{"id":"F2006B02649","name":"AD/B727/127 Amdt 1 - Aft Cargo Compartment Corrosion","slug":"ad-b727-127-amdt-1-aft-cargo-compartment-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41965,"registerId":"commonwealth-F2006B02649-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/127 Amdt 1 - Aft Cargo Compartment Corrosion","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)  \nBoeing 727 Series Aeroplanes\n\nAD/B727/127\n\nAmdt 1\n\n  \nAft Cargo Compartment Corrosion 2/93\n\nApplicability: Model 727-100 and \\-100C series.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 92-19-10 Amdt 39-8368.\n\nNote: Boeing SB 727-53-0085 Revision 3 and Revision 4 refer.\n\nCompliance: As specified in the Requirement Document. The compliance of the previous issue of this Directive remains unchanged. This Amendment is effective from 4 February 1993.\n\nBackground: This Directive was prompted by reports to the FAA of corrosion in the cold bonded skin, doubler and triplets in the skin panels beneath the aft cargo compartment floor. Amendment 1 is issued in response to a new FAA AD which expands the applicability to include all Model 727-100 and -100C aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the applicability of the Directive to include all Model 727-100 and 727-100C aircraft. The underlying technical requirement remains the FAA AD referenced; the Amendment changes who must comply, not the procedural steps to be followed. (Background; Applicability; Requirement)"},"complexity_factors":["Short, narrowly targeted directive with a single clear technical requirement (Requirement).","Relies on an external document (FAA AD 92-19-10 Amdt 39-8368) for the substantive procedures, adding a cross-reference dependency (Requirement).","References to manufacturer service information (Boeing SB 727-53-0085 Rev 3 & 4) require users to consult multiple documents for full technical detail (Note).","Applicability expansion in the Amendment broadens affected parties but does not add procedural complexity (Background; Applicability).","Compliance statement preserves earlier compliance and sets an effective date, creating a limited temporal/legal administrative detail (Compliance)."],"plain_english_summary":"This AD makes compliance with FAA AD 92-19-10 (and related Boeing Service Bulletin 727-53-0085 Revs 3–4) mandatory for Boeing 727-100 and 727-100C aeroplanes to address corrosion beneath the aft cargo compartment floor. Owners/operators and maintenance organisations must carry out inspections and corrective work per the referenced documents.\n\nIt shifts inspection/repair costs and downtime to operators while extending the safety requirement to all affected 727-100/-100C aircraft (effective 4 February 1993)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive (issued as 2/93) was prompted by corrosion reports and applied to a limited subset of aircraft. Amendment 1 explicitly expands the applicability to include ALL Model 727-100 and 727-100C aircraft, significantly broadening the scope beyond the original intent in response to new information from the FAA."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined structural elements (model applicability, specific Boeing Service Bulletin references, FAA AD reference)","No nested conditional logic or exceptions","Single compliance pathway: follow the referenced FAA AD","No cross-references to other Australian legislation beyond the enabling Civil Aviation Regulations 1998","Technical content is entirely delegated to external documents (FAA AD and Boeing Service Bulletin)"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft.\n\n**What it does:**\n- Requires owners and operators of **Boeing 727-100 and 727-100C aircraft** to inspect and address **corrosion problems** in the rear cargo hold\n- Specifically targets corrosion in the \"cold bonded\" metal panels (a type of adhesive bonding used instead of rivets) beneath the floor of the aft cargo compartment\n\n**Who it affects:**\n- Airlines and operators flying Boeing 727-100 and 727-100C series aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- Corrosion in structural components can weaken the aircraft's frame, potentially compromising safety\n- The directive makes compliance **legally mandatory** — operators cannot choose to ignore this maintenance\n- This amendment expands the original directive to cover **all** Model 727-100 and 727-100C aircraft, not just a subset\n\n**Key details:**\n- Operators must follow the technical requirements set out in **FAA AD 92-19-10** (the US aviation safety regulator's equivalent order)\n- Boeing Service Bulletin 727-53-0085 (Revisions 3 and 4) provides the technical instructions\n- The amendment took effect on **4 February 1993**"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion","history":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion/history","analysis":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion/analysis","conflicts":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion/conflicts","importantCases":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion/important-cases","documents":"/api/acts/ad-b727-127-amdt-1-aft-cargo-compartment-corrosion/documents"}}