{"id":"F2006B10207","name":"AD/GAF-N22/59 Amdt 1 - Engine Ground Running","slug":"ad-gaf-n22-59-amdt-1-engine-ground-running","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55865,"registerId":"commonwealth-F2006B10207-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GAF-N22/59 Amdt 1 - Engine Ground Running","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)  \nGAF N22 and N24 Series Aeroplanes\n\nAD/GAF-N22/59\n\nAmdt 1\n\n  \nEngine Ground Running 11/91 DM\n\nApplicability: Model N22 and N24 series.\n\nRequirement: Remove placard installed in accordance with original issue of this Directive. Install in a suitable position in full view of the pilot a placard stating:-\n\n    Engine ground running is to be conducted with flaps set at 0o.\n    During engine ground running the control column should be held firmly against the forward horizontal stabiliser control stops. The horizontal stabiliser gust lock should not be fitted during ground runs.\n\nNote: Nomad ASB ANMB-55-26 Revision 4 refers.\n\nCompliance: Prior to exceeding 25 hours time in service after 2 October 1991.\n\nBackground: The manufacturer has revised the recommended ground running practices to minimise loads on both the horizontal stabiliser and flaps.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment replaces the placard text and therefore changes the operating instruction communicated to pilots: it removes the placard installed under the original issue and requires installation of a new placard mandating flaps at 0°, holding the control column against the forward stabiliser control stops, and prohibiting the use of the horizontal stabiliser gust lock during engine ground running (Requirement). The stated reason is that the manufacturer revised ground-running recommendations to minimise loads on the horizontal stabiliser and flaps (Background). The change is limited in scope to cockpit signage and pilot ground-run behaviour for the specified aircraft models (Applicability, Requirement, Background)."},"complexity_factors":["Narrow applicability: applies only to GAF N22 and N24 series (Applicability).","Simple physical action required: remove one placard and install another with specified wording (Requirement).","Clear operational instructions for pilots: flaps 0°, hold control column forward against forward stabiliser stops, do not fit gust lock (Requirement).","Single firm compliance deadline tied to time-in-service (25 hours after 2 Oct 1991) rather than recurring or technical inspections (Compliance).","Minor ambiguity in implementation language: \"suitable position in full view of the pilot\" leaves placement judgment to installer (Requirement).","Reference to manufacturer service bulletin for potential additional detail (Note), which could create minor dependency on external documents.","No new inspection regimes, certification changes, or complex bureaucratic processes spelled out in the text provided (simplicity reduces complexity)."],"plain_english_summary":"This AD requires owners/operators of GAF N22/N24 aeroplanes to remove the old cockpit placard and install a new, pilot-visible placard that mandates three ground-running actions (flaps 0°, hold control column against forward stabiliser stops, do not fit gust lock). Compliance is required before the aeroplane exceeds 25 hours TIS after 2 Oct 1991.\n\nThe change implements the manufacturer's revised ground-run guidance to reduce stabiliser/flap loads; operators bear the minor cost of placard replacement and any procedural adjustments."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical amendment to a specific Airworthiness Directive. It replaces one placard with another and updates ground running procedures for a single aircraft type. The scope remains tightly focused on the original safety purpose — preventing structural damage during ground engine testing."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined terms implicitly used (Applicability and Compliance)","No cross-references to other legislation or regulations beyond a single manufacturer service bulletin note","Simple linear structure: applicability → requirement → compliance deadline → background","Single unconditional obligation with clear deadline","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires specific fixes or changes to aircraft.\n\n**What it does:**\nThis directive applies to **GAF N22 and N24 series aircraft** (known as \"Nomad\" planes). It orders owners/operators to:\n- **Remove** an old safety placard (warning sign) that was installed under the original version of this directive\n- **Install a new placard** in the cockpit where the pilot can clearly see it, with specific instructions for running engines on the ground\n\n**The new rules for ground running:**\n- Flaps must be set to **0 degrees** (flat, not angled)\n- The pilot must **hold the control column firmly forward** against the stops\n- The **horizontal stabiliser gust lock** (a device that locks the tail during parking) must **NOT** be fitted during ground runs\n\n**Why it matters:**\nThe manufacturer discovered that previous ground running practices were putting **excessive stress on the tail (horizontal stabiliser) and flaps**. These new procedures reduce mechanical loads and prevent potential damage or failure.\n\n**Who must comply:**\nAnyone operating these specific Nomad aircraft models. They must make these changes **before the aircraft accumulates 25 more flight hours after 2 October 1991**.\n\n**Key reference:**\nThe manufacturer issued Service Bulletin ANMB-55-26 Revision 4, which prompted this safety update."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running","history":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running/history","analysis":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running/analysis","conflicts":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running/conflicts","importantCases":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running/important-cases","documents":"/api/acts/ad-gaf-n22-59-amdt-1-engine-ground-running/documents"}}