AD/PROP/6 - "Fastprop" Propeller De-Icers

Airworthiness Directive (AD). An AD is a legally enforceable notification issued by CASA under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations (CASR). It mandates corrective action on aircraft or aircraft components that have been found to pose an unsafe condition. Compliance is mandatory; failure to comply can result in enforcement action including fines, suspension, or cancellation of airworthiness certificates. The AD in question is AD/PROP/6, number 13/2005, effective 22 December 2005.

FASTprop propeller de-icer. This is a specific product line of Goodrich De-icing and Specialty Systems designed to be attached to propeller blades to prevent ice accretion. The part numbers listed in the applicability clause (such as P4E1188 series, P4E1601 series, and others) define the exact components subject to the directive. The AD applies only to these part numbers when installed on an aircraft; it does not apply to the same de-icers held in stock not installed.

Debonding and detachment. The background states the AD results from reports of de-icers becoming loose or debonded from propeller blades and detaching during operation. Debonding refers to the failure of the adhesive bond between the de-icer and the propeller blade surface. This can lead to imbalance, vibration, and the de-icer becoming a projectile, potentially damaging the aircraft structure, engine, or control surfaces, and causing injury.

Terminating action. This is the defined action that, once completed, ends the recurring inspection requirements of the AD. In this case, terminating action is accomplished when the “FASTprop” propeller de-icer is removed and replaced with an approved propeller de-icer in accordance with paragraph 2.A(2) of the Goodrich ASB. The phrase “approved propeller de-icer” means a de-icer that has been approved under the applicable airworthiness standards (e.g., through a supplemental type certificate or as a direct replacement part). Once terminating action is completed, the operator no longer needs to perform the daily visual checks or the initial 10-hour inspection for that particular de-icer. However, if the operator installs a new “FASTprop” de-icer later (contrary to the terminating action), the AD would apply again to that unit.

Alert Service Bulletin (ASB). Goodrich ASB No. 30-60-00-1, dated 15 November 2004, contains the detailed instructions for inspection, repair, and replacement. The AD makes compliance with specified paragraphs of that ASB mandatory. An ASB is a manufacturer-issued document that alerts operators to a potential unsafe condition and recommends actions; when referenced in an AD, those recommendations become legally binding. The AD references paragraphs 2.A(2) (visual check), and 2.A(3) through (5) (detailed inspection, repair, or replacement). The content of those paragraphs is not reproduced in the AD, so operators must obtain the ASB from Goodrich.

Compliance times. The AD establishes four distinct compliance times: (1) within 10 hours after the effective date for the first detailed inspection; (2) before further flight after the effective date for any de-icer that fails that inspection; (3) once per day of operations for the visual check, which may be done by the pilot during the daily inspection; and (4) before the next flight if the visual check fails. These times are sequential: an operator must first comply with (1) and (2) as they apply, and then continue with (3) daily. The phrase “before further flight” means the aircraft cannot be flown again until the action is completed. “Before the next flight” means the defect must be addressed before the aircraft’s next departure.

Maintenance release. The AD requires that if the visual check fails, a defect must be entered in the maintenance release. The maintenance release (often called a maintenance release or certificate of release to service) is a document that records the airworthiness status of the aircraft and includes any outstanding defects and the actions taken. Entering a defect in the maintenance release triggers the requirement for corrective action before the next flight and alerts subsequent pilots and maintenance personnel.

