{"id":"F2008L02130","name":"AD/EMB-145/3 - Pitot and TAT Current Sensor Relays","slug":"ad-emb-145-3-pitot-and-tat-current-sensor-relays","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74361,"registerId":"commonwealth-F2008L02130-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Embraer EMB-135 and EMB-145 Series Aerop","sectionType":"division","heading":"Embraer EMB-135 and EMB-145 Series Aeroplanes","content":"### Embraer EMB-135 and EMB-145 Series Aeroplanes\n\n| AD/EMB-145/3 | Pitot and TAT Current Sensor Relays | 8/2008 DM |\n| ------------ | ----------------------------------- | --------- |\n\n| Applicability: | EMB-145 aircraft models with serial numbers (S/N) 145002 through 145362, 145364 through 145590 and 145592 through 14500987, all inclusive. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. If not previously accomplished, perform a detailed inspection (DET) on Pitot 1 (K0053), Pitot 2 (K0054), TAT 1 (K0064) and TAT 2 (K0494) current sensor relays for possible damage caused by overheating of their contacts, enclosure and finishing material in accordance with either Embraer Service Bulletin (SB)145-30-0052 initial issue or SB 145LEG-30-0019 initial issue, as applicable, or later revisions approved by the Brazilian Agência Nacional de Avição Civil (ANAC). If current sensor relays K0053, K0054, K0064 and K0494 are not found to be damaged, they can be reinstalled on the aircraft. |\n| | Note 1: The “145LEG” series of Embraer Service Bulletins only applies to Legacy executive jets. |\n| | 2. If, as a result of the Requirement 1 inspection, any of the current sensor relays K0053, K0054, K0064 and K0494 is found to be damaged, replace it with a new relay of the same part number (P/N) CS500-060-D4A in accordance with either SB 145-30-0052 or SB 145LEG-30-0019, as applicable, or later revision approved by the ANAC. |\n| | 3. If not previously accomplished, perform a DET on Pitot 1 (XK0053), Pitot 2 (XK0054), TAT 1 (XK0064) and TAT 2 (XK0494) sockets for possible damage caused by overheating of their contacts, enclosure and finishing material in accordance with either SB 145-30-0052 or SB 145LEG-30-0019, as applicable, or later revisions approved by the ANAC. |\n| | 4. If, as a result of the Requirement 2 inspection: |\n| | a. Sockets XK0053, XK0054, XK0064 and XK0494 that are not found to be damaged can be reused - Accomplish a rework to replace electrical contacts A1 and C1 with new ones, P/N M39029/92-536, in accordance with either SB 145-30-0052 or SB 145LEG-30-0019, as applicable, or later revisions approved by the ANAC. After being reworked, the sockets must be re-identified from P/N S500-9140 to S500-9140-A and the electrical codes must be changed from XK0053, XK0054, XK0064 and XK0494 to XK1243, XK1242, XK1245 and XK1244, respectively. |\n| | b. Any socket XK0053, XK0054, XK0064 or XK0494 that is found to be damaged, replace it with new socket, P/N S500-9140-A or S500-9216, in accordance with either SB 145-30-0052 or SB 145LEG-30-0019, as applicable, or later revisions approved by the ANAC. |\n| | Note 2: For the purpose of this Directive, a detailed inspection (DET) is: “An intensive examination of a specific item, installation or assembly to detect damage, failure or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirrors, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate access procedures may be required.” |\n| | Note 3: ANAC AD 2007-11-04R1 refers. |\n| Compliance: | For Requirements 1 and 3 - Within the next 2 500 hours time in service after 21 December 2007 (the effective date of ANAC AD 2007-11-04R1) or before 21 December 2009, whichever occurs first. |\n| | For Requirements 2 and 4 - Before further flight after the Requirement 1 or 3 DET. |\n| | This Airworthiness Directive becomes effective on 23 June 2008. |\n| Background: | The ANAC has advised that occurrences of smoke on the flight deck originating from Pitot 1/2 and TAT 1/2 current sensor relays and their respective sockets have been reported. The smoke was caused by poor electrical contacts between those relays and their sockets.This Directive requires detailed inspections of the relays and their sockets and, if necessary, replacement of the relays and sockets together with rework of some undamaged sockets. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n16 June 2008","sortOrder":0},{"sectionNumber":"AD/EMB-145/3","sectionType":"part","heading":"AD/EMB-145/3","content":"## AD/EMB-145/3","sortOrder":1},{"sectionNumber":"Pitot and TAT Current Sensor Relays","sectionType":"part","heading":"Pitot and TAT Current Sensor Relays","content":"## Pitot and TAT Current Sensor Relays","sortOrder":2},{"sectionNumber":"8/2008 DM","sectionType":"part","heading":"8/2008 DM","content":"## 8/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, single-purpose scope: addressing a specific safety defect (overheating relays/sockets) in specific aircraft models. The scope remains tightly constrained to the original safety issue identified by ANAC."