{"id":"F2006B10584","name":"AD/HU 269/108 - Main Rotor Blade Abrasion Strip","slug":"ad-hu-269-108-main-rotor-blade-abrasion-strip","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116431,"registerId":"commonwealth-F2006B10584-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/108 - 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 269/108 Main Rotor Blade Abrasion Strip 5/99\n\nDM\n\nApplicability: Model 269C-1 helicopters with main rotor blades, part number 269A1185-1, serial number S222, S312, S313, S325, S326, S327, S339, S341, S343, S346, S347, S349\n\nthrough S367, S369 through S377, S379 through S391, S393, S394, 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 main rotor blade 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 abrasion strip debonding, separation, or a hidden corrosion void is found or suspected, before further flight, remove the blade with the defective abrasion strip and replace it with a serviceable blade.\n\nRebonding of an affected blade’s abrasion strip is considered a terminating action for the requirements of this Directive for that blade. Identify a blade that has a rebonded strip by adding a white dot adjacent to the blade serial number.\n\nNote: FAA AD 99-04-14 Amdt 39-11038 refers.\n\nCompliance: Within 50 hours time in service after 24 March 1999 or before 24 June 1999, whichever occurs first; 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 24 March 1999.\n\nBackground: The FAA received four reports of debonding and corrosion on certain blades where the abrasion strip attaches to the blade skin. The actions specified by this Directive are intended to prevent loss of the abrasion strip from the blade and subsequent loss of control of the helicopter.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive’s scope is limited to the listed 269C-1 main rotor blades and addresses debonding, separation and hidden corrosion of the abrasion strip attachment. It does not broaden to other models or components; the required inspections, repair (rebond) or replacement actions directly reflect the stated safety objective to prevent loss of the abrasion strip (Applicability; Requirement; Background)."},"complexity_factors":["Long, specific applicability list of serial-numbered blades increases administrative tracking and record checks (Applicability).","Multiple inspection techniques required: visual inspection of adhesive bead and bond line, plus a tap (ring) test per the maintenance manual (Requirement 1–3).","Mandatory immediate actions before further flight create strict operational constraints for operators (Requirement: restore bead; remove/replace blade).","Compliance timing combines an initial calendar deadline and recurring hourly intervals (Compliance: within 50 hours after 24 March 1999 or before 24 June 1999; then every 50 hours).","Rebonding is a terminating action but requires physical identification (white dot), adding a record-keeping/marking step (Requirement).","Dependence on external documents (the applicable maintenance manual and referenced FAA AD) for test procedures and guidance increases reliance on other sources (Note; Requirement)."],"plain_english_summary":"Requires regular inspections of the adhesive bead and bond between the abrasion strip and the main rotor blade on specific Schweizer (Hughes) 269C-1 blades, using visual checks and a tap (ring) test. If adhesive deterioration is found the bead must be restored; if debonding, separation or hidden corrosion is found or suspected, the defective blade must be replaced before further flight. Inspections begin within 50 flight hours and recur every 50 hours; rebonding is a terminating action and must be marked."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive (AD) addressing a specific safety defect identified by the FAA. It remains tightly scoped to the particular mechanical issue (debonding of abrasion strips on specific rotor blades) and does not expand beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical issue (rotor blade abrasion strips)","Only three inspection requirements, clearly numbered","Straightforward conditional logic (if problem found → specific action required)","Limited applicability (one helicopter model, specific part numbers, enumerated serial numbers)","No cross-references to other legislation beyond a single note about the related FAA directive","Simple compliance timeline (initial deadline + recurring 50-hour intervals)","No defined terms section or interpretive provisions"],"plain_english_summary":"This CASA safety order requires owners, operators and maintenance engineers of Schweizer (Hughes) 269C-1 helicopters with specified main rotor blades to inspect the abrasion/protective strips for damage, corrosion or debonding (including tap testing) and to repair or replace blades as directed.  \n\nIt responds to reports of strips coming loose—detachment in flight can lead to loss of control—so the inspections and corrective actions prevent potential accidents."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip","history":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip/history","analysis":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip/analysis","conflicts":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip/conflicts","importantCases":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip/important-cases","documents":"/api/acts/ad-hu-269-108-main-rotor-blade-abrasion-strip/documents"}}