{"id":"F2022L00556","name":"AD/CESSNA 150/31 Amdt 5 Vertical Fin Attach Brackets, Nutplates and Fittings","slug":"ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":102388,"registerId":"commonwealth-F2022L00556-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Textron Aviation (Cessna) 150, F150, 152","sectionType":"part","heading":"Textron Aviation (Cessna) 150, F150, 152 & F152 Series Aeroplanes","content":"# Textron Aviation (Cessna) 150, F150, 152 & F152 Series Aeroplanes\n\n| AD/CESSNA 150/31 Amdt 5 | Vertical Fin Attach Brackets,Nutplates and Fittings | 7/2022 |\n| ----------------------- | --------------------------------------------------- | ------ |\n\n| Applicability: | Textron Aviation (formerly Cessna/Reims) aircraft models listed below:Models 150F, 150G, 150H, 150J, 150K, 150L and 150M with serial numbers 15061533 through 15079405;Models A150K, A150L and A150M, with serial numbers A1500001 through A1500734;Model 152 aircraft, with serial numbers 15279406 through 15284541;Model A152 aircraft, with serial numbers A1520735 through A1520943;Models F150F, F150G, F150H and F150J, with serial numbers F150-0001 through F150-0529;Models F150K, F150L and F150M, with serial numbers F15000530 through F15001428;Models FA150K and FA150L, with serial Numbers FA1500001 through FA1500120;Model F152 aircraft with serial numbers F15201429 through F15201828;Model FA152 aircraft with serial numbers FA1520337 through FA1520372;Model FRA150L and FRA150M aircraft, with serial numbers FRA1500121 through FRA1500336. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect the attach bracket and nutplates using the method detailed in Cessna SIL No. SE 79-49 Revision 1, or Reims Aviation Service Bulletin No. 24 Revision 1, both as in force on the commencement date of this AD, as applicable.2. a. Remove paint from both base radii on each of the port and starboard rear attach fittings;b. Visually check the radius area, inspecting for cracking and/or corrosion. If there are indications of either condition the brackets must be replaced;c. Re-protect the subject area with an approved protective treatment.Note 1: United States of America Federal Aviation Administration (FAA) AD 80‑11‑04 is the basis for this AD. European Aviation Safety Agency (EASA) AD 2006-0267 also refers.                                                                                                                        |\n\n|             | Note 2: The inspection requirements of this Directive are not required if the part number NAS 1068A4 nutplates are replaced with AN365-428, MS20365-428, MS21042L4, or MS21044N4 nuts.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | For FRA150L and FRA150M aircraft, inspect within 100 hours’ time in service after 26 October 2006, and thereafter at intervals not exceeding 100 hours’ time in service until the affected nutplates are replaced (See Requirement Note 2).For all other aircraft, inspect within 100 hours’ time in service after31 November 1984, and thereafter at intervals not exceeding 100 hours’ time in service until the affected nutplates are replaced (See Requirement Note 2). The compliance time for these aircraft is unchanged.                                                                                                                                                                                                           |\n|             | This AD commences on 11 April 2022.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |\n| Background: | Cracked vertical fin attachment nutplates have been found on in-service aircraft. Undetected cracking could result in structural failure and consequent separation of the vertical or vertical and horizontal tail assembly from the aircraft.Amendment 3 corrected aircraft applicability so as to only include aircraft fitted with the fabricated attach bracket.Amendment 4 was issued to introduce optional terminating action to the inspection requirements of this Directive, as specified in EASA AD 2006-0267 and FAA AD 80-11-04; and to include Models FRA150L and FRA150M aircraft.Amendment 5 is issued to exclude pre 1966 aircraft from the AD effectivity to align with Cessna SIL SE79-49 Revision 1 and FAA AD 80-11-04. |\n\n![Signature of Delegate](image.001.jpeg)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n1 April 2022","sortOrder":0},{"sectionNumber":"AD/CESSNA 150/31 Amdt 5","sectionType":"part","heading":"AD/CESSNA 150/31 Amdt 5","content":"## AD/CESSNA 150/31 Amdt 5","sortOrder":1},{"sectionNumber":"Vertical Fin Attach Brackets,Nutplates a","sectionType":"part","heading":"Vertical Fin Attach Brackets,Nutplates and Fittings","content":"## Vertical Fin Attach Brackets,  \nNutplates and