{"id":"F2005L02844","name":"AD/CESSNA 525/5 - Engine Fire Extinguisher Bottle Wiring Identification","slug":"ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":37852,"registerId":"commonwealth-F2005L02844-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 525 Series Aeroplanes","sectionType":"division","heading":"Cessna 525 Series Aeroplanes","content":"### Cessna 525 Series Aeroplanes\n\n| AD/CESSNA 525/5 | Engine Fire ExtinguisherBottle Wiring Identification | 11/2005 |\n| --------------- | ---------------------------------------------------- | ------- |\n\n```html\n

Applicability:

Cessna 525 series aeroplanes as follows:

Model

525
525A
525B

Serial Number Range

525-0001 through 525-0600
525A-0001 through 525A-0234
525B-0001 through 525B-0035

Requirement:

1. Install identification sleeves on the wires for both engine fire extinguisher bottles in accordance with the following applicable Cessna Citation Service Bulletin (SB):

a. SB525-26-01 dated 5 April 2005,

b. SB525A-26-02 dated 5 April 2005, or

c. SB525B-26-01 dated 5 April 2005.

2. Reconnect the wires to both engine fire extinguisher bottles and test the wires for correct installation in accordance with the applicable Citation SB listed in Requirement 1.

Note: FAA AD 2005-17-11 Amdt 39-14232 refers.

Compliance:

For Requirement 1 - Within the next 60 days or 100 hours time-in-service after the effective date of this Directive, whichever occurs first.

For Requirement 2 - Before further flight after Requirement 1 is accomplished.

This Airworthiness Directive becomes effective on 27 October 2005.

Background:

The United States Federal Aviation Administration (FAA) has received reports of wires incorrectly connected to the engine fire extinguisher bottles. This Directive requires the installation of identification sleeves on the wiring for both engine fire extinguisher bottles.

\n```\n\n| | The Directive is issued to prevent incorrect installation of the wires to the engine fire extinguisher bottles, which could result in failure of the engine fire extinguisher bottles to discharge when activated. This failure could lead to the inability to control an engine fire. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n15 September 2005","sortOrder":0},{"sectionNumber":"AD/CESSNA 525/5","sectionType":"part","heading":"AD/CESSNA 525/5","content":"## AD/CESSNA 525/5","sortOrder":1},{"sectionNumber":"Engine Fire ExtinguisherBottle Wiring Id","sectionType":"part","heading":"Engine Fire ExtinguisherBottle Wiring Identification","content":"## Engine Fire Extinguisher \nBottle Wiring Identification","sortOrder":2},{"sectionNumber":"11/2005","sectionType":"part","heading":"11/2005","content":"## 11/2005","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring identification issue on specific Cessna aircraft models. There is no evidence of scope creep; it remains a targeted safety directive for a discrete technical problem."},"complexity_factors":["Single, discrete technical requirement with only two sequential steps","Limited applicability — only three specific aircraft models with defined serial number ranges","No defined terms section or interpretive provisions","No cross-references to other legislation (only references to Cessna Service Bulletins and a related FAA AD in a non-binding note)","Simple conditional compliance deadline (60 days OR 100 hours — whichever occurs first)","Straightforward background explanation without nested exceptions or carve-outs"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of specified Cessna 525/525A/525B jets (early serial ranges) to fix a potentially deadly miswiring of engine fire-extinguisher bottle circuits. Within 60 days or 100 flight hours fit identification sleeves, then reconnect and test the extinguisher wiring before the next flight to ensure the fire bottles will discharge when needed."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive is narrowly focused on preventing incorrect wiring of engine fire‑extinguisher bottles by requiring identification sleeves and a reconnection/test. It does not broaden regulatory reach beyond that original safety objective, nor add unrelated obligations or new classes of affected aircraft. The measures align closely with the stated original purpose."},"complexity_factors":["Short, single‑issue instrument (two principal requirements: install sleeves; reconnect and test).","Limited applicability: three model variants with narrow serial number ranges listed.","References three model‑specific Cessna service bulletins (SB525-26-01; SB525A-26-02; SB525B-26-01) rather than embedding technical detail.","One timing condition: 'within 60 days or 100 hours time‑in‑service, whichever occurs first' (single conditional).","One operational constraint: reconnection/testing must be completed 'before further flight' after Requirement 1.","External cross‑reference to FAA AD 2005-17-11 for background only."],"plain_english_summary":"**What the directive requires (mechanics)\n\n- Install identification sleeves on the wires for both engine fire‑extinguisher bottles on affected Cessna 525 series aeroplanes, following the applicable Cessna Citation Service Bulletin (SB525-26-01, SB525A-26-02 or SB525B-26-01 dated 5 April 2005). (Requirement 1)\n- Reconnect the wires to both bottles and test them for correct installation per the same service bulletin. The testing and reconnection must be completed before the aeroplane next flies. (Requirement 2)\n- The work must be completed within 60 days or 100 flight hours after the directive’s effective date, whichever comes first. (Compliance)\n\nWhich aircraft are affected\n\n- Cessna 525 series: models 525, 525A, 525B with serial numbers listed in the directive (525-0001 through 525-0600; 525A-0001 through 525A-0234; 525B-0001 through 525B-0035). (Applicability)\n\nWhy this matters (stated purpose and practical effect)\n\n- The issuing authority states the FAA received reports of the extinguisher bottle wiring being connected incorrectly. If wiring is incorrect, the engine fire extinguisher bottles may fail to discharge when activated, which could prevent control of an engine fire. The directive’s stated purpose is to reduce that risk by making the wiring identifiable and verifying correct connections. (Background; Purpose)\n\nWho pays and who decides\n\n- Aircraft owners/operators pay for parts (identification sleeves, any replacement wiring/connectors) and labour to perform the installation, reconnection and test. Maintenance must be carried out by personnel authorised to work on the aeroplane and certified where required; the operator (or their approved maintenance organisation) decides when to schedule the work within the mandated compliance window. The regulator enforces compliance. (Requirement and Compliance)\n\nCosts, trade‑offs and implementation risks\n\n- Direct cost: low to moderate one‑off expense for parts and labour and short aircraft downtime within the 60‑day/100‑hour window. (Compliance)\n- Benefits are concentrated (reduced risk for each affected aeroplane of miswired extinguisher bottles). Costs are diffuse across the fleet owners/operators. \n- Implementation risk: work quality matters — improper installation or testing could leave the hazard unaddressed; reliance on the service bulletin means operators must follow the SB accurately. \n- Substitution effects: operators may choose in‑house maintenance or contracted shops; service providers will see additional short‑term demand. \n- Administrative scope: the directive is narrowly targeted to a specific wiring identification and test task and references three model‑specific service bulletins and the FAA AD for background. \n\nSource claims vs practical mechanics\n\n- The directive claims it prevents incorrect installation that could prevent bottle discharge. Mechanically, it achieves that by (a) making wiring visibly identifiable with sleeves and (b) requiring reconnection and a functional check. The effectiveness therefore depends on correct installation and testing per the service bulletin. (Requirement 1; Requirement 2; Background)\n\nIf you operate or maintain any affected Cessna 525 in the listed serial ranges, schedule the installation and testing within the compliance window and retain records showing the SB used and that the test was completed before further flight. (Requirements and Compliance)"},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification","history":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification/history","analysis":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification/analysis","conflicts":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification/conflicts","importantCases":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification/important-cases","documents":"/api/acts/ad-cessna-525-5-engine-fire-extinguisher-bottle-wiring-identification/documents"}}