AD/CASA/27 Amdt 2 - Centre Wing Lower Skin

The core concept of this directive is mandatory supplemental structural inspection of a Principal Structural Element designated in the C-212 Supplemental Inspection Procedures document C-212-PV-02-SID as element number 57.212.06. The element is the centre wing lower skin at station Y=1030. The directive establishes that this element has an original inspection threshold of 20,000 landings in the manufacturer's documentation, but the investigated accident aircraft experienced cracking well below that threshold (at 7,300 flight cycles). As a result, operator inspections are now required at significantly lower thresholds. The directive distinguishes two operational contexts: operations other than commercial transport, and commercial transport operations. This distinction affects both the initial inspection thresholds and the repeat intervals. For non commercial operations, the first threshold is 8,000 flight hours or 3,600 landings (or lower if aircraft has already exceeded those) and the repeat interval is 600 flight hours or 250 landings. For commercial transport, the first threshold is 15,000 flight hours or 15,000 landings, with a much longer repeat interval of 4,500 flight hours or 4,500 landings. This differential treatment appears to reflect the lower cycles and less severe load spectra of commercial transport operations compared to low altitude missions that produce more fatigue cycles per flight hour. Another key concept is the layering of inspection procedures. The directive requires three types of inspections for the same area: (a) Non Destructive Inspection per SIP document section 57-10-03; (b) the Complementary inspection procedure from SIP section 57-10-03, sequence 2 as defined in EADS-CASA AOL 212-018 revision 2 annex 1; and (c) a High Frequency Eddy Current inspection as defined in annex 3 of the same AOL. The HFEC inspection is the new addition in Amendment 2. The directive also introduces a grace period for aircraft that already complied with Amendment 1: if the NDI required by Amdt 1 was already accomplished, the HFEC inspection is not required; but if only the NDI was done, the Complementary inspection may also already be done, so the HFEC is waived. The concept of "whichever occurs first" is critical for compliance timing: flight hours and landings are alternative triggers, so operators must track both metrics.

This directive directly affects all Australian registered operators, owners, and maintainers of Model C-212 series aeroplanes. The applicability clause states "All Model C-212 series aircraft" without exception. That includes any variant of the CASA C-212 Aviocar series, regardless of role or modification status. The directive imposes duties on the registered operator or the person responsible for continuing airworthiness. Maintenance organisations that perform the inspections must have certified personnel authorised under Part 66 or equivalent, and must hold an appropriate maintenance organisation approval covering NDT and HFEC procedures. The directive also affects entities that operate aircraft under various regulatory frameworks: commercial air transport operators (e.g., airlines, freight carriers), and operators conducting specialised operations such as maritime patrol, search and rescue, parachuting, surveying, or other low altitude missions. Those in the latter category face tighter inspection intervals, so they are disproportionately affected in terms of compliance cost and aircraft downtime. The directive also imposes obligations on the manufacturer EADS-CASA: operators must send inspection results and any crack or loose rivet reports to EADS-CASA for evaluation. This gives the manufacturer access to fleet wide data on centre wing skin cracking, which may lead to further design changes or service bulletins. The Australian regulator CASA is affected in its role of issuing the directive, monitoring compliance, and potentially taking enforcement action. The directive also references EASA Emergency AD 2007-0108-E, so European operators and regulators are indirectly connected, but the Australian AD stands separately for Australian register aircraft. Any entity that intends to import a C-212 onto the Australian register after the effective date may need to verify compliance with AD/CASA/27 Amdt 2 as part of the airworthiness approval process. The existence of this directive also affects the residual value of C-212 aircraft, as the mandatory inspection burden and the risk of finding cracks can reduce the market attractiveness compared to aircraft not subject to such repeated inspections.

