{"id":"F2009L02183","name":"AD/BEA 121/10 - Rudder Drain Hole - CANCELLED","slug":"ad-bea-121-10-rudder-drain-hole-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140352,"registerId":"commonwealth-F2009L02183-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beagle B121 (Pup) Series Aeroplanes","sectionType":"division","heading":"Beagle B121 (Pup) Series Aeroplanes","content":"### Beagle B121 (Pup) Series Aeroplanes\n\n| AD/BEA 121/10 | Rudder Drain Hole | 7/2009 |\n| ------------- | ----------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                                                              |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 2 July 2009.                                                                                                                                                                                                                                                                                                    |\n| Background:  | This AD, raised in 1972, required a modification to ensure satisfactory drainage of moisture within the rudder by providing a suitable drain hole in the lower rudder area. Compliance was required within 100 hours TIS after 28 April 1972.As all affected aircraft would have been modified long ago, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n18 May 2009","sortOrder":0},{"sectionNumber":"AD/BEA 121/10","sectionType":"part","heading":"AD/BEA 121/10","content":"## AD/BEA 121/10","sortOrder":1},{"sectionNumber":"Rudder Drain Hole","sectionType":"part","heading":"Rudder Drain Hole","content":"## Rudder Drain Hole","sortOrder":2},{"sectionNumber":"7/2009","sectionType":"part","heading":"7/2009","content":"## 7/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1329},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the operation of Airworthiness Directive AD/BEA 121/10. It does not expand, restrict, or alter the substantive scope of the original directive; it simply removes obsolete requirements that have been universally complied with for over 35 years."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretive provisions","No conditional logic, exceptions, or cross-references to other legislation","Document consists entirely of historical context and a single declarative statement"],"plain_english_summary":"**What this does:** Cancels an old aircraft safety rule that is no longer needed.\n\n**The old rule:** Since 1972, owners of Beagle B121 (Pup) aeroplanes had to drill a drain hole in the bottom of the rudder to let moisture escape and prevent corrosion or damage.\n\n**What changes:** The rule is completely cancelled as of 2 July 2009.\n\n**Why it matters:** Aircraft owners and maintenance engineers no longer need to check or comply with this specific directive. The cancellation recognises that every affected plane was modified decades ago (the original deadline was 100 flying hours after April 1972), making the rule redundant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled","history":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled/history","analysis":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled/analysis","conflicts":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled/conflicts","importantCases":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled/important-cases","documents":"/api/acts/ad-bea-121-10-rudder-drain-hole-cancelled/documents"}}