AD/PA-34/43 Amdt 2 - Nose Gear Upper Drag Link Bolt

The directive rests on a small number of concrete engineering and procedural concepts.

• Direct mechanical replacement: Requirement 1 prescribes specific replacement hardware by Piper part number. The new bolt is Piper part number 400 274 (AN7‑35); specified washers are Piper part numbers 407 591 (AN960‑716L) and 407 568 (AN960‑716), as applicable; the nut is Piper part number 404 396 (AN320‑7); the cotter pin is Piper part number 424 085 (MS24665). The replacement is to be done “in accordance with Figure 1 of this Directive” (Requirement 1). The AD therefore standardises the physical parts to be installed at the upper drag link to nose gear trunnion interface.

• Scheduled inspection regime and corrective actions: Requirement 2 makes compliance with the content of Table 1 “Scheduled Maintenance” in Piper SB No. 1123B mandatory. The AD thus converts manufacturer recommended scheduled maintenance items into a regulatory inspection and corrective framework. Requirement 3 compels operators to perform any corrective work that flow from those inspections.

• Timing and transition from prior inspection intervals: Compliance paragraphs preserve an earlier initial inspection regime and set a transitional schedule. Compliance 1 retains the initial inspection timing established for the original AD (within 100 hours TIS after 3 March 1994 unless within last 400 hours, thereafter at intervals not exceeding 500 hours until Requirement 2 and 3 actions take effect). Compliance 2 sets the timing for this amendment (within 100 hours TIS after the effective date unless already done; thereafter at intervals specified in the SB’s Inspection Time column). Compliance 3 imposes a “before further flight” requirement after actions required by Requirement 2.

• Cross‑reference to FAA directives and approved revisions: The AD expressly allows use of “later FAA approved revision[s]” of Piper SB No. 1123B, and Figure 1 notes a relationship to FAA AD 2005‑13‑16 (which supersedes FAA AD 93‑24‑14). The AD therefore integrates international airworthiness material by reference rather than reprinting the full SB or FAA AD text.

• Safety objective grounded in service difficulty reports: The Background states the AD is “the result of service difficulty reports related to the collapse or involuntary retraction of the nose landing gear” and that failures, lack of cleanliness, or lack of lubricant “could lead to loss of control of the airplane during take‑off, landing, or taxiing operations” (Background). The AD’s technical measures are linked to those operational safety outcomes.

These concepts combine hardware standardisation, mandated inspection and corrective cycles, transitional scheduling rules, and cross‑referenced reliance on the manufacturer’s SB and FAA approvals. The principal instrument of regulatory force is the AD itself; its mechanical effect is to require specific parts and to convert a manufacturer SB Table 1 into mandatory maintenance for the applicable fleet.

The directive applies to the entire operator and maintenance ecosystem for Piper PA‑34 series aeroplanes, as stated in the Applicability clause: “Model PA‑34 series” (Applicability). Affected parties include:

• Aircraft owners and operators of model PA‑34 series aeroplanes, who are obligated to ensure their aircraft comply with the inspection and replacement requirements within the time windows specified (Requirement 1-3; Compliance 1-3). Operators are the parties that will schedule the inspections, procure parts, and accept any aircraft downtime implied by “before further flight” restrictions.

• Maintenance organisations and certificated aircraft maintenance engineers who perform the physical replacements and inspections. The AD specifies particular parts and references Figure 1 and Table 1 of the Piper Service Bulletin, so maintainers must have access to that SB and to the Figure for correct installation orientation and part usage.

• Parts suppliers and logistics chains that stock or supply the specified Piper part numbers (400 274, 407 591, 407 568, 404 396, 424 085). The AD ties compliance to those part numbers (Requirement 1), so suppliers and supply chains are implicated in lead times, stock management and quality control.

• Regulatory and oversight bodies, principally CASA as issuer and its delegates, who determine the effective date and manage enforcement, and potentially foreign authorities referenced via FAA ADs and FAA‑approved revisions of the Piper SB. The AD is signed by a CASA Delegate and gives an effective date (Delegate signature; effective date).

• Insurers and operators’ risk managers, because the AD responds to failures that the Background ties to “collapse or involuntary retraction” and “loss of control” scenarios; compliance status may factor into liability and coverage even though the AD itself does not specify penalties.

• Training providers and internal compliance teams that must update maintenance schedules and checklists to reflect the mandatory Table 1 inspections from Piper SB No. 1123B dated 20 April 2006, or later FAA‑approved revisions (Requirement 2).