The primary persons and entities affected by AD/PROP/6 are the owners and operators of aircraft that have Goodrich “FASTprop” propeller de-icers of the listed part numbers installed. These are typically general aviation aircraft, likely light twin-engine aeroplanes or single-engine turboprops, as propeller de-icers are used in icing conditions. The directive does not specify aircraft models but references a Table 1 in the FAA AD listing applicable propellers; that table is not reproduced, so operators must consult FAA AD 2005-18-20. Affected operators include private owners, flying schools, charter operators, aerial work operators (e.g., mustering, surveying), and possibly small regional airlines using turbine-powered propeller aircraft. Maintenance organisations (approved maintenance organisations under CASR Part 145 or licensed aircraft maintenance engineers) are affected because they may be called upon to perform the initial inspection and any necessary repairs or replacements. Pilots are directly affected: the AD permits the pilot to conduct the daily visual check as part of the daily aircraft inspection. If the pilot certifies the daily inspection, that implies the visual check has been completed. This places a specific duty on pilots to be aware of the AD and to perform the visual check correctly. If the visual check fails, pilots must ensure a defect is entered in the maintenance release and that the aircraft does not fly until the further inspection or repair is done. Ground staff and maintenance controllers may also be involved in scheduling the required actions. The AD also affects Goodrich as the manufacturer, though indirectly; the AD references Goodrich’s own service bulletin, which the company presumably prepared to address the unsafe condition. The existence of the AD may influence Goodrich’s liability exposure and may require them to support replacement parts and instructions. CASA itself is affected as the issuing authority; it must ensure the AD is promulgated, tracked, and enforced. The reference to FAA AD 2005-18-20 indicates that regulatory agencies in other jurisdictions are involved, and operators in Australia who also operate in the US or who have FAA-certificated aircraft must comply with both directives. The compliance burden falls disproportionately on smaller operators who may lack dedicated engineering support. For a private owner with a single aircraft, a failed de-icer can ground the aircraft until replacement parts are sourced and installed, causing loss of use and possibly missed flights or contracts. For a maintenance organisation, the AD creates workflow: obtaining the ASB, performing inspections, ordering parts, and documenting compliance. The cost of replacement de-icers (if terminating action is taken) is borne by the operator. The AD does not provide compensation or subsidy. The directive also affects parts suppliers and distributors of propeller de-icers; demand for “FASTprop” units will fall as operators switch to approved alternatives. This may reduce competition in the aftermarket for propeller de-icers, as the only approved replacement is one that meets the “approved” standard, which may be limited to a single type. The AD does not explicitly allow alternative means of compliance, but under CASR an operator could petition CASA for an alternative method if it provides an equivalent level of safety. That process itself imposes an administrative cost. Overall, the AD narrows the choices available to operators regarding propeller de-icing equipment, favouring approved replacements over continued use of the affected units.

The AD imposes several specific duties. The first duty is to inspect the “FASTprop” propeller de-icers within 10 hours of the effective date (22 December 2005) in accordance with paragraphs 2.A(3) through (5) of the Goodrich ASB. The second duty is that if the de-icer fails that inspection, it must be repaired or replaced before further flight (i.e., before the aircraft flies again after the effective date). The third duty is to perform a visual check once per day of operations in accordance with paragraph 2.A(2) of the ASB. The pilot may conduct this check during the daily inspection. If the daily inspection is certified, the visual check is deemed accomplished. The fourth duty is that if the visual check fails the criteria, a defect must be entered in the maintenance release, and a further inspection, repair, or replacement must be carried out before the next flight. The duty to enter a defect in the maintenance release is explicit; the duty to carry out the further action is implicit in the requirement that such action must be done “before the next flight.” The AD also permits a right: the terminating action (removal and replacement with an approved de-icer) ends the recurring duties under the AD for that installation. Operators have a right to choose terminating action at any time, which relieves them from future daily visual checks and the initial 10-hour inspection (though the 10-hour inspection might already have been done). The AD does not explicitly grant a right to petition for an alternative means of compliance or an extension of time, but such rights exist under the general framework of CASR (e.g., regulation 21.050 or similar provisions allowing variations). The source does not mention any right to appeal the AD itself; an affected person could seek judicial review of CASA’s decision to issue the AD, but the grounds would be limited to procedural error or unreasonableness. The duties apply to the “operator” of the aircraft, but the AD does not define that term. In practice, the registered operator bears primary responsibility, but pilots and maintenance organisations also share duties. The duty to conduct the visual check may be delegated to maintenance personnel when available, but the AD expressly allows the pilot to perform it. If maintenance personnel perform the check, the same certification implications apply. Operators have a duty to ensure that the relevant persons are aware of the AD and that compliance is documented. The AD does not specify record-keeping requirements beyond the maintenance release entry for failures. However, under CASR Part 42 (continuing airworthiness), operators must maintain records of AD compliance. Therefore, operators should record the date and result of the initial inspection, the daily visual checks (or rely on daily inspection certification), and any repairs or replacements. The right to terminate the AD by replacement is clear, but operators should ensure the replacement de-icer is indeed “approved” (e.g., has a CASA approved part number or is covered by a supplemental type certificate). The AD does not specify what constitutes an “approved” de-icer; this must be determined from the applicable airworthiness standards. Operators should consult the aircraft type certificate data sheet or call the manufacturer. A potential duty arises for maintenance organisations: if they are asked to perform the terminating action, they must ensure compliance with the ASB’s paragraphs 2.A(2) for the replacement. They also have a duty to use only approved parts. The AD does not create new rights for passengers or crew, but it indirectly provides a safety benefit by reducing the risk of de-icer detachment.