The primary duty is to inspect the centre wing lower skin in accordance with the directive's schedule. The duty arises from the moment an aircraft's accumulated flight hours or landings reach the specified thresholds. The operator must ensure that the inspection is carried out by suitably qualified personnel. If the aircraft already exceeds the threshold at the effective date, the duty is to inspect before further flight. For aircraft approaching the threshold, the duty is to inspect within 200 flight hours or 100 landings of 23 April 2007. After each inspection, the operator must repeat the inspection at the prescribed interval (600 flight hours/250 landings for non commercial, 4,500 flight hours/4,500 landings for commercial). The directive creates a duty to report any crack or loose rivet to EADS-CASA "before further flight." This means that if a defect is found during inspection, the aircraft cannot be operated again until the report is sent and presumably until EADS-CASA provides an evaluation (the directive does not say the aircraft must be grounded until evaluation, but the phrase "before further flight" combined with "a detailed report shall be sent to EADS-CASA for evaluation" implies that any flight thereafter requires that evaluation to be considered). There is also a duty to send all inspection results to EADS-CASA, including negative results (no cracks). The operator has the right to conduct a ferry flight with minimum crew to position the aircraft to where appropriate inspection facilities are located. This right is limited: the aircraft must be ferried "with minimum crew" - likely only flight crew required for safe operation - and the ferry flight is only permitted to position for inspection, not for any other purpose such as revenue service. The directive also confirms that Spain AD 02/88 Revision 3 remains valid, meaning operators have been (and remain) subject to additional inspector requirements beyond this directive. The operator has the right to rely on prior compliance with Amendment 1 or the original AD to avoid repeating some inspections, but the HFEC inspection may still be required unless the earlier NDI already covered it (the directive carefully cross references). The operator does not have the right to postpone the inspection based on operating conditions; the mandatory intervals are fixed. However, the operator could request an alternate means of compliance from CASA under CASR 39.003 or similar, but the directive itself does not offer that option explicitly.

The directive itself does not state specific penalties, but as a CASA airworthiness directive under the Civil Aviation Safety Regulations, non compliance is a breach of the airworthiness requirements for the aircraft. Operating an aircraft that does not comply with an applicable AD is an offence under regulation 42.100 of CASR, or under the equivalent provisions in force in 2007. The Civil Aviation Act 1988 includes penalty provisions for operating an aircraft that is not airworthy. Civil penalties can be substantial: for an individual, up to 250 penalty units (in 2007, a penalty unit was $110, so $27,500); for a body corporate, up to 1,000 penalty units ($110,000). Criminal prosecution is possible for wilful or reckless breaches, with higher penalties including imprisonment. Additionally, CASA can take administrative enforcement action: suspending or cancelling the airworthiness certificate, the Certificate of Registration, or the operator's Air Operator's Certificate. CASA may also issue a direction to ground the aircraft until compliance is achieved. The directive's requirement that any crack or loose rivet be reported to EADS-CASA before further flight means that failure to report, or continuing to operate after detecting a defect, would be an independent breach. The ferry flight permission is conditional on being for inspection positioning; using that permission to fly beyond what is necessary could also be a separate violation. The directive also references EASA Emergency AD 2007-0108-E; if the aircraft is operated in both Australian and European regulatory environments, overlapping enforcement could occur. Australian enforcement action can be taken against the registered operator regardless of where the aircraft is physically located. CASA has a range of discretion: it can issue a warning, a direction, seek an enforceable undertaking, or pursue court action. The presence of a confirmed accident potentially linked to centre wing skin cracking makes it likely that CASA will treat non compliance seriously. Operators should also be aware that falsifying inspection records or results could lead to charges under the Criminal Code for fraud or false documentation.

