AD/DAUPHIN/96 - CPI 503 Crash Position Indicator Components

The Airworthiness Directive creates a legally binding maintenance standard that overrides ordinary scheduled maintenance intervals for affected helicopters. Several distinct concepts anchor its operation.

Affected CPI 503 beacon components. The AD does not apply to all CPI 503 beacons or all AS 365 N3 helicopters. It only applies to components specifically listed in paragraph 1.A of Eurocopter ASB AS365 No. 25.00.91 (or later EASA approved revision). The operator must consult that ASB to determine which serial numbers fall within scope. The list likely comprises a batch of CPI 503 beacons with known manufacturing or installation deficiencies affecting electrical bonding. Components already marked with a letter “C” after the serial number are excluded - that marking seems to indicate either a previous successful bonding check or factory compliance with the bonding specification.

Electrical bonding measurement. This is the core technical requirement. The AD does not define what electrical bonding means; it incorporates by reference the measurement method set out in H.R. Smith Service Bulletin HRS170407-2, attached as Appendix 1 to the Eurocopter ASB. That SB prescribes a test procedure and pass/fail criteria in its paragraph 3. The bonding measurement appears to measure the resistance or impedance between the CPI beacon components and the helicopter structure. Insufficient bonding makes the system susceptible to electromagnetic interference, causing spurious deployment.

Hoist and sling configurations. The AD draws a sharp distinction between helicopters with actual hoist or sling installations (removable parts) and helicopters that only have fixed structural provisions for hoist or sling (meaning the helicopter is wired or fitted with mounting points but no removable hoist or sling is currently installed). This distinction affects the compliance actions and timelines. For helicopters with removable hoist or sling, a bonding failure leads to an immediate operational prohibition on hoist and sling use. For helicopters with fixed provisions only, the failure leads only to a replacement requirement; no operational prohibition is needed because the hoist or sling is not in service. The distinction recognises that the risk of electrostatic discharge during hoisting operations is absent when no hoist or sling is installed.

Serviceable parts. The AD requires replacement of failed CPI beacon components with “serviceable parts”. This term, though not defined in the AD itself, is a standard aviation maintenance concept meaning parts that meet all applicable airworthiness standards. In this context, a serviceable part would be a CPI 503 component that either already has a “C” mark indicating it passed the bonding measurement, or is a new part not subject to the same bonding deficiency. The AD does not specify a source for serviceable parts; the operator must source them through normal supply channels, bearing in mind that spare components without a “C” mark cannot be installed until they pass the bonding check.

Placard. Requirement 3.a. requires installation of a placard in full view of the flight crew, in accordance with paragraph 2.B.4.c of the Eurocopter ASB. The placard is a permanent visual reminder that hoist and sling operation is prohibited. Its placement must be such that flight crew cannot miss it during pre flight checks. This is a standard aviation safety tool to prevent operation of non conforming systems.

Compliance cascade. The AD sets multiple deadlines that are interdependent. The initial bonding measurement for hoist/sling helicopters must be done within 15 hours time in service. If the measurement fails, the placarding and circuit breaker disengagement must occur before the next flight. Replacement may take up to three months, but during that period the helicopter cannot perform hoisting or sling operations. This creates a practical economic cost: an operator who relies on hoisting or sling operations (e.g., for external load work, rescue, or construction) loses that capability for up to three months while sourcing replacement parts. For helicopters with fixed provisions only, the measurement must be done before any hoist or sling is installed, meaning an operator cannot simply defer compliance and then add a hoist later without first fulfilling the bonding check.

The primary duty holders are the registered operators and owners of Eurocopter AS 365 N3 helicopters equipped with CPI 503 Crash Position Indicator beacon components. The AD does not distinguish between private, commercial, or government operators. Any helicopter on the Australian civil register that falls within the applicability paragraph is subject to the directive. Operators of helicopters with removable hoist or sling installations face the most immediate impact because of the operational prohibition in the event of a bonding failure. Operators of helicopters with only fixed structural provisions face a less urgent but still mandatory compliance window.