The instrument itself does not prescribe specific penalties. Enforcement of Airworthiness Directives in Australia occurs under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998 (CASR). Generally, operating an aircraft that does not comply with an applicable AD is an offence. Under section 20AA of the Civil Aviation Act 1988, a person must not operate an aircraft in contravention of a prescribed regulation or direction. An AD is a direction issued under the regulations. The maximum penalty for an individual can be up to 50 penalty units (currently $313 per unit, so $15,650) under the Act, plus potential imprisonment for reckless conduct endangering safety. For a body corporate, the penalty can be up to five times the individual penalty. Additionally, CASA may impose administrative sanctions such as suspension or cancellation of an airworthiness certificate, a certificate of registration, or a pilot’s or engineer’s licence. The AD does not mention any margin of tolerance; compliance times are absolute. For example, the initial inspection must be completed within 10 hours of the effective date. If the operator flies the aircraft for 11 hours without performing the inspection, that flight would be in breach. The visual check must be done each day of operations. Missing a single day could constitute non-compliance. Enforcement action is at CASA’s discretion. CASA may issue a “show cause” notice, a direction to ground the aircraft, or initiate prosecution. In practice, minor infringements may result in a written warning or a defect notice, but systematic non-compliance would attract heavier penalties. The AD also has cross-jurisdictional enforcement implications: if an Australian-registered aircraft is flown overseas, the FAA or other national authorities may also enforce the AD or the underlying FAA AD 2005-18-20. Non-compliance could lead to refusal of entry, detention, or enforcement action in a foreign state. The AD imposes a positive obligation to ensure compliance; ignorance of the AD is not a defence. Operators must actively check for new ADs affecting their aircraft. CASA publishes ADs on its website and via other channels. The source document shows CASA’s AD number and effective date; operators are expected to incorporate this into their continuing airworthiness management system. The penalty for non-compliance also includes the potential for civil liability if an accident occurs due to non-compliance: an operator may face negligence claims from injured parties. Insurance policies may exclude cover for non-compliance with mandatory ADs. Therefore, the financial consequences can far exceed the statutory maximum fine. The AD itself does not include a sunset date or a review period; it remains in effect until superseded or withdrawn. The enforcement burden is shared: CASA can audit operators, and maintenance organisations and pilots have a professional duty to refuse to operate or release an aircraft that is not compliant. The AD does not specify who is responsible for ensuring compliance when the aircraft is leased or chartered, but typically the operator named on the certificate of registration bears primary responsibility. Lessors may also impose contractual obligations to comply with all ADs.