The AD does not create a narrow exemption class; it applies uniformly across the Model PA‑34 series. Parties that previously complied with the initial inspection schedule within the last 400 hours TIS may rely on that record under the Compliance text (Compliance 1). The AD also permits use of later FAA‑approved revisions of the Piper SB, which affects who decides what document version governs any particular compliance action (Requirement 2).

Duties

• Replace specified components: Under Requirement 1, operators must “Replace the bolt and attached parts that connect the upper drag link to the nose gear trunnion” using the listed Piper part numbers and “in accordance with Figure 1 of this Directive.” The duty is prescriptive as to part numbers: Piper P/N 400 274 (AN7‑35) bolt; P/Ns 407 591 (AN960‑716L) and 407 568 (AN960‑716) washers, as applicable; P/N 404 396 (AN320‑7) nut; and P/N 424 085 (MS24665) cotter pin.

• Follow the SB Table 1 scheduled maintenance: Requirement 2 makes the inspections, replacements and other corrective actions in Table 1 of Piper SB No. 1123B dated 20 April 2006, or a later FAA‑approved revision, mandatory.

• Perform consequential corrective work: Requirement 3 requires operators to “Do any necessary corrective actions as a result of the actions specified in Table 1 ‘Scheduled Maintenance’ of Piper Service Bulletin No. 1123B or later FAA approved revision.” That creates a duty to follow through on findings from the mandated inspections.

• Observe timing and “before further flight” rules: The Compliance section places concrete timing obligations on when these duties must be performed, including initial inspection windows tied to historical dates and an explicit “before further flight” requirement after actions triggered by Requirement 2 (Compliance 1-3).

Rights and operational flexibilities

• Use of later FAA‑approved revisions: The AD allows the use of “later FAA approved revision[s]” of Piper SB No. 1123B (Requirement 2 and the directive’s revision update language). This gives operators and maintainers the right to rely on later FAA‑approved manufacturer guidance rather than being locked to the single dated SB.

• Applicability-based relief where prior compliance exists: Compliance 1 notes circumstances where the initial inspection requirement “remains unchanged” for aircraft that already accomplished the inspection “within the last 400 hours time in service.” That is a factual relief right where maintenance history satisfies the initial inspection timing condition.

• Deference to Figure 1 for installation: The AD requires installation “in accordance with Figure 1,” which provides a mechanical installation reference; maintainers have the right to follow this drawing rather than infer installation details from text alone.

Constraints

• The AD prescribes specific parts and does not provide an alternative parts list in the text. Any substitution would need to be consistent with Figure 1 and likely require an FAA/CASA‑approved alternative method of compliance, which is not provided in the AD text itself.

• The “before further flight” mandate constrains operations: if an inspection or corrective action under Requirement 2 identifies an issue, the aircraft cannot legally be flown until the required corrective actions are completed (Compliance 3).

Operational consequence

• These duties convert certain maintenance tasks from recommended practice to mandatory regulatory obligations with specific timing. The list of precise part numbers and the mandatory nature of Table 1 inspections focus maintenance spend and actions on the NLG upper drag link assembly and its cleanliness/lubrication status, consistent with the safety rationale cited in the Background.

The text of AD/PA‑34/43 Amdt 2 does not include an express penalty schedule or specific enforcement procedures within the document itself. The AD is issued by the Civil Aviation Safety Authority (CASA), as shown by the signature block naming “David Villiers, Delegate of the Civil Aviation Safety Authority,” and the AD contains an effective date of 28 September 2006. The instrument therefore functions as a mandatory regulatory directive from CASA, rather than a set of guidance recommendations.

What the document states

• The AD states the requirements, parts and timing that are mandatory for compliance (Requirements 1-3; Compliance 1-3). It does not specify monetary fines, suspension procedures, or administrative enforcement steps within the text provided.

• The signature by a CASA delegate and the effective date indicate that the AD is an enforceable instrument within the regulatory framework CASA administers; the AD format is that of a regulatory prescriptive measure.

Implications for enforcement

• Because the AD does not set out penalties within its text, enforcement mechanisms would be exercised through CASA’s general regulatory powers and enforcement processes rather than through provisions contained in the AD itself. The AD identifies the required actions and the deadline, leaving the administrative and enforcement machinery , inspections, audit, notices, or other CASA processes , to be applied under CASA’s broader statutory remit. The AD’s text does not describe those processes.

• The “before further flight” qualification in Compliance 3 functions as an immediate operational enforcement lever: if an action required by Requirement 2 reveals a condition, the AD prohibits flight before corrective action is completed. This creates an operational compliance requirement that affects airworthiness status.

