{"id":"F2006B05950","name":"AD/PA-38/12 - Additional Flow Strip Installation","slug":"ad-pa-38-12-additional-flow-strip-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":136101,"registerId":"commonwealth-F2006B05950-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-38/12 - Additional Flow Strip Installation","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Piper PA-38 (Tomahawk) Series Aeroplanes\n\n \n\nAD/PA-38/12 Additional Flow Strip Installation 8/79\n\nApplicability: Model PA-38-112 aircraft with S/Nos. 38-78A0001 through 38-79A0582.\n\n \n\nRequirement: 1. Install additional flow strips and modify or replace the airspeed indicator in accordance with Piper SL No. 876.\n\n \n\n2. An approved amendment must be introduced to the aircraft flight manual before further flight following incorporation of SL No. 876, to reflect the increased stall speeds, take-off and landing safety speeds and distances which result from the modification.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1979.\n\n \n\nBackground:  The flow strip installation is to improve the handling character- istics of the aircraft during stall manoeuvres.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument sets requirements for a specific serial‑number range and prescribes installation, instrument work, and an approved AFM amendment with a 100‑hour compliance window. The text contains no indication that these applicability or requirement boundaries differ from the instrument's stated intent."},"complexity_factors":["Technical modification: physical installation of flow strips and modification or replacement of the airspeed indicator (Requirement 1, Piper SL No. 876).","Operational/documentation change: mandatory approved amendment to the aircraft flight manual before further flight after modification to reflect increased performance numbers (Requirement 2).","Compliance scheduling and tracking: fixed compliance window of 100 hours time‑in‑service after 30 September 1979 (Compliance).","Limited applicability: only affects a defined range of serial‑numbered PA‑38‑112 aircraft, creating a concentrated compliance population (Applicability).","Performance impact: modification increases stall, take‑off and landing speeds and distances, requiring changes to pilot operating practices and possibly training (Requirement 2; Background).","Regulatory approval layer: the AFM amendment must be 'approved', introducing regulator discretion and paperwork to return the aircraft to service (Requirement 2)."],"plain_english_summary":"Requires owners/operators of Piper PA‑38‑112 aircraft (S/N 38‑78A0001–38‑79A0582) to install additional flow strips and to modify or replace the airspeed indicator in accordance with Piper Service Letter No. 876, and to introduce an approved amendment to the aircraft flight manual before further flight to record higher stall, take‑off and landing speeds and distances. Compliance must occur within 100 hours time in service after 30 September 1979. The stated aim is to improve stall handling."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive focused on a specific airworthiness issue. It has not expanded beyond its original purpose of mandating a manufacturer service bulletin for improved stall characteristics."},"complexity_factors":["Single, discrete safety modification with clear mechanical requirements","Only 2 operational requirements (physical installation + documentation update)","Simple applicability test (specific model + serial number range)","Single compliance deadline with straightforward calculation (100 hours time in service after fixed date)","No cross-references to other legislation, regulations, or complex conditional logic","Minimal defined terms (only standard aviation terminology like 'time in service')"],"plain_english_summary":"This CASA Airworthiness Directive mandates installation of wing flow strips, modification or replacement of the airspeed indicator, and corresponding aircraft flight manual updates for certain Piper PA‑38‑112 Tomahawks (serials 38‑78A0001 to 38‑79A0582). It affects owners/operators of those late‑1970s aircraft to correct poor slow‑flight/stall handling: the changes make stall behaviour more predictable and ensure pilots use appropriate speeds. Work was required within 100 flight hours after 30 Sep 1979."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-38-12-additional-flow-strip-installation","history":"/api/acts/ad-pa-38-12-additional-flow-strip-installation/history","analysis":"/api/acts/ad-pa-38-12-additional-flow-strip-installation/analysis","conflicts":"/api/acts/ad-pa-38-12-additional-flow-strip-installation/conflicts","importantCases":"/api/acts/ad-pa-38-12-additional-flow-strip-installation/important-cases","documents":"/api/acts/ad-pa-38-12-additional-flow-strip-installation/documents"}}