The AD interacts with a matrix of aviation safety regulations and international standards. First, the AD references FAA AD 2005-18-20 Amdt 39-14261. This indicates that CASA adopted the same requirements as the US FAA, likely through a bilateral agreement or unilateral recognition. Operators of aircraft that are both Australian and US registered must comply with both directives, which are identical in substance. If an aircraft is imported from the US, it must have complied with the FAA AD before Australian registration. Conversely, an Australian aircraft flying to the US must comply with the FAA AD as a condition of operation. The AD also interacts with CASR Part 42, which deals with continuing airworthiness. Part 42 requires that operators maintain an airworthiness management system that ensures compliance with all applicable ADs. The AD becomes part of the operator’s maintenance schedule. Under CASR Part 145, maintenance organisations must use approved data; the Goodrich ASB becomes approved data by virtue of being referenced in the AD. Part 66 (licensing) requires licensed aircraft maintenance engineers to be familiar with ADs applicable to the aircraft they certify. Part 91 (general operating and flight rules) requires that no person operate an aircraft that is not airworthy; an AD non-compliance would render the aircraft unairworthy. The AD also interacts with the Civil Aviation Act 1988, s 32B (delegation) - the AD was signed by a delegate of CASA. The instrument’s validity depends on proper delegation. The AD does not override other regulatory requirements; it adds to them. For example, if the daily visual check is conducted by a pilot, it must be recorded in the aircraft’s technical log or equivalent, which is required by regulations. The AD does not specify where the visual check result is recorded, but the reference to the “maintenance release” for failures suggests a specific document. Under CASR Part 42, the maintenance release is part of the aircraft’s continuing airworthiness record. The AD also interacts with state and territory laws regarding workplace health and safety; maintenance personnel must ensure they follow safe work practices when performing the inspections. There may be interaction with the Competition and Consumer Act 2010 in relation to approved replacement parts,operators may argue that the AD effectively mandates the use of certain products, which could raise competition concerns, but such claims are unlikely to succeed given the safety justification. The AD interacts with international treaties such as the Chicago Convention, under which Australia must adopt airworthiness standards at least equivalent to ICAO Annex 8. The AD likely aligns with ICAO standards. The AD references the Goodrich ASB, which is a proprietary document. That ASB may itself be subject to intellectual property laws; operators must purchase or obtain the ASB from Goodrich, which imposes a cost. The AD does not require the ASB to be free; it simply mandates compliance with its instructions. This creates an indirect interaction with copyright law: operators must either buy the ASB or rely on the manufacturer to supply it. The AD also interacts with the Defence Act 1903 if the aircraft is operated by the Australian Defence Force. Defence aircraft may be exempt from CASA ADs unless they are agreed. The instrument does not state any exemption. The AD is silent on its interaction with state legislation, but no direct conflict is apparent.

The source document provides no amendment history. It appears to be the original and only version of AD/PROP/6 as issued on 8 November 2005 and effective 22 December 2005. The AD number is 13/2005, suggesting a sequential numbering system for ADs issued in 2005. Without subsequent amendments listed, we cannot determine if the AD has been amended later, superseded, or withdrawn. The absence of amendment history in the source does not guarantee that no amendments exist. ADs are frequently revised to extend compliance times, add or remove part numbers, or change inspection procedures. Operators must check the current CASA AD database to see if any amendments have been issued. The source does not reference any earlier ADs that this one replaces; it is a standalone directive addressing the “FASTprop” de-icer issue. It cross-references FAA AD 2005-18-20, which may have its own amendment history (it is Amdt 39-14261, indicating it is an amendment to the FAR). But for the Australian AD, the only date given is the effective date. The instrument is dated 8 November 2005 (signed by James Coyne, Delegate of CASA) and becomes effective on 22 December 2005. That 44-day gap between signing and effectiveness is common to allow operators to prepare. The AD does not include a review date or sunset clause. Because this is a legislative instrument made under the Civil Aviation Act, it is subject to the Legislation Act 2003, which requires it to be registered on the Federal Register of Legislation and may be subject to disallowance by Parliament, though that is rare for ADs. The source does not indicate whether it was subject to disallowance. To determine the current status, a reader would need to search the current CASA AD listing. In the absence of amendment information, we must assume the AD as written is the only version, and any subsequent changes would be in separate documents. The AD number (13/2005) suggests it is the 13th AD issued in 2005 for propellers (the prefix AD/PROP/6 indicates it is propeller-related). There may be later ADs that supersede or modify it, but they are not part of this source. The deep dive therefore cannot analyse amendment history beyond noting its absence.