Maintenance organisations approved to perform airworthiness work on these helicopters are affected indirectly. They must have access to Eurocopter ASB AS365 No. 25.00.91 (or later EASA approved revision) and the H.R. Smith SB HRS170407-2. The AD requires measurement in accordance with the instructions in paragraph 2.B.2 of the Eurocopter ASB and the detailed instructions in the H.R. Smith SB. Maintenance providers must ensure that their technicians are trained in these procedures and that the necessary test equipment is available. The AD does not require an approved maintenance organisation (AMO) rating beyond what is already required for the helicopter type, but it imposes a specific additional task.

Part suppliers and distributors of CPI 503 beacon components are affected by Requirement 7. Spare components listed in the ASB that do not have a “C” marked on their serial number cannot be supplied as serviceable replacements unless the bonding measurement is performed and the part passes. This may reduce the pool of immediately available spares and could cause delays in sourcing replacement parts. Operators may need to order new components from Eurocopter or from alternative approved sources, subject to lead times and costs.

The crew, specifically pilots and hoist operators, are affected by the placard requirement and the operational prohibition. If a bonding failure is detected, the flight crew must verify that the hoist or sling circuit breakers are disengaged before flight. The placard serves as a checklist item. Pilots must also be aware that if the CPI beacon is not properly bonded, there is a risk of uncontrolled deployment even if hoist or sling operations are not occurring. The Background notes that uncontrolled CPI beacon deployment creates a risk of injury to persons on the ground. This affects ground crew, passengers, and anyone near the helicopter during ground operations.

CASA itself is affected as the issuing authority. The AD was signed on 28 May 2008 by James Coyne as a delegate of CASA. CASA is responsible for ensuring compliance and may conduct surveillance of operators to verify that the bonding measurements, markings, replacements, and placarding have been carried out. The AD does not specify a record keeping requirement, but standard CASA practice would require that the maintenance actions be documented in the helicopter’s maintenance records.

Manufacturers are also indirectly affected. Eurocopter (now Airbus Helicopters) and H.R. Smith (the CPI beacon component manufacturer) are referenced in the ASBs. The AD relies on the manufacturers’ service bulletins to define the affected components and the measurement procedure. These bulletins were likely developed in response to the reported incidents. The AD creates a market for the approved bulletins: operators must obtain them to comply. This is typical of ADs that incorporate manufacturer documents by reference.

The AD creates a set of mandatory duties that override the operator’s discretion to choose maintenance intervals or operational configurations. The duties are specific, time limited, and non delegable.

Duty to identify. The operator must locate all CPI 503 beacon components on the helicopter and compare their serial numbers against the list in paragraph 1.A of Eurocopter ASB AS365 No. 25.00.91. Components whose serial numbers are not followed by a letter “C” must be flagged for bonding measurement. This identification must be performed within the applicable compliance time: for hoist/sling helicopters, within 15 hours time in service after the effective date; for fixed provision helicopters, before installation of any hoist or sling or within one month; for spare parts, before installation.

Duty to measure electrical bonding. The operator must carry out the bonding measurement in accordance with the instructions in paragraph 2.B.2 of the Eurocopter ASB, which incorporates the H.R. Smith SB. The measurement must be performed on each affected component. The AD implies that the measurement is a one time event - if the component passes, it is marked and no further measurement is required. If it fails, it must be replaced. There is no recurring periodic measurement requirement.

Duty to mark. If the bonding measurement result meets the criteria in paragraph 3 of the H.R. Smith SB, the operator must mark the letter “C” after the serial number of the checked CPI beacon component. This marking appears to be a physical stamp or engraving on the component itself. It creates a permanent record that the component has been verified as compliant. The marking also serves as an airworthiness identifier for future installation.

Duty to cease operations and placard. For helicopters with removable hoist or sling installations where a component fails the bonding measurement, the operator must immediately disengage the hoist or sling circuit breakers and install a placard in full view of the flight crew. The placard must be in accordance with paragraph 2.B.4.c of the referenced Eurocopter ASB. This duty arises before the next flight after the measurement. The operator has no discretion to delay or to continue operations pending replacement of the failed part.

