{"id":"F2008L01242","name":"AD/CESSNA 400/114 - Fuel Flow Transducer","slug":"ad-cessna-400-114-fuel-flow-transducer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73480,"registerId":"commonwealth-F2008L01242-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 400 Series Aeroplanes","sectionType":"division","heading":"Cessna 400 Series Aeroplanes","content":"### Cessna 400 Series Aeroplanes\n\n| AD/CESSNA 400/114 | Fuel Flow Transducer | 5/2008 |\n| ----------------- | -------------------- | ------ |\n\n```html\n

Applicability:

Cessna Model 400 series aeroplanes with the following serial numbers:

Model

Serial Number

402C
404
414

421C

0259, 0263, 0275, 0283 and 0288
0612, 0620, 0623 and 0628
0457, 0458, 0463, 0464, 0466, 0469, 0470, 0472, 0475, 0476, 0482, 0483, 0486, 0487, 0490, 0495 and 0497
0823 through 0866, 0869 and 0870

Requirement:

1. Inspect fuel flow transducer Cessna part number (P/N) 9910395-9 (Aerosonics Corp P/N 33184-2) on each engine to determine the serial number.

2. If the P/N 9910395-9 transducer has a serial number included in the block 2364 through 2930, replace the transducer with a transducer whose serial number is not included in that block.

Note 1: The requirements of this Directive were most likely accomplished prior to the aircraft’s arrival in Australia and the aircraft’s maintenance records would indicate compliance with FAA AD 80-13-14, this is considered acceptable for compliance with this Directive.

Note 2: FAA AD 80-13-14 Amdt 39-3844 refers.

Compliance:

For Requirement 1 - At the next scheduled maintenance but no later than 8 May 2009.

For Requirement 2 - Before further flight after the Requirement 1 inspection.

This Airworthiness Directive becomes effective on 8 May 2008.

Background:

This Directive follows an internal review of Australian Airworthiness Directives (AD) which indicated an Australian AD was not issued in response to FAA AD
80-13-14. The FAA AD was originally issued to detect and replace possible defective fuel flow transducers which may cause fuel leaks in the engine compartment.