This directive exists within the framework of the Civil Aviation Safety Regulations, specifically Part 39 (Airworthiness Directives). It is an amendment to an existing AD; the original AD/CASA/27 and Amdt 1 remain relevant for prior compliance. The directive explicitly states that Spain AD 02/88 Revision 3 (CASA's reference AD/CASA/1 Amdt 5) remains valid and relevant inspections must be performed in addition to the requirements of this directive. That means operators have overlapping mandatory inspection regimes: the Spanish AD likely covers different structural elements or thresholds. The directive also references EASA Emergency AD 2007-0108-E. While the Australian directive is a separate instrument, the EASA AD may be applicable to aircraft that also hold an EASA type certificate. For Australian registered aircraft that are also validated in Europe, both ADs must be complied with, but since the Australian AD largely mirrors the EASA AD, compliance with one may satisfy the other except for national procedural requirements. The directive invokes the manufacturer's Supplemental Inspection Procedures (SIP) documents: C-212-PV-02-SIP and C-212-PV-01-SIP. These are non regulatory documents but are made mandatory through the directive. The directive also references EADS-CASA AOL 212-018, revision 2, which contain the specific inspection procedures for the Complementary and HFEC inspections. Operators must ensure they hold those documents at the applicable revision level. The directive mentions a ferry flight permit; that interacts with normal flight operation regulations (CASR Part 91 or 121/135 as applicable). The ferry flight must be conducted under the relevant operational rules, and the "minimum crew" requirement may impose additional conditions on who may fly. The reporting requirement to EADS-CASA engages contract law between operator and manufacturer, but the directive makes it a regulatory duty. Additionally, the reporting of defects may intersect with Part 21 or Part 145 requirements regarding mandatory defect reporting to CASA. The directive does not replace those obligations; it supplements them. The directive's effective date is 23 April 2007; operators must also comply with any subsequent amendments or superseding directives.

AD/CASA/27 was originally issued by CASA at some earlier date (not specified in this text). Amendment 1 revised the inspection procedure and extended the applicability to aircraft not previously covered. The current document is Amendment 2, signed on 19 April 2007 and effective 23 April 2007. The background explains that Amendment 2 responds to a new EASA AD (2007-0108-E) which introduced an HFEC procedure as an additional inspection to detect cracks with higher reliability. Thus Amendment 2 adds the HFEC requirement while retaining the existing NDI and Complementary inspection requirements from earlier amendments. The amendment also updates cross references to EADS-CASA AOL 212-018 revision 2 (20 March 2007). The directive does not revoke any earlier AD or amendment; it layers additional requirements on top. For aircraft that already complied with Amdt 1, the HFEC inspection may be waived if the earlier NDI was accomplished (but careful parsing: the directive says the HFEC is required "unless the non destructive inspections required by AD/CASA/27 Amdt 1 are already accomplished" - that likely means the NDI and Complementary inspections from Amdt 1, though the wording is ambiguous; the operator must confirm). The amendment history is not exhaustive in the document, but it shows a progression from original detection of cracks on a high time aircraft, to amended procedures, to addition of HFEC. The existence of multiple amendments suggests that the structural issue is persistent and that CASA is adapting to evolving technical data from EADS-CASA. The directive does not indicate whether any future amendments are anticipated. Operators should monitor CASA's website for further amendments or repeal. Since the directive is from 2007, there may be later amendments not provided in this text; that is a risk for reliance on this document alone.

The source text provides no litigation history. No court cases, tribunal decisions, or administrative review matters are mentioned. The directive itself is a legislative instrument; while it could theoretically be challenged in the Administrative Appeals Tribunal or Federal Court on grounds of procedural error or unreasonableness, no such challenges are recorded in the source. The absence of litigation history does not mean none exists; it only means the document before the reader does not discuss it. Practitioners should independently check legal databases for any decisions relating to CASA airworthiness directives generally or C-212 structural issues specifically. Given that the directive responds to an accident investigation, there may be related proceedings in other jurisdictions (e.g., the accident investigation board reports, or civil litigation against the manufacturer). Those are outside the scope of this source. For Australian purposes, the directive has been in effect for over 17 years, and there is no indication that it has been suspended or set aside by a court. Operators should treat it as fully enforceable. The lack of litigation may also indicate that compliance costs have been absorbed without dispute, or that the directive's mandatory nature discourages challenge. However, if an operator believes the directive imposes an unreasonable burden, the appropriate avenue is to request an alternate means of compliance from CASA, not to ignore the AD.

