{"id":"F2006B05168","name":"AD/CESSNA 188/32 Amdt 1 - Alternator Ground Strap","slug":"ad-cessna-188-32-amdt-1-alternator-ground-strap","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45293,"registerId":"commonwealth-F2006B05168-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/32 Amdt 1 - Alternator Ground Strap","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)  Cessna 188 (Agwagon) Series Aeroplanes\n\n \n\nAD/CESSNA 188/32\n\nAmdt 1\n\n\nAlternator Ground Strap 9/82\n\n \n\nApplicability: All model 188 with S/Nos. 18800050 to 18803240. Requirement:  Action in accordance with Cessna SIL SE79-59.\n\nNote: FAA AD 79-25-07 refers.\n\n \n\nCompliance: 1. Within 100 hours time in service after 31 March 1982.\n\n \n\n2. Each time an engine is installed in an aircraft following initial compliance.\n\n \n\nBackground: Compliance has been amended with the addition of item 2 due to reports from industry that ground straps are being omitted from refitment on engine reinstallations.\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":3,"scope_assessment":{"changed":true,"description":"The directive’s scope was expanded from the original wording by adding Compliance item 2. The addition requires that the alternator ground strap action be carried out each time an engine is installed after initial compliance. The Background explicitly states this amendment was made because industry reports showed ground straps being omitted during engine refits (Background)."},"complexity_factors":["Narrow applicability limited to a specific serial‑number range (Applicability)","Action defined by reference to an external manufacturer document (Cessna SIL SE79-59) rather than the AD setting technical detail (Requirement)","Two timing requirements: a dated time window and a recurring obligation on engine reinstallations (Compliance 1; Compliance 2)","Dependence on maintenance procedures and recordkeeping for effective compliance (Background; Compliance 2)","Historical effective date (31 March 1982) makes the compliance deadline a past anchor point rather than an ongoing new compliance window (Compliance 1)","Cross‑reference to FAA AD for related guidance (Note)"],"plain_english_summary":"What this directive does\n\n- This airworthiness directive applies to Cessna 188 aeroplanes with serial numbers 18800050 to 18803240 (Applicability). It requires the installation or verification of an alternator ground strap by following Cessna Service Information Letter SE79-59 (Requirement).\n\nWho must act and who pays\n\n- The aircraft owner/operator or their maintenance organisation must carry out the work and bear the cost of parts, labour and any downtime (Requirement). CASA enforces the directive by making compliance mandatory for the aircraft in the stated serial‑number range.\n\nWhen the work must be done\n\n- The directive requires compliance within 100 hours time-in-service after 31 March 1982 (Compliance 1). It also requires the action to be repeated each time an engine is installed in the aircraft after the initial compliance (Compliance 2).\n\nWhy the rule was issued (official rationale) and how that interacts with costs and incentives\n\n- The background statement says the second compliance item was added because industry reports showed ground straps were being omitted when engines were refitted (Background). The directive therefore claims to reduce the risk of alternator/earthing problems by forcing a specific maintenance step (Requirement).\n\nTesting that claim against practical trade-offs and implementation details\n\n- Directness of the requirement: The rule points to a specific manufacturer instruction (Cessna SIL SE79-59) rather than prescribing a new technical method itself, so compliance depends on following that external document (Requirement).\n- Who decides how it is done: Maintenance personnel and the approved organisation choose the exact procedures and timing consistent with the referenced SIL and applicable maintenance approvals; CASA’s role is to mandate compliance with the SIL (Requirement).\n- Costs and compliance burden: The measurable burdens are parts, labour, and aircraft downtime every time an engine is installed (Compliance 1 and 2). The directive imposes a recurring compliance point (engine reinstallations) rather than a one-off action, so owners who remove and reinstall engines frequently will incur repeated costs (Compliance 2).\n- Enforcement and implementation risk: The Background notes previous omissions in refitted engines, indicating the practical risk is procedural (checks not followed). The directive reduces scope for omission by making the step mandatory at each engine installation, but effective compliance depends on maintenance organisations integrating the requirement into their checklists and records (Background; Compliance 2).\n- Alignment with other regulators: The directive refers to an FAA airworthiness directive (Note), which suggests the action mirrors or tracks a counterpart FAA requirement rather than creating an Australia‑only standard (Note).\n\nNet mechanical effect\n\n- For affected Cessna 188s, the technical effect is to ensure an alternator ground strap is fitted/verified according to Cessna SIL SE79-59 within the stated time window and after every engine installation (Applicability; Requirement; Compliance 1; Compliance 2). This changes maintenance practice by adding a recurring verification/installation obligation tied to engine installation events.\n\nConcrete reference points from the instrument\n\n- Applicability: serial‑number range 18800050 to 18803240 (Applicability).\n- Required action: follow Cessna SIL SE79-59 (Requirement).\n- Timing: within 100 hours after 31 March 1982, and each time an engine is installed after initial compliance (Compliance 1 and Compliance 2).\n- Rationale for amendment: added item 2 because ground straps were omitted on engine refits (Background).\n- Cross‑reference: FAA AD 79‑25‑07 is noted (Note)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted amendment to a specific Airworthiness Directive. The scope remains precisely focused on alternator ground strap installation for a defined aircraft series. Amendment 1 added a recurring compliance trigger (engine reinstallation) based on industry feedback, but this is a refinement within the original safety purpose rather than scope creep."},"complexity_factors":["Extremely short document (under 200 words)","Only 2 substantive requirements with clear deadlines","Single applicability criterion (serial number range)","No defined terms section","No cross-references to other legislation (only references a Cessna service bulletin and FAA AD for context)","Simple conditional logic: initial compliance + recurring compliance trigger","Plain language background explanation"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). ADs are legally binding instructions that aircraft owners and operators must follow to fix unsafe conditions in aircraft.\n\n**What it does:** This AD applies to specific **Cessna 188 \"Agwagon\" agricultural aircraft** (serial numbers 18800050 through 18803240). It requires owners to install or check an **alternator ground strap** — a safety cable that prevents electrical faults — following instructions in a Cessna Service Information Letter (SIL SE79-59).\n\n**Who must comply:**\n- Owners and operators of affected Cessna 188 aircraft\n- Maintenance engineers performing engine reinstallations\n\n**When to comply:**\n- **First deadline:** Within 100 flight hours after 31 March 1982\n- **Ongoing requirement:** Every time an engine is reinstalled in the aircraft after the initial fix\n\n**Why it matters:** The AD was updated (Amendment 1) because mechanics were forgetting to reinstall ground straps when putting engines back in, creating fire and electrical hazards. This amendment closes that loophole by making the check mandatory at every engine reinstallation, not just once.\n\n**Key point:** This is a **safety-critical maintenance rule**. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap","history":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap/history","analysis":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap/analysis","conflicts":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap/conflicts","importantCases":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap/important-cases","documents":"/api/acts/ad-cessna-188-32-amdt-1-alternator-ground-strap/documents"}}