{"id":"F2006B06286","name":"AD/PMC/31 - Propeller Blade Actuating Pin Installation - Inspection","slug":"ad-pmc-31-propeller-blade-actuating-pin-installation-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47351,"registerId":"commonwealth-F2006B06286-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PMC/31 - Propeller Blade Actuating Pin Installation - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPropellers \\- Variable Pitch \\- McCauley\n\nAD/PMC/31 Propeller Blade Actuating Pin Installation - Inspection\n\n  \n11/76\n\n| Applicability: | Propeller Model | Series No | Propeller Model | Serial No |\n| -------------- | --------------- | --------- | --------------- | --------- |\n|                | D2A34C49( )     | 692417    | 2A34C66( )      | 727628    |\n|                | D2A34C49( )     | 703405    | 2A34C66( )      | 732194    |\n|                | D2A34C50( )     | 64746     | E2A34C73( )     | 720673    |\n|                | D2A34C50( )     | 690329    | E2A34C73( )     | 721615    |\n|                | D2A34C58( )     | 721610    | E2A34C73( )     | 732503    |\n|                | OR              | 734269    | 2A36C23( )      | 64358     |\n|                | F2A34C58( )     | 736436    | 2A36C23( )      | 66786     |\n|                |                 |           | D2A36C33( )     | 61005     |\n|                |                 |           | D2A36C33( )     | 611491    |\n\nNote: The Sixteen propellers listed by specific S/No. are the only ones affected by this Airworthiness Directive.\n\nRequirement: The above referenced propellers may have blade ferrules with incorrectly drilled (shallow) actuating pin holes. Dismantle the propeller and inspect to ensure that the correct pins are installed in the blade ferrules, and that the blade actuating pin holes in the ferrules are drilled and tapped to the depth listed in McCauley Service Manual 720415.\n\nRepair or replace as necessary, any improperly installed blade actuating pins, washers, or blade ferrules, and re-assemble the propeller in accordance with McCauley Service Manual 720415, or later applicable issue. Note that the shallow actuating pin hole modification listed in McCauley SB No. 99 is not applicable to the above propeller models.\n\nor FAA AD 76-19-04.\n\nCompliance: Within 100 hours time in service after 30 November 1976.","sortOrder":0}],"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":3,"scope_assessment":{"changed":false,"description":"Scope remains restricted to the sixteen serial‑numbered propellers listed. The Directive requires inspection and corrective maintenance per McCauley Service Manual 720415 and does not expand applicability beyond those units."},"complexity_factors":["Very limited applicability — only sixteen propellers identified by serial number","Requires dismantling the propeller for physical inspection (technical labour and certified maintenance)","Specification of hole depths is delegated to McCauley Service Manual 720415 (external technical reference)","Potential need for repair or replacement of pins, washers or ferrules (parts, labour, possible downtime)","Short compliance window (100 flight hours) increases scheduling pressure","Cross-reference to FAA AD 76‑19‑04 and exclusion of SB No.99 add interpretive steps for maintainers"],"plain_english_summary":"This Directive requires owners/operators of sixteen listed McCauley variable‑pitch propellers to dismantle and inspect blade ferrules and actuating pin installations, and to repair or replace pins, washers or ferrules so pin holes meet depths in McCauley Service Manual 720415.\n\nStated purpose is to correct shallow pin holes that may impair blade actuation; compliance, within 100 flight hours after 30 Nov 1976, imposes inspection/repair costs on operators and requires maintenance to follow the McCauley manual or FAA AD 76‑19‑04. SB No.99 does not apply."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in 16 identified propellers. There is no indication of scope creep; the document maintains its original narrow purpose of mandating inspection and repair for this specific airworthiness issue."},"complexity_factors":["Very narrow applicability — only 16 specific serial numbers affected, making the scope extremely limited","Single, clear mechanical requirement (inspect, repair/replace, reassemble) with explicit reference to manufacturer manual","One straightforward compliance deadline (100 hours time in service after fixed date)","Minimal defined terms — only standard aviation terminology (\"time in service\", \"blade ferrule\") used without elaborate definitions","No nested exceptions or conditional logic — the 'Note' clarifies an exclusion (SB 99 not applicable) but this is a simple negative statement, not a complex exception structure","Short document — approximately 200 words excluding tables","Single cross-reference to FAA AD 76-19-04 as alternative compliance path, but this is presented as a simple 'or' option without elaboration"],"plain_english_summary":"This AD mandates urgent dismantling and inspection of 16 specific McCauley variable-pitch propellers for a potential manufacturing defect: blade ferrule actuating pin holes drilled too shallow. Owners/operators must verify pin type and hole depth per McCauley Service Manual 720415, repair or replace any faulty pins, washers or ferrules, and reassemble to manual standards.\n\nIt affects only those 16 serial-numbered propellers, must be done within 100 flight hours after 30 Nov 1976, and is critical to prevent in‑flight propeller failure (McCauley SB99 does not apply)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection","history":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection/history","analysis":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection/analysis","conflicts":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection/conflicts","importantCases":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection/important-cases","documents":"/api/acts/ad-pmc-31-propeller-blade-actuating-pin-installation-inspection/documents"}}