{"id":"F2009L01553","name":"AD/F2000/33 Amdt 1 - Main Landing Gear - Shock Absorber Restrictor","slug":"ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78255,"registerId":"commonwealth-F2009L01553-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dassault Aviation Falcon 2000 Series Aer","sectionType":"division","heading":"Dassault Aviation Falcon 2000 Series Aeroplanes","content":"### Dassault Aviation Falcon 2000 Series Aeroplanes\n\n| AD/F2000/33 Amdt 1 | Main Landing Gear - Shock Absorber Restrictor | 5/2009 |\n| ------------------ | --------------------------------------------- | ------ |\n\n| Applicability: | DASSAULT AVIATION Falcon 2000 aircraft and all Falcon 2000EX aircraft (versions F2000DX and F2000EX EASy inclusive). |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Update the operator’s approved aircraft maintenance programme (MP) to incorporate the applicable version of MP32-000 at revision date 06/2008 or later.2. For MLG shock absorber with 4,200 Landings (LDG) or more, since new or since last overhaul at 15 January 2009 (the effective date of the original issue of this AD), inspect the shock absorber per the accomplishment instructions of SB F2000-366 or F2000EX-167, as applicable to aircraft model.If any damage is found, within the applicable time(s) or LDG limits specified in the relevant SB F2000-366 or F2000EX-167, repair the shock absorber per the accomplishment instructions of SB F2000-367 or F2000EX-185, as applicable to aircraft model.3. For MLG shock absorber with 1,900 LDG or more, since new or since last overhaul at 15 January 2009 and installed on aeroplanes that have performed 6 Steep-approach landings or more, over the last 6 months before 15 January 2009, inspect the shock absorber per the accomplishment instructions of SB F2000-366 or F2000EX-167, as applicable to aircraft model.If any damage is found, within the applicable time(s) or LDG limits specified in the relevant SB F2000-366 or F2000EX-167, repair the shock absorber per the accomplishment instructions of SB F2000-367 or F2000EX-185, as applicable to aircraft model.Note 1: Steep Approach Standard Operating Procedures (SOPs) are found and defined in the Aeroplane Flight Manual (AFM) Appendices as listed in the Reference Publications.4. For MLG shock absorber with 1,900 LDG or more, since new or since last overhaul at 15 January 2009 and installed on aeroplanes that have performed 5 Steep-approach landings or less, over the last 6 months before 15 January 2009, inspect the shock absorber per the accomplishment instructions of SB F2000-366 or F2000EX-167, as applicable to aircraft model. |\n\n```html\n

If any damage is found, within the applicable time(s) or LDG limits specified in the relevant SB F2000-366 or F2000EX-167, repair the shock absorber per the accomplishment instructions of SB F2000-367 or F2000EX-185, as applicable to aircraft model.

5. For MLG shock absorber with less than 1,900 LDG since new or since last overhaul at 15 January 2009, inspect the shock absorber per the accomplishment instructions of SB F2000-366 or F2000EX-167, as applicable to aircraft model.

If any damage is found, within the applicable time(s) or LDG limits specified in the relevant SB F2000-366 or F2000EX-167, repair the shock absorber per the accomplishment instructions of SB F2000-367 or F2000EX-185, as applicable to aircraft model.

Embodiment of SB F2000-367 or F2000EX-185 without previous implementation of SB F2000-366 or F2000EX-167, as applicable to aircraft model, is acceptable to comply with Requirements 2, 3, 4, and 5 of this AD.

6. After accomplishment of Requirements 2, 3, 4 or 5 of this AD, and until further notice, repeat the shock absorber inspections and associated corrective actions per the accomplishment instructions of SB F2000-366 or F2000EX-167, as applicable to aircraft model.

