{"id":"F2006B08999","name":"AD/DHC-1/15 - Tail Landing Gear and Lower Surface of Tailplane - Inspection and Modification","slug":"ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52643,"registerId":"commonwealth-F2006B08999-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/15 - Tail Landing Gear and Lower Surface of Tailplane - Inspection and Modification","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)  \nDe Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\nAD/DHC-1/15 Tail Landing Gear and Lower Surface of\n\nTailplane \\- Inspection and Modification\n\n  \n8/62\n\nApplicability: All models.\n\nRequirement: 1. Inspect the lower surface of the tailplane in the vicinity of the shock absorber attachment bracket, for buckling and other damage. Model TMK 10 aircraft in which buckling or other damage is present shall be repaired and modified in accordance with Chipmunk Modification H.167. All other models shall be repaired in accordance with an approved repair scheme.\n\n    2. Inspect the shock absorber upper attachment bracket for security, elongation of bolt holes and other damage.\n\n    3. Remove the shock absorber upper and lower attachment bolts and inspect for excessive wear, cracks, evidence of shearing and other damage.\n\nCompliance: For paragraph 1 \\-\n\n    (a) Inspect all model TMK 10 aeroplanes not modified in accordance with Chipmunk Modification H.167 - daily and after each heavy landing.\n\n    (b) Inspect all model TMK 10 aeroplanes modified in accordance with Chipmunk Modification H.167 and all other models of Chipmunk aeroplanes at intervals not exceeding 100 hours time in service and after each heavy landing.\n\nFor paragraph 2 and 3 \\- Inspect all models at intervals not exceeding 100 hours time in service and after each heavy landing.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1925},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument maintains a narrow, technical scope focused solely on tail landing gear and tailplane structural integrity for a specific aircraft type, consistent with standard airworthiness directive format."},"complexity_factors":["Conditional compliance schedules based on aircraft model (TMK 10 vs others) and modification status","Technical aviation terminology requiring knowledge of aircraft structures (tailplane, shock absorber, time in service)","Cross-reference to external technical modification document (Chipmunk Modification H.167) not defined in the instrument","Multiple inspection requirements with different frequencies for different components"],"plain_english_summary":"This mandatory Airworthiness Directive applies to anyone who owns or operates a De Havilland DHC‑1 Chipmunk. It requires targeted inspections of the tailplane attachment at the tail‑wheel shock absorber, the shock‑absorber bracket, and the attachment bolts, with repairs per model (TMK‑10 must use factory Modification H.167 if damaged).\n\nTMK‑10s without H.167 need daily checks and after hard landings; all others every 100 flight hours and after hard landings. The AD prevents undetected tail damage that could cause loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification","history":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification/history","analysis":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification/analysis","conflicts":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification/important-cases","documents":"/api/acts/ad-dhc-1-15-tail-landing-gear-and-lower-surface-of-tailplane-inspection-and-modification/documents"}}