Several traps await unwary operators. First, the inspection thresholds differ sharply between the two operational categories, but the classification of an aircraft's operations may change over time. An aircraft that moves from commercial transport to non commercial operations (e.g., sold to a patrol operator) will then face much shorter repeat intervals. The operator must reassess the aircraft's operational history and adjust compliance accordingly. Second, the directive uses "flight hours or landings, whichever occurs first" for both initial and repeat intervals. Operators tracking only flight hours may miss the landing limit, particularly for aircraft that do many short flights. A C-212 used for parachute operations might accumulate many landings relative to flight hours. Third, the directive's wording on prior compliance is intricate: for aircraft that already complied with the "non destructive inspections required by AD/CASA/27 Amdt 1," the HFEC inspection is not required. But what exactly were those NDTs required by Amdt 1? The text of Amdt 1 is not provided, so operators must check their records. It may be that Amdt 1 required only the NDI per SIP, not the Complementary inspection. The current directive then separately requires the Complementary inspection for those who did not do it in Amdt 1. Thus an operator who thought they were compliant with Amdt 1 may still need to do both Complementary and HFEC inspections. Fourth, the ferry flight permission appears only for positioning to appropriate inspection facilities. It does not authorise a ferry after finding a crack; if a crack is detected, the aircraft must be repaired or evaluated before any flight, including ferry. The directive says "if a crack or loose rivet is detected during any inspection, before further flight, a detailed report shall be sent to EADS-CASA for evaluation." It does not explicitly say the aircraft is grounded, but the practical effect is strong - without evaluation, the airworthiness is uncertain. Fifth, the directive requires that "the results of all inspections shall be sent to EADS-CASA." This includes negative results, and there is no time limit specified. Operators might neglect this administrative step and then be non compliant. Sixth, the directive does not specify what happens if EADS-CASA does not respond to a crack report. The operator may be in a holding pattern. Seventh, the directive says Spain AD 02/88 Revision 3 remains valid; operators must have that original AD and comply with its inspections too, which may overlap or require separate thresholds. Eighth, the compliance times for initial inspections for aircraft not yet at threshold are "within 200 flight hours or 100 landings after 23 April 2007, whichever occurs first." That clock started immediately.

Compliance should be approached methodically. Step one: determine the aircraft's exact flight hours and landings as at 22 April 2007 (the day before effective date). Also identify the aircraft's operational role: is it currently used for commercial transport or for other operations? If the aircraft changes role later, reassess. Step two: if the aircraft exceeds the applicable threshold (8,000 hours or 3,600 landings for non commercial; 15,000 hours or 15,000 landings for commercial), the inspection is due before further flight. If not yet at threshold but above 5,600/2,400 (non commercial) or 10,000/10,000 (commercial), the inspection must be done within the next 200 flight hours or 100 landings. Step three: obtain the required documents: C-212 Supplemental Inspection Procedures documents C-212-PV-01-SIP and C-212-PV-02-SIP, and EADS-CASA AOL 212-018 revision 2 dated 20 March 2007. These contain the NDI, Complementary, and HFEC inspection procedures. Step four: arrange for a suitably certified NDT facility with capability in eddy current testing (including HFEC). The personnel must be qualified to the required standards (e.g., ASNT Level II or III, or CASR Part 66 with appropriate NDT rating). Step five: perform the inspections in order: first the NDI per SIP Section 57-10-03, then the Complementary inspection per AOL annex 1, then the HFEC per annex 3. Ensure all steps are documented. If the aircraft already complied with Amdt 1 NDI, the HFEC may be waived, but check carefully. Step six: if any crack or loose rivet is detected, immediately cease flight operations, send a detailed report to EADS-CASA (contact details should be in the AOL), and await evaluation before further flight. If no defects found, proceed to step seven. Step seven: send all inspection results to EADS-CASA, including negative findings. Keep copies on file. Step eight: schedule the next inspection based on the repeat interval: for non commercial, within 600 flight hours or 250 landings after the first inspection; for commercial, within 4,500 flight hours or 4,500 landings. Maintain a tracking system that monitors both metrics. Step nine: also comply with Spain AD 02/88 Revision 3 inspections; confirm they are current. Step ten: if the aircraft is to be ferried for inspection, ensure it is with minimum crew only, and conduct the ferry under the appropriate operational rules. Keep a record of the ferry justification. Step eleven: consider requesting an alternate means of compliance from CASA if the prescribed procedure is impractical (e.g., if the HFEC cannot be performed at a local facility). Such request should include data supporting equivalent safety. Step twelve: maintain a continuous log of compliance with this directive as part of the aircraft's continuing airworthiness records.