{"id":"F2007L01726","name":"AD/CESSNA 500/29 - Wing Fuel Boost Pump Wiring","slug":"ad-cessna-500-29-wing-fuel-boost-pump-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66440,"registerId":"commonwealth-F2007L01726-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 500 (Citation) Series Aeroplanes","sectionType":"division","heading":"Cessna 500 (Citation) Series Aeroplanes","content":"### Cessna 500 (Citation) Series Aeroplanes\n\n| AD/CESSNA 500/29 | Wing Fuel Boost Pump Wiring | 8/2007 TX |\n| ---------------- | --------------------------- | --------- |\n\n```html\n

Applicability:

Cessna Model 500 and 501 model aeroplanes with serial numbers 001 through 0689 inclusive.

Requirement:

1. If not previously accomplished, revise the Limitations Section of the applicable Cessna aircraft flight manual (AFM) to prohibit use of the wing fuel boost pumps for defueling under certain conditions, by inserting the applicable temporary change identified in the following table.

AFM Temporary Change

500FM TC-R57-01
500FM TC-R57-02
500FM TC-R57-03

Dated

5 April 2004
5 April 2004
5 April 2004

AFM

Cessna Model 500
Cessna Model 500
Cessna Model 500

2. If not previously accomplished, install a placard close to the fuel quantity gauge, in accordance with the Accomplishment Instructions of the Cessna Service Bulletin SB500-28-12 dated 14 June 2004. In addition to the specifications in the service bulletin, the letters on the placard must be at least 6mm (1/4 inch) tall.

3. If not previously accomplished, carry out the following actions in accordance with the Accomplishment Instructions of SB500-28-12:

a. Do a detailed inspection for chafed wiring of the wing fuel boost pumps.

b. Modify the wing fuel boost pumps.

Note 1: For the purposes of this Directive, a detailed inspection is: \"An intensive examination of a specific item, installation or assembly to detect damage, failure or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.''

Note 2: Actions required by this Directive may have been previously accomplished in accordance with FAA AD 2006-06-03.

\n```\n\n| | 4. If as a result of the Requirement 3.a. inspection any discrepancies are detected, accomplish all applicable corrective and other specified actions in accordance with the service bulletin. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | 5. Remove the Requirement 1 AFM temporary change and the Requirement 2 placard. |\n| | Later revisions of the above SB(s), approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2006-05-08, are considered acceptable for compliance with the equivalent Requirements of this Directive. |\n| | Note 3: FAA AD 2006-06-03 Amdt 39-14511 refers. |\n| Compliance: | For Requirements 1 and 2 - Within 25 hours time in service (TIS) after the effective date of this Directive. |\n| | For Requirement 3 - Within 300 hours TIS after the effective date of this Directive. |\n| | For Requirement 4 - Before further flight, immediately following the Requirement 3.a. inspection. |\n| | For Requirement 5 - Before further flight after the Requirement 3 inspection and modification are accomplished. |\n| | This Airworthiness Directive becomes effective on 15 June 2007. |\n| Background: | This Directive requires the revision of the AFM to initially prohibit use of the wing fuel boost pumps for defueling under certain conditions and the installation of a placard. The Directive subsequently requires the accomplishment of other specified investigative and corrective actions as necessary. Terminating action for this Directive is the modification of the wing boost pumps together with the removal of the AFM revision and placard. |\n| | The FAA has received a report of a chafed electrical wiring harness, which was arcing inside the fuel tank. This Directive is issued to prevent potential fuel vapour ignition in a fuel tank, which could result in explosion and loss of the aeroplane. |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n8 June 2007","sortOrder":0},{"sectionNumber":"AD/CESSNA 500/29","sectionType":"part","heading":"AD/CESSNA 500/29","content":"## AD/CESSNA 500/29","sortOrder":1},{"sectionNumber":"Wing Fuel Boost Pump Wiring","sectionType":"part","heading":"Wing Fuel Boost Pump Wiring","content":"## Wing Fuel Boost Pump Wiring","sortOrder":2},{"sectionNumber":"8/2007 TX","sectionType":"part","heading":"8/2007 TX","content":"## 8/2007 TX","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive implements specific mitigations for a reported wiring arcing hazard and aligns with FAA AD 2006‑06‑03. It limits actions to the stated Cessna Model 500/501 serial range (001–0689), mandates temporary operational limits until modification, and accepts FAA‑approved SB revisions as alternate methods of compliance. It does not expand the applicability beyond the listed serial numbers or introduce ongoing restrictions once the modification and removal of the AFM change/placard are completed."},"complexity_factors":["Technical detailed inspection requirement for chafed wiring (requires enhanced lighting and aids per Note 1)","Physical modification of wing fuel boost pumps per SB500‑28‑12 (hardware/maintenance work)","Multiple staged compliance windows and urgencies (Requirements 1&2 within 25 hours TIS; Requirement 3 within 300 hours TIS; Requirement 4 and 5 before further flight)","Conditional corrective actions that must be accomplished immediately if discrepancies found (Requirement 4)","Reliance on external documents and approvals: Cessna SB500‑28‑12 and FAA AD 2006‑06‑03; later SB revisions accepted only if FAA‑approved as AMOC","Operational restriction (AFM temporary change) plus required placard with specified lettering size (minimum 6 mm) creates both procedural and small equipment/label costs"],"plain_english_summary":"This Directive orders owners/operators of Cessna Model 500/501 aeroplanes (serials 001–0689) to revise the flight manual to restrict use of the wing fuel boost pumps for defueling, fit a fuel‑gauge placard, inspect wiring for chafing, and modify the wing boost pumps per Cessna Service Bulletin SB500‑28‑12. Some actions must be done within 25 hours TIS and others within 300 hours TIS; the temporary AFM change and placard are removed after the modification is completed.\n\nThe measures fall on aircraft owners/operators and maintenance organisations, who must carry out inspections, corrective work and the modification to address an FAA‑reported arcing wiring hazard and reduce the risk of fuel‑vapour ignition."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring defect in specific Cessna aircraft models. The reference to FAA AD 2006-06-03 as an acceptable alternative compliance method does not expand the scope; it merely provides flexibility for operators who may have already completed the work under the American directive."},"complexity_factors":["Straightforward sequential requirements (1-5) with clear dependencies","Only 2 defined terms provided in notes ('detailed inspection' and reference to FAA AD)","Simple conditional logic: 'If not previously accomplished' appears 3 times","Single cross-reference to FAA AD 2006-06-03 and Cessna Service Bulletin SB500-28-12","Clear compliance deadlines tied to flight hours (TIS = Time In Service)","No nested exceptions or complex definitional sections","Background section clearly explains the safety rationale"],"plain_english_summary":"This CASA Airworthiness Directive applies to Cessna 500/501 jets (S/N 001–0689) and targets a critical fire/explosion risk from wing fuel boost pump wiring chafing inside the fuel tanks. \n\nIt mandates short-term operational restrictions and a warning placard, followed by prompt detailed inspection and modification/repair of the pump wiring (with repairs required before further flight); temporary measures are removed after the fix."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring","history":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring/history","analysis":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring/analysis","conflicts":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring/conflicts","importantCases":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring/important-cases","documents":"/api/acts/ad-cessna-500-29-wing-fuel-boost-pump-wiring/documents"}}