},"complexity_factors":["Multiple conditional pathways: Requirements 1-4 create a decision tree (inspect → if damaged replace, if not damaged rework/reinstall)","Specific part numbers referenced throughout (K0053, K0054, K0064, K0494, XK0053, XK0054, XK0064, XK0494, CS500-060-D4A, M39029/92-536, S500-9140, S500-9140-A, S500-9216)","Dual compliance paths depending on aircraft type: references to both SB 145-30-0052 (standard) and SB 145LEG-30-0019 (Legacy executive jets only)","Cross-references to foreign regulatory instruments: ANAC AD 2007-11-04R1 and Brazilian Agência Nacional de Aviação Civil approvals","Serial number ranges with gaps (excludes S/N 145363, 145591, and presumably 14500988+) requiring careful parsing","Re-identification requirements for reworked parts (changing electrical codes from XK0053 etc. to XK1243, XK1242, XK1245, XK1244)","Nested compliance deadlines: one deadline for inspections, immediate-action requirement for replacements"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and, if needed, repair or replacement of electrical relays and sockets tied to pitot and TAT sensors on affected Embraer EMB‑135/145 series aircraft. It responds to reported overheating and cockpit smoke from poor electrical contacts.\n\nOwners/operators of the specified EMB‑145 fleet must comply within the required timeframes to eliminate fire/smoke risk and ensure continued safe flight operations."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive applies to EMB‑145 aircraft within the listed serial-number ranges and addresses Pitot/TAT current-sensor relays and sockets as specified (Applicability; Requirement). It cites and implements inspections, replacements and rework per Embraer service bulletins and references ANAC AD 2007-11-04R1 (Note 3). The text shows no indication that the Directive broadens or narrows scope beyond the original ANAC advisory; it restates and enforces that corrective scope and specified compliance windows."},"complexity_factors":["Multiple, specific aircraft serial-number applicability increases scope-checking burden (Applicability).","Several discrete actions: DET inspections of four relays and four sockets, conditional replacements, and selective rework (Requirement 1–4).","Tight conditional compliance: replacements and rework must be done before further flight if damage is found (Requirement 2 and 4; Compliance).","Two different compliance time triggers: within 2,500 flight hours after 21 Dec 2007 or before 21 Dec 2009, whichever first (Compliance).","Dependency on external service documents and regulator approvals: work per Embraer SB 145-30-0052 or SB 145LEG-30-0019, or later ANAC-approved revisions (Requirement 1–4).","Detailed re-identification and electrical-code changes required after rework (Requirement 4a), adding parts-tracking and documentation tasks.","Multiple part numbers and interchangeable replacement options (relays P/N CS500-060-D4A; sockets P/N S500-9140-A or S500-9216; contact P/N M39029/92-536) increase logistic complexity (Requirement 2 and 4).","Technical inspection standard specified (DET definition, Note 2) requires enhanced tools, lighting, and possible disassembly, raising labour intensity.","Cross-reference to prior ANAC AD means operators must reconcile this Directive with the referenced AD (Note 3)."],"plain_english_summary":"This Airworthiness Directive requires detailed inspections of specific Pitot and Total Air Temperature (TAT) current-sensor relays and their sockets on Embraer EMB‑145 series aircraft with listed serial numbers. Damaged relays or sockets must be replaced with specified part numbers, and some undamaged sockets must be reworked and re‑identified. The rule enforces timing (inspect within 2,500 flight hours or by 21 Dec 2009; replace before next flight) to address reported smoke caused by poor electrical contacts."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays","history":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays/history","analysis":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays/analysis","conflicts":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays/conflicts","importantCases":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays/important-cases","documents":"/api/acts/ad-emb-145-3-pitot-and-tat-current-sensor-relays/documents"}}