{"id":"F2007L01597","name":"AD/F100/84 - Fuel Crossfeed Valve and Fire Shut-Off Actuators","slug":"ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66165,"registerId":"commonwealth-F2007L01597-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Fokker F28 Series Aeroplanes","sectionType":"division","heading":"Fokker F28 Series Aeroplanes","content":"### Fokker F28 Series Aeroplanes\n\n| AD/F100/84 | Fuel Crossfeed Valve andFire Shut-Off Actuators | 7/2007 |\n| ---------- | ----------------------------------------------- | ------ |\n\n| Applicability: | F28 Mark 0070 and Mark 0100 aircraft, serial numbers 11244 through 11585 inclusive, if equipped with fuel crossfeed valve- and fuel fire shut-off valve actuators, Part Number (P/N) 9409122. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | 1. Perform an operational check of, and application of grease on, the LH and RH fuel crossfeed valve actuators and fuel fire shut off valve actuators as defined in Part 1 of SBF-100-28-049 or later NAA approved revision.2. a. Perform a visual inspection of the applied grease layer on the LH and RH fuel crossfeed valve actuators and fuel fire shut off valve actuators as defined in Part 2 of SBF-100-28-049 or later NAA approved revision; andb. Perform an operational check and visual inspection of the LH and RH fuel crossfeed valve actuators and fuel fire shut off valve actuators as defined in Part 3 of SBF-100-28-049 or later NAA approved revision.3. When, during any of the inspections as required by Requirement 2a of this AD, the layer of grease on any valve actuator is found to be insufficient (less than approx. 2 - 3 mm), repeat the application of grease as defined in Part 1 ofSBF-100-28-049 or later NAA approved revision.4. When a fuel fire shut-off valve actuator fails the operational check as required by Requirements 1 or 2b of this AD, replace the valve actuator with a serviceable part in accordance with the Aircraft Maintenance Manual.5. When a fuel crossfeed valve actuator fails the operational check as required by Requirements 1 or 2b of this AD, replace the valve actuator with a serviceable part in accordance with the Aircraft Maintenance Manual or operate the aircraft in accordance with (the conditions and remarks in) MMEL item 28-23-1.Note: EASA AD 2007-0122 dated 3 May 2007 refers. |\n| Compliance: | 1. Within 30 days after the effective date of this AD, unless previously accomplished. |\n\n| | 2. After compliance with paragraph 1 of this directive:a. At intervals not to exceed 7 days.b. At intervals not to exceed 28 days.3. Before further flight after the effective date of this AD.4. Before further flight after the effective date of this AD.5. Before further flight after the effective date of this AD. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 5 July 2007. |\n| Background: | In-service experience revealed that, due to their position on the aircraft, ice may form on actuators P/N 9409122 installed on fuel crossfeed valves and fuel fire shut-off valves. Tests revealed that the ice can prevent the actuator and thus the valve from operating in flight (frozen stuck). A new actuator is being developed by Fokker Services; However, an airworthiness assessment revealed that interim actions are required for actuators P/N 9409122 installed on fuel crossfeed valves and fuel fire shut-off valves until the new actuators are installed. Fokker Services has issued SB SBF100-28-049 to introduce interim actions that will reduce the probability that fuel crossfeed and fuel fire shut-off valves equipped with actuators P/N 9409122 do not operate due to ice. The interim actions consist of an operational check of the actuators and the application of a grease layer on the actuators, followed by a weekly visual check of the applied grease layer and a 4-weekly operational check of the actuators. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n14 May 2007","sortOrder":0},{"sectionNumber":"AD/F100/84","sectionType":"part","heading":"AD/F100/84","content":"## AD/F100/84","sortOrder":1},{"sectionNumber":"Fuel Crossfeed Valve andFire Shut-Off Ac","sectionType":"part","heading":"Fuel Crossfeed Valve andFire Shut-Off Actuators","content":"## Fuel Crossfeed Valve and \nFire Shut-Off Actuators","sortOrder":2},{"sectionNumber":"7/2007","sectionType":"part","heading":"7/2007","content":"## 7/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"Scope remains focused on interim mitigation for actuators P/N 9409122 on specified F28 marks/serials; the directive prescribes maintenance checks and grease application until the new actuator is introduced, without expanding affected types or functions (Applicability; Requirement; Background)."},"complexity_factors":["Technical specificity: applicability limited to F28 Mark 0070/0100, serial numbers 11244–11585, and actuator Part Number 9409122 (Applicability).","Procedural steps: multiple distinct maintenance actions (grease application, operational checks, visual inspection, re-application thresholds) with measured grease depth guidance (Requirements 1–3).","Conditional actions and alternatives: failed actuator replacement or operation under MMEL item 28-23-1 for crossfeed actuators; replacement mandatory for fire shut-off actuators (Requirements 4–5).","Compliance scheduling: immediate 30-day window, then mixed periodicities (7-day and 28-day intervals) and 'before further flight' triggers (Compliance).","External-document dependence: references to Fokker Service Bulletin SBF-100-28-049 (NAA-approved revisions), Aircraft Maintenance Manual, and EASA AD 2007-0122 (Requirements, Background, Note).","Interim nature and implementation risk: measures are temporary pending a redesigned actuator, creating ongoing operational and tracking burdens (Background).","Safety-critical context: actions affect systems (fuel crossfeed and fire shut-off valves) whose failure has high operational significance (Background)."],"plain_english_summary":"**Requires operators of Fokker F28 Mark 0070 and 0100 aircraft (serials 11244–11585) fitted with actuators P/N 9409122 to apply grease and perform operational checks on LH/RH fuel crossfeed and fuel fire shut-off valve actuators.** It mandates weekly visual checks of the grease layer, four-weekly operational tests, and replacement or MMEL-limited operation for failed actuators, citing Fokker SB SBF-100-28-049 and the Aircraft Maintenance Manual to address actuator icing risk that can freeze valve operation."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing ice formation on specific fuel valve actuators in specific Fokker F28 aircraft. The requirements remain tightly focused on the identified safety issue without expansion into unrelated systems or operational areas."},"complexity_factors":["Short, single-purpose directive with clear sequential requirements","Only 5 numbered requirements with straightforward conditional logic (if-then)","Limited applicability: specific aircraft models, serial number range, and single part number","References external technical documents (SBF-100-28-049, Aircraft Maintenance Manual, MMEL item 28-23-1) without reproducing their content","Simple compliance timeline: initial 30-day window, then recurring 7-day and 28-day intervals","No nested definitions, interpretation sections, or extensive cross-referencing within the instrument itself"],"plain_english_summary":"This CASA Airworthiness Directive targets certain Fokker F28 Mark 0070/0100 aircraft fitted with fuel valve actuators P/N 9409122. It mandates regular operational checks, application and monitoring of protective grease, and replacement (or MMEL-compliant restrictions) if an actuator fails.\n\nThe AD addresses actuator icing that can immobilize fuel crossfeed and fire shut-off valves—risking fuel management and fire response—as an interim safety measure until redesigned actuators are available."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators","history":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators/history","analysis":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators/analysis","conflicts":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators/conflicts","importantCases":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators/important-cases","documents":"/api/acts/ad-f100-84-fuel-crossfeed-valve-and-fire-shut-off-actuators/documents"}}