{"id":"F2005L01061","name":"AD/EMB-120/32 Amdt 1 - Electrical Power System","slug":"ad-emb-120-32-amdt-1-electrical-power-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":34670,"registerId":"commonwealth-F2005L01061-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Embraer EMB-120 (Brasilia) Series Aeropl","sectionType":"division","heading":"Embraer EMB-120 (Brasilia) Series Aeroplanes","content":"### Embraer EMB-120 (Brasilia) Series Aeroplanes\n\n| AD/EMB-120/32 Amdt 1 | Electrical Power System | 6/2005 |\n| -------------------- | ----------------------- | ------ |\n\n| Applicability: | All EMB-120 and EMB-120RT series aeroplanes.                                                                                                                                                                                                |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Modify the aeroplane in accordance with Embraer Service Bulletin 120-24-0051 Revision 05 dated 20 November 2001 or later revision approved by the Brazilian Centro Técnico Aeroespacial (CTA).                                              |\n|                | Note 1: Aeroplanes that have incorporated previous Revisions of SB 120-24-0051 require further action in accordance with revision 05.                                                                                                       |\n|                | Note 2: DAC Brazil AD 93-12-01R2 Amdt 39-940 refers.                                                                                                                                                                                        |\n| Compliance:    | Remains unchanged as ‘Within 1500 hours time in service after the effective date of the original issue of this Directive’.                                                                                                                  |\n|                | This Amendment becomes effective on 9 June 2005.                                                                                                                                                                                            |\n| Background:    | The original issue of this Directive required removal of a LH DC relay box attaching bolt and washer to avoid interference with a relay contact. These actions were additional to those required by AD/EMB-120/10 Amdt 3 and AD/EMB-120/16. |\n|                | The original issue of this Directive superseded AD/EMB-120/10 Amdt 3 and AD/EMB-120/16, which were cancelled.                                                                                                                               |\n|                | This amendment allows compliance to be achieved by using later CTA approved revisions of the SB.                                                                                                                                            |\n|                | The original issue of this Directive became effective on 11 July 2002.                                                                                                                                                                      |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n27 April 2005","sortOrder":0},{"sectionNumber":"AD/EMB-120/32 Amdt 1","sectionType":"part","heading":"AD/EMB-120/32 Amdt 1","content":"## AD/EMB-120/32 Amdt 1","sortOrder":1},{"sectionNumber":"Electrical Power System","sectionType":"part","heading":"Electrical Power System","content":"## Electrical Power System","sortOrder":2},{"sectionNumber":"6/2005","sectionType":"part","heading":"6/2005","content":"## 6/2005","sortOrder":3}],"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":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original narrow scope - a specific electrical modification for one aircraft type. The only change is procedural flexibility allowing newer approved revisions of the manufacturer's service bulletin, which is a standard administrative update without expanding the directive's substantive reach."},"complexity_factors":["Single, specific technical requirement referencing an external manufacturer document","Minimal conditional logic - only one alternative compliance path (later approved revisions)","Two brief notes clarifying grandfathering and related foreign directives","No defined terms section - relies on standard aviation terminology","Straightforward applicability statement covering all aircraft in the series","Single compliance timeframe with no exceptions or extensions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft: the **Embraer EMB-120 (Brasilia)** series.\n\n**What it does:**\n- Requires owners/operators of these Brazilian-made regional aircraft to make a specific electrical system modification\n- The fix involves following Embraer's official Service Bulletin 120-24-0051 (Revision 05 or later approved versions)\n- This amendment updates the original 2002 directive to allow use of newer approved versions of the manufacturer's instructions\n\n**Who it affects:**\n- All operators of EMB-120 and EMB-120RT series aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- Addresses a safety issue with the left-hand DC relay box where a bolt could interfere with relay contacts\n- Prevents potential electrical system failures that could affect flight safety\n- Mandatory compliance required within 1,500 flight hours of the original directive's date\n\n**Key change in this amendment:**\nPreviously, operators had to follow a specific revision of the service bulletin. This amendment allows flexibility to use later revisions, provided they're approved by Brazil's aviation technical authority (CTA)."