Practical note for operators and maintainers

• Operators and certificated maintenance organisations should treat the AD as mandatory and document compliance in aircraft maintenance records. Given the absence of explicit penalty language in the document, records of compliance, parts invoices, SB references and sign‑offs will be the primary evidence in demonstrating adherence to the AD during any CASA oversight or audit activity.

• If an operator believes there is an alternative method of compliance or wishes to rely on non‑specified parts, that pathway is not described in the AD text and would generally require engagement with the regulator to obtain an approved alternative method of compliance; the AD text itself provides no such authorisation.

The AD interacts explicitly with manufacturer and foreign regulatory materials; it does not reproduce or amend other statutes within its own text. The directive’s own cross‑references and temporal sequencing create practical interfaces with maintenance programmes and with foreign issued ADs. The text identifies these concrete interactions.

Manufacturer service bulletin

• The AD mandates actions “specified in Table 1 ‘Scheduled Maintenance’ of Piper Service Bulletin No. 1123B dated 20 April 2006 or later FAA approved revision” (Requirement 2). That means the regulatory requirement incorporates a manufacturer’s document by reference. Maintenance records and compliance actions must therefore track the SB content and any later FAA‑approved revisions relied upon.

FAA airworthiness directives

• Figure 1 contains a Note: “FAA AD 2005‑13‑16 Amdt 39‑14153 which supersedes FAA AD 93‑24‑14 Amdt 39‑8762 refers.” That establishes a relationship between this CASA AD and prior FAA ADs. The AD also allows the use of “later FAA approved revision[s]” of the Piper SB (Requirement 2). The CASA AD thereby aligns its requirements with FAA approvals and with specific FAA AD history rather than creating an independent or conflicting technical requirement.

Maintenance regulation and airworthiness standards

• The AD’s prescription of parts, inspection intervals and “before further flight” constraints will intersect with operator maintenance programmes and airworthiness directives that are enforced through CASA under the applicable regulatory framework. While the AD text does not cite the enabling statute in which CASA derives enforcement powers, its format and signature by a CASA delegate indicate it is a regulatory measure that must be reflected in an aircraft’s airworthiness record and maintenance release processes.

Implications for international operators

• Because the AD references FAA approvals and allows later FAA‑approved SB revisions, operators that operate the PA‑34 under multiple jurisdictions will need to reconcile CASA’s AD, the manufacturer SB, and FAA material. The AD does not itself establish how conflicting foreign directives are to be treated, but it explicitly recognises FAA material as the technical reference point for service bulletin revisions.

No express conflicts identified in the text

• The AD’s text does not identify any direct statutory conflicts with other laws; it operates by converting manufacturer maintenance requirements and alignment with FAA ADs into mandatory actions under CASA’s AD process. Any legal interaction that would require clarification , for example, acceptance of alternative parts, or deferral of actions under other national rules , is not addressed in this document and would require formal regulatory engagement outside the AD’s text.

The directive includes a concise amendment history embedded in the document text. The key points, as stated in the AD, are:

• Original AD: The opening material states that “The original issue of this Airworthiness Directive became effective on 3 March 1994” (Background). That establishes the AD’s long‑standing lineage.

• Amendment 1: The Background records that “Amendment 1, effective 1 September 2005, introduced additional inspection requirements.” That indicates at least one prior amendment that expanded inspection obligations.

• Current amendment (Amdt 2): The instrument before the reader is labelled “AD/PA‑34/43 Amdt 2.” The Background explains the purpose of this amendment: “This amendment updates the revision status of the Piper service bulletin and allows the use of later FAA approved revisions of this service bulletin when they become available.” The document also identifies its effective date: “This Amendment becomes effective on 28 September 2006.”

• Relationship to FAA ADs: The Figure 1 Note mentions FAA AD 2005‑13‑16 which supersedes FAA AD 93‑24‑14; the AD text thereby records the chain of related FAA AD action while updating its own cross‑reference policy to accept later FAA‑approved SB revisions.

Chronology summarised from the AD text

• 3 March 1994 , original AD became effective (original issue).
• 1 September 2005 , Amendment 1 became effective (added inspection requirements).
• 28 September 2006 , AD/PA‑34/43 Amdt 2 becomes effective (this amendment), updating the SB revision status and allowing later FAA‑approved revisions.

The AD itself functions as the authoritative record for these amendment steps within the instrument. It does not provide more granular revision text for Amendment 1 or the original AD; it merely summarises the changes introduced by those earlier instruments and records the current amendment’s effect on SB revision policy.

