AD/OH-58/1 - State of Design Airworthiness Directives

Airworthiness Directive (AD). An AD is a mandatory instruction issued by a civil aviation authority to correct an unsafe condition in an aircraft, engine, propeller, or appliance. Compliance with ADs is a continuing condition of the certificate of airworthiness under CASR 1998. Non-compliance can render the aircraft unairworthy. ADs can require inspections, modifications, parts replacements, operational limitations, or changes to maintenance procedures.

State of Design Airworthiness Directive. This is a specific category of AD used by CASA where the unsafe condition has been identified by the state of design (the country that originally type-certificated the aircraft). For American-type-certificated aircraft, the state of design is the FAA. CASA may adopt FAA ADs directly or modify them. This AD adopts nine FAA ADs without change; it does not add or subtract any substantive requirement. Operators must follow the FAA AD as written, including any FAA-approved alternative means of compliance or extensions.

Incorporation by reference. The AD does not restate the actions required by the FAA ADs. Instead, it makes the FAA ADs legally enforceable in Australia by reference. This is common but creates a burden: the operator must locate, read, and interpret the FAA ADs. The FAA ADs are publicly available but not printed with the CASA instrument. The table lists the AD numbers (e.g., 2005-21-03), effective dates (21 November 2005), and short titles (e.g., “Tail Rotor Blade Root Doubler”). The full text must be obtained separately.

Compliance time. This AD uses a hybrid compliance time: 30 days after the effective date of the Australian AD, or prior to the issue of a certificate of airworthiness, whichever is later. The term “later” means if the certificate of airworthiness is issued after the 30 days have elapsed, the earlier deadline is the 30 days; but if the certificate has not yet been issued at the 30-day mark, compliance can wait until immediately before issuance. However, for an aircraft already holding a certificate of airworthiness on 28 August 2008, the compliance time is 30 days after that date (i.e., by 27 September 2008). The AD does not specify what happens if the 30-day deadline is missed but the certificate of airworthiness remains valid,the aircraft would be non-compliant immediately after 27 September 2008.

Applicability determination. The AD requires the operator to “determine the applicability” of each listed FAA AD. This is a non-trivial task. The FAA ADs often specify applicability by helicopter serial numbers, part numbers of affected components, or installation status of certain modifications. The operator must have access to the aircraft’s complete configuration records, modification history, and component serial numbers. The AD acknowledges that not all ADs will apply, but it places the onus of that determination on the operator, not on CASA.

Effective date. The AD becomes effective on 28 August 2008. After that date, the AD is legally binding. There is no phase-in or transitional period beyond the 30-day compliance window.

The primary group affected comprises the registered owners and operators of Bell OH-58A (206A-1) series helicopters on the Australian civil aircraft register. The OH-58A is a military-derived light observation helicopter that was originally designed for the US Army. In civilian hands, it is used for utility work, aerial survey, training, and private transport. The fleet in Australia is likely small, perhaps a handful of aircraft imported from US military surplus or from civilian operators. The AD also affects any organisation that manages or maintains these helicopters on behalf of owners, including approved maintenance organisations (AMOs) licensed under CASR Part 145.

Maintenance engineers responsible for planning and performing airworthiness tasks must incorporate the requirements of each applicable FAA AD into their maintenance schedules. Engineering personnel need to obtain copies of each FAA AD, read them, and ensure the required actions are carried out within the FAA’s compliance times, which are not restated in the Australian AD. This is a compliance burden that falls on small maintenance shops that may not have ready access to FAA regulatory data.

Anyone considering purchasing an OH-58A and importing it into Australia after the effective date will need to ensure that the aircraft either already complies with the listed FAA ADs, or that compliance is achieved before a certificate of airworthiness is issued. This affects aircraft brokers, importers, and private buyers.

In a broader sense, the AD affects the insurers of these helicopters. Insurance policies typically require compliance with all applicable ADs as a condition of coverage. A gap can void or restrict coverage. The AD also affects lessors and financiers who hold security over the aircraft; non-compliance may reduce asset value or create legal risk.

Finally, CASA itself is affected administratively. It must process any requests for alternative means of compliance or extensions if an operator cannot meet the compliance time. However, the AD does not mention any CASA-endorsed AMOC process; that would need to be sought under CASR Part 39 generally.

The AD does not affect unaffected helicopter models; it is specific to the OH-58A. Nor does it affect operators who no longer hold a certificate of airworthiness for such an aircraft.