7. Install or modify the LH and RH shock absorbers with P/N suffix as listed in table 1, and embodying M3120.

Table 1. New Part Numbers after modification of shock absorbers per M3120

Post M3120

on F2000 aeroplanes

on F2000EX aeroplanes

LH MLG Shock Absorber

D23365000-4

D23745000-2

RH MLG Shock Absorber

D23366000-4

D23746000-2

Note 2: M3120 can be complied with:

  • As per new production
  • As per Messier Dowty SB D23345-32-019 or D23733-32-004
  • As per DA SB F2000-367 & F2000EX-185

The modification leading to new Part Numbers as indicated in Table 1 terminates the repetitive inspection detailed in Requirement 6 of this AD.

\n```\n\n| | 8. Do not install on any aeroplane, a MLG shock absorber, as a replacement part, which does not have the appropriate part number suffix (e.g. -4..) as given in the above Table 1, as applicable to aircraft model.The use of later approved revisions of these Service Bulletins is acceptable for compliance with the requirements of this AD.Note 3: EASA AD 2009-0050 dated 5 March 2009 refers. This AD supersedes EASA AD 2008-0178. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | For Requirement 1 - Remains unchanged as detailed in the original issue of this AD as: Within 3 months after 15 January 2009, unless previously accomplished.For Requirements 2 and 3 - Remains unchanged as detailed in the original issue of this AD as: Within 8 months after 15 January 2009, unless previously accomplished.For Requirement 4 - Remains unchanged as detailed in the original issue of this AD as: Within 18 months after the 15 January 2009 or before accumulation of 5,000 LDG since new or last overhaul for the MLG shock absorber, whichever occurs first.For Requirement 5 - Before accumulation of 3,000 LDG since new or last overhaul.For Requirement 6 - At intervals not to exceed 1,900 LDG.For Requirement 7 - Before accumulating 6,000 landings or 12 years, since new or since last overhaul, whichever occurs first, and unless previously accomplished.For Requirement 8 - From the effective date of this AD. |\n| | This Amendment becomes effective on 7 May 2009. |\n| Background: | During the overhaul of a MLG of a Falcon 2000, the sleeve on the hydraulic flow restrictor in the shock absorber was found displaced because of the rupture of its three retaining screws. In this situation, the energy dissipation function of the shock absorber is lost and high loads may be transmitted to the aircraft structure during landing. Structural integrity may thus not be guaranteed over the entire certified landing conditions domain particularly in combination of high landing weight and high vertical speed. The failure of the retaining screws has been determined to be the final phase of a slow unscrewing process under normal operational conditions. The unsafe condition only exists once the three screws have failed.This AD requires a repetitive borescope inspection of the flow restriction system and, if necessary, repair of the shock absorber. This AD also mandates the update of the operator's maintenance programme to include a revision of the “Check after Hard Landing” MP calling for borescope inspection. |\n\n| | Amendment 1 introduces a terminating action to the repetitive inspections detailed in the AD. The terminating action is mandatory.The original issue of this AD became effective 15 January 2009. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n27 March 2009","sortOrder":0},{"sectionNumber":"AD/F2000/33 Amdt 1","sectionType":"part","heading":"AD/F2000/33 Amdt 1","content":"## AD/F2000/33 Amdt 1","sortOrder":1},{"sectionNumber":"Main Landing Gear - Shock Absorber Restr","sectionType":"part","heading":"Main Landing Gear - Shock Absorber Restrictor","content":"## Main Landing Gear - Shock Absorber Restrictor","sortOrder":2},{"sectionNumber":"5/2009","sectionType":"part","heading":"5/2009","content":"## 5/2009","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":5,"scope_assessment":{"changed":true,"description":"This Amendment (Amdt 1) introduces a mandatory terminating action (modification M3120 and associated new part numbers) that did not appear as an option in the original issue of the AD. Mechanically, the amendment does not expand the class of affected aircraft but it changes compliance scope by adding (a) a required modification path that, once embodied, stops the repetitive inspections, and (b) an installation prohibition preventing return to older part-number shock absorbers. Those changes alter the long‑run compliance options and the distribution of costs (one‑time modification cost versus recurring inspection/repair costs)."