{"id":"F2006B10841","name":"AD/INST/38 - LITEF GmbH LCR-88 Attitude and Heading Reference System","slug":"ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56327,"registerId":"commonwealth-F2006B10841-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/38 - LITEF GmbH LCR-88 Attitude and Heading Reference System","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Instruments and Automatic Pilots\n\n \n\nAD/INST/38 LITEF GmbH LCR-88 Attitude and Heading Reference System\n\n\n6/94\n\n \n\nApplicability: Litef GmbH LCR-88 Attitude Heading Reference Units (AHRU) with the following part numbers, having Software Version 0202 incorporated:\n\n \n\n121319-0011,\n\n \n\n121319-0111,\n\n \n\n121319-1010, and\n\n \n\n121319-1032.\n\n \n\nRequirement: Reprogramme the AHRU computer module software in accordance with Litef GmbH Service Bulletin 121319-34-003 Revision 1 dated 22 October 1993.\n\n \n\nNote: German LBA AD 93-240 Litef refers.\n\n \n\nCompliance: Prior to 31 August 1994.\n\n \n\nBackground: Litef has advised that Software Version 0202 sends incorrect scaling of angular rate outputs, reprogramming of the software as required by this Directive, corrects this anomaly.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific software defect in specific equipment. It has not expanded beyond its original purpose of mandating a software update for flight safety."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 specific part numbers affected","Single, clear compliance action (software reprogramming)","One defined reference (the Service Bulletin)","Simple unconditional requirement with fixed deadline","No nested exceptions or conditional logic","No cross-references to other legislation beyond noting a related German directive"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft equipment rather than cars.\n\n**What it does:** It orders owners and operators of specific aircraft navigation systems (the LITEF GmbH LCR-88 Attitude and Heading Reference System) to update the software in those units. The affected units run \"Software Version 0202\" and have specific part numbers listed in the document.\n\n**The problem:** The current software sends incorrect scaling data for angular rate outputs — basically, the system that tells the pilot which way the aircraft is pointing and how fast it's turning is giving wrong numbers. This could lead to dangerous flight situations if not fixed.\n\n**What must happen:** The computer module must be reprogrammed following specific instructions in a service bulletin from the manufacturer (LITEF GmbH Service Bulletin 121319-34-003 Revision 1, dated 22 October 1993).\n\n**Who it affects:** Anyone operating aircraft with these specific LITEF navigation units installed — likely airlines, charter operators, or private aircraft owners with this equipment.\n\n**Deadline:** The fix had to be completed before 31 August 1994.\n\n**Why it matters:** This is about flight safety. Incorrect attitude and heading data can cause pilots to lose situational awareness, potentially leading to controlled flight into terrain or loss of control. The directive ensures all affected aircraft in Australia were fixed to the same standard."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD does not expand regulatory scope; it imposes a time‑limited corrective requirement on a defined set of units to remedy incorrect instrument outputs. The directive is corrective and specific, not a broad change to applicability or certification rules."},"complexity_factors":["Narrow applicability limited to specific LCR-88 units running Software Version 0202","Single corrective action: reprogram AHRU computer module per a named manufacturer service bulletin","Clear compliance deadline (prior to 31 August 1994)","Dependence on operator access to the service bulletin and maintenance facilities to perform reprogramming","Need to identify affected units (verify software version and part number) during maintenance","Reference to an external authority (German LBA AD) for context but no additional local procedures specified"],"plain_english_summary":"This directive requires affected Litef LCR-88 attitude/heading units with Software Version 0202 to have their computer-module software reprogrammed according to Litef Service Bulletin 121319-34-003 Rev 1 to fix incorrect angular-rate scaling. It applies to operators of aircraft fitted with those units and must be completed before 31 August 1994. Operators must source the service bulletin and schedule the reprogramming; the measure corrects an instrument output error identified by the manufacturer and referenced to the German LBA AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system","history":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system/history","analysis":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system/analysis","conflicts":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system/conflicts","importantCases":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system/important-cases","documents":"/api/acts/ad-inst-38-litef-gmbh-lcr-88-attitude-and-heading-reference-system/documents"}}