{"id":"F2006B02805","name":"AD/B737/101 - Elevator Feel and Centering Unit","slug":"ad-b737-101-elevator-feel-and-centering-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42147,"registerId":"commonwealth-F2006B02805-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/101 - Elevator Feel and Centering Unit","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 737 Series Aeroplanes\n\nAD/B737/101 Elevator Feel and Centering Unit 4/97\n\nApplicability: All model 737-300, \\-400, and \\-500 series aircraft up to and including line position 2764.\n\nRequirement: Inspect in accordance with the technical requirements of FAA AD 96-25-17 Amdt 39- 9860.\n\nNote: Boeing Alert Service Bulletin 737-27A1194 refers.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 27 March 1997.\n\nNote: Installation of supports and a stop-bolt in accordance with Boeing Alert Service Bulletin 737-27A1194 constitutes terminating action for the repetitive inspections required by this Directive, provided that no damage is detected during any inspection required by paragraph (a) of the Requirement document.\n\nBackground: The FAA received a report of high control column forces that occurred during takeoff and landing. The actions specified by this Directive are intended to prevent such high forces, which could result in restriction of elevator control during takeoff, climbout, and landing.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection and potential modification of the Elevator Feel and Centering Unit."},"complexity_factors":["Short, single-purpose directive (approximately 200 words)","Only 1 defined applicability criterion (specific aircraft line positions)","Single cross-reference to FAA AD 96-25-17 and Boeing Service Bulletin 737-27A1194","Simple conditional logic: terminating action available only if no damage detected","No nested definitions or interpretation sections","Technical content assumes aviation engineering knowledge but legislative structure is straightforward"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the Elevator Feel and Centering Unit on certain Boeing 737-300/-400/-500 aircraft after reports of abnormally high control‑column forces during takeoff and landing. The inspections follow FAA AD 96‑25‑17; if no prior damage is found, installing Boeing’s supports and stop‑bolt provides a permanent fix and ends repetitive checks. It affects Australian operators of the specified models and aims to prevent loss of elevator control in critical flight phases."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive incorporates the FAA inspection requirement for the specified 737 variants and adds a terminating-action pathway via the Boeing service bulletin. It does not broaden or narrow the population covered beyond the stated model/line-number limits, nor does it add new technical requirements beyond the referenced documents."},"complexity_factors":["Cross-reference to an external FAA Airworthiness Directive (FAA AD 96-25-17) for the technical inspection requirements","Conditional terminating action that depends on a successful inspection and installation per a Boeing Alert Service Bulletin","Limited applicability by model and line number (specific submodels and line positions up to 2764)","Compliance timing and revised effective date referenced rather than spelled out in full in this document","Operational compliance cost falls to aircraft operators (inspection and retrofit work)"],"plain_english_summary":"Requires operators of Boeing 737-300/‑400/‑500 aircraft (up to line 2764) to perform inspections of the elevator feel and centering unit in line with FAA AD 96-25-17 to prevent sudden high control‑column forces. Installing supports and a stop‑bolt per Boeing Alert Service Bulletin 737-27A1194 ends the need for repetitive inspections, provided no damage is found.\n\nOperators pay for inspections and any modification work; the Civil Aviation Safety Authority enforces compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit","history":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit/history","analysis":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit/analysis","conflicts":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit/conflicts","importantCases":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit/important-cases","documents":"/api/acts/ad-b737-101-elevator-feel-and-centering-unit/documents"}}