{"id":"F2006B02680","name":"AD/B727/158 - Main Cargo Deck Floor Beams","slug":"ad-b727-158-main-cargo-deck-floor-beams","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41996,"registerId":"commonwealth-F2006B02680-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/158 - Main Cargo Deck Floor Beams","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/B727/158 Main Cargo Deck Floor Beams 3/99\n\nApplicability: Model 727 series aircraft that have been converted from a passenger to a cargo- carrying (“freighter”) configuration in accordance with Supplemental Type Certificate (STC) SA1368SO, SA1797SO, or SA1798SO.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 98-26-19 Amdt 39-10962.\n\nRevise the Limitations Sections of the Aircraft Flight Manual (AFM) and AFM Supplements to include the Flight Manual information specified in FAA AD 98-26-19 Amdt 39-10962. This task may be accomplished by inserting a copy of the FAA AD in the AFM and AFM Supplements.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 25 March 1999.\n\nThis Airworthiness Directive becomes effective on 25 March 1999.\n\nBackground: The FAA has determined that under certain conditions unreinforced floor structure of the main cargo deck is not strong enough to enable the aircraft to safely carry the maximum payload that is currently allowed in this area. The actions specified by this Directive are intended to prevent failure of the floor structure, which could lead to loss of the aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose. It addresses exactly what it sets out to address: floor beam strength limitations in specific converted aircraft. No scope creep is evident."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined terms (STC numbers referenced)","Single, straightforward requirement with clear compliance method","No nested exceptions or conditional logic","Cross-reference to only one external document (FAA AD 98-26-19)","Background provides clear rationale without legal complexity"],"plain_english_summary":"This safety order requires owners/operators of Boeing 727s converted from passenger to freighter under STCs SA1368SO, SA1797SO, or SA1798SO to revise their Aircraft Flight Manuals with reduced main-deck weight limits. The change addresses inadequate floor strength in these specific conversions to prevent structural failure and potential loss of the aircraft. Compliance is met by inserting FAA AD 98-26-19 into the AFM by 25 March 1999."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument adopts the FAA's specified Flight Manual amendments for the same subset of converted 727 freighters and confines action to AFM/AFM supplement revisions. It does not expand applicability or impose additional technical inspections beyond incorporating the FAA AD information (Applicability; Requirement; Background)."},"complexity_factors":["Cross-reference to an external FAA AD for technical content and required Flight Manual wording (Requirement and Background).","Limited but precise applicability: only 727s converted under STC SA1368SO, SA1797SO or SA1798SO must comply (Applicability).","Administrative compliance task: revising AFM and AFM supplements or inserting the FAA AD copy (Requirement), which is straightforward but requires operator action and record updates.","Operational impact: potential changes to allowed payload or operating limits that affect commercial decisions by operators (Background).","Compliance timing is tied to a Requirement Document and an effective date (Compliance), creating a fixed deadline for action."],"plain_english_summary":"This directive applies to Boeing 727 aircraft converted to freighters under STCs SA1368SO, SA1797SO or SA1798SO. It requires operators to update the Aircraft Flight Manual (AFM) and AFM supplements to include the Flight Manual information specified in FAA AD 98-26-19 (inserting a copy of that FAA AD is allowed). Operators must comply by 25 March 1999. The change clarifies payload/operating limits to address a risk that unreinforced main cargo-deck floor beams may not safely support previously permitted loads."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams","history":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams/history","analysis":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams/analysis","conflicts":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams/conflicts","importantCases":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams/important-cases","documents":"/api/acts/ad-b727-158-main-cargo-deck-floor-beams/documents"}}