{"id":"F2006B03934","name":"AD/BEECH 400/7 - Wheel Speed Transducer Drive Clip","slug":"ad-beech-400-7-wheel-speed-transducer-drive-clip","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43543,"registerId":"commonwealth-F2006B03934-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 400/7 - Wheel Speed Transducer Drive Clip","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)  \nBeechcraft 400 Series Aeroplanes\n\nAD/BEECH 400/7 Wheel Speed Transducer Drive Clip 6/94\n\nDM\n\nApplicability: Model 400A aircraft with serial numbers RK-1 through RK-23, on which Beechcraft Kit No. 128-8001-1S (increased landing weight modification) is installed; and aircraft with serial numbers RK-24 through RK-76.\n\nRequirement: 1. Replace the existing left and right hand hubcaps on the main landing gear with new hubcaps, part number 140-03121-1; or rework the existing hubcaps by adding a spacer between the hubcap drive clip and the hubcap and reidentifying the hubcap assembly as part number 140-03121-1; in accordance with Beechcraft Service Bulletin 2549.\n\n2. Incorporate into the System of Maintenance for the aircraft, the procedure described in Beechcraft Service Bulletin 2549; for inspecting the transducer drive clip to ensure that the drive clip gap does not exceed 0.20 inch (5 mm), which must be accomplished each time a hubcap is removed.\n\nNote 1: FAA AD 94-04-07 Amdt 39-8827 refers.\n\nNote 2: Requirement 2 of this Directive will require approval in accordance with CAR 42M.\n\nCompliance: Within 25 hours’ time in service after 27 April 1994, or prior to 27 May 1994, whichever occurs first.\n\nBackground: The FAA received a report that a Beech 400A aircraft lost its anti-skid braking system during landing roll out. Tests and inspections of the brakes and anti-skid system have revealed that only marginal engagement may occur between the main wheel hubcap drive clip and the anti-skid wheel speed transducer.","sortOrder":0}],"analysis":{"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 a limited fleet of aircraft. It has not expanded beyond its original purpose of ensuring proper engagement between wheel hubcap drive clips and anti-skid transducers."},"complexity_factors":["Single, specific aircraft model and limited serial number range","Only two substantive requirements (physical modification + maintenance procedure update)","Clear, unambiguous compliance deadline","Minimal defined terms (only standard aviation terminology like 'time in service')","No nested exceptions or conditional logic","Short document (approximately 250 words)","Single cross-reference to FAA AD and CAR 42M (maintenance approval regulation) in notes only"],"plain_english_summary":"This CASA Airworthiness Directive mandates a retrofit and inspection for Beechcraft 400A jets (SN RK‑1–RK‑23 with a certain weight‑upgrade kit, and RK‑24–RK‑76) to prevent anti‑skid brake failures caused by improperly engaging hubcap drive clips. Operators must install an improved hubcap/spacer design and add a maintenance check of the clip gap. Compliance is required within 25 flight hours after 27 April 1994 or by 27 May 1994."},"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":3,"scope_assessment":{"changed":false,"description":"The directive targets a specific fault mode on a defined subset of Beech 400A aircraft (serial RK‑1–RK‑76 and RK‑1–RK‑23 with the increased landing-weight kit). The text does not expand scope beyond that affected fleet; it addresses the reported anti‑skid engagement issue by mandating a physical fix and an inspection procedure."},"complexity_factors":["Technical specificity: precise mechanical tolerance required (drive-clip gap ≤0.20 inch / 5 mm) (Requirement 2).","Two alternative technical fixes: replace hubcaps with P/N 140-03121-1 or rework existing hubcaps by adding a spacer and reidentify (Requirement 1).","Limited applicability by serial number and retrofit kit condition (Applicability), requiring operators to determine fleet coverage.","Short compliance window (25 flight hours or by a calendar date) increases logistical pressure to source parts and schedule work (Compliance).","Maintenance-system change requires regulatory approval under CAR 42M (Note 2), adding procedural administrative burden and potential delay.","Inspection obligation triggers each time a hubcap is removed (Requirement 2), creating recurring operational compliance tasks.","Cross-reference to FAA AD adds an external regulatory linkage (Note 1 / Background)."],"plain_english_summary":"This airworthiness directive requires replacing or reworking the main landing-gear hubcaps so the wheel-speed transducer drive clip engages correctly (new or reworked hubcap P/N 140‑03121‑1), and adding a maintenance procedure to inspect the drive-clip gap (≤0.20 inch / 5 mm) each time a hubcap is removed. It applies to Beech 400A serials RK‑1–RK‑76 (including RK‑1–RK‑23 with the increased landing-weight kit).\n\nCompliance is within 25 flight hours after 27 April 1994 or by 27 May 1994. The AD responds to a reported loss of anti-skid braking and aims to prevent marginal engagement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip","history":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip/history","analysis":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip/analysis","conflicts":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip/conflicts","importantCases":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip/important-cases","documents":"/api/acts/ad-beech-400-7-wheel-speed-transducer-drive-clip/documents"}}