Duty to replace. Failed CPI beacon components must be replaced with serviceable parts. For hoist/sling helicopters, replacement must be accomplished within three months after the effective date, but the operational prohibition lasts until replacement. For fixed provision helicopters, replacement must be done before installation of a hoist or sling, or within three months after the effective date, whichever occurs first. For spare parts, they cannot be installed without passing the bonding check, effectively requiring replacement with a passing part.

Duty not to install non compliant spares. Requirement 7 is a prohibition: no person may install a CPI beacon component whose serial number appears in the ASB list without a “C” mark, unless it has passed the bonding measurement and been marked accordingly. This applies to any helicopter, not only those originally fitted with the hoist/sling configuration. It effectively creates a supply chain restriction.

Rights. The AD does not explicitly grant rights, but it implicitly preserves the operator’s right to operate the helicopter in all respects other than hoist/sling operation. The AD does not ground the helicopter entirely. It also preserves the right to use alternative means of compliance subject to CASA approval, though no specific provision for an alternative means of compliance (AMOC) is stated in the text. Standard CASA practice allows operators to request an AMOC under regulation. The operator also has the right to request an extension of the compliance time from CASA, though the AD does not mention this. The referenced service bulletins create a right for operators to obtain the bulletins from the manufacturers (presumably at cost) to understand the exact measurement method and affected serial numbers.

The AD text itself does not specify penalties. Enforcement arises under the general framework of the Civil Aviation Act 1988 and Civil Aviation Safety Regulations 1998 (CASR). An airworthiness directive is a legislative instrument; failure to comply is a breach of the Act and Regulations. Penalties under the Act can include fines, imprisonment, and suspension or cancellation of certificates and licences.

Specifically, operating an aircraft that does not comply with an applicable AD may constitute operating an unairworthy aircraft. Under CASR Part 42 (Continuing Airworthiness) and Part 91 (General Operating and Flight Rules), an operator must ensure that all ADs are complied with before flight. If an operator flies a helicopter with a failed CPI beacon component without having performed the required disengagement and placarding, that would likely be a breach of the airworthiness requirements. Similarly, installing a non compliant spare part in breach of Requirement 7 would breach maintenance regulations.

CASA has enforcement powers including issuing infringement notices, accepting enforceable undertakings, and initiating prosecution. The Australian Transport Safety Bureau (ATSB) may also investigate any incident involving an uncontrolled CPI beacon deployment if it results from non compliance. The Background notes the risk of injury, so non compliance creates both a regulatory breach and a safety hazard.

The AD is effective from 29 May 2008. Operators who fail to complete the 15 hour time in service measurement within that window would be in immediate breach. The AD does not provide any grace period beyond the stated compliance times. However, in practice, CASA may consider factors such as availability of replacement parts or maintenance capacity when deciding enforcement action. The three month window for replacement acknowledges that parts may not be immediately available, but the operational prohibition applies immediately upon failure, so the operator cannot simply fly waiting for parts.

Civil liability may also arise if an uncontrolled CPI beacon deployment causes injury or damage, and the operator failed to comply with the AD. Compliance with an AD is a minimum safety standard; failure to comply would likely be used as evidence of negligence in any civil claim.

Record keeping is not explicitly mandated in the AD, but standard maintenance regulations require that all AD compliance actions be recorded in the aircraft maintenance log or equivalent system. CASA inspectors can verify compliance by examining these records. Failure to keep accurate records of the bonding measurement, marking, placard installation, and replacement would itself be a breach of record keeping obligations under CASR Part 42.

The AD does not exist in isolation. It interacts with the broader aviation regulatory framework in several ways.

EASA AD 2008-0096-E. The AD notes in its final paragraph that EASA Emergency AD 2008-0096-E refers. This means that a parallel European directive exists. For helicopters that are imported or have European type certification, compliance with the EASA AD is likely a condition of continued certification in the European Union. The Australian AD effectively adopts the same requirements for Australian registered helicopters. If the EASA AD is later amended or withdrawn, the Australian AD would remain in effect until specifically superseded or amended by CASA. Operators with dual registrations or who fly in European airspace must comply with both, but the requirements are likely identical.

