AD/CESSNA 208/21 Amdt 1 - Low Airspeed Awareness System

Low Airspeed Awareness System
The LSA system is a device or function that alerts the flight crew when the aeroplane approaches an unsafe low airspeed during flight in icing conditions. Its purpose is to prevent loss of control due to aerodynamic stall while the airframe is contaminated with ice. The directive itself does not prescribe the technical specifications of the LSA; it relies on the referenced Cessna Service Bulletin CAB06-11 and Service Kit SK208-171 dated 9 October 2006, which provide installation instructions. The system becomes mandatory because the AFM supplement requirement 1 incorporates the LSA as a necessary element for operating the aeroplane in known icing.

AFM/POH Supplement S1 “Known Icing Equipment”
This supplement is a document that becomes part of the approved flight manual. Once incorporated, it sets out the operating limitations, procedures, and performance data for flight in icing conditions. The supplement also mandates the installation of a functioning LSA system. Four specific document numbers are listed, one for each combination of model (208 or 208B) and engine power (600 SHP or 675 SHP). The directive allows later FAA-approved revisions that incorporate the same information, providing some flexibility if Cessna issues updates.

Optional Cessna Flight into Known Icing Equipment Package
Applicability is limited to aeroplanes that are equipped with this optional package. This package includes airframe de-icing pneumatic boots and other components that allow the aeroplane to be operated in known or forecast icing conditions. Aeroplanes that are placarded against flight in icing are outside the scope of this directive. The original wording was broader; this amendment tightens the applicability to only those aeroplanes that already have the package and are not currently prohibited from icing flight.

Placard Removal and Temporary Revision Removal
Requirements 2 and 3 are clean-up actions. The earlier directive AD/CESSNA 208/20 Amdt 1 required installation of placards and insertion of temporary revisions to the AFM. Once the new supplement is in place, those interim measures become redundant and must be removed to avoid conflicting information in the flight manual. This reduces confusion for pilots.

Compliance Timing
Requirement 1 must be met within 90 days after the effective date (5 July 2007), giving operators until around 3 October 2007. Requirements 2 and 3 are triggered immediately after Requirement 1 is completed. This sequenced approach means the placard removal and clean-up cannot be done earlier; they must follow the supplement installation.

Private Pilot Licence Holder Authority
Note 2 permits an owner or operator who holds at least a Private Pilot Licence to perform the AFM and POH changes themselves. This is a notable delegation of what might otherwise be considered maintenance or engineering work. The condition is that they must make an entry in the aircraft records showing compliance. This does not extend to the physical installation of the LSA system, which is not a task under this directive but rather under the supplement’s requirements.

Origin and Harmonisation
The directive derives from FAA AD 2007-10-15 and a series of earlier FAA actions. The background states that Cessna developed the LSA system after the initial FAA AD was issued. The amendment reflects CASA’s adoption of the FAA’s clarification to limit applicability and to avoid a redundant LSA installation requirement.

The directive primarily affects the owners and operators of Cessna Model 208 and 208B aeroplanes that are fitted with the optional Cessna flight into known icing equipment package. These aeroplanes typically operate in charter, freight, utility, and regional passenger services where flight in icing conditions is a routine or seasonal risk. The operational scope includes aeroplanes powered by Pratt & Whitney Canada PT6A-114 (600 SHP) or PT6A-114A (675 SHP) turboprop engines, or any FAA-approved equivalent engine of equal or higher horsepower. Aeroplanes that are currently placarded against flight in known or forecast icing are excluded.

Maintenance organisations and licensed aircraft engineers are affected because the incorporation of the AFM supplement may require an aircraft records entry if the work is performed by an engineer rather than by the owner-pilot. More significantly, the LSA system installation, which is mandated by the supplement itself, will require engineering labour, parts procurement, and possible aircraft downtime. The owner or operator bears the cost of the LSA system hardware, the service kit, and the labour for installation and testing.

Flight crew, particularly pilots of Cessna Caravans (the 208 series), are affected because they must be familiar with the new supplement, the LSA system’s operation, and any changes to normal and emergency procedures for icing flight. The removal of old placards and temporary revisions reduces the cognitive load of managing multiple interim AFM pages.

The Civil Aviation Safety Authority is indirectly affected as the issuer and enforcer of the directive. The directive also affects Cessna Aircraft Company as the manufacturer that produced the S1 supplements and service information. The FAA is referenced as the originating authority, so operators who also fly in the United States may need to comply with a near-identical FAA AD.