The text of AD/PA‑34/43 Amdt 2 contains no references to judicial proceedings, appeals, administrative litigation, or case law. It sets out requirements, compliance timelines, and its effective date, but does not mention any legal challenges, stays, or disputes arising from the AD or prior amendments.

What the AD records

• The Background states the technical rationale and amendment chronology (including the original issue and Amendment 1), but does not reference any litigation or contested proceedings.

Implications for practitioners seeking litigation context

• There is no litigation history recorded in this document, so any inquiry into disputes, successful challenges to the AD, or judicial interpretations would require research beyond the text of the AD itself. The AD is an administrative regulatory instrument; absence of litigation material in the AD is not evidence that none exists, but it does mean the AD does not report or summarise any such matters.

• For compliance purposes, the absence of litigation language does not change the mandatory nature of the AD’s directives; legal challenge or litigation status is not reflected in the AD text and therefore should not be assumed to alter operational obligations set out in Requirements 1-3 and Compliance 1-3.

This AD contains several operational and interpretative pitfalls that maintenance planners and operators should note, based solely on the text.

• Exact part numbers are mandated: Requirement 1 lists discrete Piper part numbers for the bolt, washers (two different P/Ns noted “as applicable”), nut and cotter pin. Substituting alternative hardware is not authorised by the AD text. Any deviation would require an authority‑approved alternative compliance method, which the AD does not provide. The parts are: P/N 400 274 (AN7‑35) bolt; P/N 407 591 (AN960‑716L) washer; P/N 407 568 (AN960‑716) washer; P/N 404 396 (AN320‑7) nut; P/N 424 085 (MS24665) cotter pin (Requirement 1).

• “As applicable” for washers introduces judgement: Two different washer P/Ns are listed and qualified by “as applicable.” Interpreting which washer applies depends on the installation drawing in Figure 1 (Requirement 1 and Figure 1 reference). Maintain clear records or a maintenance engineer’s sign‑off that the correct washer type was used per Figure 1.

• Figure 1 is normative: The replacement is to be “in accordance with Figure 1 of this Directive” (Requirement 1). If the maintenance organisation does not have a clear, legible copy of Figure 1, or if the Figure lacks sufficient detail for a particular aircraft variant, there is no alternative installation guidance in the AD text. Ensure a working copy of Figure 1 is available during the work.

• Timing rules have multiple layers and historical dates: Compliance 1 preserves an initial inspection rule tied to 3 March 1994 and the condition “unless already accomplished within the last 400 hours TIS,” with subsequent intervals not to exceed 500 hours TIS until Requirement 2 and 3 commence. For some operators, reconciling historical maintenance records against these dated windows can be complex. Compliance 2 then imposes a fresh 100‑hour TIS window after the effective date of this amendment unless already done. Misreading which timing rule applies can lead to non‑compliance.

• “Before further flight” after Requirement 2 actions: Compliance 3 states an imperative: “Before further flight after any action is required by Requirement 2 of this Airworthiness Directive.” That means if an inspection under Table 1 reveals a condition triggering corrective work, the aircraft must not fly until that corrective work is completed. This can ground an aircraft immediately if an issue is found.

• Reliance on an external document and its revisions: Requirement 2 makes the SB’s Table 1 mandatory “or later FAA approved revision.” Operators must ensure that any later revision they rely upon is in fact FAA‑approved. The AD does not specify how to verify FAA approval; operators should retain the approval documentation as part of the compliance record.

• Record‑keeping and proof of compliance: The AD does not prescribe the specific form of compliance evidence; however, given the AD’s mandatory nature and the “before further flight” requirement, operators should document part numbers installed, SB revision used, inspection dates, TIS at inspection, and sign‑offs to demonstrate compliance. The AD text provides the normative requirements but not the record form.

• Corrective actions undefined in text: Requirement 3 directs the performance of “any necessary corrective actions” resulting from the SB Table 1 work, but does not list what those corrective actions might be. This delegates technical judgement to the maintenance organisation within the bounds of the SB. Maintain access to competent engineering resources to determine required corrective work in line with the SB.

• Cross‑reference to FAA ADs without full text: Figure 1’s note refers to FAA AD 2005‑13‑16 and its supersession of FAA AD 93‑24‑14. The CASA AD does not reproduce the FAA ADs. If an operator requires the FAA AD text for technical detail, they must obtain it separately. The CASA AD’s acceptance of later FAA‑approved SB revisions may affect which technical instructions apply.

Below is a practical, source‑grounded stepwise compliance checklist derived directly from the AD text. Each step cites the relevant requirement or compliance paragraph in the AD.

