{"id":"F2006B10954","name":"AD/JETSTREAM/84 - Nose Landing Gear (NLG) - Inspection of Steering Jack","slug":"ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56521,"registerId":"commonwealth-F2006B10954-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/84 - Nose Landing Gear (NLG) - Inspection of Steering Jack","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)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/84 Nose Landing Gear (NLG) \\- Inspection\n\nof Steering Jack\n\n  \n6/99\n\nApplicability: All British Aerospace Regional Aircraft HP137 Mk 1 Jetstream Series 200, 3100 and 3200 series aircraft with the following nose landing gear (NLG) units installed:\n\n1873; B00A702852A; B00A703064A; B00A703056A.\n\nRequirement: Perform the maintenance actions described in Jetstream Service Bulletin 32-JA 981043 dated 05 Mar 99 and associated APPH Precision Hydraulics Service Newsletter.\n\nNote: Jetstream MSB 32-JA 981043 classified UK CAA MANDATORY refers.\n\nCompliance: Compliance to be achieved by 30th October 1999.\n\nThis Airworthiness Directive becomes effective on 17 June 1999.\n\nBackground: Incidents have been reported where cracking has occurred at the base of the thread in the steering jack piston rod Part No. 618212. Incorrect assembly or inadequate lubrication of the steering jack pivot points can cause unusually high operational loads. This could lead to a breakdown of the steering jack piston rod. This Directive introduces a one off inspection for correct assembly and lubrication of the steering jack pivot points.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive implements the remedial inspection described in the Background: a one‑off check of steering jack assembly and lubrication to address cracking of the piston rod. It does not broaden the affected fleet beyond the listed models and NLG units, nor does it impose recurring inspections or additional design requirements (Background; Applicability; Requirement)."},"complexity_factors":["Narrow applicability: specific BAe Jetstream Series 200, 3100 and 3200 aircraft with four listed NLG unit part numbers (Applicability).","Single, one‑off mandated action (Requirement): inspection for correct assembly and lubrication rather than recurring inspections or design changes.","Dependence on external technical documents: Jetstream Service Bulletin 32-JA 981043 and APPH Precision Hydraulics Service Newsletter are referenced for the required procedures (Requirement / Note).","Safety‑critical technical work: inspection/verification of pivot assembly, lubrication and detection of thread-base cracking requires qualified maintenance personnel and possible disassembly (Background).","Fixed compliance timetable: effective date and a compliance deadline (Compliance / Effective date) create scheduling and operational downtime considerations."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified British Aerospace Jetstream Series 200, 3100 and 3200 aeroplanes fitted with the listed nose landing gear units to carry out a one‑off inspection of the steering jack for correct assembly and lubrication, using Jetstream Service Bulletin 32-JA 981043 and the APPH service newsletter. Compliance is required by 30 October 1999 (effective 17 June 1999).\n\nThe measure responds to reported cracking of the steering jack piston rod. Operators bear the cost of inspection and any remedial work; qualified maintenance staff must verify assembly and lubrication to remove conditions that increase operational loads."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection of the nose landing gear steering jack."},"complexity_factors":["Single, specific technical requirement referencing external documents (Service Bulletin and Newsletter)","Limited applicability - only 4 specific part numbers and 3 aircraft series affected","No defined terms section or interpretation provisions","Simple compliance deadline structure (single date, no phased or hourly-based requirements)","No conditional logic, exceptions, or nested provisions","Background section provides clear rationale without legal cross-references"],"plain_english_summary":"CASA's Airworthiness Directive requires owners/operators of British Aerospace Jetstream Series 200, 3100 and 3200 aircraft fitted with certain nose-gear steering jacks (part nos. 1873, B00A702852A, B00A703064A, B00A703056A) to inspect the nose landing-gear steering jack because the piston-rod can crack at the thread base from incorrect assembly or poor lubrication, risking steering failure.\n\nCompliance with Jetstream Service Bulletin 32-JA 981043 and its technical newsletter is mandatory as a one‑off inspection before flight after 30 October 1999."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack","history":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack/history","analysis":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack/analysis","conflicts":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack/conflicts","importantCases":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack/important-cases","documents":"/api/acts/ad-jetstream-84-nose-landing-gear-nlg-inspection-of-steering-jack/documents"}}