{"id":"F2007L01338","name":"AD/BR700/9 - Fan Disc Retirement Lives","slug":"ad-br700-9-fan-disc-retirement-lives","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65563,"registerId":"commonwealth-F2007L01338-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Germany Turbine Engines - BR","sectionType":"division","heading":"Rolls Royce Germany Turbine Engines - BR700 Series","content":"### Rolls Royce Germany Turbine Engines - BR700 Series\n\n| AD/BR700/9 | Fan Disc Retirement Lives | 7/2007 TX |\n| ---------- | ------------------------- | --------- |\n\n| Applicability: | Rolls-Royce Deutschland Ltd & Co KG BR700-715A1-30, BR700-715B1-30 and BR700-715C1-30 engines.Note 1: These engines are known to be installed on, but not limited to Boeing 717 aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Amend the Time Limits Manual (TLM) SUBTASK 05-10-01-860-016 by revising the “GIVEN LIFE A1-30 RATING (FLIGHT CYCLES)” for both the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH10048 and BR715 LP Compressor (Fan) Disc Assembly Part No. BRH19253 from 33000 flight cycles to 25000 flight cycles.2. Amend any other Reference, where the maximum approved life is quoted for the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH10048 or the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH19253, when installed in the BR700-715A1-30 engine model and operated under the Hawaiian Flight Mission, to the revised maximum approved life of 25000 flight cycles.3. Check the Life Limited Parts (LLP) Tracking Sheet for both the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH10048 and BR715 LP Compressor (Fan) Disc Assembly Part No. BRH19253 if the relevant BR715 LP Compressor (Fan) Disc Assembly is currently or has previously been installed in the BR700-715A1-30 engine model and operated under the Hawaiian Flight Mission. Refer to Time Limits Manual (TLM) TASK 05-00-01-800-001 for Recording and Control of the lives of parts.a. If NO, no further action in accordance with this AD is required.b. If YES, up-date all pro rata calculations and complete the LLP Tracking Sheet of the relevant BR715 LP Compressor (Fan) Disc Assembly for both the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH10048 and BR715 LP Compressor (Fan) Disc Assembly Part No. BRH19253, using the revised Hawaiian Flight Mission maximum approved life of 25000 flight cycles and check if their consumed life has exceeded the maximum approved life of the Flight Mission currently installed. |\n\n|             | (i) If NO, no further actions in accordance with this AD are required.(ii) If YES, reject the relevant BR715 LP Compressor (Fan) Disc Assembly.Note 2: EASA Emergency AD 2007-0116-E dated 4 May 2007 refers.                                                                                                                                                                                                                                                                                                                                                                     |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | No later than 100 flight cycles after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n|             | This Airworthiness Directive becomes effective on 11 May 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background: | The most recent 3D FEM modelling has resulted in the need to reconsider the disc lives as currently show in the Time Limits Manual. The current Post Certification Life Statement for the Low Pressure (LP) Compressor (Fan) Disc Assembly revises the Declared Safe Cyclic Life (DSCL) from 33000 flight cycles to 25000 flight cycles for both the BR715 LP Compressor (Fan) Disc Assembly Part No. BRH10048 and BR715 LP Compressor (Fan) Disc Assembly Part No. BRH19253, when installed in the BR700-715A1-30 engine model and operated against the Hawaiian Flight Mission. |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n8 May 2007","sortOrder":0},{"sectionNumber":"AD/BR700/9","sectionType":"part","heading":"AD/BR700/9","content":"## AD/BR700/9","sortOrder":1},{"sectionNumber":"Fan Disc Retirement Lives","sectionType":"part","heading":"Fan Disc Retirement Lives","content":"## Fan Disc Retirement Lives","sortOrder":2},{"sectionNumber":"7/2007 TX","sectionType":"part","heading":"7/2007 TX","content":"## 7/2007 TX","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It targets a specific safety-critical component (fan disc assemblies) in specific engine models under specific operational conditions. The legislation has not expanded beyond its original purpose of addressing the revised life limits based on updated engineering analysis."