AD/PR/7 - Operating Cylinder - Replacement

The text confines affected parties to aircraft or propeller owners and operators that have the Dowty Rotol variable pitch propeller models listed in Dowty Rotol SB No. 61-564 and which have not incorporated Mod. No. (c) VP 2422 as recorded in SB 61-540. The schedule entry uses the precise formulation "All models detailed in SB No. 61-564 not incorporating Mod. No. (c) VP 2422 (SB 61-540)." That identifies a two-part test for application: first, the propeller must be among the models enumerated by the cited Dowty Rotol service bulletin; second, it must lack the indicated modification. The entry does not expand the class of affected persons beyond those who possess or operate such propellers, nor does it specify whether owners, operators, maintenance organisations, or certificated engineers carry primary legal responsibility. The schedule entry does not state exemptions, transitional arrangements, or authority delegation. The inclusion of the compliance date, "Before 1 January 1970," makes the obligation time-bound; parties matching the applicability criteria at any date prior to that deadline would, under the directive as printed, have been required to complete the replacement by that date. The schedule entry does not set out downstream impacts such as grounding, airworthiness certificate implications, or continuing airworthiness monitoring; it identifies the mechanical remedy, the models to which it applies, and the absolute date by which action must be completed.

The schedule entry creates an affirmative duty to effect the replacement of the operating cylinder on the affected Dowty Rotol variable pitch propellers. The duty is framed by reference to Dowty Rotol SB No. 61-564, which is the technical document named in the entry. The schedule text instructs that the replacement must be carried out in respect of "All models detailed in SB No. 61-564 not incorporating Mod. No. (c) VP 2422 (SB 61-540)" and that compliance must occur "Before 1 January 1970." The directive therefore imposes three elements of obligation: to determine applicability by checking whether the propeller model is listed in SB No. 61-564; to confirm whether Mod. No. (c) VP 2422 has been incorporated (if it has been incorporated, the directive does not apply); and to complete the physical replacement of the operating cylinder pursuant to the Dowty Rotol SB and the associated modification numbering (including Mod. No. (c) VP 2480 as referenced in the schedule). The schedule entry does not, within its text, delineate express statutory rights such as rights to review, appeal, or to seek deferral; it does not specify administrative processes for seeking an alternative method of compliance, nor does it specify any required evidence of compliance or record-keeping. The directive does not state whether compliance under the named service bulletin constitutes the exclusive method for meeting the duty, nor does it identify any limitations on who may perform the replacement. Those procedural and rights-related matters are not recorded in the schedule entry provided.

The schedule entry lists the airworthiness directive and its operative terms but does not specify penalties, sanctioning processes, or enforcement mechanisms within the text provided. The entry appears under the heading identifying the Civil Aviation Safety Authority and the Civil Aviation Regulations 1998, Part 39-107, which locates the directive within the broader regulatory framework, but the schedule text itself contains no express penalty provisions, no notice requirements, and no administrative steps for enforcement. The schedule entry therefore sets out the technical obligation and compliance deadline while leaving unspecified, within the printed item, how non-compliance would be treated under the Act or Regulations. The presence of the directive in the Schedule of Airworthiness Directives implies it is an instrument of regulatory force, but the precise sanctions or remedial powers, notification processes, or administrative enforcement steps are not set out in this schedule entry. The entry also does not document whether evidence of compliance must be lodged with the Civil Aviation Safety Authority, whether non-compliance would affect airworthiness certification, or whether discretion exists to grant extensions or alternatives. Those matters are not stated in the supplied text.

Within the supplied text the principal cross-reference is to the Civil Aviation Regulations 1998 framework: the entry is placed under "COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES." That situates AD/PR/7 inside the statutory schedule related to civil aviation safety. The directive also cross-references Dowty Rotol technical materials: SB No. 61-564 is the primary referenced service bulletin, while SB No. 61-540 is referenced for Mod. No. (c) VP 2422, and Mod. No. (c) VP 2480 is parenthetically listed next to the SB citation. The schedule entry therefore interacts with three document types: the Commonwealth civil aviation regulatory schedule, the manufacturer service bulletin that prescribes the technical remedy, and a separate service bulletin that records whether a specific modification (VP 2422) has been incorporated. The text does not reference other Commonwealth statutes, state legislation, international conventions, or separate regulatory parts beyond the Part 39-107 heading. The entry does not specify whether compliance with the Dowty Rotol SB satisfies any additional regulatory requirements, nor does it identify conflicts or priorities between the service bulletin and other maintenance standards. The schedule entry does not include language about supersession of earlier directives or interaction with continuing airworthiness programmes outside these explicit cross-references.

