{"id":"F2006B03636","name":"AD/BEECH 1900/18 Amdt 2 - Outboard Flap Attachment Brackets and Aft Roller Bearings","slug":"ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43226,"registerId":"commonwealth-F2006B03636-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 1900/18 Amdt 2 - Outboard Flap Attachment Brackets and Aft Roller Bearings","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)  \nBeechcraft 1900 Series Aeroplanes\n\nAD/BEECH 1900/18\n\nAmdt 2\n\n  \n\nOutboard Flap Attachment Brackets and Aft Roller Bearings\n\n  \n3/99\n\nApplicability: Models Serial Numbers\n\n1900 UA-1, UA-2, and UA-3\n\n1900C UB-1 through UB-74, and UC-1 through UC-174\n\n1900C (C-12J) UD-1 through UD-6\n\n1900D UE-1 through UE-322\n\nRequirement: Inspect the outboard flap attachment brackets and roller bearings on both wings for visible wear and elongation of the bracket holes in accordance with the Accomplishment Instructions section of Raytheon Aircraft Safety Communique No. 137, Revision 1.\n\nRepair or replace any worn or damaged part in accordance with Raytheon Aircraft Temporary Revision No. 57-1 to the Raytheon Aircraft Beech 1900 Airliner Series Structural Repair Manual part number 114-590021-9B6 dated May 16 1997; Reissued June 30 1992.\n\nNote 1: FAA AD 99-01-03 Amdt 39-10970 refers.\n\nNote 2: Raytheon Aircraft Beech Mandatory Service Bulletin (MSB) 27-3158, issued July 1998, installs improved outboard flap support roller bearings and is an alternate means of compliance with this Directive, relieving the flap inspection intervals.\n\nCompliance: Upon the accumulation of 600 total flight cycles, or within 600 flight cycles from the date of the last inspection required by the previous issue of this Directive, or within the next 100 flight cycles after 25 March 1999, whichever occurs later; thereafter at intervals not to exceed 600 flight cycles; until compliance with MSB 27-3158.\n\nThis Amendment becomes effective on 25 March 1999.\n\nBackground: The FAA received three reports of Raytheon 1900 series aircraft that had entered into an uncommanded roll after setting the flaps at 35 degrees. In one incident, the operator applied extreme force to the control wheel to counter the roll and landed.\n\nThe actions specified by this Directive are intended to prevent interference between the flap and the aileron which could inhibit aileron movement and result in possible loss of control of the aircraft.\n\nAmendment 1 reflected the intent of a new Raytheon bulletin which is an FAA approved alternate method of compliance with FAA AD 97-14-16, the basis of this Directive.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nAmendment 2 is issued in response to a new FAA AD which supersedes AD 97-14- 16, and while retaining the repetitive inspection requirement of the previous AD, it reduces the number of cycles allowed between inspections and lowers the total number of accumulated cycles allowed before mandatory accomplishment of the initial inspection.\n\nAmendment 1 of this Airworthiness Directive became effective on 8 October 1998.\n\nThe original issue of this Airworthiness Directive became effective on 9 October 1997.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 2 narrows the allowable time before inspections compared with the original issue: it reduces the number of flight cycles permitted between inspections (to 600 cycles) and lowers the total accumulated cycles allowed before the mandatory initial inspection. Mechanically, the directive tightens the inspection schedule (shorter intervals and earlier required initial inspection) while retaining the original target components and corrective approach; it does not broaden the types of parts or aircraft affected but increases the frequency/earliness of mandated inspections."},"complexity_factors":["Multiple conditional timing triggers for initial inspection (three alternative timing conditions; 'whichever occurs later').","Repetitive inspection interval (every 600 flight cycles) plus a transitional 100-cycle window tied to the effective date.","Applicability lists several models and many serial-number ranges to which the AD applies.","References to several external documents as prescriptive compliance tools (Raytheon Safety Communique No.137 Rev 1; Raytheon Temporary Revision No.57-1 to the Structural Repair Manual; FAA AD 99-01-03; MSB 27-3158).","An approved alternative means of compliance (MSB 27-3158) that changes the ongoing inspection obligation.","Amendment history and cross-reference to previous ADs and FAA actions creating nested historical context (original AD, Amendment 1, Amendment 2)."],"plain_english_summary":"**What this directive does**\n\n- Requires inspection of the outboard flap attachment brackets and the aft (rear) flap roller bearings on both wings of Beechcraft 1900 series aeroplanes for visible wear and for elongation (stretching) of the bracket holes. (Requirement)\n- If any bracket or bearing is worn or damaged, it must be repaired or replaced following the Raytheon Aircraft Structural Repair Manual Temporary Revision specified in the directive. (Requirement)\n- As an alternative to repeated inspections, operators may install the improved outboard flap support roller bearings described in Raytheon Mandatory Service Bulletin MSB 27-3158; installing that SB removes the repetitive inspection requirement. (Note 2)\n\n**Who is affected**\n\n- Owners and operators of Beechcraft 1900 series aircraft with the listed model/serial ranges (Models 1900, 1900C, 1900C (C-12J) and 1900D; serial numbers listed in the directive). (Applicability)\n- Maintenance organisations and licensed engineers who carry out the inspections and repairs, because they must use the Raytheon instructions and repair manual referenced in the directive. (Requirement)\n\n**When inspections must be done**\n\n- Do the initial inspection when the aeroplane has accumulated 600 total flight cycles, or within 600 flight cycles from the date of the last inspection required under the previous version of this directive, or within