{"id":"F2005L01743","name":"AD/B717/17 - Brake Fuses","slug":"ad-b717-17-brake-fuses","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35824,"registerId":"commonwealth-F2005L01743-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 717 Series Aeroplanes","sectionType":"division","heading":"Boeing 717 Series Aeroplanes","content":"### Boeing 717 Series Aeroplanes\n\n| AD/B717/17 | Brake Fuses | 8/2005 |\n| ---------- | ----------- | ------ |\n\n```html\n

Applicability:

Boeing Model 717-200 aeroplanes, fuselage numbers 5002 through 5134 inclusive.

Requirement:

1. Replace the eight brake fuses of the hydraulic quantity limiter by doing either Option 1 or Option 2 in Table 1 of this Directive in accordance with Boeing Alert Service Bulletin 717-32A0031, dated 10 September 2004.

Table 1. - Replacement

Option

Replace eight fuses having part number
(P/N) 7918282-5503 with-

1

New fuses having P/N 7918282-5505.

2

Modified and reidentified fuses having P/N 7918282-5505.

Note 1: Boeing Alert Service Bulletin 717-32A0031 refers to Parker Hannifin Corporation Stratoflex Products Division Service Bulletin 836SD-8-6-20, Revision 1, dated 23 June 2004, as an additional source of service information for modifying and reidentifying the brake fuses.

2. Do not install a brake fuse, P/N 7918282-5503, on any aeroplane.

Note 2: FAA AD 2005-11-03 Amdt 39-14105 refers.

Compliance:

  1. In accordance with Table 2 of this Directive.

Table 2. - Compliance Times

For aeroplanes having-

Compliance time

(1) Less than 5,000 total flight cycles as of the effective date of this Directive.

Within 3,600 flight cycles after the effective date of this Directive.

(2) 5,000 or more total flight cycles as of the effective date of this Directive.

Within 1,500 flight cycles after the effective date of this Directive.

2. After the effective date of this Directive.

\n```\n\n| | This Airworthiness Directive becomes effective on 4 August 2005. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | This Directive was prompted by reports indicating that brake fuses of the hydraulic quantity limiter of the main landing gear have failed. Replacement of the fuses is to prevent loss of both hydraulic and brake systems if one fuse on each hydraulic system were to fail simultaneously, and consequent reduced controllability of the aeroplane. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n24 June 2005","sortOrder":0},{"sectionNumber":"AD/B717/17","sectionType":"part","heading":"AD/B717/17","content":"## AD/B717/17","sortOrder":1},{"sectionNumber":"Brake Fuses","sectionType":"part","heading":"Brake Fuses","content":"## Brake Fuses","sortOrder":2},{"sectionNumber":"8/2005","sectionType":"part","heading":"8/2005","content":"## 8/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains focused on replacing a specific defective part and banning its further installation for the named Boeing 717-200 serial range. The Directive does not expand applicability or introduce new operational restrictions beyond replacement, prohibition, and cycle-based compliance times (Applicability; Requirement; Compliance Table 2)."},"complexity_factors":["Precise applicability to a narrow fleet subset (Boeing 717-200, fuselage nos. 5002–5134) increases administrative tracking (Applicability).","Specific part-number replacement requirement and prohibition on reinstalling old P/N impose strict inventory and procurement actions for operators (Requirement 1–2, Table 1).","Two compliance options (new or modified/reidentified fuses) reference external service documents, requiring coordination with Boeing and Parker Hannifin service bulletins for conformity (Requirement 1; Note 1).","Compliance timing tiers tied to total flight cycles create record-checking and scheduling burdens and may force prioritisation of higher-cycle aircraft (Compliance; Table 2).","Cross-reference to FAA AD as related authority may require operators to consult multiple regulatory and manufacturer documents to confirm technical steps (Note 2)."],"plain_english_summary":"This Directive requires operators of Boeing 717-200 aeroplanes (fuselage numbers 5002–5134) to replace eight specific brake fuses (P/N 7918282-5503) with new or modified fuses (P/N 7918282-5505) per the Boeing Alert Service Bulletin, and prohibits reinstalling the old part number. Compliance times depend on an aeroplane’s total flight cycles. The mechanical change aims to prevent simultaneous fuse failures that could cause loss of hydraulic and brake systems and reduced controllability."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose — replacing defective brake fuses on a particular aircraft model. The scope remains tightly focused on the original safety issue identified (brake fuse failures) and has not expanded beyond this technical maintenance requirement."},"complexity_factors":["Short, single-purpose directive with clear mechanical requirements","Two simple alternative compliance options (new parts vs modified parts)","Two-tier compliance schedule based on flight cycles (usage hours equivalent)","References external technical documents (Boeing Service Bulletin and Parker Hannifin Service Bulletin) but does not incorporate them by full text","No nested definitions or interpretation sections","Clear applicability limited to specific fuselage number range","Single prohibition clause (do not install old part number)"],"plain_english_summary":"This AD mandates replacement or modification of brake fuses on Boeing 717-200 aeroplanes (fuselage numbers 5002–5134) because fuse failures could lead to simultaneous loss of both hydraulic systems and brakes, greatly increasing landing and control risk. \n\nOperators must install the improved fuse or re-identify existing units within the flight-cycle deadlines (shorter intervals for higher-use aircraft); the old fuse part is thereafter prohibited."},"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-b717-17-brake-fuses","history":"/api/acts/ad-b717-17-brake-fuses/history","analysis":"/api/acts/ad-b717-17-brake-fuses/analysis","conflicts":"/api/acts/ad-b717-17-brake-fuses/conflicts","importantCases":"/api/acts/ad-b717-17-brake-fuses/important-cases","documents":"/api/acts/ad-b717-17-brake-fuses/documents"}}