\n```\n\n| | Whilst CASA acknowledges that there have been no incidents of a similar nature reported in Australia and that only two of the affected aeroplanes are currently on the Australian register, CASA is required to publish State of design ADs which may affect Australian aircraft. Consequently, given the time since the FAA AD was made and the limited number of affected serial numbers of affected aircraft in Australia, the compliance in this Directive is extended from that in the FAA AD of ‘Before further flight’ to ‘At the next scheduled maintenance but no later than 8 May 2009’. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n6 March 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 400/114","sectionType":"part","heading":"AD/CESSNA 400/114","content":"## AD/CESSNA 400/114","sortOrder":1},{"sectionNumber":"Fuel Flow Transducer","sectionType":"part","heading":"Fuel Flow Transducer","content":"## Fuel Flow Transducer","sortOrder":2},{"sectionNumber":"5/2008","sectionType":"part","heading":"5/2008","content":"## 5/2008","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive implementing a foreign (FAA) safety directive for a specific aircraft component. The scope remains tightly focused on the original safety issue — defective fuel flow transducers — with no expansion beyond the original FAA AD 80-13-14. The only modification is a relaxed compliance timeframe appropriate to Australian operational circumstances."},"complexity_factors":["Single, clearly defined applicability table with specific aircraft models and serial numbers","Two straightforward sequential requirements (inspect, then replace if necessary)","Only one defined part number (P/N 9910395-9) and one serial number range to check","Simple compliance timeline with two clear deadlines","No nested exceptions, conditional clauses, or cross-references to other legislation beyond a single reference to the originating FAA directive","Total length is approximately one page"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of specific Cessna 400‑series twins (models 402C, 404, 414, 421C with listed serial numbers) to inspect engine fuel flow transducers for serial numbers 2364–2930 and replace any affected units. \n\nThe transducers can leak fuel in the engine compartment, posing a fire hazard. Most affected aircraft likely already complied with FAA AD 80‑13‑14; inspection must be done by next scheduled maintenance (no later than 8 May 2009)."},"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":2,"scope_assessment":{"changed":false,"description":"This Australian directive implements the safety action embodied in FAA AD 80-13-14 for the specified transducers. CASA did not broaden the substantive scope (it still requires inspection and conditional replacement of the same transducer serials). CASA did modify the compliance timing by extending the inspection deadline to the next scheduled maintenance (but no later than 8 May 2009) instead of the FAA's original 'before further flight' timing; that is a timing adjustment, not an expansion of scope."},"complexity_factors":["Short document (two discrete requirements plus applicability and compliance timing)","Single defined hardware item (fuel flow transducer P/N 9910395-9 / Aerosonics P/N 33184-2)","One serial-number range triggers replacement (2364–2930) — simple conditional logic","Applicability lists specific aircraft models and serial numbers (limited list, not extensive cross-references)","Two explanatory notes referencing FAA AD 80-13-14 but no nested exceptions or multiple compliance pathways"],"plain_english_summary":"**What this directive does (mechanically):**\n\n- It requires owners/operators of specific Cessna 400‑series aeroplanes to check the serial number on each engine's fuel flow transducer (Cessna P/N 9910395-9; Aerosonics P/N 33184-2) and to replace any transducer whose serial number falls in the block 2364–2930.\n\n- The action is two steps: 1) inspect each transducer to record its serial number (\"Requirement 1\"); 2) if the serial number is within 2364–2930, replace that transducer with one that is not in that serial-number block (\"Requirement 2\").\n\n- Timing: the inspection must be done at the next scheduled maintenance but no later than 8 May 2009; any transducer that must be replaced must be replaced before the aeroplane next flies after the inspection.\n\n- CASA accepts evidence that the same work was already done under FAA AD 80-13-14 as fulfilling this directive.\n\n**Who this affects:**\n\n- Owners and operators of the listed Cessna 400‑series aeroplanes (the AD gives specific models and serial numbers of aircraft on which the transducers could be fitted). The AD notes only two affected aeroplanes were on the Australian register at the time, so the set of affected operators is small and concentrated.\n\n- Maintenance organisations and certificated engineers who perform the inspection and any replacement work.\n\n**Why it matters (stated purpose and practical effect):**\n\n- The FAA originally issued the corresponding directive to identify and replace potentially defective fuel flow transducers that may leak fuel in the engine compartment. CASA follows that safety concern by requiring inspection and replacement where needed.\n\n- Practically, the directive is intended to reduce the risk of fuel leaks from the specified transducer parts. The rule imposes a one‑time inspection obligation and a conditional replacement obligation where a suspect serial number is found.\n\n**Who pays, who decides, and behaviour changes:**\n\n- Aircraft owners/operators pay for inspection time and for replacement parts and labour if a transducer within the suspect serial range is found.\n\n- Operators/maintenance providers decide when during scheduled maintenance to perform the inspection (must be by the specified due date) and must remove/replace any suspect transducer before next flight.\n\n- The Civil Aviation Safety Authority (CASA) issues the directive and accepts compliance evidence from the FAA AD as valid.\n\n**Costs, incentives and implementation points to note:**\n\n- Cost concentration: costs fall mainly on the relatively small set of affected aeroplane owners; fleet‑wide costs are negligible.\n\n- Compliance burden: low if records already show prior compliance under FAA AD 80‑13‑14; otherwise the burden is an inspection (low labour time) and potential part replacement (cost and downtime if a replacement is required and spares are not immediately available).\n\n- Supply and scheduling risk: if replacements are needed, availability of the non‑suspect transducer and scheduling for mechanic time could cause aircraft downtime.\n\n- Record‑keeping: accurate identification of part and serial numbers is necessary to determine whether replacement is required; CASA explicitly accepts prior FAA compliance records as evidence.\n\n- Trade‑offs: CASA extended the inspection deadline relative to the FAA (to allow inspection at next scheduled maintenance but no later than 8 May 2009) because there were few affected aircraft in Australia and no reported incidents. That reduces immediate disruption for operators but delays removal of suspect parts compared with the FAA timing.\n\n(References in the directive: \"Requirement 1\" and \"Requirement 2\" describe the inspection and conditional replacement; the \"Compliance\" paragraph sets the timing; the \"Background\" paragraph explains connection to FAA AD 80‑13‑14.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-114-fuel-flow-transducer","history":"/api/acts/ad-cessna-400-114-fuel-flow-transducer/history","analysis":"/api/acts/ad-cessna-400-114-fuel-flow-transducer/analysis","conflicts":"/api/acts/ad-cessna-400-114-fuel-flow-transducer/conflicts","importantCases":"/api/acts/ad-cessna-400-114-fuel-flow-transducer/important-cases","documents":"/api/acts/ad-cessna-400-114-fuel-flow-transducer/documents"}}