The source document contains no references to litigation, court cases, or tribunal decisions. There is no listed case history. This is typical of airworthiness directives; they are rarely challenged directly in court. Challenges to ADs in Australia are uncommon because the standard of judicial review is high: CASA must show that the AD is not irrational or procedurally flawed. The AD’s background does not provide scientific or technical evidence supporting the requirement, but that is not necessary for its validity. The source does not mention any previous enforcement actions or disputes specifically about this AD. However, the underlying FAA AD (2005-18-20) may have been subject to litigation in the US, but that is outside the scope of this analysis. In Australia, if an operator disagreed with the AD, they could seek review under the Administrative Decisions (Judicial Review) Act 1977, but the grounds would be limited. For example, an operator might argue that the compliance time of 10 hours is too short or that the visual check is unnecessary. But the operator would need to show that CASA acted unreasonably. Given that the AD follows the FAA lead and responds to reports of detachment, a court would likely defer to CASA’s expertise. No such litigation is recorded in the source. The AD does not create a private right of action; it is regulatory. However, if a de-icer detaches and causes injury, the AD may be used in civil litigation as evidence of the applicable standard of care. A plaintiff could argue that non-compliance with the AD is negligence per se. But again, no cases are mentioned. The source is purely the instrument itself. Therefore, the litigation history section must state that the provided text contains no litigation history. It would be speculative to invent any. The note “FAA AD 2005-18-20 Amdt 39-14261 refers” might have associated US litigation, but that is not part of this source. For Australian purposes, the litigation history is nil. The practitioner should be aware that ADs are usually complied with without challenge due to the safety imperative and the cost of litigation. However, if an operator is contemplating challenging an AD, the grounds would be narrow and the burden high. The absence of litigation may also indicate that the AD was accepted by the industry without contest. Alternatively, there may have been unpublished enforcement actions. This deep dive cannot go beyond the source.

Several aspects of AD/PROP/6 could trap unwary operators. First, the compliance timeline is staggered and easy to confuse. The initial inspection must be done within 10 hours after the effective date (22 December 2005). That deadline is fixed; if the aircraft flies 11 hours after that date without the inspection, it is in breach. But note that compliance time 1 is “within 10 hours after the effective date” whereas compliance time 2 is “before further flight after the effective date.” That means if the aircraft had already flown before the effective date, it must not fly again until the failed de-icer is addressed. Confusion could arise if the operator schedules the initial inspection after the first flight post-effective date; that might be okay if the inspection is done within 10 hours. But the second compliance time is triggered immediately for any de-icer that fails the first inspection,it must be fixed before the next flight. So if the inspection is done at 9 hours and a de-icer fails, the aircraft cannot fly again until repair or replacement is done. The third compliance time (daily visual check) starts after the first day of operations following the effective date. The AD says “once per day of operations either during the pilot’s first pre-flight inspection of the day or to be accomplished by maintenance personnel when available.” The phrase “when available” may cause operators to think it is optional if maintenance personnel are not available. But the AD is mandatory; the pilot can do it. If the pilot fails to do the visual check, that is non-compliance. The unique provision that certification of the daily inspection implies the visual check has been accomplished is a trap: the pilot must actually perform the visual check, not just certify the daily inspection without looking. The AD does not say the pilot may skip the visual check; it says certification implies the visual check has been accomplished, but only if it actually has been. Another trap is the definition of “approval” for the replacement de-icer in the terminating action. The AD says “replaced with an approved propeller de-icer in accordance with paragraph 2.A(2) of the Accomplishment Instructions.” What constitutes “approved” is not defined in the AD. The operator must determine whether a particular replacement part has the necessary approval from CASA (e.g., via a supplemental type certificate, a CASA approved part number, or an STC). Using an unapproved replacement would not terminate the AD, and the daily visual checks would continue to apply. The operator could inadvertently purchase a replacement that is not approved, thinking the AD is satisfied. Furthermore, the AD’s listing of part numbers is “but not limited to” meaning other “FASTprop” de-icers not explicitly listed may also be affected if they are covered by the FAA AD table. An operator must check Table 1 of FAA AD 2005-18-20 to see if their specific propeller model is listed. The AD says “A list of the propellers that these propeller de-icers may be installed on but not limited to, can be found in Table 1 of FAA AD 2005-18-20.” This cross-reference imposes an additional burden to obtain the FAA AD. Failure to check that table could result in unknowing non-compliance. Another trap: the visual check criteria are not stated; the operator must refer to the Goodrich ASB. If the operator does not have the ASB, they cannot perform the check correctly. The AD does not state where the ASB is available or whether it is free. Also the AD does not specify language; if the ASB is in English, that is fine, but non-native English speakers may misinterpret instructions. The terminating action is removal and replacement with an approved de-icer. However, the AD does not say what happens if the replacement is also a “FASTprop” de-icer but of an approved part number not of the affected series. The terminating action likely requires a different design. An operator might think replacing with another “FASTprop” from an unaffected part number is sufficient, but that would not comply because the terminating action references paragraph 2.A(2) of the ASB, which presumably instructs on replacing with an approved unit (likely a different manufacturer part). The AD’s wording is ambiguous. Finally, the AD does not address aircraft that are not in service, stored, or under maintenance. If the aircraft is not operated for a day, the daily visual check is not required, but the initial 10-hour inspection still applies when the aircraft is brought back into service. The AD also does not address what happens if the de-icer is removed temporarily (e.g., for propeller overhaul); the terminating action would not be triggered unless it is replaced with an approved de-icer. Partial compliance could leave the operator still subject to the AD.

