{"id":"F2005L00071","name":"AD/B737/86 Amdt 1 - Body Station 344 to 360 Support Structure","slug":"ad-b737-86-amdt-1-body-station-344-to-360-support-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":33453,"registerId":"commonwealth-F2005L00071-current","compilationNumber":null,"startDate":"2026-04-01","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/B737/86 Amdt 1 | Body Station 344 to 360 Support Structure | 2/2005 |\n| ----------------- | ----------------------------------------- | ------ |\n\n| Applicability: | Model 737-100, -200, -300, -400, and -500 series aircraft; equipped with intercostal support structures at stringer 5R and having a number 2 galley weight of 996 pounds or more (including any attached equipment that imposes loads on the galley).                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2004-23-07 Amdt 39-13862.Note: Boeing Special Attention Service Bulletin 737-53-1154 Revision 1, or later FAA approved revision, refer.                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 17 February 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Amendment becomes effective on 17 February 2005.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | This Directive was prompted by results of engineering tests and analyses, which revealed that certain fuselage support structure for the number 2 galley is unable to support certain loads that may occur during emergency landing conditions. If the fuselage structure breaks, the galley may shift and cause blockage of the forward service door.Amendment 1 is issued in response to a new FAA AD, which requires modification of the same support structure as required by the original issue of this Directive, but using new methods based on new calculations; and expands applicability to include additional aircraft. |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n5 January 2005","sortOrder":0},{"sectionNumber":"AD/B737/86 Amdt 1","sectionType":"part","heading":"AD/B737/86 Amdt 1","content":"## AD/B737/86 Amdt 1","sortOrder":1},{"sectionNumber":"Body Station 344 to 360 Support Structur","sectionType":"part","heading":"Body Station 344 to 360 Support Structure","content":"## Body Station 344 to 360 Support Structure","sortOrder":2},{"sectionNumber":"2/2005","sectionType":"part","heading":"2/2005","content":"## 2/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 broadened and altered the original directive's scope. It adopts a new FAA AD that uses revised calculation methods for the structural modification and expands the class of affected aircraft (increasing the number of aeroplanes that fall within the directive). The practical effect is a larger set of operators must follow updated technical methods (per the FAA AD and Boeing service bulletin) rather than the original procedures."},"complexity_factors":["Short directive text but relies on external technical documents (FAA AD 2004-23-07 and Boeing Service Bulletin 737-53-1154 Rev 1 or later)","Applicability depends on a measurable condition (number 2 galley weight ≥ 996 lb) plus structural configuration (intercostal support at stringer 5R)","Cross‑reference to later FAA‑approved revisions creates open‑ended technical variance","Amendment expands applicability and changes methods (new calculations), adding conditional scope compared with original AD","Technical compliance steps are not contained in the instrument itself but delegated to detailed aviation engineering documents"],"plain_english_summary":"This amendment adopts FAA AD 2004-23-07 and Boeing Special Attention SB 737-53-1154 (Rev 1+)—effective 17 Feb 2005—requiring inspection/modification of certain Boeing 737-100/200/300/400/500 aeroplanes fitted with an intercostal support at stringer 5R and a number‑2 galley (including attached equipment) weighing ≥996 lb. It addresses tests showing the galley support could fail in an emergency landing and block the forward service door. Operators bear costs; compliance choices include modification, reducing galley weight, or altering/removing the galley."},"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":true,"description":"The amendment explicitly expands the scope beyond the original directive. The Background section states Amendment 1 'expands applicability to include additional aircraft' compared to the original issue. It also replaces the original repair methods with 'new methods based on new calculations,' indicating the technical approach changed as well."},"complexity_factors":["Highly technical subject matter requiring aviation engineering knowledge to fully understand","Incorporates external documents by reference (FAA AD 2004-23-07 and Boeing Service Bulletin 737-53-1154) — the actual requirements are not spelled out in the text","Precise applicability criteria involving three technical conditions: specific aircraft models, specific structural configuration (intercostal support at stringer 5R), and specific weight threshold (996+ pounds)","Uses aviation-specific terminology without definitions (body station, stringer, intercostal support, galley weight specifications)","Short document (under 500 words) with minimal conditional logic or cross-referencing within the text itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific repairs or modifications to certain Boeing 737 aircraft.\n\n**What it does:**\n- Orders airlines and aircraft operators to strengthen or modify the support structure around the \"number 2 galley\" (a kitchen area) on specific Boeing 737 models\n- The galley sits near the forward service door, and the structure holding it in place may fail during an emergency landing\n- If the structure breaks, the galley could shift and block the door — trapping passengers inside\n\n**Who it affects:**\n- Operators of Boeing 737-100, -200, -300, -400, and -500 series aircraft\n- Only applies to planes with a specific internal support structure (\"intercostal support structures at stringer 5R\") AND a number 2 galley weighing 996 pounds (about 450 kg) or more\n\n**What must be done:**\n- Follow the technical instructions in **FAA AD 2004-23-07** (the US aviation safety regulator's equivalent order)\n- Use **Boeing Service Bulletin 737-53-1154 Revision 1** as the repair manual\n- Compliance deadline: 17 February 2005\n\n**Why this amendment matters:**\nThis is **Amendment 1** — an update to an earlier directive. It:\n- Expands the number of aircraft covered (more planes now need the fix)\n- Uses improved engineering calculations and new repair methods\n- Replaces the original requirements with updated ones from the US Federal Aviation Administration\n\n**In short:** If you own or operate an older Boeing 737 with a heavy forward galley, you must get this structural reinforcement done by February 2005 to prevent the galley from becoming a deadly obstacle during a crash landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure","history":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure/history","analysis":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure/analysis","conflicts":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure/conflicts","importantCases":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure/important-cases","documents":"/api/acts/ad-b737-86-amdt-1-body-station-344-to-360-support-structure/documents"}}