First duty: determine applicability. The operator must analyse each of the nine FAA ADs listed in Table 1 against the specific aircraft’s configuration, modification status, and component numbers. This is a proactive obligation; the operator cannot simply assume that none apply. The aircraft records must be reviewed. If records are incomplete, the operator may need to physically inspect the aircraft to identify components such as part numbers of tail rotor blades, main rotor hub yokes, strap fittings, and particle separation kits. The determination must be documented, because proof of compliance requires evidence of the decision process.

Second duty: perform actions. For each FAA AD determined to be applicable and not previously accomplished, the operator must perform the actions exactly as required by that AD. This could include one-off inspections, repetitive inspections, modification, part replacement, or component retirement. The AD does not provide any discretion to alter the FAA’s requirements, nor does it grant CASA delegates the power to approve alternative means of compliance within the text of the AD itself (though such powers exist under CASR generally). The actions must be accomplished within the compliance time specified in the FAA AD, but subject to the overall compliance time in this Australian AD (the later of 30 days after 28 August 2008 or prior to issue of certificate of airworthiness). If the FAA AD gives a longer compliance time (e.g., 500 flight hours), the FAA time still applies, provided it does not exceed the 30-day deadline.

Duty to maintain records. Although not explicitly stated in the AD, the broader regulatory framework under CASR Part 39 and Part 43 requires that compliance with each AD be recorded in the aircraft maintenance records. The operator must record the AD number, the date of compliance, the action taken, and the person or organisation that performed the work.

Rights of the operator. The only right explicitly implied is the right to determine that an FAA AD is not applicable and therefore not perform its actions. However, that determination must be defensible in the event of a CASA audit or after an incident. The operator has no right under this AD to an extension of time or alternative compliance. Such rights exist under the parent regulations (CASR 39.035), but they are not mentioned in the AD itself. Operators also have the right to request a review of CASA’s decision under administrative law, but that would arise only if CASA takes enforcement action.

No duty on CASA. The AD places all compliance burdens on the operator. CASA does not provide the FAA AD texts or any technical support. The AD’s background statement does not create any enforceable obligation on CASA to monitor or assist.

The AD itself does not prescribe specific penalties; it is a regulatory instrument whose breach triggers enforcement under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. Operating an aircraft that does not comply with an applicable AD is a breach of the continuing airworthiness requirements. Under CASR 39.015, an airworthiness directive is legally enforceable and non-compliance means the aircraft is not airworthy. Any person who operates an aircraft knowing it does not comply with an AD may be subject to civil penalties, infringement notices, or criminal prosecution.

Penalties under the Civil Aviation Act can be significant. For an individual, the maximum penalty for operating a non-airworthy aircraft can be hundreds of penalty units (currently one penalty unit is $313, so up to tens of thousands of dollars for individuals, and higher for bodies corporate). In addition, CASA can suspend or revoke the certificate of airworthiness, effectively grounding the aircraft. That would impose ongoing economic costs until compliance is achieved. CASA also has the power to issue enforceable undertakings or accept infringement notices with fines, avoiding formal prosecution.

Enforcement can be triggered by routine surveillance, ramp inspections, or accident investigations. An operator cannot rely on ignorance of the AD as a defence; the AD was published in the CASA AD Gazette and is deemed to be known.

Civil liability also arises. If an incident occurs that is linked to non-compliance with an FAA AD adopted by this AD, the operator may face negligence claims, breach of statutory duty, or difficulty defending against contribution claims. Insurance policies typically exclude coverage for non-compliance with ADs.

The AD’s compliance time (30 days or earlier) is short. Missing that deadline, even by a day, technically renders the aircraft non-airworthy. There is no grace period in the AD itself. An operator who misses the deadline but later complies may still face enforcement action for the period of non-compliance.

The AD does not mention immunity or limited liability for CASA if the AD is later found to be unnecessary. Liability for defective ADs is not addressed.

CASR Part 39 (Airworthiness Directives). This is the parent regulation. AD/OH-58/1 is issued under CASR 39.001 and 39.003. It supplements the general requirement that all airworthiness directives must be complied with. Part 39 also provides for alternatives, requests for extension, and the process for revocation of ADs. This AD does not override any of those general provisions.

CASR Part 43 (Maintenance). Compliance with an AD constitutes maintenance. The work must be carried out by appropriately authorised persons and recorded in the aircraft logbook or maintenance release. Part 43 sets out the standards for documenting and certifying the work.

Civil Aviation Act 1988, section 20A. This section gives CASA the power to issue airworthiness directives. The AD is validly made under that authority.

