{"id":"F2008L01455","name":"AD/CESSNA 337/30 - Pitot Tube Installation","slug":"ad-cessna-337-30-pitot-tube-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119751,"registerId":"commonwealth-F2008L01455-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 337 Series Aeroplanes","sectionType":"division","heading":"Cessna 337 Series Aeroplanes","content":"### Cessna 337 Series Aeroplanes\n\n| AD/CESSNA 337/30 | Pitot Tube Installation | 6/2008 |\n| ---------------- | ----------------------- | ------ |\n\n```html\n

Applicability:

Model 337 series aircraft modified in accordance with United States Federal Aviation Administration (FAA) Supplemental Type Certificate (STC) SA1627WE with the following serial numbers:

337-0058 337-0063 337-0124 337-0205 337-0220 337-0291 337-0305 337-0327 337-0332 337-0443 337-0502 337-0540

337-0549 337-0566 337-0577 337-0685 337-0695 337-0726 337-0728 337-0732 337-0741 337-0817 337-0822 337-0836

337-0880, 337-0882, 337-0896 337-0916 337-0925 337-0929 337-0938 337-0942 337-0946 337-0947 337-0959 337-0963

337-0970 337-0977 337-0992 337-0996 337-1019 337-1036 337-1044 337-1052 337-1062 337-1072 337-1073 337-1079

337-1082 337-1091 337-1108 337-1118 337-1124 337-1139 337-1154 337-1159 337-1162 337-1175 337-1177 337-1180

337-1192 337-1210 337-1232 337-1258 337-1262 337-1274 337-1276 337-1303 337-1307

Note 1: STC SA1627WE which was originally held Robertson Aircraft Corporation, 839 West Perimeter Rd, Renton, WA, the STC is now held by Sierra Industries Ltd, 122 Howard Langford Dr, Uvalde, TX.

Requirement:

If not previously accomplished, rework the extended pitot tube by installation of Robertson Kit No. 14-118-100 in accordance with Robertson modification instructions No 14-118-10 dated 23 January 1975.

Note 2: The requirements of this Directive may have been accomplished prior to the aircraft’s arrival in Australia and the aircraft’s maintenance records may indicate compliance with FAA AD 75-09-05, this is considered acceptable for compliance with this Directive.

Note 3: FAA AD 75-09-05 Amdt 39-2177 refers.

Compliance:

Within 100 hours time in service after the effective date of this Directive.

This Airworthiness Directive becomes effective on 5 June 2008.

\n```\n\n| Background: | This Directive follows an internal review of Australian Airworthiness Directives (AD) which indicated an Australian AD was not issued in response to FAA AD75-09-05, as there were no aircraft in the affected serial number range in Australia at that time. The FAA AD was originally to prevent the possibility of unreliable airspeed indications due to ice formation in the pitot system. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Whilst CASA acknowledges that there have been no incidents of a similar nature reported in Australia and that only one of the affected aeroplanes is currently on the Australian register, CASA is required to publish State of design ADs which may affect Australian aircraft. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n21 April 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 337/30","sectionType":"part","heading":"AD/CESSNA 337/30","content":"## AD/CESSNA 337/30","sortOrder":1},{"sectionNumber":"Pitot Tube Installation","sectionType":"part","heading":"Pitot Tube Installation","content":"## Pitot Tube Installation","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD precisely matches its original purpose: mandating a specific hardware modification to address a known icing hazard in a limited fleet. The scope has not expanded beyond the original FAA safety concern from 1975."},"complexity_factors":["Single, specific technical requirement with no conditional exceptions or nested logic","Only 3 short notes providing alternative compliance pathways","Limited applicability: 67 specific serial numbers explicitly listed, no interpretive discretion required","No defined terms section — all terminology is standard aviation maintenance language","Straightforward compliance deadline: single timeframe (100 hours time in service)","No cross-references to other Australian legislation — only references to external FAA documents for background context"],"plain_english_summary":"This AD mandates installation of Robertson Kit No. 14-118-100 on specific Cessna 337s modified under STC SA1627WE to prevent pitot-tube icing that can produce false airspeed. It applies to 67 listed serial-numbered aircraft (one registered in Australia).\n\nOwners must install the kit within 100 flight hours after 5 June 2008 unless already done (FAA AD 75-09-05 compliance counts). CASA adopted the action to mitigate fatal risks from blocked pitot systems."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive adopts the FAA technical corrective action for the same pitot-icing risk and applies it to a defined set of serial-numbered aircraft. It does not expand the FAA’s technical scope; CASA issued the AD to capture aircraft of Australian interest and to require the specified pitot rework within a set compliance period."},"complexity_factors":["Narrow applicability: only aircraft with specific serial numbers modified under STC SA1627WE are affected (Applicability).","Single technical action: one mandated modification (install Robertson Kit No. 14-118-100 per Robertson instructions) reduces regulatory complexity.","Clear, short compliance window: work required within 100 hours time-in-service after the AD’s effective date (Compliance).","Acceptable prior compliance: records showing FAA AD 75-09-05 compliance are accepted, adding a record-review step for some operators (Note 2).","Administrative details: STC holder change identified and cross-reference to FAA AD noted (Notes 1 and 3), requiring attention to lineage of approvals."],"plain_english_summary":"This Airworthiness Directive mandates that owners/operators of specific Cessna 337 aircraft modified under FAA STC SA1627WE must rework the extended pitot tube by installing Robertson Kit No. 14-118-100 following Robertson modification instructions (Requirement). It aims to address the risk of unreliable airspeed from pitot icing by imposing a hardware modification. Owners pay for parts and labour and must complete the work within 100 hours’ time-in-service (Compliance); the CASA delegate made the requirement mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-337-30-pitot-tube-installation","history":"/api/acts/ad-cessna-337-30-pitot-tube-installation/history","analysis":"/api/acts/ad-cessna-337-30-pitot-tube-installation/analysis","conflicts":"/api/acts/ad-cessna-337-30-pitot-tube-installation/conflicts","importantCases":"/api/acts/ad-cessna-337-30-pitot-tube-installation/important-cases","documents":"/api/acts/ad-cessna-337-30-pitot-tube-installation/documents"}}