the next 100 flight cycles after 25 March 1999 — whichever of those three dates is later. Then repeat inspections at intervals not to exceed 600 flight cycles, until the improved bearings in MSB 27-3158 are installed. (Compliance)\n\n**Why the directive was issued (stated reason and mechanism)**\n\n- The FAA received three reports where a Raytheon 1900 series aeroplane entered an uncommanded roll when the flaps were set to 35 degrees. In one case, the pilot had to apply extreme control-wheel force to recover and land. (Background)\n- The directive aims to prevent interference between the flap and the aileron (the movable surface that controls roll). Such interference could inhibit aileron movement and potentially lead to loss of control. The inspections and repairs aim to catch worn brackets or bearings before they cause that interference. (Background & Requirement)\n\n**How it works in practice — who pays, who decides, what changes**\n\n- Who pays: the aircraft owner/operator pays for the inspections, any required repairs or part replacements, and for installing the MSB upgrade if they choose that alternative. Operators also bear the aircraft downtime while maintenance is carried out. (Requirement, Compliance, Note 2)\n- Who decides: the Civil Aviation Safety Authority (CASA) issues the directive and sets the compliance dates/intervals; operators decide whether to comply by continuing the repetitive inspections or by installing the improved bearings under the manufacturer’s service bulletin. Maintenance providers decide how to carry out repairs so long as they follow the referenced Raytheon repair instructions. (Requirement, Note 2)\n- Behaviour changes required: operators must add the specified inspections into their maintenance schedules at the stated intervals; maintenance organisations must follow the Raytheon accomplishment instructions and repair manual when addressing defects; some operators may choose a one-off retrofit (MSB 27-3158) to remove ongoing inspection obligations. (Requirement, Compliance, Note 2)\n\n**Practical costs, incentives and operational trade‑offs**\n\n- Direct costs: periodic inspection labour and possible parts replacement costs; potential one-off cost to install the MSB upgrade (which removes later repetitive inspections). (Requirement, Note 2)\n- Incentives: the repetitive-inspection path creates an ongoing maintenance cost and aircraft downtime; installing the improved bearings shifts the operator’s choice toward a single upgrade cost in exchange for reduced future operating cost and inspection burden. (Note 2, Compliance)\n- Implementation risks and compliance burden: operators must obtain and correctly apply the Raytheon documents referenced (Raytheon Communique No.137 Rev 1 and Temporary Revision No. 57-1 to the Structural Repair Manual). Availability of parts, scheduling of the work, and consistent interpretation of “visible wear” and “elongation” are practical risks that affect how quickly operators can comply and whether aircraft are temporarily grounded. (Requirement)\n- Dependency on manufacturer instructions: the directive requires particular Raytheon instructions and a specific repair manual revision for repair methods. This creates a procedural dependency on the manufacturer’s published methods as the prescribed way to restore airworthiness, while still allowing the MSB upgrade as an approved alternative. (Requirement, Note 2)\n\n**Net effect**\n\n- The directive tightens inspection duty for the listed Beechcraft 1900 aircraft to detect and remedy wear in outboard flap brackets and bearings that could allow flap–aileron interference. Operators either must carry out recurring inspections at the stated intervals or choose to install the improved bearings under the manufacturer’s service bulletin to eliminate the recurring inspections. (Requirement, Compliance, Note 2)\n\n(References: Requirement, Compliance, Note 2, Background, Applicability in the directive text.)"},"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":false,"description":"This Amendment 2 stays within the original scope of addressing flap attachment bracket wear. While it tightens inspection intervals (reducing cycles between inspections and lowering the threshold for initial inspection), it does not expand to cover new aircraft types, new systems, or new failure modes beyond the original safety concern of uncommanded roll due to flap/aileron interference."},"complexity_factors":["Multiple compliance deadlines with a 'whichever occurs later' calculation (three different triggers for initial inspection)","Cross-references to external documents: Raytheon Safety Communique No. 137 Rev 1, Temporary Revision 57-1 to Structural Repair Manual, FAA AD 99-01-03, and MSB 27-3158","Amendment history requires tracking (original issue 1997, Amendment 1 1998, Amendment 2 1999) to understand current requirements","Specific serial number applicability ranges that must be checked against aircraft registration","Conditional termination clause ('until compliance with MSB 27-3158') creates alternative compliance path"],"plain_english_summary":"This safety order requires operators of Beechcraft 1900/1900C/1900D aircraft to inspect and, if needed, repair or replace metal flap brackets and roller bearings that attach the outboard flaps, or install improved bearings as an alternative.  \n\nIt targets affected owners and maintenance crews to prevent worn brackets from causing flap–aileron interference and unexpected roll events that have led to loss of control during landing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings","history":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings/history","analysis":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings/analysis","conflicts":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings/conflicts","importantCases":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings/important-cases","documents":"/api/acts/ad-beech-1900-18-amdt-2-outboard-flap-attachment-brackets-and-aft-roller-bearings/documents"}}