Airworthiness Orders. The AD may interact with specific airworthiness orders that apply to the helicopter type, such as flight manual limitations or maintenance schedules. If the FAA AD requires a modification that conflicts with an existing Australian requirement, the operator may need to seek CASA approval for a deviation. The AD does not address such conflicts.

Foreign law. The FAA ADs referenced are US law. While the Australian AD makes them mandatory here, it does not change their content. If the FAA later amends or supersedes one of the listed ADs, the Australian AD still refers to the older version unless and until CASA amends this AD. There is no automatic update mechanism. Operators therefore may need to be aware that the FAA version referenced in Table 1 may no longer be current in the US, but it remains the mandatory version in Australia until CASA issues a new AD. This creates a potential divergence between Australian and US airworthiness requirements.

Import requirements. For an aircraft not previously registered in Australia, the issuance of a certificate of airworthiness is the trigger for the later compliance time. The AD interacts with CASR Part 21 (certification of aircraft). Before a certificate of airworthiness can be issued, the applicant must show compliance with all applicable ADs. This AD therefore must be addressed during the import process.

State of Design reliance. The background states that CASA has determined the FAA ADs “may be applicable.” This is not a finding that they are all mandatory regardless. The determination of actual applicability remains with the operator. If an operator disagrees that a particular FAA AD is applicable, the operator must be prepared to justify that position under CASR. The AD does not give CASA an independent obligation to verify applicability.

The source provided is AD/OH-58/1, with the number 9/2008, signed 7 July 2008, effective 28 August 2008. There are no amendments shown. The AD is a single issue; there is no record of a revised version, a superseding AD, or a withdrawal. That is typical for state-of-design ADs that simply adopt a list of FAA ADs en bloc. However, because each referenced FAA AD may itself have been amended by the FAA (revisions, new series numbers, or superseding ADs), the effective content of this Australian AD changes indirectly only if CASA issues a new AD listing the revised FAA ADs. No such amendment is disclosed in the source.

The AD does not contain a sunset clause. It remains in force indefinitely unless explicitly revoked. Given the age of the AD (2008), it likely remains in force today. Operators should confirm with CASA’s current AD database whether any subsequent ADs have replaced or supplemented AD/OH-58/1. The source does not indicate that the AD is still current, but it has not been repealed on the face of it.

The list of FAA ADs in Table 1 is fixed as at the date of the instrument. The FAA ADs themselves span from 1971 (71-08-03) to 2005 (2005-21-03). The AD does not include any later FAA ADs issued after 2005 that may be relevant. This is a potential gap. CASA may have issued other ADs for the OH-58A separately for post-2005 FAA ADs.

The source does not mention any litigation directly involving AD/OH-58/1. It is unlikely a simple state-of-design AD has been litigated in its own right. Typically, such ADs are enforced administratively and rarely reach court. If litigation did occur, it would most likely be in the context of an accident investigation or a prosecution under the Civil Aviation Act, where the AD’s validity or applicability was challenged.

One potential litigation issue is whether CASA properly adopted the FAA ADs. If an operator argued that an FAA AD was not actually applicable to the Australian fleet, or that CASA failed to follow its own procedures in issuing the AD, that could be raised in enforcement proceedings. However, courts generally defer to CASA’s technical judgment in airworthiness matters. There is no known case in Australia specifically concerning AD/OH-58/1.

In the United States, some of the individual FAA ADs may have been the subject of petitions for reconsideration or exemptions, but those would not be directly binding in Australia.

Practitioners should be aware that the absence of litigation history does not mean the AD is undisputed. It may simply reflect that the fleet is very small and compliance has been achieved without legal challenge. If a compliance dispute arises, the Civil Aviation Act 1988 and CASR Part 39 would be the legal framework, not the AD itself.

Compliance time ambiguity. The phrase “within 30 days after the effective date of this Directive or prior to the issue of a certificate of airworthiness, whichever occurs later” can be misinterpreted. If an aircraft already has a certificate of airworthiness, the compliance time is 30 days after 28 August 2008 (by 27 September 2008). But if the aircraft does not yet have a certificate, compliance must be achieved before the certificate is issued,which could be years later. However, if the certificate is issued after the 30 days have passed, the “later” event is the certificate issuance, so the operator has until that point. But the wording “whichever occurs later” means the operator must take the longer of the two periods. For a new import, that could be a long deferral, but only if the certificate of airworthiness is issued after the 30 days. If the certificate is issued within the 30 days, the 30-day deadline controls. This is confusing and operators should err on the side of earlier compliance.