1. Confirm applicability

   • Verify the aircraft is a Piper PA‑34 series model (Applicability). If so, the AD applies.

2. Review maintenance history

   • Check maintenance logs for any record of prior inspections or replacements of the NLG upper drag link bolt assembly. Compliance 1 provides a historical initial inspection window: if the initial inspection was accomplished within the last 400 hours TIS relative to the 3 March 1994 schedule, that specific initial inspection obligation may be considered satisfied under the AD’s transitional rule (Compliance 1).

3. Schedule the initial inspection/replacement

   • If the inspection/replacement has not already been performed in accordance with the AD’s timing rules, schedule the work “within 100 hours time in service (TIS) after” the relevant date:
     • For the original regime, within 100 hours TIS after 3 March 1994 unless done within the previous 400 hours TIS (Compliance 1).
     • For this amendment, within 100 hours TIS after the effective date of the amendment (28 September 2006) unless already done, and thereafter follow the SB Inspection Time column (Compliance 2).
   • Note the AD’s effective date: “This Amendment becomes effective on 28 September 2006.”

4. Obtain required documents and parts

   • Obtain Piper Service Bulletin No. 1123B dated 20 April 2006 and verify whether a later FAA‑approved revision exists and is intended to be used, since Requirement 2 allows a later FAA‑approved revision.
   • Obtain Figure 1 from the AD and ensure it is available to the maintenance team for use “in accordance with Figure 1” (Requirement 1).
   • Procure the specified parts: Piper P/N 400 274 (AN7‑35) bolt; P/N 407 591 (AN960‑716L) washer as applicable; P/N 407 568 (AN960‑716) washer as applicable; P/N 404 396 (AN320‑7) nut; and P/N 424 085 (MS24665) cotter pin (Requirement 1).

5. Execute mechanical replacement

   • Replace the bolt and attached parts connecting the upper drag link to the nose gear trunnion using the specified parts and following the orientation and detail in Figure 1 (Requirement 1).

6. Perform the scheduled maintenance in Table 1

   • Carry out all inspections, replacements and other corrective actions specified in Table 1 “Scheduled Maintenance” of Piper SB No. 1123B dated 20 April 2006, or of a later FAA‑approved revision (Requirement 2).
   • Record the inspection interval used (the SB’s Inspection Time column will determine recurrent intervals after the initial action; Compliance 2).

7. Implement corrective actions arising from inspections

   • If Table 1 inspections identify issues, do any necessary corrective actions as a result (Requirement 3). Remember: Compliance 3 states these actions must be completed “before further flight.”

8. Apply “before further flight” constraint

   • If an inspection or work item triggered by Requirement 2 identifies a condition requiring corrective work, do not permit the aircraft to fly until those corrective actions are completed (Compliance 3).

9. Maintain records

   • Document the AD number (AD/PA‑34/43 Amdt 2), the part numbers installed, the reference to Piper SB No. 1123B and any FAA‑approved revision used, the dates and TIS at inspection, and the signature and licence number of the certificated person performing/approving the work. Although the AD does not mandate a specific log format, maintain comprehensive records because the AD is mandatory and is an airworthiness action.

10. Plan recurring maintenance

    • After the initial actions are complete, schedule subsequent inspections at intervals referenced in the SB’s Inspection Time column (Compliance 2). Note that an earlier regime (500 hours TIS) applied under the original AD until the SB‑driven interval actions commenced (Compliance 1).

11. If you need an alternative

    • The AD does not provide an alternative method of compliance in text. If an operator seeks to use different parts, procedures or intervals, they must obtain regulatory approval outside the AD text. The AD allows use of a later FAA‑approved SB revision, but does not authorise other deviations.

12. Verify FAA approvals when relying on later revisions

    • If relying on a later revision of Piper SB No. 1123B, ensure it is FAA‑approved and retain evidence of that approval together with the compliance entry.

13. Coordinate with regulator if unclear

    • If any of the AD’s instructions are unclear in their application to a particular aircraft variant or configuration (for example, which washer P/N is “applicable”), seek clarification from CASA or the authorised delegate, recognising that the AD itself does not define an internal dispute or alternative compliance process.

This checklist follows the AD’s express text: Replacement hardware and installation per Figure 1 (Requirement 1); Table 1 inspections and corrective work per Piper SB No. 1123B or later FAA‑approved revision (Requirement 2 and 3); and the compliance timing rules and “before further flight” limitation (Compliance 1-3). Keep documentary evidence of the SB revision used and the FAA approval status when relying on later SB revisions.