The supplied schedule entry does not include an amendment history. There is no recorded date of issue other than the compliance deadline "Before 1 January 1970," and no notation of prior versions, revocations, or subsequent changes in the text presented. The entry gives specific cross-references to manufacturer modification numbers and service bulletins, including Mod. No. (c) VP 2480, but the document does not state whether the AD supersedes prior directives or whether it has itself been amended at any later date. The presence of a fixed compliance date may indicate the time of issuance preceded that date, but the schedule entry does not show an enactment or publication date, an authorising instrument reference beyond the Part 39-107 heading, or any footnote recording amendments. Because the supplied text is silent on amendment history, no claim about subsequent changes, ongoing validity, withdrawal, or replacement can be made from the material provided.

The supplied schedule entry contains no litigation history. It does not list judicial decisions, appeals, administrative reviews, or any court or tribunal determinations that interpret, challenge, or enforce AD/PR/7. The text does not cite cases, nor does it include references to disputes arising from the directive. No procedural history before the Civil Aviation Safety Authority is provided. Therefore the document itself contains no material on enforcement proceedings, contested compliance, or judicial interpretation. Any litigation history, if it exists, is not recorded in the supplied text and cannot be inferred from it.

The schedule entry contains several technical and procedural features that require careful attention because the text itself supplies only a brief directive. First, applicability is determined by cross-reference to the manufacturer service bulletin, SB No. 61-564. That means the precise set of affected models is not listed in the schedule; parties must check SB No. 61-564 to identify which model designations the directive covers. Second, the directive exempts units that have incorporated Mod. No. (c) VP 2422 as recorded in SB No. 61-540. The entry therefore requires maintainers to determine modification status against a separate SB; failure to verify incorporation could lead to unnecessary or duplicate work. Third, the schedule entry identifies a compliance deadline "Before 1 January 1970." This absolute past date is part of the printed directive; the entry does not indicate whether later administrative action was taken to update or reissue the requirement, nor does it state the consequence of non-compliance after that date. Fourth, the AD references "Mod. No. (c) VP 2480" in parentheses beside the Dowty Rotol SB citation. The schedule entry does not explain the relationship between that modification number and the operative replacement action, so readers must consult the named SB for technical clarification. Fifth, the entry inserts the mark "NK" after the AD identifier; the schedule does not define "NK" within the provided text. Finally, the directive does not contain operational details about who may carry out the replacement, record-keeping obligations, or proof of compliance. Those procedural and technical gaps create a risk that parties relying solely on the schedule entry may not have sufficient information and must consult the named Dowty Rotol service bulletins to determine exact steps, parts, and authorisations.

Compliance, as stated in the schedule entry, requires three concrete actions grounded in the directive text. First, determine applicability by checking whether the propeller is among "All models detailed in SB No. 61-564." The schedule entry does not reproduce the model list, so a copy of Dowty Rotol SB No. 61-564 must be obtained and consulted. Second, confirm modification status: if "Mod. No. (c) VP 2422 (SB 61-540)" has been incorporated, the directive does not apply; if VP 2422 has not been incorporated, the unit falls within the AD. That requires inspection of modification records and, if necessary, consultation of SB No. 61-540. Third, effect the replacement of the Operating Cylinder in accordance with the technical instructions contained in Dowty Rotol SB No. 61-564, and observe any further modification numbering cited, including Mod. No. (c) VP 2480 indicated in the entry. The schedule entry mandates completion "Before 1 January 1970." The entry itself does not specify who may perform the work, what certification is required for the work, or what paperwork to file to evidence compliance. Therefore practitioners should follow the technical procedures in the named SB, retain documentation of model identification and modification status, and keep records of the replacement work. The schedule entry does not set out administrative reporting steps; compliance in practice will require consulting the Civil Aviation Safety Authority's broader regulatory framework and the Dowty Rotol service bulletins to confirm any record submission or approval processes that are not reproduced in the schedule item.