No FAA AD text provided. The AD lists only the AD number, effective date, and title. Operators must find and interpret the FAA ADs themselves. For older ADs (some from the 1970s), obtaining the exact version referenced may be difficult. The FAA’s current AD database may show revised versions that differ. The Australian AD does not automatically refer to the latest revision; it refers to the version that existed at the time of publication. If the FAA later amended the AD, the Australian AD still requires compliance with the older version unless CASA amends. That could create confusion where an operator complies with a later revision thinking it satisfies the older one.

Applicability determination is onerous. The AD does not list serial numbers, part numbers, or configuration criteria. The operator must infer applicability by reading each FAA AD and cross-referencing with aircraft records. For an aircraft with incomplete records, this is a significant burden. Misidentification of a part or modification can lead to non-compliance.

Repetitive actions may be overlooked. Some FAA ADs require repeated inspections or replacement at intervals. The Australian AD only says “perform the actions required by that AD.” If the action is a one-time inspection, compliance is achieved once. But if the action is repetitive (e.g., “repeat every 100 hours”), the Australian AD implicitly makes that repetition mandatory for the life of the aircraft. Operators may think compliance is a one-off event. Not so.

No amnesty for past non-compliance. If the FAA ADs were applicable before the Australian AD was issued, there is no provision forgiving past non-compliance. The AD says “if it is determined that an FAA AD … has not been previously accomplished.” The word “previously” refers only to whether the action was done before the effective date of this AD. If the FAA AD became effective in 1976 and the action was never done, it must still be done now, even if decades late.

Lack of AMOC in the AD. The AD does not state that CASA can approve alternative means of compliance. That authority exists under CASR Part 39, but a busy operator might not know to seek it. The AD could be read literally as requiring compliance with the FAA AD exactly, with no flexibility. CASA would likely accept a formally approved alternative, but the AD’s silence creates uncertainty.

Step 1: Obtain the full text of each FAA AD listed in Table 1. These are available on the FAA’s website (rgl.faa.gov) or from commercial subscription services. Note the exact AD number and revision; ensure you have the version current at the time of this Australian AD (2008). If the FAA has later amendments, verify with CASA whether the later version is acceptable.

Step 2: Review aircraft records. Collect all maintenance records, logbooks, modification approval sheets, and component history for your helicopter. Pay special attention to parts referenced in the FAA AD titles: tail rotor blade root doubler, chip detector, tail rotor blade assembly, trunnion, rotor blade straps, main rotor blade tension-torsion strap, main rotor hub yokes, rotor blade pillow block assemblies, pitch link assembly, main rotor blade grips, strap fittings and pins, main rotor retention straps, and particle separation kit. Record serial numbers and part numbers.

Step 3: Determine applicability for each FAA AD. Read the “Applicability” paragraph of each FAA AD. Compare the criteria against your aircraft’s configuration. For example, AD 2005-21-03 (Tail Rotor Blade Root Doubler) may only apply to certain tail rotor blade part numbers. Document your determination for each AD, including the reasoning if an AD is found not applicable. This documentation is crucial in case of audit.

Step 4: For each applicable AD not previously accomplished, schedule and perform the required actions. The actions must be completed by the later of 27 September 2008 or before the next issue of a certificate of airworthiness. If the FAA AD specifies a longer compliance time (e.g., “within 100 hours time-in-service”), that time runs from the effective date of this AD unless the FAA AD says otherwise. For repetitive actions, the first cycle begins now.

Step 5: Certify and record compliance. After performing the actions, have an authorised person make an entry in the aircraft maintenance records. Include the Australian AD number (AD/OH-58/1), the specific FAA AD number, a description of the work, the date, and the signature of the certifying maintenance engineer. The entry should also indicate when the next repetition is due if applicable.

Step 6: Recurring actions. Identify which FAA ADs require ongoing compliance. Add those tasks to the aircraft’s approved maintenance schedule. Ensure they are tracked in a system that alerts when each repetition is due. Treat them as mandatory regardless of any other maintenance scheduling.

Step 7: Keep copies of all FAA ADs referenced for future reference. If CASA audits the aircraft, you must show that you were aware of the correct content of each AD and that you correctly determined applicability.

Step 8: If you cannot meet the compliance time or find the requirement impossible, contact CASA immediately to request an extension or an alternative means of compliance under CASR Part 39. Do not simply ignore the deadline.

Step 9: For any OH-58A acquired after the AD’s effective date, verify that the previous owner complied with AD/OH-58/1. Obtain records showing compliance with each applicable FAA AD. If records are missing, treat the aircraft as non-compliant and perform the actions before flight.