},"complexity_factors":["Multiple specific part numbers and engine models requiring precise identification (BR700-715A1-30, BRH10048, BRH19253)","Conditional logic with nested if/then requirements (Note 3a/3b and sub-points i/ii)","Cross-references to external technical documents (Time Limits Manual SUBTASK 05-10-01-860-016 and TASK 05-00-01-800-001)","Specific operational context dependency ('Hawaiian Flight Mission' flight profile)","Technical aviation terminology throughout (LLP, DSCL, FEM, flight cycles, pro rata calculations)","Dual effective dates (effective date of AD vs compliance deadline of 100 flight cycles)"],"plain_english_summary":"This AD mandates reducing the life limit of Rolls‑Royce BR700‑715A1‑30 fan discs (parts BRH10048, BRH19253) from 33,000 to 25,000 flight cycles when used on the high‑stress \"Hawaiian Flight Mission.\" It affects operators (e.g., Boeing 717 fleets) and maintenance organisations.\n\nOperators must update manuals, check records for Hawaiian‑mission usage, recalculate life remaining, and remove any disc over 25,000 cycles. The change follows 3D FEM modelling showing accelerated wear; compliance is required within 100 flight cycles after 11 May 2007."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD is a targeted safety update that narrows the approved life for two fan-disc part numbers in a single engine model and for a single operational flight mission. It does not broaden the regulatory regime beyond its original safety-management purpose: it tightens an existing life-limit provision rather than adding new regulatory subjects, authorities, or compliance pathways. The action remains constrained to the named parts, engine model (BR700-715A1-30), and the Hawaiian Flight Mission profile; operators outside that combination see no material scope expansion beyond the new life limit where relevant."},"complexity_factors":["Single, narrowly focused substantive change (reduction of life limit for two part numbers)","Conditional logic limited to one condition: whether the part has been or is installed in BR700-715A1-30 engines operated under the Hawaiian Flight Mission (if NO, no further action; if YES, update calculations and possibly reject)","Two specific part numbers affected (BRH10048 and BRH19253)","Cross-reference requirements: update TLM subtask and any other references quoting the maximum approved life","Reference to external documents: Time Limits Manual (TLM) TASK and LLP Tracking Sheet procedures, plus EASA Emergency AD cross-reference","Short compliance window (100 flight cycles) increases procedural urgency but not legal complexity","Low number of defined terms and limited nested exceptions"],"plain_english_summary":"**What this directive changes (mechanical steps)\n\n- Changes the officially allowed service life for two specific fan (LP compressor) disc assemblies — Part No. BRH10048 and BRH19253 — when they are installed in the BR700-715A1-30 engine and operated under the \"Hawaiian Flight Mission\" profile: the maximum life is reduced from 33,000 flight cycles to 25,000 flight cycles. (Requirement 1)\n- Requires operators to amend their Time Limits Manual (TLM) and any other documents that quote the maximum approved life to show the new 25,000 flight-cycle limit for the affected parts under the Hawaiian mission. (Requirement 1–2)\n- Requires operators to check their Life Limited Parts (LLP) Tracking Sheet to see whether either disc has ever been or is currently installed in a BR700-715A1-30 engine that has been operated under the Hawaiian mission. If so, operators must re-run pro rata life calculations using the 25,000-cycle limit and determine whether the consumed life already exceeds the revised limit. If a disc has exceeded the revised limit it must be rejected (i.e. removed from service). If it has not, the updated records remain. (Requirement 3(a)–(b) and sub-steps (i)/(ii))\n- Compliance deadline: these checks and changes must be done no later than 100 flight cycles after the directive takes effect. (Compliance)\n\nWhy the change was issued (stated reason)\n\n- The stated technical reason is that updated 3D finite-element modelling (FEM) and the engine’s Post Certification Life Statement for the LP (fan) disc showed the Declared Safe Cyclic Life (DSCL) for these two part numbers, when used in the BR700-715A1-30 engine under the Hawaiian mission, should be 25,000 cycles rather than the previously listed 33,000 cycles (Background). The AD cross-refers to an EASA Emergency AD that supports the action. (Note 2)\n\nWho this affects and who pays\n\n- Directly affected: operators of BR700-715A1-30 engines that have run (or will run) the Hawaiian Flight Mission. The AD notes these engine models are known to be installed on, but not limited to, Boeing 717 aircraft (Applicability / Note 1).