{"id":"F2007L03983","name":"AD/CF6/58 Amdt 1 - Electronic Control Unit Software","slug":"ad-cf6-58-amdt-1-electronic-control-unit-software","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160762,"registerId":"commonwealth-F2007L03983-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"General Electric Turbine Engines - CF6 S","sectionType":"division","heading":"General Electric Turbine Engines - CF6 Series","content":"### General Electric Turbine Engines - CF6 Series\n\n| AD/CF6/58 Amdt 1 | Electronic Control Unit Software | 11/2007 |\n| ---------------- | -------------------------------- | ------- |\n\n```html\n

Applicability:

CF6-80E1A1, CF6-80E1A2, CF6-80E1A3, CF6-80E1A4 and CF6-80E1A4/B turbofan engines.

Note 1: These engines are known to be installed on, but not limited to, Airbus A330 series aeroplanes.

Requirement:

1. Unless already accomplished, remove the following software versions from the engine electrical control unit (ECU):

Table 1

Software Version

ECU Part Number

E.1.D
E.1.F
E.1.G
E.1.H
E.1.I
E.1.J
E.1.K
E.1.L
E.1.M
E.1.N

1799M99P01
1799M99P03
1799M99P04
1799M99P05
1799M99P06, 1799M99P07, 1851M74P01, 1851M80P01
1799M99P08, 1799M99P09, 1851M74P02, 1851M80P02
1799M99P10, 1851M74P03, 1851M80P03, 1960M84P01
1799M99P11, 1851M74P04, 1851M80P04, 1960M84P02
1799M99P12, 1851M74P05, 1851M80P05, 1960M84P03
1799M99P13, 1851M74P06, 1851M80P06, 1960M84P04, 2043M29P01, 2043M29P02

2. Until 31 January 2008, once an ECU containing a software version not listed in Table 1 is installed on an engine, that ECU can be replaced with an ECU containing a previous version of software listed in Table 1.

3. Once the software version listed in Table 1 has been removed and new FAA-approved software version is installed in an ECU, reverting to those older software versions in that ECU is prohibited.

4. Use of an ECU with a software version listed in Table 1 is prohibited.

\n```\n\n| | Note 2: Information on removing ECU software and installing new software, which provides increased margin to flameout, can be found in GE Service BulletinCF6-80E1 S/B 73-0091, Revision 1, dated 26 June 2007. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Note 3: FAA AD 2007-17-01 Amdt 39-15159 refers. |\n| Compliance: | For Requirement 1 - Before 31 January 2008. |\n| | For Requirements 2 and 3 - As of the effective date of this Amendment. |\n| | For Requirement 4 - After 31 January 2008. |\n| | This Amendment becomes effective on 25 October 2007. |\n| Background: | The original issue of this Directive required removing ECU software version E.1.M. or earlier installed software and installing improved software for the ECU. |\n| | This Amendment is complementary to AD/A330/57 Amdt 2 and replaces the original issue of this Directive. This Amendment requires removing software version E.1.N or earlier from the engine ECU. Engines with the new version software will have increased margin to flameout. Both this Amendment and the original issue of this Directive results from reports of engine flameout events during flight, including reports of events where all engines simultaneously experienced a flameout or other adverse operation. Although the root cause investigation is not yet complete, the United States Federal Aviation Administration (FAA) believe that exposure to ice crystals during flight is associated with these flameout events and that further rulemaking may be necessary. |\n| | This Amendment is issued to minimize the potential of an all-engine flameout event caused by ice accretion and shedding during flight. |\n| | The original issue of this Directive became effective on 4 August 2005. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n7 September 2007","sortOrder":0},{"sectionNumber":"AD/CF6/58 Amdt 1","sectionType":"part","heading":"AD/CF6/58 Amdt 1","content":"## AD/CF6/58 Amdt 1","sortOrder":1},{"sectionNumber":"Electronic Control Unit Software","sectionType":"part","heading":"Electronic Control Unit Software","content":"## Electronic Control Unit Software","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This Amendment expands the software versions required to be removed: the original Directive addressed software version E.1.M or earlier, while this Amendment requires removal of E.1.N or earlier and replaces the original issue (Background). The Amendment is complementary to AD/A330/57 Amdt 2 and references GE service guidance and an FAA AD (Background; Note 2; Note 3)."},"complexity_factors":["Technical specificity: the Directive names precise software versions and multiple ECU part numbers to be removed (Table 1).","Multiple staged deadlines and exceptions: different compliance timings for Requirements 1–4 and temporary reversion permission until 31 January 2008 (Compliance; Requirements 1–4).","Operational burden on operators: aircraft owners/operators and maintenance organisations must perform ECU software removals/installs and thereafter cannot revert to prohibited versions (Requirement 1; Requirement 3; Requirement 4).","Dependency on external approvals and instructions: installation guidance and safety rationale reference GE Service Bulletin CF6‑80E1 S/B 73‑0091 Rev 1 and FAA AD 2007‑17‑01 (Note 2; Note 3).","Enforcement and delegation: issued by CASA (delegate signature) but tied to FAA approvals, creating cross‑jurisdictional interplay (signature block; Note 3).","Safety trade‑off clarity: the Directive asserts increased margin to flameout but notes the root cause investigation is incomplete, implying further rulemaking may follow (Background)."],"plain_english_summary":"Requires removal of specified older electronic control unit (ECU) software from General Electric CF6‑80E1 engines and bans its use once replaced with FAA‑approved updated software. Operators and maintenance organisations must install the update to increase flameout margin; the rule applies to aircraft fitted with these engine variants and aims to reduce the risk of flameout linked to ice crystal exposure."},"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":true,"description":"The original 2005 directive required removal of software version E.1.M or earlier. This 2007 amendment expands the scope to also require removal of version E.1.N, reflecting new safety data and an expanded understanding of the ice crystal flameout risk. The amendment also adds the temporary grace period provision (Requirement 2) and the prohibition on reversion (Requirement 3), which were not in the original directive."},"complexity_factors":["Single, clearly defined applicability (5 specific engine models)","Straightforward table of prohibited software versions (10 versions) and corresponding part numbers","Simple temporal compliance structure (single deadline of 31 January 2008)","Limited conditional logic (only one temporary exception allowing backward compatibility until deadline)","No nested definitions or extensive cross-referencing (only references to FAA AD and GE Service Bulletin for technical implementation details)","Clear, sequential numbering of requirements (1-4)","Background section provides plain English explanation of safety rationale"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of GE CF6-80E1 engines (primarily on A330s) to remove outdated ECU software versions and install FAA-approved updates by 31 January 2008. It affects airlines and maintenance organisations and bars reverting to old software. The update prevents engine flameouts caused by ice-crystal ingestion at cruise altitude, addressing reports of simultaneous multi-engine shutdowns and closing a gap identified after the original 2005 directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software","history":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software/history","analysis":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software/analysis","conflicts":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software/conflicts","importantCases":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software/important-cases","documents":"/api/acts/ad-cf6-58-amdt-1-electronic-control-unit-software/documents"}}