Other airworthiness directives. The AD applies to AS 365 N3 helicopters specifically. Other ADs may apply to the same helicopter in relation to different systems. The AD does not relieve operators from complying with any other ADs. Cumulative compliance burdens can be significant. For example, if another AD requires an engine inspection within a similar time window, the operator must schedule maintenance to meet both deadlines. The AD’s requirement to disengage hoist circuit breakers may conflict with other operational requirements that demand a functioning hoist; in that case, the AD takes precedence.

Service bulletins (non mandatory). The AD incorporates by reference two service bulletins: Eurocopter ASB AS365 No. 25.00.91 (Alert Service Bulletin) and H.R. Smith SB HRS170407-2. Service bulletins are normally optional recommendations from manufacturers. By incorporating them into an AD, they become mandatory. The operator must have access to the bulletins and follow them precisely. The bulletins themselves may be updated; the AD allows use of later revisions approved by EASA. If the bulletin is revised, the operator must check which revision is current.

Civil Aviation Act and Regulations. The AD is a legislative instrument made under the Act. It has the force of law. Non compliance is an offence. The AD does not conflict with the Act or Regulations; it supplements them by imposing specific additional requirements.

Work health and safety laws. The Background notes the risk of injury to persons on the ground. Depending on the jurisdiction, state or territory work health and safety laws may impose duties on employers to provide a safe working environment. Compliance with the AD would be consistent with those duties. However, if the AD is not complied with, the operator could face prosecution under both aviation law and work health and safety law for the same incident, depending on the circumstances.

Insurance. Compliance with ADs is typically a condition of aviation insurance policies. If a helicopter operator fails to comply with this AD and an accident occurs, the insurer may deny coverage on the basis that the aircraft was not airworthy. The AD’s requirement to disengage the hoist and sling circuit breakers upon a bonding failure is a clear operational limitation; ignoring it could constitute a breach of policy conditions.

Contract law. If the helicopter is operated under a charter or lease agreement, the agreement likely requires compliance with all applicable ADs. Failure to comply could be a breach of contract. The lessor or charterer may have rights to terminate the agreement or claim damages. The AD may also affect the helicopter’s market value if the bonding issue is not resolved, because a potential buyer would require evidence of AD compliance.

The source provided is the AD as issued on 28 May 2008 with an effective date of 29 May 2008. There is no amendment history contained within the text. The AD number is AD/DAUPHIN/96, and the issue is “8/2008 TX”. The AD appears to be a new directive, not a revision of a previous directive. The note referencing EASA Emergency AD 2008-0096-E suggests that the EASA directive was issued on or shortly before that date, and the Australian AD mirrors it.

No information is provided about whether this AD has been superseded, amended, or withdrawn since 2008. For a deep dive, we must rely solely on the source. It is common for ADs to be revised over time as more information becomes available, but that cannot be assumed. The absence of amendment history in the source is informative: it tells us that as of the date of the source, the AD was in its original form.

Operators should check the CASA AD database to confirm whether any amendments have been issued after 2008. The AD may have been reissued with a later number or incorporated into a consolidated AD. The reference to “8/2008 TX” likely indicates the AD was issued in 2008, serial number 8 of that year. The “TX” may mean “text only” or be an internal CASA code.

Because this AD is nearly 17 years old as of the date of this analysis (assuming current year 2025), it is highly likely that it has been superseded or that the affected components have been replaced on all in service helicopters. However, the directive remains legally effective until formally withdrawn. Any helicopter that still has original affected CPI 503 components not marked with a “C” would still be subject to the AD. The possibility of such helicopters still operating is low, but not impossible for aircraft that have been in storage or have not undergone the required checks.

Given the age of the AD, a careful operator would verify the current compliance status of any AS 365 N3 they acquire. A non compliance on an old AD could still lead to enforcement action.

The source text contains no references to any litigation, tribunal decisions, or court cases. This is typical for a routine airworthiness directive that does not involve novel legal principles or large financial interests. AD compliance disputes are usually resolved administratively through CASA enforcement processes rather than through the courts. An operator who disagrees with an AD may apply for an alternative means of compliance or seek judicial review of the decision to issue the AD, but such actions are rare unless the AD imposes extreme costs or is procedurally flawed.

