{"id":"F2006L02840","name":"AD/B737/295 - Airstair Doorstop Intercostal","slug":"ad-b737-295-airstair-doorstop-intercostal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60073,"registerId":"commonwealth-F2006L02840-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/295 | Airstair Doorstop Intercostal | 10/2006 |\n| ----------- | ----------------------------- | ------- |\n\n| Applicability: | Model 737-700 and 737-800 series aircraft; as identified in Boeing Special Attention Service Bulletin 737-53-1236 Revision 1, dated 10 November 2005, or later FAA approved revision.                                                                                     |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2006-16-11 Amdt 39-14711.                                                                                                                                                                                  |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of28 September 2006.                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 28 September 2006.                                                                                                                                                                                                      |\n| Background:    | The FAA received a report of fatigue cracks of the backup intercostals located above the cutout for the forward airstair door. Such cracking, unless detected and corrected, could result in more extensive fatigue cracking and lead to possible loss of cabin pressure. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n17 August 2006","sortOrder":0},{"sectionNumber":"AD/B737/295","sectionType":"part","heading":"AD/B737/295","content":"## AD/B737/295","sortOrder":1},{"sectionNumber":"Airstair Doorstop Intercostal","sectionType":"part","heading":"Airstair Doorstop Intercostal","content":"## Airstair Doorstop Intercostal","sortOrder":2},{"sectionNumber":"10/2006","sectionType":"part","heading":"10/2006","content":"## 10/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive adopts the actions required by FAA AD 2006-16-11 for the same Boeing 737-700/800 population and does not expand affected models or corrective tasks. The only modification recorded in this instrument is a revised effective date of 28 September 2006 (Compliance)."},"complexity_factors":["References and requires compliance with an external FAA Airworthiness Directive (FAA AD 2006-16-11) rather than reproducing full technical steps (Requirement).","Relies on a Boeing service bulletin for applicability details and affected serials, so users must obtain and follow that external document (Applicability).","Technical, engineering tasks (inspections/repairs for fatigue cracking) require specialist maintenance facilities and certified personnel (Background / Requirement).","Fixed compliance timetable (revised effective date 28 September 2006) creates scheduling and logistic constraints for operators (Compliance).","Regulatory enforcement by CASA and delegated authority introduces administrative compliance and record-keeping obligations (signature/delegate entry)."],"plain_english_summary":"**What it does:** Requires operators of Boeing 737-700 and 737-800 aeroplanes (as listed in Boeing Special Attention Service Bulletin 737-53-1236 Rev 1) to carry out the inspections and corrective actions set out in FAA Airworthiness Directive 2006-16-11 for fatigue cracking around the forward airstair door. Compliance is mandatory, with this Directive effective 28 September 2006.\n\nWho pays and who decides: aircraft owners/operators fund and perform the inspections/repairs; the Civil Aviation Safety Authority enforces the Directive."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific structural defect on specific aircraft models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (the FAA AD number)","No nested conditional logic or exceptions","Single cross-reference to external technical document (FAA AD 2006-16-11)","Clear applicability criteria (specific aircraft models)","Straightforward compliance requirement (follow the FAA directive)"],"plain_english_summary":"This AD requires operators of certain Boeing 737-700/-800 aircraft to inspect and repair fatigue cracks in the backup intercostals above the forward airstair door, following FAA AD 2006-16-11 adopted by Australia. It’s legally binding, must be complied with by 28 September 2006, and prevents crack growth that could lead to loss of cabin pressure and endanger occupants."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-295-airstair-doorstop-intercostal","history":"/api/acts/ad-b737-295-airstair-doorstop-intercostal/history","analysis":"/api/acts/ad-b737-295-airstair-doorstop-intercostal/analysis","conflicts":"/api/acts/ad-b737-295-airstair-doorstop-intercostal/conflicts","importantCases":"/api/acts/ad-b737-295-airstair-doorstop-intercostal/important-cases","documents":"/api/acts/ad-b737-295-airstair-doorstop-intercostal/documents"}}