{"id":"F2006B10583","name":"AD/HU 269/107 - Main Rotor Blade Abrasion Strip","slug":"ad-hu-269-107-main-rotor-blade-abrasion-strip","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116429,"registerId":"commonwealth-F2006B10583-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/107 - Main Rotor Blade Abrasion Strip","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)  \nSchweizer (Hughes) 269 Series Helicopters\n\nAD/HU 269/107 Main Rotor Blade Abrasion Strip 13/98\n\nDM\n\nApplicability: Model 269A, 269A-1, 269B, and TH-33A helicopters with main rotor blades, part number 269A1190-1, serial numbers S0001 through S0012 installed; and Model 269C and 269D helicopters with main rotor blades, part number 269A1185-1, serial numbers S222, S312, S313, S325 through S327, S339, S341, S343, S346, S347, S349\n\nthrough S367, S369 through S377, S379 through S391, S393 through S395, S397, S399, S401 through S417, S419 through S424, S426 through S449, S451 through S507, S509 through S513, S516 through S527, S529 through S540, S542, S544 through S560, S562 through S584, S586 through S595, S597 through S611, S620 through S623, S625, S628, S633, S641 through S644, S646, S653, S658, S664, S665,\n\nand S667, installed.\n\nRequirement: 1. Visually inspect the adhesive bead around the perimeter of each abrasion strip for erosion, cracks, or blisters.\n\n    2. Visually inspect the bond line between each abrasion strip and each blade skin for voids, separation, or lifting of the abrasion strip.\n\n    3. Inspect each abrasion strip for debonding or hidden corrosion voids using a tap (ring) test as described in the applicable maintenance manual.\n\nIf any deterioration of an abrasion strip adhesive bead is discovered, before further flight, restore the bead in accordance with the applicable maintenance manual.\n\nIf any abrasion strip bonding, separation, or a hidden corrosion void is found or suspected, before further flight, remove the affected blade and replace it with a serviceable blade.\n\nA permanent repair of an affected blade’s entire abrasion strip is considered terminating action for the requirements of this Directive. Identify the repaired blade with a white dot added adjacent to the blade serial number.\n\nNote: FAA AD 98-18-11 Amdt 39-10727 refers.\n\nCompliance: Within 50 hours time in service after 21 October 1998, or before 21 January 1998, whichever occurs first, or before installing an affected replacement blade; and thereafter at intervals not to exceed 50 hours time in service from the date of the last inspection or replacement installation.\n\nThis Airworthiness Directive becomes effective on 21 October 1998.\n\nBackground: The FAA received four reports that indicated that debonding and corrosion have occurred on certain blades where the abrasion strip attaches to the blade skin. Loss of the abrasion strip from the blade could result in loss of control of the helicopter.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES","sortOrder":0}],"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":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with focused scope. It addresses a specific safety defect identified by the FAA (debonding/corrosion of abrasion strips) on specific blade serial numbers. The scope remains tightly constrained to the identified safety risk without expansion into broader maintenance requirements."},"complexity_factors":["Extensive serial number lists (over 100 specific serial numbers listed individually rather than as ranges where possible)","Multiple model applicability with different part numbers requiring careful cross-referencing","Conditional compliance dates ('whichever occurs first' logic)","Three distinct inspection types with different failure criteria and remediation actions","Reference to external documents (FAA AD 98-18-11 and maintenance manuals) for test procedures without reproducing them","Terminating action provision with specific marking requirement (white dot)","Nested applicability criteria (model + part number + serial number)"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Schweizer (Hughes) 269-series helicopters (only those with the listed rotor blade part and serial numbers) to inspect main-rotor abrasion strips for damage, corrosion or debonding using visual checks and tap tests, and to repair or replace blades as specified.\n\nInspections start by the dates/flight-hour limits in the directive and repeat every 50 flight hours. The rule addresses reports of strips detaching in flight, which can lead to loss of control and crashes."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies only to the specifically listed 269-series models and blade serial numbers and sets inspection/repair requirements tied to those blades. The text provides no indication that the scope was expanded or narrowed beyond addressing the reported debonding and corrosion risk."},"complexity_factors":["Detailed applicability defined by a long list of specific blade serial numbers (clerical burden to determine applicability).","Multiple inspection methods required: visual checks of the adhesive bead and bond line, plus a tap (ring) test per the applicable maintenance manual (requires technical skill and reference materials).","Mandatory actions before further flight: restore adhesive bead, or remove and replace blade if bonding or hidden corrosion is found (operational disruption and parts/maintenance cost borne by operators).","A permanent repair is declared a terminating action but must be identified by a white dot adjacent to the blade serial number (administrative marking requirement).","Compliance timing is strict: initial compliance within 50 flight hours (or before a set date/installation) and recurring at 50‑hour intervals (scheduling and recordkeeping impact).","References to external documents (applicable maintenance manual and FAA AD 98-18-11) create dependency on other sources for inspection and repair procedures."],"plain_english_summary":"Requires recurring inspections of main-rotor blade abrasion strips on specified Schweizer (Hughes) 269 helicopters and mandates repair or blade replacement before further flight if adhesive erosion, bond separation, or hidden corrosion is found. A permanent full-strip repair identified by a white dot terminates the AD.\n\nOperators of listed models and blade serial numbers must comply within 50 flight hours and every 50 hours thereafter. CASA issued the directive after FAA reports that debonding and corrosion can cause loss of the abrasion strip and potential loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip","history":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip/history","analysis":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip/analysis","conflicts":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip/conflicts","importantCases":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip/important-cases","documents":"/api/acts/ad-hu-269-107-main-rotor-blade-abrasion-strip/documents"}}