},"complexity_factors":["Multiple conditional inspection thresholds based on accumulated landings: <1,900 LDG, ≥1,900 LDG, and ≥4,200 LDG (Requirements 2–5).","Additional condition based on operational history (number of steep-approach landings in the prior 6 months): ≥6 or ≤5 affects which requirement applies (Requirements 3–4).","Repetitive inspection interval and repeat requirement specified (every 1,900 LDG) until terminating modification embodied (Requirement 6).","Terminating action (modification M3120) that itself changes compliance obligations and creates new part-number suffixes in Table 1 (Requirement 7 and Table 1).","Explicit prohibition on installation of non‑compliant shock absorbers (part numbers without the new suffix) (Requirement 8).","Multiple cross-referenced service bulletins for inspection and repair (SB F2000-366 / F2000EX-167 for inspection; SB F2000-367 / F2000EX-185 for repair) and allowance for later approved revisions.","Alternative acceptable compliance methods for M3120 (new production, Messier-Dowty SBs, or Dassault SBs) increasing conditional paths (Note 2).","Compliance timing windows and multiple numeric deadlines (3 months, 8 months, 18 months/5,000 LDG, before 3,000 LDG, 1,900 LDG interval, before 6,000 LDG or 12 years) (Compliance section).","Reference to an external AD (EASA AD 2009-0050) and supersession of earlier EASA AD (cross-jurisdictional linkage)."],"plain_english_summary":"**What this airworthiness directive (AD) does, in plain English**\n\n- **Applies to:** Owners/operators and maintenance organisations for Dassault Aviation Falcon 2000 and Falcon 2000EX (including F2000DX and F2000EX EASy) aeroplanes.\n\n- **Mechanical changes required:**\n - **Update the operator's maintenance programme** to include the specified revision of the \"Check after Hard Landing\" procedures (MP32-000, revision 06/2008 or later). (Requirement 1)\n - **Inspect main landing gear (MLG) shock absorbers by borescope** according to the relevant Dassault Service Bulletin (SB F2000-366 or F2000EX-167), depending on the shock absorber's accumulated landings and, in some cases, whether the aeroplane performed steep-approach landings. If damage is found, **repair per the applicable repair SB** (SB F2000-367 or F2000EX-185). (Requirements 2–6)\n - **Repeat inspections** at intervals not exceeding 1,900 landings until further notice unless the terminating modification is embodied. (Requirement 6)\n - **Modify or replace** both left-hand and right-hand shock absorbers by embodying modification M3120 (or the equivalent methods listed). After the M3120 modification and the change to the part-number suffix shown in Table 1, the repetitive inspections required above are terminated. (Requirement 7 and Table 1)\n - **Do not install** a replacement MLG shock absorber that does not have the new part-number suffix (for example, \"-4..\") listed in Table 1. (Requirement 8)\n\n- **Why this matters (stated purpose and mechanical risk):**\n - During an overhaul a flow-restrictor sleeve inside an MLG shock absorber was found displaced due to failure of three retaining screws. When that sleeve moves, the shock absorber can lose its energy-dissipation function and transfer high loads to the airframe during landing. The AD's stated goal is to detect the condition early by borescope inspection, repair or replace damaged shock absorbers, and finally terminate repetitive inspections by making a modification that prevents the failure mode. (Background)\n\n- **Who pays and who decides:**\n - The operator/owner pays for inspection labour, possible repairs, and the M3120 modification or replacement parts. Maintenance organisations perform the inspections/repairs per the service bulletins. The regulator (Civil Aviation Safety Authority, via this AD) requires and enforces the actions and timing.\n\n- **Behavioural and market effects (mechanical consequences):**\n - Operators must change their approved maintenance programme and schedule borescope inspections at the specified thresholds and intervals. Some operators will choose to schedule the terminating modification (M3120) to stop recurring inspections. Maintenance workload and parts demand for the specified SBs and the M3120 modification will increase.\n - The AD also restricts what replacement shock absorbers can be installed (only those with the new part-number suffix). That limits acceptable aftermarket substitution to parts that conform to the modification.