{"id":"F2006B09445","name":"AD/ELECT/70 Amdt 2 - Inflatable Door Seal System","slug":"ad-elect-70-amdt-2-inflatable-door-seal-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53877,"registerId":"commonwealth-F2006B09445-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Affected STC Make and Model Aircraft Aff","sectionType":"part","heading":"Affected STC Make and Model Aircraft Affected","content":"# Affected STC Make and Model Aircraft Affected\n\nSA3735NM Cessna Models 170, 170A, and 170B\n\nSA4136WE Cessna Models 310, 310A, 310B, 310C, 310D, 310E, 310F, 310G, 310H, 310I, 310J, 310K, 310L, 310N, 310P, 310Q, 310R, T310P, T310Q, and T310R\n\nSA2226NM Cessna Models P210N and P210R\n\nSA3736NM Cessna Models 185, 185A, 185B, 185C, 185D, A185E, and A185F\n\nSA4177WE Cessna Models 175, 175A, 175B, and 175C\n\nSA4212WE Cessna Models 210, 210A, 210B, 210C, 210D, 210E, 210F, 210G, 210H, 210J, 210K, 210L, 210M, 210N, T210F, T210G, T210H, T210J, T210K, T210L, T210M, T210N, 210-5 (205), and 210-5A (205A)\n\nSA4283WE Cessna Models 172, 172A, 172B, 172C, 172D, 172E, 172F, 172G, 172H, 172I, 172K, 172L, 172M, and 172N\n\nSA4284WE Cessna Models 180, 180A, 180B, 180C, 180D, 180E, 180F, 180G, 180H, 180J, and 180K\n\nSA4285WE Cessna Models 182, 182A, 182B, 182C, 182D, 182E, 182F, 182G, 182H, 182J, 182K, 182L, 182M, 182N, 182P, 182Q, R182, and TR182","sortOrder":0},{"sectionNumber":"“ELECTRIC DOOR SEAL INFLATION SYSTEM INO","sectionType":"part","heading":"“ELECTRIC DOOR SEAL INFLATION SYSTEM INOPERATIVE”","content":"# “ELECTRIC DOOR SEAL INFLATION SYSTEM INOPERATIVE”\n\n    b. Add the following statement to the Limitations section of the Flight Manual:","sortOrder":1}],"analysis":{"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":4,"scope_assessment":{"changed":false,"description":"This appears to be Amendment 2 to an existing Airworthiness Directive (AD/ELECT/70). The scope remains focused on the specific safety issue of Bob Fields Aerocessories inflatable door seal systems on affected Cessna aircraft. The amendment adds alternative methods of compliance and clarifies operational restrictions but does not expand beyond the original safety purpose of addressing door seal system failures."},"complexity_factors":["Multiple overlapping conditions based on aircraft pressurisation capability and system operational status","Cross-reference to FAA AD 98-21-21 Revision 1 Amdt 39-11621 and Bob Fields Aerocessories Service Bulletin No BFA-001","Duplicated and garbled text in the source document (repeated headings with truncation errors like 'INO') suggesting formatting issues in the original","Exception to the exception: Pressurised P210 series aircraft have an alternate compliance method if they can pressurise without door seals","Multiple STC numbers and aircraft model variants listed (approximately 8 STCs covering 60+ aircraft model designations)"],"plain_english_summary":"This AD applies to Cessna models fitted with Bob Fields Aerocessories electrically inflatable door seals under certain STCs. It requires operators to mark inoperative systems in the flight manual/placard and to restrict pressurised flight when seals are unserviceable; new installations are banned unless Service Bulletin BFA‑001 modifications are completed, though removal and reversion to approved seals is an acceptable alternative.  \n\nThe measure prevents unrecognised cabin depressurisation and the attendant hypoxia risk."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment expands the instrument from an operational limitation (recording the system inoperative) to a more prescriptive set of obligations: it forbids future installation of Bob Fields inflatable seals unless the manufacturer’s Service Bulletin BFA-001 has been incorporated, requires explicit Flight Manual limitations including a prohibition on pressurised flight for aircraft that need the seals for pressurisation, and sets out formal alternative compliance routes (removal/replacement or placarding for certain types). In practical terms, the scope moved from simply documenting an inoperative system to mandating corrective modification/installation restrictions and permitting specified alternatives, thereby increasing compliance obligations and affecting installation practice and parts/maintenance markets."},"complexity_factors":["Multiple affected STCs listed (around 10 STC references) with many specific aircraft model variants (dozens of Cessna model entries)","Two distinct operational requirements: Flight Manual limitation for all affected aircraft, plus an additional and stricter limitation for pressurised aircraft","A clear prohibition on installation unless a specified Service Bulletin (BFA-001) is incorporated","Alternative methods of compliance provided (removal/replacement; placard option for certain pressurised types)","Cross-reference to external documents: Bob Fields Service Bulletin BFA-001 and FAA AD 98-21-21 Revision 1","Specific technical/formatting requirement for placard lettering size (2.5 mm)","Conditional logic based on aircraft pressurisation capability and prior compliance with earlier issues of the Directive"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Applies to a list of Supplemental Type Certificate (STC) installations of Bob Fields Aerocessories electrically inflatable door seals on many Cessna models (the AD lists the affected STCs and models).\n- Requires operators to add a specific limitation to the aircraft Flight Manual or operating limitations that says, in effect, \"ELECTRIC DOOR SEAL INFLATION SYSTEM INOPERATIVE\" (i.e. the aircraft has a noted inoperative system) so the limitation is formally recorded in the Flight Manual (the AD says this may be done by inserting a copy of the AD into the Limitations section).\n- For pressurised aircraft, or aircraft that rely on the door-seal inflation system to obtain pressurisation, the AD requires an additional Flight Manual limitation: effectively \"ELECTRIC DOOR SEAL INFLATION SYSTEM INOPERATIVE — THIS AIRCRAFT CAN ONLY BE OPERATED IN UNPRESSURISED FLIGHT.\" That is, with the electric seals inoperative the aircraft must not be flown pressurised unless other compliance options are used.