It is worth noting that ADs are legislative instruments and can be challenged on administrative law grounds if the delegate acted beyond power, failed to follow procedures, or made an error of law. The AD here was signed by a CASA delegate on 28 May 2008. The recitals state that Eurocopter received several reports of uncontrolled CPI beacon deployments. The AD does not elaborate on the number of incidents or the evidence base. An operator could theoretically argue that the AD is disproportionate or not supported by evidence, but the courts generally give deference to aviation safety regulators on technical matters.

No case law involving AD/DAUPHIN/96 appears in the source. A search of Australian legal databases is not possible within the confines of this analysis, but given the obscure nature of this AD, litigation is extremely unlikely. The affected helicopter type is not a high volume commercial aircraft; the AS 365 N3 is a medium utility helicopter used in limited numbers in Australia. The cost of compliance is relatively low (measurement and possible replacement of a small component), so there is little financial incentive to litigate.

The absence of litigation history should not lead to complacency. It simply indicates that the AD has been implemented without legal challenge. The enforcement history is unknown. CASA may have issued infringement notices for non compliance in the past, but that information is not in the source.

Several aspects of the AD could catch operators off guard if not read carefully.

The 15 hour time in service window for hoist/sling helicopters is tight. The AD becomes effective on 29 May 2008. An operator that uses the helicopter heavily could accrue 15 flight hours in a matter of days. If the helicopter is operating in a remote location without access to the service bulletins or test equipment, the operator may not be able to perform the measurement in time. There is no extension built into the AD for parts availability for the measurement itself (though the replacement has a three month window). The measurement must be done within 15 hours regardless of operational circumstances. Failure to do so is a breach even if the downstream operational prohibition never takes effect.

The distinction between “hoist or sling” and “fixed parts of hoist or sling installations” is easily misunderstood. An operator who has a helicopter with structural provisions but no actual hoist installed might think the AD does not apply. It does apply, but with different timelines. If the operator later installs a hoist without having performed the bonding measurement, they would be in breach. The AD requires the measurement before installation. This is a trap for operators who defer compliance and then decide to add a hoist.

The marking requirement is permanent and physical. The AD does not allow a simple logbook entry. The letter “C” must be marked after the serial number on the component itself. If the component is in an inaccessible location, marking may be difficult. The AD does not specify the method of marking (engraving, etching, paint) but it must be permanent and visible. If the marking wears off during service, the component could be mistakenly considered non compliant in future.

The spare parts restriction creates a supply chain complication. Requirement 7 prohibits installation of any spare CPI beacon component that is listed in the ASB without a “C” mark, unless it is checked and passes. This means that even if the component is new from the manufacturer, it may still be affected if its serial number falls within the listed range. The AD effectively deems certain serial numbers as suspect until proven compliant. A maintenance organisation that receives an unmarked spare from stock cannot install it without performing the bonding measurement, even if the helicopter itself has no hoist or sling. This can cause delays and additional labour cost.

The placard must be “in full view of the flight crew”. If the placard is placed in a location that is not easily seen during pre flight checks, the AD is not complied with. The AD references paragraph 2.B.4.c of the Eurocopter ASB for placard specifications. An operator who fabricates a placard without following that specification risks non compliance. The placard must likely contain specific text and dimensions.

The AD does not specify record keeping requirements, but standard maintenance regulations do. An operator who performs the bonding measurement and marking but fails to document it in the maintenance records may not be able to prove compliance in the event of a CASA audit or when selling the aircraft. The AD’s silence on records does not excuse the operator from the broader obligation.

The AD’s effective date is the day after signing. It was signed on 28 May 2008 and effective on 29 May 2008. That gives operators zero lead time. The AD is technically binding from 29 May, though CASA might exercise discretion for early non compliance. Operators must be ready to act immediately.