\n\n- **Implementation details and timing (how and when):**\n - The AD references specific Service Bulletins for inspection and repair methodology; those SBs (and later approved revisions) are the compliance standard. The AD sets landing-count thresholds and steep-approach history conditions that determine which inspection/repair rule applies (see Requirements 2–5). It also sets compliance intervals: the repetitive inspection interval is not to exceed 1,900 landings; the terminating modification must be embodied before accumulating 6,000 landings or 12 years since new or last overhaul, or as otherwise required in the AD. (Compliance section)\n\n- **Practical trade-offs, costs and incentives (analyst note):**\n - The primary safety benefit is reduced risk of losing shock absorber damping and transmitting excessive loads to the structure during landing; the AD achieves this by detection (borescope) + repair or by permanent modification (M3120).\n - Costs to operators include the ongoing borescope inspections (labour, possible aircraft downtime), repairs where damage is found, and the one-off cost of modification M3120 (parts and labour). Operators that want to avoid recurring inspections have a clear incentive to pay for M3120. That creates concentrated demand for the specific SB work and parts suppliers/approved MROs able to perform the modification.\n - Compliance requires updating the approved maintenance programme and recordkeeping. Implementation risk includes availability of parts and qualified shops for the M3120 modification, and the quality/reliability of borescope inspections (risk of missed defects or unnecessary removals from service because of conservative findings).\n - The AD constrains replacement-part choices (you cannot fit an older-part-number shock absorber), which narrows aftermarket substitution to parts that meet the modification standard.\n\n- **Summary of key operative references in the AD:**\n - Requirement 1: update maintenance programme (MP32-000, rev 06/2008 or later).\n - Requirements 2–6: borescope inspections and repair actions, with landing-count and steep-approach conditional rules.\n - Requirement 6: repeat inspections at intervals not to exceed 1,900 landings.\n - Requirement 7 and Table 1: embodiment of M3120 and new part-number suffixes; M3120 terminates repetitive inspections.\n - Requirement 8: prohibition on installing shock absorbers without the new part-number suffix.\n\n(References to specific Service Bulletins and part numbers are the technical compliance paths the AD prescribes; operators must follow those SBs or later approved revisions.)"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The original AD (effective 15 January 2009) mandated repetitive inspections. Amendment 1 adds a terminating action (Requirement 7) that allows operators to permanently fix the problem and stop the repetitive inspections. The scope remains tightly focused on the specific shock absorber defect and does not expand beyond the original safety purpose."},"complexity_factors":["Multiple conditional inspection triggers based on landing counts (LDG) and timeframes (4,200+, 1,900+, <1,900 landings)","Nested conditions combining landing counts with operational history (steep-approach landings in last 6 months)","Cross-references to 6 external service bulletins (SB F2000-366, F2000EX-167, F2000-367, F2000EX-185, plus Messier Dowty SBs D23345-32-019 and D23733-32-004)","Multiple compliance deadlines varying by requirement (3 months, 8 months, 18 months, 1,900 LDG intervals, 3,000 LDG, 6,000 LDG/12 years)","Specific part number suffix requirements in Table 1 with left/right and model-specific variations","Terminating action logic (Requirement 7) that supersedes ongoing inspection requirements (Requirement 6)","Reference to superseded EASA directives (2008-0178, 2009-0050) indicating regulatory lineage"],"plain_english_summary":"This CASA Airworthiness Directive targets Dassault Falcon 2000 series jets to fix a defect where screws on the main landing‑gear shock‑absorber flow restrictor can loosen and cause shock absorber failure. It mandates inspections, repairs, and ongoing checks until modified parts are installed as a terminating action, and bans reinstalling the old design. Compliance prevents landing‑gear collapse or structural damage during landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor","history":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor/history","analysis":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor/analysis","conflicts":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor/conflicts","importantCases":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor/important-cases","documents":"/api/acts/ad-f2000-33-amdt-1-main-landing-gear-shock-absorber-restrictor/documents"}}