{"id":"F2006B08204","name":"AD/CESSNA 320/25 - Wing Tip Strobe Light - Inspection","slug":"ad-cessna-320-25-wing-tip-strobe-light-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115419,"registerId":"commonwealth-F2006B08204-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 320/25 - Wing Tip Strobe Light - Inspection","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)  \nCessna 320 Series Aeroplanes\n\nAD/CESSNA 320/25 Wing Tip Strobe Light \\- Inspection 7/76\n\nApplicability: All models equipped with strobe lights installed in wing tip fuel tank nose cap except those aeroplanes having Symbolic displays P/N 30-0005, 30-0199-3 and 701133-1; Whelen Engineering Co. Inc. P/N A430; and Grimes Manufacturing Co. P/N 30- 0515-5, 30-1172-1, 30-0531-1 and 30-0467-5 strobe lights.\n\nRequirement: 1. Deactivate the strobe light system by installing a guard over the switch and/or by pulling and locking the circuit breaker so that it cannot be inadvertently reset, or by any other suitable means.\n\n    2. Systems having Grimes P/N 30-0515-1 strobe lights may be reactivated upon the installation of Grimes P/N 31-1723-5 or 30-1171-1 cover plates in accordance with Cessna SL ME75-16. These cover plates may be identified by the presence of two quench tubes protruding into the light assembly from the end plate.\n\n    3. Do not reactivate other non excepted strobe light assemblies until data, showing that the strobe lights are explosion proof has been submitted to and approved by the Secretary.\n\nCompliance: Within 100 hours time in service after 30 July 1976.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive sets out deactivation and limited reactivation rules for wing-tip strobe lights on Cessna 320-series aircraft and lists specific exceptions. The text does not indicate any change to that scope beyond those listed exceptions and the reactivation routes described."},"complexity_factors":["Applicability hinges on specific part-number exceptions — requires identification of installed strobe P/Ns to determine whether aircraft are affected (Applicability).","Multiple compliance options for deactivation (guard over switch, pulled/locked circuit breaker, or ‘any other suitable means’) create interpretive discretion for operators and inspectors (Requirement 1).","Limited reactivation route for Grimes P/N 30-0515-1 contingent on installing particular cover plates and following Cessna SL ME75-16; cover plates identified by a physical feature (two quench tubes) which requires physical inspection (Requirement 2).","All other non-excepted strobe assemblies may only be reactivated after submission and approval of data showing explosion‑proof characteristics, putting evidentiary burden on operators/manufacturers and giving approval discretion to the Secretary (Requirement 3).","Short, fixed compliance window tied to a historical date (100 hours after 30 July 1976) imposes a time-bound operational and administrative burden (Compliance).","Enforcement and technical judgement points (what counts as a ‘suitable means’, sufficiency of submission data, and identification of parts) concentrate decision authority with regulators and create potential for inconsistent application."],"plain_english_summary":"Requires owners/operators of Cessna 320-series aeroplanes with wing-tip strobe lights (except certain listed part numbers) to deactivate those strobe systems within 100 flight hours after 30 July 1976 by fitting a guard, locking the circuit breaker, or using another suitable means. Some Grimes strobe units may be reactivated after fitting specified cover plates per Cessna service literature; all other reactivations require the Secretary’s approved evidence that the lights are explosion‑proof."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1976 addressing a specific mechanical defect. It has not expanded beyond its original purpose of grounding/restricting specific strobe light installations pending safety modifications."},"complexity_factors":["Single discrete safety issue with clear mechanical remedy","Limited applicability exceptions (7 specific part numbers exempted)","Straightforward three-step compliance structure","Single deadline with objective measurement (flight hours)","No nested definitions or cross-references to other legislation","Minimal conditional logic (only two reactivation pathways)","Short document length (approximately 200 words)"],"plain_english_summary":"CASA orders owners and operators of Cessna 320 series aeroplanes to inspect and deactivate wing‑tip strobe lights located in fuel tank nose caps because of a risk of fire/explosion. Certain approved part numbers are exempt or may be reactivated after installing specified approved cover plates; all other affected lights must remain deactivated until shown to be explosion‑proof and approved by CASA.\n\nThis action prevents potential fuel‑tank ignition from heat or electrical sparks; compliance deadline: within 100 flight hours after 30 July 1976."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection","history":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection/history","analysis":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection/analysis","conflicts":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection/conflicts","importantCases":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection/important-cases","documents":"/api/acts/ad-cessna-320-25-wing-tip-strobe-light-inspection/documents"}}