Uncontrolled CPI beacon deployment risk is not limited to hoist or sling operations. The AD only requires action for helicopters configured for hoisting or sling operations, based on the rationale that electrostatic discharge risk is highest during those operations. However, the Background notes that uncontrolled deployment can occur on the ground even without hoist operations, creating risk of injury to persons on the ground. Helicopters without hoist or sling installations are not required to perform the bonding check, even though the same CPI beacon components may be faulty. This creates a gap where a helicopter without a hoist could still have a beacon that deploys unexpectedly. The AD does not address that risk; it is a limitation of the directive’s scope.

Compliance with AD/DAUPHIN/96 involves a sequence of steps that can be integrated into the operator’s existing maintenance program. The following procedure is derived directly from the AD requirements.

First, determine the helicopter’s configuration. Check whether the helicopter has a removable hoist or sling installation, or only fixed parts of hoist or sling installations (structural provisions). If neither are present, the AD does not apply, but note the spare parts restriction still affects the operator if they hold spare CPI beacons.

Second, obtain the referenced documents: Eurocopter Alert Service Bulletin AS365 No. 25.00.91 dated 26 May 2008 (or later revision approved by EASA) and H.R. Smith Service Bulletin HRS170407-2 dated 20 March 2007. These bulletins are essential; the AD incorporates them by reference. Without them, the operator cannot identify the affected serial numbers or perform the bonding measurement correctly. The bulletins may be purchased from the manufacturers or downloaded from their technical portals.

Third, locate all CPI 503 beacon components on the helicopter. The AD does not specify where these components are mounted. Typical locations include the tail boom or underbelly of the helicopter. Compare each component’s serial number against the list in paragraph 1.A of the Eurocopter ASB. If the serial number is not listed, the component is not affected. If it is listed and is not followed by a letter “C”, it is affected and must be checked.

Fourth, for each affected component, measure the electrical bonding in accordance with paragraph 2.B.2 of the Eurocopter ASB, which refers to the detailed instructions in the H.R. Smith SB. This likely involves using a bonding tester (milliohm meter) to measure resistance between the component and the helicopter structure. The pass/fail criteria are in paragraph 3 of the H.R. Smith SB. Record the measurement results.

Fifth, if the measurement meets the criteria (pass), mark the letter “C” after the serial number on the component. This can be done by engraving, stamping, or using a permanent marker approved for aircraft parts. No further action is required for that component.

Sixth, if the measurement fails, determine the helicopter configuration. For helicopters with hoist or sling installations: (a) disengage the hoist circuit breakers per paragraph 2.B.4.a of the Eurocopter ASB, or the sling circuit breakers per paragraph 2.B.4.b; (b) install a placard in full view of the flight crew per paragraph 2.B.4.c; (c) operation of the hoist and sling is prohibited until replacement; (d) replace the affected CPI beacon components with serviceable parts within three months after the effective date. For helicopters with fixed provisions only (no hoist/sling), replace the affected components before installation of any hoist/sling, or within three months after the effective date, whichever occurs first. No placard or operational prohibition is needed.

Seventh, for spare CPI beacon components held in inventory that are listed in the ASB but lack a “C” mark, do not install them on any helicopter until the bonding measurement is performed and they pass. If they pass, mark the “C” on the serial number; if they fail, do not install, and they must be scrapped or returned to the supplier.

Eighth, document all actions in the aircraft maintenance log or continuing airworthiness record system. This should include: the AD reference, the date of compliance, the serial numbers of checked components, the bonding measurement results, the marking applied, any replacement parts installed, and the placard installation. For the operational prohibition, note the entries regarding circuit breaker disengagement and placard. The documentation will serve as evidence of compliance for CASA inspections and for future transfers of ownership.

Finally, maintain the placard and circuit breaker disengagement as long as the failed component remains on the helicopter. Once the component is replaced with a serviceable (marked “C”) part, the placard can be removed and the circuit breakers re engaged. The helicopter logbook should be updated accordingly.

If the operator cannot meet the 15 hour time in service deadline for the initial measurement, they should contact CASA immediately to request an extension or alternative means of compliance. However, the AD does not explicitly provide for extensions, so the operator should not rely on obtaining one.