\n- Responsibilities fall to the aircraft/engine operator and their maintenance organisation: they must amend manuals and tracking records, recalculate prorated remaining lives, and remove any discs that have exceeded the reduced life. Those actions impose administrative costs and possible replacement costs on the operator.\n- The regulator (Civil Aviation Safety Authority delegate, via this AD) is the decision-maker issuing the requirement; it is mandatory for affected operators. (Signature/Delegate)\n\nPractical effects, incentives and trade-offs\n\n- Safety mechanism: the rule tightens the retirement life for a specific safety-critical rotating part in a specific engine-model/mission combination. The mechanical effect is earlier mandatory retirement of the two listed disc part numbers when used under the Hawaiian mission.\n- Cost and operational impact: operators running the Hawaiian mission will either have to retire and replace discs earlier than previously planned (raising parts and shop-hours costs and possibly causing aircraft downtime) or demonstrate by the LLP check that installed discs still fall within the new limit. Operators not operating the engine under the Hawaiian mission, or who have never had those discs installed under that mission, need only perform the records check and typically will have no further action. The requirement to update manuals and records is an administrative cost for all affected operators.\n- Market and supply effects: tighter retirement limits concentrate costs on the subset of operators using this engine/mission profile. If many engines need earlier disc replacement there is a risk of temporary higher demand for replacement discs and associated services; the AD itself does not provide mitigation or supply relief.\n- Compliance risk and implementation: the AD has a short compliance window (100 flight cycles), so operators must quickly identify affected engines/parts in their records and update calculations. Errors in tracking or delay could lead to an inadvertent overrun of the new limit and require part rejection at short notice.\n\nScope and limits of the measure\n\n- The change is specific to two part numbers, a single engine model (BR700-715A1-30) and a single operational flight mission (Hawaiian Flight Mission). It does not change the life limits for those parts in other engine models or under other mission profiles unless those references are explicitly amended elsewhere. If a disc has not been used in the BR700-715A1-30 under the Hawaiian mission, no new maintenance action is required beyond the records check. (Requirement 1–3)\n\nNotes and cross-references\n\n- The AD cites EASA Emergency AD 2007-0116-E — it is part of the technical justification. (Note 2)\n- Effective / compliance timing: this AD became effective 11 May 2007 and requires action within 100 flight cycles of that effective date (Compliance).\n\nBalance of incentives and opportunity costs (analyst's framing)\n\n- Who bears costs: aircraft/engine operators and their maintenance providers bear the direct costs (administration, earlier replacement, potential downtime). The regulatory act imposes a firm, short timeline to act, creating implementation pressure (opportunity cost of diverting maintenance resources). There is no direct transfer of costs to producers or an offset mechanism in the text.\n- Behavioural effects: operators may change maintenance scheduling, stokepiling of spare discs, or adjust routing/mission planning to reduce exposure (if commercially feasible). The AD does not provide exemptions or alternative compliance routes beyond record checks and part rejection where limits are exceeded.\n\nBottom line (mechanical summary): Amend manuals and records to reduce the certified retirement life of BRH10048 and BRH19253 fan discs from 33,000 to 25,000 flight cycles for BR700-715A1-30 engines operating the Hawaiian Flight Mission; check tracking sheets and reject any discs already beyond 25,000 cycles; complete these steps within 100 flight cycles of the AD taking effect."},"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-br700-9-fan-disc-retirement-lives","history":"/api/acts/ad-br700-9-fan-disc-retirement-lives/history","analysis":"/api/acts/ad-br700-9-fan-disc-retirement-lives/analysis","conflicts":"/api/acts/ad-br700-9-fan-disc-retirement-lives/conflicts","importantCases":"/api/acts/ad-br700-9-fan-disc-retirement-lives/important-cases","documents":"/api/acts/ad-br700-9-fan-disc-retirement-lives/documents"}}