The directive does not affect aeroplanes that lack the known icing package, including those that are mechanically identical but have never been equipped with boots or the optional package. It also does not affect other models in the Cessna single-engine turboprop line, such as the Grand Caravan EX or other variants that are not 208 or 208B, unless they are covered by separate directives.

Duty to Incorporate Supplement
The primary duty is on the owner or operator of each affected aeroplane to incorporate the correct FAA-approved S1 supplement into the AFM or POH. This must be done within 90 days after 5 July 2007. The choice of supplement must match the model and engine combination. If operators delay beyond the compliance deadline, the aeroplane is in breach of the directive and may not be airworthy for operations in known icing.

Duty to Remove Placards and Temporary Revisions
Immediately after the supplement is incorporated, the placards installed under the earlier directive must be removed. Similarly, any temporary revisions or amendments to the AFM that were inserted under AD/CESSNA 208/20 Amdt 1 must be removed. This ensures only current, permanent AFM content remains.

Duty to Make Aircraft Records Entry
When an owner or operator with at least a Private Pilot Licence performs the AFM changes themselves, they must make a record entry in the aircraft logbook or equivalent records showing compliance with Requirements 1 and 3. This entry is akin to a maintenance release and documents that the directive has been accomplished. If an engineer performs the changes, the usual maintenance release procedures apply.

Right to Perform Changes (Private Pilot Licence Holder)
Note 2 grants a right to the owner or operator who holds a Private Pilot Licence or higher to accomplish the AFM and POH changes without the involvement of a certified aircraft maintenance engineer. This is a limited delegation; it covers only the document changes, not the installation of the LSA system or any airframe modification. The right is conditional on making the required record entry.

Right to Use Later FAA-Approved Revisions
The directive expressly permits the use of later FAA-approved revisions of the S1 supplement that incorporate the same information. This allows operators who have a newer version of the supplement to comply without seeking a separate CASA approval for the revision. This reduces administrative burden and helps maintain trans-Tasman or US-Australia operational consistency.

Right to Reference the FAA AD
The directive acknowledges FAA AD 2007-10-15 as the basis. This may assist operators who already comply with the FAA AD to demonstrate equivalent compliance with the CASA directive, though they must still ensure the specific CASA requirements (such as recordkeeping) are met.

Duty to Cease Reliance on Earlier Directive
The earlier AD/CESSNA 208/20 Amdt 1 will be cancelled once the compliance period for this directive has passed. Operators cannot rely on that old directive for continued operations; they must transition to the new supplement regime.

The directive itself does not set out specific penalties. However, it is issued under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. Non-compliance with an airworthiness directive is a serious breach of airworthiness obligations. It can result in the aeroplane being deemed unairworthy. Continued operation of a non-compliant aircraft in icing conditions may constitute a violation of operating limitations and could attract enforcement action by CASA.

Potential enforcement outcomes include the issuance of a direction to ground the aircraft, a fine, or licence action against the operator or pilot. Under the Civil Aviation Act, civil penalties for operating an aircraft not in an airworthy condition can be substantial. The Act provides for penalties up to a certain number of penalty units, which are indexed over time. While this directive dates from 2007, the principle remains: each day of non-compliance could be treated as a separate offence.

Additionally, if an incident or accident occurs involving a Cessna 208 that had not complied with the LSA system requirement, the lack of compliance would likely be cited as a contributing factor, potentially exposing the operator to civil liability or regulatory sanctions. Insurance policies may exclude coverage for losses arising from operation in breach of an airworthiness directive.

The enforcement risk is concentrated in the first few months after the effective date. CASA and its delegates may conduct ramp checks or review aircraft records. If the AFM shows the old placards or temporary revisions still present, or if the supplement is missing, that is prima facie evidence of non-compliance. The directive’s note that a Private Pilot Licence holder can perform the AFM changes might reduce engineering costs, but it does not reduce enforcement risk if the record entry is omitted.

The directive’s cross-reference to FAA AD 2007-10-15 means that operators flying also under FAA jurisdiction could face dual enforcement if they comply with the CASA directive but not the FAA version, or vice versa. However, the requirements are substantively identical.

This directive supersedes parts of AD/CESSNA 208/20 Amdt 1. The background states that the earlier directive will be cancelled once the compliance period of this directive has passed. Operators should not continue to operate under the old placards and temporary revisions after the supplement is incorporated. There is a transition period of 90 days during which both sets of requirements may exist on different aircraft, but for a given aircraft, the requirements of this directive replace the earlier ones.

