{"id":"F2007L00110","name":"AD/CRESCO/11 - Nose Wheel Steering Assembly","slug":"ad-cresco-11-nose-wheel-steering-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68189,"registerId":"commonwealth-F2007L00110-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pacific Aerospace Corporation Cresco Ser","sectionType":"division","heading":"Pacific Aerospace Corporation Cresco Series Aeroplanes","content":"### Pacific Aerospace Corporation Cresco Series Aeroplanes\n\n| AD/CRESCO/11 | Nose Wheel Steering Assembly | 2/2007 |\n| ------------ | ---------------------------- | ------ |\n\n| Applicability: | All Cresco 08-600 aircraft on restricted category agricultural operations fitted with nose wheel steering pivot pin part number (P/N) 08-45711-1. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Inspect the operation of the nose wheel steering in accordance with the maintenance schedule in Chapter 05-10-00 page 616, of Pacific Aerospace Corporation (PAC) Cresco 08-600 Maintenance Manual (MM).Inspect the nose wheel steering and the torque link attachment of the link assembly P/N 245235-2 for wear and cracks, in accordance with the maintenance schedule in Chapter 05-10-00 page 615, and the wear limits and tolerances in Chapter 32-20-00, table 601, page 601 of PAC Cresco 08-600 MM.If parts replacement or re-bushing is required, accomplish before further flight.2. Inspect the nose wheel steering shimmy damper unit P/N 08-45725-2 for security and damage, in accordance with the maintenance schedule in Chapter 05-10-00 page 617 of PAC Cresco 08-600 MM.If parts replacement or adjustment is required, accomplish before further flight.If adjustment is required, accomplish in accordance with Chapter 32-50-00 page 501, of PAC Cresco 08-600 MM.3. Remove the nose wheel steering pivot pin P/N 08-45711-1 in accordance with Chapter 32 of the PAC Cresco 08-600 MM, and inspect the nose wheel steering pivot pin using an approved direct or indirect magnetic particle inspection method that is equivalent to ASTM Standard No. E-1444.If cracking is detected in the pivot pin, replace before further flight.4. Inspect the steering tube assembly P/N 245207 and the steering tube end fitting for cracks using an approved direct or indirect magnetic particle inspection method that is equivalent to ASTM Standard No. E-1444, and the maintenance schedule in Chapter 05-10-00 page 616 of PAC Cresco 08-600 MM.If cracking is detected, replace affected part before further flight.Re-assemble and lubricate the nose landing gear steering linkage assembly in accordance with Chapters 32 and 12 of PAC Cresco 08-600 MM. |\n\n| | Note 1: If cotter pin P/N 08-45729-1 does not align with the flat on the pivot pin P/N 08-45711-1, install a washer.Note 2: A pilot nose wheel shimmy incident report must be investigated to prevent design loads being exceeded in the steering components. Rework or replace worn steering link parts in accordance with the wear limits and tolerances specified in Chapter 32-20-00 table 601of PAC Cresco 08-600 MM. The adjustment of steering damper unit P/N 08-45725-2 must be accomplished in accordance with Chapter 32-50-00 page 501, of PAC Cresco 08-600 MM.Note 3: ASTM Standard No. E-1444 establishes minimum requirements for magnetic particle inspection examination used for the detection of surface or slightly subsurface discontinuities in ferromagnetic material.Note 4: NZ CAA AD DCA/CRESCO/11 refers. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. Within 150 hours time in service after 15 February 2007 or 1,500 landings on the nose wheel steering pivot pins, unless already accomplished within the last 150 hours time in service. Thereafter inspect at intervals not to exceed 150 hours time in service or 1,500 landings, whichever occurs first.2. Within 300 hours time in service or 3,000 landings after 15 February 2007, unless already accomplished within the last 300 hours time in service. Thereafter inspect at intervals not to exceed 300 hours time in service or 3,000 landings, whichever occurs first.3. Within 150 hours time in service after 15 February 2007 or before exceeding 500 hours time in service on the nose wheel steering pivot pins, whichever occurs later. Thereafter inspect at intervals not to exceed 500 hours time in service.4. Within 150 hours time in service or 1,500 landings, unless already accomplished during the last 6,000 landings. Thereafter inspect at intervals not to exceed 6,000 landings. |\n| | This Airworthiness Directive becomes effective on 15 February 2007. |\n| Background: | The NZ CAA received numerous reports of cracked nose wheel steering pivot pins. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n5 January 2007","sortOrder":0},{"sectionNumber":"AD/CRESCO/11","sectionType":"part","heading":"AD/CRESCO/11","content":"## AD/CRESCO/11","sortOrder":1},{"sectionNumber":"Nose Wheel Steering Assembly","sectionType":"part","heading":"Nose Wheel Steering Assembly","content":"## Nose Wheel Steering Assembly","sortOrder":2},{"sectionNumber":"2/2007","sectionType":"part","heading":"2/2007","content":"## 2/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"No change from the instrument's stated scope is evident in the source. The AD targets Cresco 08‑600 restricted‑category agricultural aircraft fitted with pivot pin P/N 08‑45711‑1 and prescribes specified inspections, magnetic‑particle testing and mandatory repair/replacement intervals and procedures as set out in the PAC Cresco Maintenance Manual."},"complexity_factors":["Technical inspection standards: requires approved direct/indirect magnetic particle inspection equivalent to ASTM E‑1444 (Requirement para 3 and 4).","Multiple specific parts and part numbers referenced (pivot pin P/N 08‑45711‑1; torque link P/N 245235‑2; shimmy damper P/N 08‑45725‑2; steering tube P/N 245207) increasing scope of component checks (Requirement paras 1–4).","Cross‑references to several detailed PAC Cresco Maintenance Manual chapters and tables for procedure, wear limits and adjustment (Requirement paras 1–4).","Differential, overlapping compliance intervals tied to hours and landings (Compliance paras 1–4) create scheduling and record‑keeping complexity for operators.","Mandate to accomplish replacements or adjustments 'before further flight' creates immediate operational and cost implications (Requirement paras 1–4).","Applicability is limited to restricted‑category agricultural operations but depends on fitting of a particular part number, requiring parts‑level fleet checks (Applicability).","Notes impose investigative duties after pilot shimmy incidents and provide assembly/alignment guidance (Notes 1–3), adding procedural obligations.","Reference to an external authority (NZ CAA AD DCA/CRESCO/11) and an effective date (15 February 2007) affect coordination and timing (Notes; Compliance end)."],"plain_english_summary":"**What it does:** Requires inspection, removal and magnetic-particle testing of the nose‑wheel steering pivot pin and related steering parts on specified Cresco 08‑600 agricultural aircraft; cracked or worn parts must be repaired or replaced before further flight. \n\n**Who it affects and why it matters:** Owners/operators of restricted‑category Cresco 08‑600s fitted with pivot pin P/N 08‑45711‑1 must follow PAC Cresco Maintenance Manual procedures and recurring inspection intervals, bearing the cost, downtime and compliance burden after reports of cracked pivot pins."},"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":4,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive focused specifically on nose wheel steering safety. It has not expanded beyond its original purpose of addressing cracked pivot pin reports. The scope remains tightly constrained to inspection and replacement requirements for the identified components."},"complexity_factors":["Multiple compliance timelines with 'whichever occurs first/later' conditional logic (4 different intervals across 4 requirements)","Extensive cross-referencing to external maintenance manual chapters (Chapter 05-10-00, 32-20-00, 32-50-00, etc.) without reproducing those standards in the AD itself","Technical aviation terminology requiring specialist knowledge (magnetic particle inspection, shimmy damper, torque links, ASTM E-1444 standard)","Nested conditional triggers ('unless already accomplished within...') creating calculation burden for operators","Specific part number dependencies (P/N 08-45711-1, 245235-2, etc.) requiring parts catalog cross-checks","Reference to foreign aviation authority (NZ CAA) indicating trans-Tasman regulatory coordination"],"plain_english_summary":"This AD requires owners/operators and maintenance personnel of Pacific Aerospace Cresco 08‑600 agricultural aircraft to inspect and, if necessary, repair or replace nose‑wheel steering components—notably the pivot pin and related parts—because cracking or wear can cause steering failure or violent shimmy. It mandates periodic functional checks and magnetic particle inspections at specified flight‑hour/landing intervals. The rule responds to multiple NZ reports and aims to prevent loss of directional control, runway excursions, or accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly","history":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly/history","analysis":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly/analysis","conflicts":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly/conflicts","importantCases":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly/important-cases","documents":"/api/acts/ad-cresco-11-nose-wheel-steering-assembly/documents"}}