Compliance with AD/PROP/6 requires a structured approach. First, identify whether the operator’s aircraft has any of the listed Goodrich “FASTprop” propeller de-icer part numbers installed. If the aircraft is not equipped with any such de-icer, the AD does not apply. If it is, proceed as follows. Obtain a copy of Goodrich De-icing and Specialty Systems Alert Service Bulletin No. 30-60-00-1, dated 15 November 2004. This document contains the mandatory instructions. Also obtain FAA AD 2005-18-20 Amdt 39-14261 to check Table 1 for the list of propellers the affected de-icers may be on. If the propeller model is listed, the AD applies. If not, it may still apply because the word “but not limited to” means other propellers could host the same de-icers. So treat any installation of the listed de-icer as subject. The first compliance action: within 10 hours after 22 December 2005, perform the inspection required by paragraphs 2.A(3) through (5) of the ASB. This must be done by a person qualified to perform such work (likely a licensed aircraft maintenance engineer). The inspection result must be recorded. If any de-icer fails the inspection, it must be repaired or replaced before further flight, using the same ASB paragraphs. Use only approved repair procedures or approved replacement parts. The terminating action may be taken at this point: remove the “FASTprop” de-icer and replace it with an approved propeller de-icer in accordance with paragraph 2.A(2) of the ASB. If terminating action is taken, no further AD requirements apply to that installation, but the replacement must be approved. If terminating action is not taken, the operator must begin daily visual checks. The operator may assign the visual check to the pilot during the daily inspection, or to maintenance personnel. The visual check must be performed once per day of operations, per paragraph 2.A(2) of the ASB. If the pilot conducts the daily inspection and certifies it, the visual check is deemed accomplished. However, the pilot must actually perform the check. Certifying the daily inspection without doing the visual check would be false certification and a breach. Document the visual check in the aircraft’s technical log or daily inspection record. If the visual check fails the criteria (e.g., the de-icer shows signs of debonding, looseness, or damage), enter a defect in the maintenance release. Then before the next flight, perform the inspection, repair, or replacement as necessary as per paragraph 2.A(2) of the ASB (which also covers the terminating action). Once the failed unit is repaired or replaced with an approved de-icer, the AD is again complied with, but note the terminating action is only accomplished when it is replaced with an approved de-icer, not just repaired. If repaired, the AD continues to apply to that repaired unit. The operator should maintain a log of compliance showing the date the initial inspection was done, the results, any repairs, and the daily visual check records. These records may be examined by CASA during an audit. The operator should also check the CASA website periodically for any amendments to AD/PROP/6 that might change compliance times, add part numbers, or supersede the directive. If the operator intends to terminate the AD permanently, the best course is to remove and replace all affected de-icers with a non-“FASTprop” approved type. This eliminates the daily check burden and the risk of failure. The cost of replacement must be weighed against the ongoing compliance cost. Operators should also consider the impact on aircraft resale value: a “FASTprop” de-icer may be viewed negatively by buyers due to the AD.