The directive harmonises with FAA AD 2007-10-15 Amdt 39-15056. This is explicitly referenced in Note 3. For operators who hold both an Australian Certificate of Registration and a US airworthiness certificate, compliance with either directive does not automatically satisfy the other; but because the CASA directive mirrors the FAA AD, the same engineering actions will usually constitute compliance with both. Operators should confirm that the specific Cessna document numbers and revision dates are identical. The directive allows later FAA-approved revisions, which reduces divergence.

The directive interacts with the broader airworthiness regulatory framework under the Civil Aviation Safety Regulations. Specifically, regulations covering airworthiness directives (Part 39 of the CASR equivalent) require mandatory compliance. The directive also interacts with the regulations governing flight manual content and aircraft records. CASR Part 43 deals with maintenance, but the directive’s Note 2 carves out a limited self-help allowance for owners with a Private Pilot Licence to change the manual, which is a relaxation of the usual rule that licensed engineers perform such tasks. This interaction means that for the AFM change only, the normal maintenance requirements are set aside.

The directive also interacts with the original type certificate data sheet for the Cessna 208 series. The pneumatically de-iced aeroplanes are covered by specific type design approval. The LSA system installation is done under Cessna service bulletin and service kit, which may be an approved data for minor modification. The supplement itself becomes part of the approved flight manual, which is a required document for airworthiness.

If an aeroplane is operated in icing conditions outside Australia, the operator must also comply with the airworthiness directives of the state of registry. This directive does not override foreign requirements.

The directive has no direct interaction with tax law, contract law, or tort law, but non-compliance could trigger contractual consequences under lease or charter agreements that require the aircraft to be kept in an airworthy condition.

AD/CESSNA 208/21 was originally issued with an effective date of 5 July 2007. The original issue required the incorporation of the new S1 AFM supplement and also required the separate installation of a low airspeed awareness system. It also maintained the temporary retention of the requirements from AD/CESSNA 208/20 Amdt 1 until the new supplement was incorporated. The original issue was based on FAA AD 2007-10-15.

This amendment (Amdt 1) was signed on 19 June 2007 and became effective on the same date as the original issue, 5 July 2007. The amendment is therefore simultaneous with the original; the practical effect is that the directive as published incorporates the amendment from its commencement. The amendment makes two changes. First, it clarifies the applicability: the directive now applies only to aeroplanes equipped with the optional Cessna flight into known icing equipment package. This narrows the scope from the original wording, which could have been read more broadly. Second, it removes the requirement to install the LSA system as a separate directive requirement. The background explains that this is because the AFM supplement S1 itself already requires the installation of a functioning LSA system. The amendment therefore avoids duplication and potential confusion over which requirement takes precedence.

The amendment also cancels AD/CESSNA 208/20 Amdt 1 after the compliance period of this directive has passed. That earlier directive had required placard installation and temporary AFM revisions. Once the supplement is incorporated and the compliance date reached, those earlier actions are no longer valid.

The amendment history shows a progression from an interim fix (AD 208/20) to a more permanent solution involving redesigned documentation and hardware. The shift from placard-based warnings to an electronic LSA system reflects the manufacturer’s development of a technical solution. The amendment also shows CASA responding to FAA advice to correct an overly broad applicability statement.

No further amendments beyond Amdt 1 are recorded in this source. Operators should check CASA’s current register for any later amendments that may have been issued since 2007, as this source is the directive text as of its issuance.

This source does not mention any litigation history. There are no references to court cases, tribunal decisions, or administrative appeals relating to AD/CESSNA 208/21 Amdt 1. The directive was issued as a routine airworthiness action under delegated authority. It is possible that compliance disputes arose after 2007, but the source text does not record them. Litigation concerning similar CASA airworthiness directives generally arises rarely and only in cases of challenging the scientific basis or the authority of the delegate. No such challenge is noted for this directive.

In the broader context, the FAA AD that forms the basis of this directive, AD 2007-10-15, may have been subject to petitions for reconsideration or legal challenge in the United States, but that is outside the scope of this Australian directive. The Australian source does not import those challenges.

Therefore, for the purposes of this deep dive, the litigation history under this directive is blank. Practitioners should not infer that compliance can be delayed or avoided on account of any litigation; the directive is legally effective and enforceable as written.

The compliance timing is a potential trap. Requirement 1 must be accomplished within 90 days after the effective date of this Directive. The effective date is 5 July 2007, so the deadline is 3 October 2007. However, an operator who reads only the original issue of the directive (if they have an earlier print) may not see the amendment. Since the amendment became effective the same day as the original, the directive as enforced is the amended version. Operators relying on a pre-amendment copy might attempt to comply by installing an LSA system separately or might apply a broader applicability. The safest course is to obtain the official CASA document showing the amendment.

