{"id":"F2021L01224","name":"AD/REC/3 Amdt 1 Sundstrand Cockpit Voice Recorders - Modification","slug":"ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":102059,"registerId":"commonwealth-F2021L01224-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cockpit Voice and Flight Data Recording ","sectionType":"part","heading":"Cockpit Voice and Flight Data Recording Systems","content":"# Cockpit Voice and Flight Data Recording Systems\n\n| AD/REC/3 Amdt 1 | Sundstrand Cockpit VoiceRecorders - Modification | 18/2021 |\n| --------------- | ------------------------------------------------ | ------- |\n\n| Applicability: | Sundstrand Data Control Cockpit Voice Recorder Models AV-557, AV-557A, AV‑557B and AV-557C.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Modify the applicable Sundstrand Data Control Cockpit Voice Recorder Models in accordance with the technical requirements of:1. Sundstrand Data Control Service Bulletin (SB) No. 012-0296-109, as in force from time to time, for part numbers 980-6005-054 to -058 inclusive and 980‑6005-074 to -078 inclusive, and2. Sundstrand Data Control SB No. 012-0129-113, as in force from time to time, for part numbers 980-6005-010 to -013 inclusive, 980- 6005-020 to -023 inclusive, 980-6005-050 to -053 inclusive and 680-6005-060 to -063 inclusive.Note 1: The words “as in force from time to time” require compliance with the most recent version of the referenced document.Note 2: FAA Airworthiness Directive 83-16-01 Amendment 39-4075 is the basis of this AD. |\n| Compliance:    | Within 60 days after the commencement date of this AD, unless previously accomplished in accordance with a previous issue of this AD.Note 3: This Directive was originally issued as AD/RAD/42. Prior compliance with AD/RAD/42 is considered compliance with this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| Commencement:  | This AD commences on 10 September 2021.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | Under conditions of vibration, connectors with split-ring sockets may cause CVRs to operate intermittently, give erroneous self test indications and contribute to sensor or tape-off-reel problems. Replacements are full ring sockets.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n\n|     | Amendment 1 of this AD removes obsolete references and makes minor editorial changes to reflect current requirements |\n| --- | -------------------------------------------------------------------------------------------------------------------- |\n\n![Text\nDescription automatically generated](image.001.jpeg)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n27 August 2021","sortOrder":0},{"sectionNumber":"AD/REC/3 Amdt 1","sectionType":"part","heading":"AD/REC/3 Amdt 1","content":"## AD/REC/3 Amdt 1","sortOrder":1},{"sectionNumber":"Sundstrand Cockpit VoiceRecorders - Modi","sectionType":"part","heading":"Sundstrand Cockpit VoiceRecorders - Modification","content":"## Sundstrand Cockpit Voice  \nRecorders - Modification","sortOrder":2},{"sectionNumber":"18/2021","sectionType":"part","heading":"18/2021","content":"## 18/2021","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 1 removed obsolete references and made minor editorial changes without expanding or narrowing the set of affected CVR models or the required modification. The core requirement—modification per specified Sundstrand Service Bulletins within 60 days of 10 September 2021—remains as originally issued; prior compliance with AD/RAD/42 is still accepted (Amendment note; Requirement; Compliance; Note 3)."},"complexity_factors":["Technical specificity: identifies particular CVR models and many part numbers requiring targeted hardware changes (Applicability; Requirement).","Cross‑reference/version control: mandates compliance with the latest editions of two Sundstrand Service Bulletins (“as in force from time to time”), creating an ongoing document‑control obligation (Requirement; Note 1).","Short compliance window: 60 days from commencement shifts scheduling pressure onto operators and maintenance providers (Compliance; Commencement).","Compliance recognition: prior compliance with AD/RAD/42 is accepted, which adds a legacy‑compliance consideration (Compliance; Note 3).","Limited administrative discretion: amendment removes obsolete references and makes editorial changes but does not expand applicability, reducing regulatory ambiguity (Amendment note).","Implementation risk: modification likely requires certified maintenance actions and parts supply coordination, affecting operational availability (implied by Requirement and Background)."],"plain_english_summary":"This directive requires owners/operators of aircraft fitted with Sundstrand cockpit voice recorder models AV-557, AV-557A, AV-557B and AV-557C to modify those units by installing full‑ring sockets in accordance with specified Sundstrand Service Bulletins, with work to be done within 60 days of 10 September 2021. The stated purpose is to prevent intermittent CVR operation caused by split‑ring sockets under vibration (Background). It therefore creates a short, operator‑borne maintenance cost and a duty to comply with the latest version of the referenced service bulletins."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment explicitly states it 'removes obsolete references and makes minor editorial changes to reflect current requirements.' The scope remains tightly focused on the original safety issue (vibration-induced connector failures in specific Sundstrand CVR models) and does not expand to new aircraft types, recorder models, or failure modes."},"complexity_factors":["Multiple cross-references to external technical documents (Sundstrand Service Bulletins 012-0296-109 and 012-0129-113)","Extensive part number ranges requiring careful matching (e.g., '980-6005-054 to -058 inclusive')","Conditional compliance language ('unless previously accomplished in accordance with a previous issue of this AD')","Incorporation by reference to 'as in force from time to time' creates dynamic obligations that change without legislative amendment","Nested applicability criteria combining model numbers with specific part number ranges"],"plain_english_summary":"This CASA Airworthiness Directive mandates that operators/owners of aircraft fitted with Sundstrand cockpit voice recorders (models AV-557, AV-557A, AV-557B, AV-557C) replace defective split‑ring connector sockets with full‑ring sockets per the manufacturer service instructions. Compliance was required within 60 days of 10 September 2021. The fix prevents vibration-induced CVR failures so critical cockpit audio is preserved for accident investigation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification","history":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification/history","analysis":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification/analysis","conflicts":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification/conflicts","importantCases":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification/important-cases","documents":"/api/acts/ad-rec-3-amdt-1-sundstrand-cockpit-voice-recorders-modification/documents"}}