{"id":"F2010L03193","name":"AD/AT 600/1 Amdt 1 - Airframe Life Limits","slug":"ad-at-600-1-amdt-1-airframe-life-limits","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":85386,"registerId":"commonwealth-F2010L03193-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Airtractor 600 Series Aeroplanes","sectionType":"division","heading":"Airtractor 600 Series Aeroplanes","content":"### Airtractor 600 Series Aeroplanes\n\n| AD/AT 600/1 Amdt 1 | Airframe Life Limits | 25/2010 |\n| ------------------ | -------------------- | ------- |\n\n```html\n

Applicability:

All Models.

Requirement:

Retire from service the airframe components listed in the Retirement Schedule below.

RETIREMENT SCHEDULE

Component

Part No.

Retirement Life
(Flight Hours)

L/H Lower Spar Cap in Wing

20603-1

6500

R/H Lower Spar Cap in Wing

20603-2

6500

Wing Attach Block on Lower Cap

20602-1

6500

Wing Attach Block on Lower Cap

20602-2

6500

Plate Assy. - Fin Front Spar Attach

30511-1

As per the Airworthiness Limitations Section approved by the FAA in the Owners Manual

Spar Assy. - Fin Rear

30315-1

As per the Airworthiness Limitations Section approved by the FAA in the Owners Manual

Spring - Main Landing Gear Leg (including the forward and aft main gear clamp block bolts and the inboard main gear large bolt).

40086-4

3000 hours or 8000 landings, whichever occurs first

Spring - Tail Landing Gear Leg

40092-4

3000 hours or 8000 landings, whichever occurs first

Where the total number of landings during a period of service has not been recorded, three landings per one hour time in service must be assumed.

\n```\n\n| Compliance: | Retire prior to exceeding the applicable time in service listed in the Retirement Schedule. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Note: The Type Certificate Data Sheet states that the lives are listed in the Maintenance Manual; however they are in fact listed in the Owners Manual.This Airworthiness Directive becomes effective on 21 December 2010. |\n| Background: | The initial issue of this Directive was to formally promulgate the airframe components life limitations determined by the manufacturer.This amendment revises the retirement lives for two components (Plate Assy - Fin Front Spar Attach and Spar Assy - Fin rear) and corrects a part number. |\n\n![](image.001.png)\n\nMike Higgins \nDelegate of the Civil Aviation Safety Authority\n\n6 December 2010","sortOrder":0},{"sectionNumber":"AD/AT 600/1 Amdt 1","sectionType":"part","heading":"AD/AT 600/1 Amdt 1","content":"## AD/AT 600/1 Amdt 1","sortOrder":1},{"sectionNumber":"Airframe Life Limits","sectionType":"part","heading":"Airframe Life Limits","content":"## Airframe Life Limits","sortOrder":2},{"sectionNumber":"25/2010","sectionType":"part","heading":"25/2010","content":"## 25/2010","sortOrder":3}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The amendment revises the retirement lives for two components (Plate Assy. - Fin Front Spar Attach and Spar Assy. - Fin Rear) and corrects a part number; it otherwise retains the original requirement that listed components be retired per the Retirement Schedule and applies to all models (Background; Applicability; Requirement)."},"complexity_factors":["Component‑specific fixed retirement lives, requiring part‑level tracking (Retirement Schedule)","Mixed limits expressed in flight hours and/or landings (e.g. 3000 hours or 8000 landings) increasing record‑keeping complexity (Retirement Schedule)","Assumption rule when landings are unrecorded (three landings per flight hour) imposes a conservative accounting method (note under table)","Some components' lives are determined by an external source (Airworthiness Limitations Section approved by FAA in Owners Manual) creating cross‑reference dependence (Retirement Schedule entries for fin components)","Amendment revises specific lives and corrects a part number, requiring operators to update records and maintenance planning (Background)","Applies to all Airtractor 600 models — broad applicability but limited to listed components (Applicability)"],"plain_english_summary":"This Airworthiness Directive requires operators of Airtractor 600‑series aircraft to retire specific airframe components once they reach the life limits listed in the Retirement Schedule. Operators must remove parts before exceeding the listed flight hours or landings; two fin‑spar parts' retirement lives were revised and a part number corrected in this amendment (Background). CASA (Delegate) enforces compliance; operators pay for replacements and must keep time‑in‑service and landing records (Compliance; assumed‑landings rule)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: setting mandatory retirement lives for specific airframe components on Airtractor 600 series aircraft. The changes from the initial issue are minor technical corrections (updating two component retirement specifications and fixing a part number) rather than scope expansion."},"complexity_factors":["Single, clearly defined applicability (all Airtractor 600 series models)","Straightforward tabular format with only 8 components listed","Simple compliance trigger: retire before exceeding hours/landings","Only one conditional calculation (3 landings per hour assumption if unrecorded)","No cross-references to other legislation or complex defined terms","Background and rationale clearly stated in plain language"],"plain_english_summary":"This Airworthiness Directive mandates fixed retirement (\"use-by\") limits for key structural and landing-gear components on Airtractor 600 series agricultural aeroplanes, forcing owners and maintenance teams to replace parts before fatigue risk becomes unsafe. It affects operators, pilots and engineers who must track component lives (with a conservative landing-per-hour fallback).\n\nThis amendment updates retirement rules for two tail components and corrects a part-number error."}},"importantCases":[],"_links":{"self":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits","history":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits/history","analysis":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits/analysis","conflicts":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits/conflicts","importantCases":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits/important-cases","documents":"/api/acts/ad-at-600-1-amdt-1-airframe-life-limits/documents"}}