The directive does not itself mandate the installation of the LSA system. The requirement to install the LSA flows from the AFM supplement. If an operator incorporates the supplement but does not install the LSA system, the aeroplane would not be in compliance with the supplement’s limitations, which are part of the approved flight manual. That could render the aeroplane unairworthy for flight in icing. The directive’s Note 1 states that the supplements require the installation of an LSA system. So the LSA is not optional; it is a deferred condition of compliance.

The ability of a Private Pilot Licence holder to perform the AFM changes (Note 2) only covers the document change, not the LSA installation or any other maintenance. An owner who interprets this note as allowing them to install the LSA system themselves would be in error. The LSA installation must be accomplished by appropriately qualified maintenance personnel using the Cessna service kit instructions.

Operators must remove the old placards and temporary revisions immediately after incorporating the supplement. Failure to remove them could lead to conflicting AFM instructions and confusion. An operator who incorporates the supplement but leaves the old placards in place is still non-compliant with Requirement 2.

The cancellation of AD/CESSNA 208/20 Amdt 1 is not immediate. It happens only after the compliance period of this directive has passed. There is a window during which the old directive is still technically in effect, but its requirements are being replaced. Operators should not continue to use the old placards after the new supplement is in place.

The directive applies to aeroplanes equipped with the optional known icing package “which are not currently prohibited from flight in known or forecast icing.” If an aeroplane was later placarded against icing due to a defect, it may fall outside the applicability, but only while that placard remains. If the defect is fixed and the placard removed, the directive applies again. This creates a moving target for compliance tracking.

The reference to “FAA-approved engine of equivalent or higher horsepower” means that engine substitutions approved by the FAA (e.g., a higher horsepower STC) are covered, but the operator must ensure the correct supplement is chosen. Using the wrong supplement for the engine could invalidate compliance.

Identify affected aeroplanes. Determine whether the Cessna 208 or 208B is equipped with the optional Cessna flight into known icing equipment package, including pneumatic de-icing boots. Check that the aeroplane is not currently placarded against flight in known or forecast icing. Note the engine model: PT6A-114 (600 SHP) or PT6A-114A (675 SHP) or an FAA-approved equivalent.

Select the correct FAA-approved S1 AFM supplement. For Model 208 with 675 SHP engine: D1352-S1-10. For Model 208 with 600 SHP: D1307-S1-09. For Model 208B with 675 SHP: D1329-S1-10. For Model 208B with 600 SHP: D1309-S1-10. If a later FAA-approved revision exists that incorporates the same information, it may be used. Obtain the supplement document from Cessna or an approved distributor.

Incorporate the supplement into the aeroplane’s AFM or POH. This can be done by the owner or operator holding at least a Private Pilot Licence, or by a maintenance organisation. The method is as per the supplement’s instructions - typically, insert the supplement pages into the manual and update the list of effective pages. If a PPL holder does the work, they must make an entry in the aircraft records stating compliance with Requirement 1 and Requirement 3. The entry should reference this directive number and the supplement document number and date.

Immediately after the supplement is incorporated, remove the placards that were installed per AD/CESSNA 208/20 Amdt 1 Requirement 2.c. Also remove any temporary revisions and amendments to the AFM that were inserted under that earlier directive. Ensure no obsolete pages remain in the manual. Check that the manual contains no conflicting information about known icing operations.

The supplement itself requires installation of a low airspeed awareness system. This is not a direct requirement of the directive, but it becomes mandatory through the supplement. The operator must arrange for the installation of an LSA system per Cessna Service Bulletin CAB06-11 and Service Kit SK208-171 dated 9 October 2006, or later FAA-approved revisions. This work must be performed by a licensed aircraft maintenance engineer or equivalent, as it involves wiring, sensors, and possibly cockpit indicator integration. The installation must be recorded in the aircraft maintenance log.

After all actions are completed, verify that the aeroplane’s records document compliance with the directive. The aircraft should be airworthy for flight in known icing only if the LSA system is functional and the supplement is in place. The earlier directive AD/CESSNA 208/20 Amdt 1 will be automatically cancelled after the compliance period, so no further action is needed regarding it.

Operators should keep a copy of the directive and the supplement with the aircraft records for reference during audits or ramp checks. For aeroplanes operating under a continuing airworthiness management organisation, the responsible manager should schedule the supplement incorporation and LSA installation within the 90-day window and update the maintenance plan accordingly.