB 168; Service Kit No.150; Tiger SI 06‑01) which import evolving technical requirements (Requirement; Compliance).","Layered compliance timing: initial inspection within 25 hours after 26 Nov 1979, then every 100 hours unless modification/terminating action applied (Compliance).","Alternative/terminating action: Tiger SI 06‑01 is approved to eliminate the 100‑hour repetitive inspections, creating a conditional exemption (Background; Applicability).","Technical operational consequence: the specified modification increases control forces and requires permanent autopilot disconnection, imposing an operational constraint and potential equipment change (Background).","Sequential verification requirement: for certain torque tube assemblies, compliance with SB 168 every 100 hours for five consecutive inspections without defect before relief (Compliance).","Document‑update amendment: replaces reference to Gulfstream American SB 165 with Gulfstream Aerospace SB 165A, creating potential implementation and version‑control considerations (Background)."],"plain_english_summary":"Requires owners/operators of True Flight Holdings AA‑5, AA‑5A and AA‑5B aeroplanes (specified serial numbers) to inspect aileron systems to detect oscillation or torque‑tube looseness, and to modify ailerons if directed. The rule references Gulfstream Aerospace service bulletins (SB 165A, SB 168) or allows an approved alternative (Tiger SI 06‑01). It matters because trimming the aileron trailing edge raises control forces (forcing permanent autopilot disconnection) and because repetitive inspections or modification reduce the risk of in‑flight aileron problems."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"Originally issued in 1979 as FAA AD 79-22-04 to address immediate aileron oscillation safety concerns, this Australian directive has expanded significantly. The 2020 amendment (Amendment 4) adds: (1) recognition of Tiger Aircraft LLC's 2006 Service Instruction as an approved alternate means of compliance, effectively adding a third compliance pathway; (2) additional requirements for specific torque tube assemblies (SB 168) that were not in the original scope; and (3) updated document references reflecting corporate ownership changes (Gulfstream American to Gulfstream Aerospace). The directive has evolved from a simple 'inspect or modify' mandate to a complex matrix of historical modifications, alternative compliance methods, and conditional inspection regimes."},"complexity_factors":["Multiple overlapping compliance paths: inspection-only, modification with kit, or alternative compliance via SI 06-01","Conditional logic: different requirements apply depending on whether modification Kit 150 has been installed, whether specific torque tube assemblies (part number 5202035-505) are present, and whether SI 06-01 has been followed","Temporal references: 'as in force from time to time' used 6 times, creating dynamic compliance obligations where the referenced document may change after the AD is issued","Nested exceptions: the modification triggers additional requirements (autopilot disconnection note + potential SB 168 compliance), while SI 06-01 acts as terminating action for the repetitive inspections","Specific part number references (5202035-505) requiring technical cross-referencing","Historical layering: references to 1979 FAA AD, multiple service bulletins (SB 165, 165A, 168), and a 2006 service instruction, creating a chain of predecessor documents"],"plain_english_summary":"This CASA Airworthiness Directive targets True Flight Holdings (AA-5, AA-5A, AA-5B) light aircraft and requires inspection of ailerons for oscillation to prevent loss of control. Owners must inspect soon and at regular intervals unless they install a trimming modification (Service Kit No. 150), which cures the issue but mandates permanent autopilot disconnection. An approved Tiger Aircraft alternative method can instead terminate the repetitive inspections. The 2020 update modernises references and formally accepts the Tiger alternative."}},"importantCases":[],"_links":{"self":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification","history":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification/history","analysis":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification/analysis","conflicts":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification/conflicts","importantCases":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification/important-cases","documents":"/api/acts/ad-aa-5-23-amdt-4-aileron-system-inspections-and-modification/documents"}}