\n- Prohibits installation of Bob Fields Aerocessories electrically inflatable door seals on any aeroplane unless the actions in Bob Fields Aerocessories Service Bulletin No BFA-001 dated 3 November 1998 have been incorporated.\n- Lists optional alternative methods of compliance: either remove the Bob Fields inflatable seals and reinstall the original equipment manufacturer (OEM) seals or an approved non‑Bob Fields design; or for certain pressurised types (specifically the Cessna P210 series and similar aircraft that can obtain pressurisation without the inflatable door seals) fit a visibly legible placard on the instrument panel that states \"ELECTRIC DOOR SEAL INFLATION SYSTEM INOPERATIVE\" (letters at least 2.5 mm high), which then permits pressurised operation under the applicable Flight Manual provisions.\n\nWho this affects\n\n- Aircraft owners and operators of the listed Cessna models that have Bob Fields electrically inflatable door seals installed under the listed STCs.\n- Maintenance organisations and certificated personnel who must incorporate the Flight Manual amendment/placard or carry out removals or service-bulletin corrective actions.\n- Parts suppliers or modification shops that install, remove or repair the Bob Fields inflatable seals.\n\nWhy it matters (practical effect)\n\n- The AD restricts how affected aeroplanes can be operated while the electric door seal inflation system is inoperative: either a limitation is recorded (for all affected aircraft) or, for pressurised types that rely on the seals, the aircraft must not be flown pressurised unless an approved alternative compliance route is used.\n- It prevents further installation of the Bob Fields inflatable seals unless the manufacturer’s service bulletin (BFA-001) has been incorporated, which forces either a corrective modification to the seal installation or replacement with a different door seal design.\n\nSource’s claimed purpose and the concrete mechanisms that achieve it\n\n- The directive’s stated aim (as shown by the required Flight Manual limitations and removal/repair options) is to prevent pressurised flight when the electric door-seal inflation system is inoperative and to eliminate unsafe installations of the Bob Fields seals unless a specified service-bulletin action has been done.\n- Mechanically, this is implemented by: (a) formally recording the inoperative condition in the Flight Manual (making it a legal operating limitation), (b) prohibiting pressurised operation where those seals are required for pressurisation, (c) forbidding new installs without incorporation of a corrective Service Bulletin, and (d) allowing two compliance paths — replacement with an OEM or other approved design, or placarding where an aircraft can pressurise without the inflatable seals.\n\nCosts, incentives and trade-offs (who pays and who decides)\n\n- Who pays: aircraft owners/operators pay for any required work — insertion of the Flight Manual limitation (low cost administrative), fabrication and installation of the placard (low cost), incorporation of the Service Bulletin work (cost of parts and labour), or removal/replacement of the inflatable seals with OEM/approved seals (parts and labour; potentially higher cost). If an aircraft is restricted to unpressurised flight it may suffer operational limits (range, altitude, mission capability) which have economic consequences for owners/operators.\n- Who decides: the regulator (by issuing the AD) sets the mandatory requirements; approved maintenance organisations or certificated engineers implement the work and must certify compliance. Operators decide which compliance path to take (service‑bulletin incorporation, removal and replacement, or placarding where allowed).\n- Incentives and substitution effects: operators seeking to avoid operational restriction or higher maintenance cost may choose to remove the Bob Fields seals and reinstall OEM or an approved alternative. Aircraft owners who rarely require pressurised flight may instead accept the placard/limitation if eligible (e.g. certain P210-series aircraft). Shops that perform the corrective service or replacements stand to gain business from AD compliance work.\n\nImplementation risk, compliance burden and discrete effects on private choice and markets\n\n- Compliance burden is a mix of administrative (inserting the AD into the Flight Manual or fitting a placard) and physical (incorporating the Service Bulletin or replacing seals). The latter may involve parts lead times and certified labour.\n- Implementation risk includes verifying that installs are done to the referenced Service Bulletin, managing aircraft downtime while work is performed, and ensuring placard wording/size complies exactly (the AD requires at least 2.5 mm letter height for the placard text).\n- Effects on private choice and markets: the directive limits an owner’s freedom to operate pressurised if the inflatable seals are inoperative and may shift demand from suppliers of Bob Fields seals to OEM or other approved designs. Maintenance providers certified to do the Service Bulletin work may see increased demand; independent shops that cannot perform the approved work face loss of business on these installations.\n\nOther practical notes\n\n- The AD references FAA AD 98-21-21 Revision 1 as related material and explicitly allows removal and replacement with OEM or approved non‑Bob Fields seals as an alternative method of compliance.\n- The Flight Manual insertion can be done by physically inserting a copy of the AD into the Limitations section (administrative compliance option).\n\n(Clauses and directives referenced above are the numbered actions and notes in the AD: the required Flight Manual statements, the pressurisation prohibition, the prohibition on installation without incorporation of Service Bulletin BFA-001 dated 3 November 1998, and the listed optional alternative methods of compliance.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system","history":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system/history","analysis":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system/analysis","conflicts":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system/conflicts","importantCases":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system/important-cases","documents":"/api/acts/ad-elect-70-amdt-2-inflatable-door-seal-system/documents"}}