{"id":"F2009L03752","name":"AD/F27/38 - ADF Sense Antenna - Modification - CANCELLED","slug":"ad-f27-38-adf-sense-antenna-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141614,"registerId":"commonwealth-F2009L03752-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fokker F27 Series Aeroplanes","sectionType":"division","heading":"Fokker F27 Series Aeroplanes","content":"### Fokker F27 Series Aeroplanes\n\n| AD/F27/38 | ADF Sense Antenna - Modification | 11/2009 |\n| --------- | -------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                                     |\n| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 22 October 2009.                                                                                                                                                                                                                                                                                                       |\n| Background:  | This unique Australian AD raised in 1967 required a modification to Bendix type DFA-70A ADF equipment to achieve certain minimum performance characteristics.Compliance not stated.This AD has been sufficiently promulgated for the affected aircraft to have been modified by now; therefore this AD is considered to be no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n10 September 2009","sortOrder":0},{"sectionNumber":"AD/F27/38","sectionType":"part","heading":"AD/F27/38","content":"## AD/F27/38","sortOrder":1},{"sectionNumber":"ADF Sense Antenna - Modification","sectionType":"part","heading":"ADF Sense Antenna - Modification","content":"## ADF Sense Antenna - Modification","sortOrder":2},{"sectionNumber":"11/2009","sectionType":"part","heading":"11/2009","content":"## 11/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1454},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument does not expand or alter the scope of the original 1967 Airworthiness Directive; it simply terminates it. The original scope was limited to Fokker F27 aircraft with specific Bendix ADF equipment, and this cancellation applies only to that same limited cohort."},"complexity_factors":["Single operative provision (cancellation of a previous directive)","No defined terms or interpretation sections","No conditional logic, exceptions, or procedural requirements","Historical background only, no substantive regulatory content"],"plain_english_summary":"**What this is:** This document officially scraps an old aviation safety rule from 1967 that required modifications to radio equipment on Fokker F27 aircraft.\n\n**The backstory:** In 1967, the aviation safety regulator ordered owners of Fokker F27 aeroplanes to modify their Automatic Direction Finder (ADF) units (specifically Bendix DFA-70A models) to meet certain performance standards. This equipment helps pilots determine their direction using radio signals.\n\n**What changed:** The old rule is cancelled effective 22 October 2009. \n\n**Why:** After 42 years, the regulator assumes every affected aircraft has either been modified or retired, so the rule is no longer needed.\n\n**Who cares:** Primarily aviation historians and Fokker F27 operators who need to confirm their compliance records are complete. No action is required—this is simply housekeeping to remove obsolete rules from the books."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled","history":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled/history","analysis":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled/analysis","conflicts":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled/conflicts","importantCases":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled/important-cases","documents":"/api/acts/ad-f27-38-adf-sense-antenna-modification-cancelled/documents"}}