{"id":"F2006B10847","name":"AD/INST/43 - Parker Hannifin Flexible Coupling","slug":"ad-inst-43-parker-hannifin-flexible-coupling","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56338,"registerId":"commonwealth-F2006B10847-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/43 - Parker Hannifin Flexible Coupling","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)  \nInstruments and Automatic Pilots\n\nAD/INST/43 Parker Hannifin Flexible Coupling 1/99 DM\n\nApplicability: All aircraft that have had an Airborne Dry Air Pump (Vacuum Pump) incorporating a flexible coupling, Part Number (P/N) B1-19-1, installed since 1 January 1998.\n\nNote: Review of documentation to determine applicability may be performed by any person nominated by the CofR holder with access to appropriate records.\n\nAirborne has advised the following Dry Air Pumps, Conversion Kits and Coupling Kits are affected:\n\n| Item           | Part Number | Serial Number                                                       |\n| -------------- | ----------- | ------------------------------------------------------------------- |\n| Dry Air Pump   | 211CC       | 2AP1 through 10AP319                                                |\n| Dry Air Pump   | 211CC-9     | 1AP1 through 2AP5                                                   |\n| Dry Air Pump   | E211CC      | 11AN543 through 11AN642 & 2AP1 through 7AP442                       |\n| Dry Air Pump   | 212CW       | 2AP1 through 7AP286                                                 |\n| Dry Air Pump   | E212CW      | 1AP1 through 7AP492                                                 |\n| Dry Air Pump   | 215CC       | 12AN719 through 12AN940 & 1AP1 through 9AP3510                      |\n| Dry Air Pump   | 215CC-9     | 2AP1 through 7AP95                                                  |\n| Dry Air Pump   | 216CW       | 12AN521 through 12AN660 & 1AP1through 10AP2695                      |\n| Conversion Kit | 300-1       | 4AP120 through 4AP122 & 8AP256 through 8AP258                       |\n| Conversion Kit | 300-2       | 2AP30 through 2AP43, 4AP134, 4AP136 and4AP137                       |\n| Conversion Kit | 300-3       | 1AP1 through 1AP3                                                   |\n| Coupling Kit   | 350         | 1AP through 9AP and any kits with N/A marked in the Serial No Block |\n\nWhere the P/N of the flexible coupling fitted to an affected pump is not known, assume the flexible coupling is affected by this Directive.\n\nRequirement: 1. Remove the dry air pump and inspect for discrepant flexible coupling, P/N B1-19- 1, in accordance with Airborne Service Letter No. 48, dated 20 October 1998.\n\nReplace any discrepant couplings identified during this inspection with flexible coupling, P/N B1-7-3.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nNote 1: Copies of SL48 are available from your local District Office or direct from Airborne, Fax No. 0015 1 440 937 5409 or E-mail: [airborne.tech@Parker-H.com](mailto:airborne.tech@Parker-H.com)\n\nNote 2: FAA Priority Letter AD 98-23-01 refers.\n\n2. No person shall install on an Australian registered aircraft, a Dry Air Pump fitted with a flexible coupling, P/N B1-19-1, having a date code indicating a manufacture date of either 12/97 or 5-6/98.\n\nCompliance: 1. a. Aircraft approved for Day VFR operations only: No later than next maintenance release issue.\n\n    b. Aircraft approved for IFR or Night VFR operations:\n\nWithin 5 calendar days of the effective date of this Directive or prior to further flight whichever occurs later.\n\nWhere the inspection identifies a discrepant flexible coupling is installed and spares are not available, it is permissible to operate the aircraft in accordance with Day VFR requirements until a serviceable flexible coupling is available or until the issue of the next maintenance release, whichever occurs first.\n\nIf an aircraft is to be operated under this provision, make an appropriate entry on the maintenance release and affix a placard annotated thus “DAY VFR OPERATIONS ONLY” in view of the pilot in command. The maintenance release entry can be closed and the placard removed upon fitment of a serviceable flexible coupling.\n\n    2. As of the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 4 December 1998.\n\nBackground: The FAA has received 50 reports of failures of the flexible coupling on certain Parker Hannifin Airborne Dry Pumps, Conversion Kits and Coupling Kits that have been installed in aircraft or engines.