{"id":"F2006B03092","name":"AD/B747/190 Amdt 1 - Instrument Landing System Receivers","slug":"ad-b747-190-amdt-1-instrument-landing-system-receivers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42464,"registerId":"commonwealth-F2006B03092-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"“Category II and III operations are proh","sectionType":"part","heading":"“Category II and III operations are prohibited.”, and","content":"# “Category II and III operations are prohibited.”, and\n\n(ii) Revise Limitations Section of the AFM to include the following statement:","sortOrder":0}],"analysis":{"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":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard airworthiness directive amendment focused on a specific equipment safety issue. The scope remains tightly constrained to ILS receiver modifications on B747 aircraft, with no evidence of scope creep beyond the original safety purpose."},"complexity_factors":["Multiple cross-references to manufacturer service bulletins (SB M-4426, RIA-35B-34-6) and FAA AD 99-10-14","Specific part numbers and fault codes requiring technical aviation knowledge to interpret","Conditional compliance paths: inspection → if fault found → replacement OR modification → terminating action","Nested requirements: Requirement 1(a) inspection triggers Requirement 2 action, which enables Requirement 4 terminating action","Technical aviation terminology (AFM, P/N, flight cycles, Category II/III operations) without plain English definitions","Garbled text in the source document (repeated truncated phrases) creates parsing ambiguity"],"plain_english_summary":"This CASA airworthiness directive restricts Category II/III (low-visibility) landings for Boeing 747s fitted with AlliedSignal RIA-35B ILS receivers because they can fail with hidden faults. It requires repetitive inspections for specific fault indications and mandates replacing or modifying faulty units; found units may not be reinstalled.\n\nReplacing all affected receivers with the modified part removes the landing restriction and inspection requirement. It affects operators of 747s with these ILS units and prevents unsafe reliance on faulty guidance equipment."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment extends beyond periodic inspections by mandating modification or replacement of all affected RIA‑35B receivers (PN 066-50006-0101) to PN 066-50006-1101 per SB M-4426 Rev 3 and by requiring AFM/placard wording that Category II/III operations are prohibited until compliance. The original inspection interval requirement (prior to 2 Oct 1998 and thereafter at intervals not to exceed 64 flight cycles) remains unchanged."},"complexity_factors":["Technical avionics detail: specific ILS receiver model (RIA-35B) and discrete fault codes (“N1”, “Nm”) required for action","Multiple part numbers with a mandatory conversion from 066-50006-0101 to 066-50006-1101","Cross-reference to an external service bulletin (SB M-4426 Revision 3) as the required modification procedure","Operational limitation: mandatory AFM/placard change prohibiting Category II and III operations until compliance","Compliance timing expressed in flight cycles (prior to 2 October 1998 and thereafter at ≤64 flight cycles)","Installation prohibition: discrepant receivers may not be re-installed unless modified per the SB","Terminating action mechanism: fleet-wide replacement/modification removes repetitive inspection and placard requirements"],"plain_english_summary":"This directive requires operators of aeroplanes with RIA‑35B ILS receivers P/N 066-50006-0101 to inspect the receivers’ internal fault memory at specified intervals and to not conduct Category II and III operations until the AFM/placard is amended to show that prohibition. If fault codes “N1” or “Nm” are found, the receiver must be replaced or modified per AlliedSignal SB M-4426 Rev 3; modified units are re‑identified P/N 066-50006-1101 and remove the need for repetitive inspections. Operators bear inspection and modification/replacement costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers","history":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers/history","analysis":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers/analysis","conflicts":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers/conflicts","importantCases":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers/important-cases","documents":"/api/acts/ad-b747-190-amdt-1-instrument-landing-system-receivers/documents"}}