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment does not broaden the substantive scope of the original directive. It retains the same mandatory modification and the same compliance deadline (1,500 hours). The only practical change is procedural flexibility: it allows operators to comply by using later revisions of the Embraer service bulletin provided those revisions are approved by the Brazilian CTA. It therefore relaxes an implementation constraint without expanding which aircraft are affected or the safety issue addressed."},"complexity_factors":["Single mandatory action (modify per a named Service Bulletin)","Short document with limited conditional logic","Cross-reference to an external technical document: Embraer Service Bulletin 120-24-0051 Rev 05","Dependency on approval by a foreign authority (Brazilian CTA) for later SB revisions","Notes requiring additional action where earlier SB revisions have been previously incorporated","Cross-reference to other ADs (AD/EMB-120/10 Amdt 3, AD/EMB-120/16 and DAC Brazil AD 93-12-01R2 Amdt 39-940)","Fixed compliance window (1,500 hours) — no complex phased timing or exemptions"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- **Who it applies to:** All Embraer EMB-120 and EMB-120RT series aeroplanes.\n- **What must be done:** Each affected aeroplane must be modified in accordance with Embraer Service Bulletin (SB) 120-24-0051 Revision 05 dated 20 November 2001, or a later revision of that SB provided the later revision is approved by the Brazilian Centro Técnico Aeroespacial (CTA).\n- **Timing (compliance):** The compliance timing remains unchanged from the original directive: the modification must be completed within 1,500 hours time in service after the effective date of the original directive.\n- **Notes:** Aeroplanes that have already incorporated earlier revisions of SB 120-24-0051 must take the further actions that are required by Revision 05. The directive also refers to a related Brazilian airworthiness directive (DAC Brazil AD 93-12-01R2 Amdt 39-940).\n\n**Why the directive exists (official statement)**\n\n- The original directive required the removal of a left-hand DC relay box attaching bolt and washer because they could interfere with a relay contact. That action was additional to requirements in two earlier ADs (AD/EMB-120/10 Amdt 3 and AD/EMB-120/16). This amendment does not change the required work; it permits compliance to be demonstrated using later CTA-approved revisions of the Embraer service bulletin.\n\n**Who pays and who decides**\n\n- Operators (aircraft owners/airlines) pay for the modification work, including parts, labour and any downtime. Maintenance organisations or Embraer-authorised repair stations will normally perform the work.\n- The Brazilian CTA (Centro Técnico Aeroespacial) determines which later revisions of the service bulletin are acceptable for compliance. The Civil Aviation Safety Authority (CASA) enforces the directive in Australia through its delegate.\n\n**How behaviour changes**\n\n- Operators must schedule and carry out the modification within the stated flight-hour window (1,500 hours) if it has not already been done.\n- Operators who already used earlier revisions of SB 120-24-0051 may have to perform additional work to meet Revision 05 requirements.\n\n**Implementation, compliance burden and risks**\n\n- Administrative burden: Operators must track compliance status against the 1,500-hour deadline and confirm which SB revision was used on each aeroplane.\n- Direct costs: labour, spare parts and aircraft downtime for each modification. These costs are concentrated on operators of EMB-120 aircraft and on the maintenance providers that perform the work.\n- Implementation risk: Acceptable alternative SB revisions depend on CTA approval; operators must confirm CTA approval of any later SB revision before relying on it for compliance.\n- Interaction with previous directives: This AD replaced earlier ADs (AD/EMB-120/10 Amdt 3 and AD/EMB-120/16), so operators must reconcile records of prior compliance to determine whether further action is required.\n\n**Trade-offs and practical effects to consider**\n\n- The directive enforces a targeted hardware change to avoid electrical interference; that narrows the safety risk but imposes recurring maintenance cost and scheduling impact for affected operators.\n- Allowing later CTA-approved SB revisions provides flexibility that can reduce rework if Embraer releases improved procedures, but it also creates dependence on a foreign authority's approvals (CTA) for satisfying domestic compliance.\n\n**Source sections relied on**\n\n- Applicability, Requirement (service bulletin and CTA approval), Notes on previous revisions, Compliance timeframe, and Background statement included in the AD.\n"}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system","history":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system/history","analysis":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system/analysis","conflicts":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system/conflicts","importantCases":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system/important-cases","documents":"/api/acts/ad-emb-120-32-amdt-1-electrical-power-system/documents"}}