\n\nThese failures have been attributed to a manufacturing defect of the B1-19-1 flexible coupling manufactured between 1 January 1998 and 13 October 1998. This condition could result in loss of primary attitude and direction references during Instrument Flight Rules (IFR) operations.","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":5,"scope_assessment":{"changed":false,"description":"The directive applies to pumps and kits with the listed part numbers/serial ranges installed since 1 January 1998 and bans installing couplings with specified date codes. The text shows no alteration to that scope; it enlarges practical applicability via the presumption rule when P/N is unknown but does not indicate a change from the instrument's stated coverage."},"complexity_factors":["Large list of affected items: multiple pump models, conversion kits and coupling kits with many serial-number ranges to check.","Presumption rule: if the flexible coupling P/N is unknown, the coupling must be treated as affected (broadens applicability).","Action requires physical removal and inspection, not just paperwork review, with replacement to a specified P/N (B1-7-3) where discrepant coupling found.","Compliance timing differs by operation type (Day VFR vs IFR/Night VFR) and includes an operational allowance to continue Day VFR if spares unavailable, contingent on maintenance entries and placarding.","References an external Airborne Service Letter (SL48) for inspection procedure and an FAA Priority Letter AD, creating dependency on external documents for full implementation.","Record-review flexibility: review may be performed by any person nominated by the CofR holder with access to records, introducing delegation discretion and variation in practice.","Prohibition on installing certain date-coded couplings as of the effective date imposes an immediate supply/install constraint on operators and maintenance providers.","Effective date and maintenance-release requirements create short compliance windows and administrative burden for operators and maintenance organisations."],"plain_english_summary":"Requires removal and inspection of certain Parker Hannifin Airborne dry air pumps for a potentially defective flexible coupling (P/N B1-19-1), replacement with P/N B1-7-3 where needed, and bans installing units with that coupling if manufactured in date codes 12/97 or 5–6/98. Affects Australian-registered aircraft with those pumps installed since 1 January 1998; the directive responds to reported coupling failures that can cause loss of primary attitude/directional references during IFR and forces operators to inspect, document restrictions, and, if necessary, limit operations to Day VFR until repaired."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with focused, targeted scope. It addresses a specific manufacturing defect in a specific component from a specific time period. The scope remains tightly constrained to the identified safety risk without expansion into broader operational or maintenance requirements."},"complexity_factors":["Multiple applicability criteria requiring cross-referencing of part numbers, serial numbers, and installation dates","Nested conditional compliance deadlines based on aircraft operational approval type (Day VFR vs IFR/Night VFR)","Exception to the exception: Special provision allowing continued Day VFR operation when discrepant coupling found but spares unavailable, with specific placarding and documentation requirements","Assumption rule: \"Where the P/N... is not known, assume... affected\" creates a default presumption requiring interpretation","External document references (Airborne Service Letter No. 48, FAA Priority Letter AD 98-23-01) that are not reproduced in full","Date code interpretation requirement for prohibition on installation (manufacture dates 12/97 or 5-6/98)","Dual regulatory framework: issued under Civil Aviation Regulations 1998, Part 39, but implementing foreign (FAA) safety intelligence"],"plain_english_summary":"This AD mandates removal and inspection of certain Parker Airborne Dry Air Pumps (and replacement of a defective flexible coupling P/N B1-19-1 with P/N B1-7-3) on Australian-registered aircraft that had the pumps installed since 1 Jan 1998. It affects operators who fly in instrument or night conditions because coupling failure can cause loss of primary flight instruments.\n\nUrgent compliance times apply for IFR/Night VFR; Day VFR may be allowed temporarily with a “DAY VFR OPERATIONS ONLY” placard if no replacement is available."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling","history":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling/history","analysis":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling/analysis","conflicts":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling/conflicts","importantCases":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling/important-cases","documents":"/api/acts/ad-inst-43-parker-hannifin-flexible-coupling/documents"}}