Fittings","sortOrder":2},{"sectionNumber":"7/2022","sectionType":"part","heading":"7/2022","content":"## 7/2022","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":4,"scope_assessment":{"changed":true,"description":"The legislation has narrowed from its original scope. Amendment 5 specifically excludes pre-1966 aircraft to align with updated manufacturer guidance (Cessna SIL SE79-49 Revision 1) and the US FAA directive. Earlier amendments had expanded the scope — Amendment 4 added FRA150L and FRA150M models, while Amendment 3 had previously refined applicability to only include aircraft with fabricated attach brackets. The current version represents a refinement rather than expansion, removing older aircraft that were inadvertently captured in earlier versions."},"complexity_factors":["Extensive applicability table with 12 distinct aircraft models and specific serial number ranges spanning multiple decades of manufacture","Multiple reference documents required (Cessna SIL SE 79-49 Rev 1, Reims SB No. 24 Rev 1, FAA AD 80-11-04, EASA AD 2006-0267)","Two different compliance schedules based on aircraft model (FRA150L/M vs all others) with different start dates (2006 vs 1984)","Conditional terminating action (Note 2) allowing cessation of inspections upon specific part replacement","Amendment history references (Amendments 3, 4, and 5) explaining scope changes but not fully restated in operative text","Technical aviation terminology requiring specialised knowledge (nutplates, attach brackets, base radii, protective treatments, 'time in service')"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the vertical-tail attachment brackets and nutplates on certain Cessna/ Reims-built 150/152-series airplanes (roughly post‑1966 serials) because corrosion or cracking could allow the tail to separate in flight. Owners/operators must de‑paint, inspect, repair and re‑protect affected fittings at intervals (every 100 flight hours) until the vulnerable NAS 1068A4 nutplates are replaced with specified approved alternatives, which terminates the repetitive inspections."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The directive's scope has been adjusted across amendments: Amendment 3 narrowed applicability to aircraft fitted with the fabricated attach bracket; Amendment 4 added an optional terminating action (replacement of certain nutplates) and included FRA150L/FRA150M models; Amendment 5 excluded pre‑1966 aircraft to align with Cessna SIL SE79‑49 Rev 1 and FAA AD 80‑11‑04. These changes shift who must perform recurring inspections and introduce a parts‑replacement path to end the inspection obligation."},"complexity_factors":["Detailed applicability by multiple models and narrow serial‑number ranges increases identification work for operators.","Inspection procedure depends on external documents (Cessna SIL SE 79‑49 Rev 1 or Reims Service Bulletin No. 24 Rev 1) creating cross‑document compliance.","Optional terminating action (replacement of NAS 1068A4 nutplates with listed part numbers) changes ongoing inspection obligations, requiring parts sourcing and fitting.","Different compliance start dates/intervals for FRA150L/FRA150M versus other aircraft add scheduling complexity.","Workscope requires paint removal, visual inspection for cracking/corrosion, part replacement and re‑protection — practical maintenance effort and parts cost borne by operators.","References to FAA and EASA ADs and prior amendments mean historical changes affect current applicability and may require record checks.","Exclusion of pre‑1966 aircraft and prior amendments to applicability mean operators must verify airframe history to determine effect."],"plain_english_summary":"Requires owners/operators of specified Cessna 150/152 series aircraft (listed by model and serial number ranges) to inspect rear vertical‑fin attach brackets and nutplates for cracking or corrosion, remove paint to inspect the base radii, replace defective brackets, and re‑protect the area. Inspections must follow the Cessna or Reims service instructions cited. Inspections recur every 100 flight hours until NAS 1068A4 nutplates are replaced by approved alternatives (an optional terminating action). Costs and compliance fall to aircraft owners/operators to prevent possible tail separation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings","history":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings/history","analysis":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings/analysis","conflicts":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings/conflicts","importantCases":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings/important-cases","documents":"/api/acts/ad-cessna-150-31-amdt-5-vertical-fin-attach-brackets-nutplates-and-fittings/documents"}}