{"id":"F2006B11179","name":"AD/LTS/16 - Rigid Tube Fuel Manifold","slug":"ad-lts-16-rigid-tube-fuel-manifold","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56878,"registerId":"commonwealth-F2006B11179-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nAllied Signal (Lycoming) Turbine Engines \\- LTS 101 Series","sortOrder":0},{"sectionNumber":"AD/LTS/16 Rigid Tube Fuel Manifold 4/200","sectionType":"part","heading":"AD/LTS/16 Rigid Tube Fuel Manifold 4/2002","content":"# AD/LTS/16 Rigid Tube Fuel Manifold 4/2002\n\nApplicability: LTS 101 Series turboshaft engines with the following part number (P/N’s) rigid fuel tube manifolds installed:","sortOrder":1},{"sectionNumber":"Table 1. P/N’s of Applicable Rigid Tube ","sectionType":"part","heading":"Table 1. P/N’s of Applicable Rigid Tube Fuel Manifolds","content":"## Table 1. P/N’s of Applicable Rigid Tube Fuel Manifolds\n\n| 4 - 301 - 042 - 02 | 4 - 301 - 042 - 06 | 4 - 301 - 236 - 03 | 4 - 301 - 286 - 02 |\n| ------------------ | ------------------ | ------------------ | ------------------ |\n| 4 - 301 - 042 - 04 | 4 - 301 - 236 - 01 | 4 - 301 - 236 - 04 | 4 - 301 -376 - 01  |\n| 4 - 301 - 042 - 05 | 4 - 301 - 236 -02  | 4 - 301 - 286 - 01 |                    |\n\nRequirement: Remove applicable rigid fuel manifolds, and replace with serviceable manifolds.\n\nServiceable fuel manifolds can include those with P/N’s that are listed in Table 1 of this Directive provided they do not meet any of the following criteria:\n\n    The manifold has accumulated 3,000 or more total Gas generator (Ng) cycles; or\n\n    ii. the manifold has had partial tube replacements; or\n\n    iii. the manifold has an unknown number of (Ng) cycles.\n\nNote. FAA AD 2001-22-07 refers.","sortOrder":2},{"sectionNumber":"Allied Signal (Lycoming) Turbine Engines","sectionType":"part","heading":"Allied Signal (Lycoming) Turbine Engines - LTS 101 Series","content":"## Allied Signal (Lycoming) Turbine Engines \\- LTS 101 Series\n\nAD/LTS/16 (continued)\n\nCompliance: Replace rigid fuel manifolds as per the following schedule:","sortOrder":3},{"sectionNumber":"Table 2 Fuel Tube Replacement Schedule","sectionType":"part","heading":"Table 2 Fuel Tube Replacement Schedule","content":"## Table 2 Fuel Tube Replacement Schedule\n\n| Ng Cycles since New (CSN), orCycles in Service (CIS) since total tube replacement | Replacement Schedule                                                                                                                                         |\n| --------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| 1. 2,750 or less                                                                  | Before accumulating 3,000 total Ng cycles                                                                                                                    |\n| 2. More than 2,750                                                                | Within 250 CIS after the effective date of this AD.                                                                                                          |\n| 3. Unknown                                                                        | Within 2000 CIS after the effective date of this AD; or2. at the next engine removal; or3. at the removal of the fuel manifold for cause;whichever is first. |\n\nThis Airworthiness Directive becomes effective on 18 April 2002.\n\nBackground: This Directive has been issued to prevent engine fuel leakage due to low cycle fatigue cracking of the rigid tube fuel manifold. The FAA has determined that resultant leakage could result in an in-flight fire. Replacement of the applicable manifolds per the replacement schedule will prevent fuel leakage from occurring.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 10 March 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 27 March 2002.","sortOrder":4}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive enforces replacement of specified rigid fuel manifolds on LTS 101 engines to address the stated unsafe condition. It does not expand applicability beyond the listed part numbers or impose requirements beyond the replacement schedule and serviceability criteria set out in the AD; it aligns with the FAA AD but does not broaden scope."},"complexity_factors":["Technical criteria based on gas‑generator (Ng) cycles (thresholds at 2,750 and 3,000 Ng cycles) require accurate tracking of engine cycles (Compliance Table 2).","Serviceability exclusions: manifolds are unacceptable if they have 3,000+ Ng cycles, partial tube replacements, or unknown Ng cycles (Requirement).","Multiple specific part numbers listed across a table create discrete applicability (Applicability; Table 1).","Different replacement timetables depending on known CSN/CIS or unknown history, including options tied to next engine removal or manifold removal for cause (Compliance Table 2, item 3).","Operational burden: verifying manifold history and sourcing compliant replacement manifolds within mandated windows (Requirement; Compliance).","Reference to external regulatory action (FAA AD 2001-22-07) introduces cross-jurisdictional alignment but no additional procedural detail (Note)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Allied Signal (Lycoming) LTS 101 turboshaft engines fitted with certain rigid fuel tube manifold part numbers to remove and replace those manifolds with “serviceable” ones. CASA says the change is to prevent fuel leakage from low‑cycle fatigue cracking that could lead to an in‑flight fire. Operators must track gas‑generator (Ng) cycles and follow a cycle‑based replacement timetable; owners/operators pay for replacements and CASA enforces compliance."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a narrow, specific safety purpose: addressing fatigue cracking in particular fuel manifolds. The scope remains tightly focused on the identified unsafe condition and has not expanded beyond the original safety intent."},"complexity_factors":["Short, single-purpose directive with one primary requirement (replacement of specific parts)","Only 12 specific part numbers affected, listed in a single table","Three-tier compliance schedule based on engine cycle counts, but logic is straightforward (if/then structure)","Minimal defined terms (only 'Ng cycles', 'CSN', 'CIS' explained through context)","Single cross-reference to FAA AD 2001-22-07 for background only","No nested exceptions or conditional sub-clauses beyond the serviceability criteria (three simple disqualifiers)"],"plain_english_summary":"This CASA safety order requires owners/operators of Allied Signal (Lycoming) LTS 101 turboshaft engines to remove and replace specified rigid fuel-tube manifolds because heat‑cycle cracking can cause fuel leaks and in‑flight fires. Replacements must be “serviceable” (meet cycle‑count and repair‑history conditions), with compliance timing set according to each manifold’s usage history. It mirrors the FAA AD and aims to eliminate the fire/explosion hazard from cracked fuel manifolds."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold","history":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold/history","analysis":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold/analysis","conflicts":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold/conflicts","importantCases":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold/important-cases","documents":"/api/acts/ad-lts-16-rigid-tube-fuel-manifold/documents"}}