AD/ERJ-170/1 Amdt 3 - Cargo Doors

The central concept is airworthiness directive compliance as a mandatory continuing airworthiness requirement. The directive uses several specific technical and regulatory concepts: cargo door flushness (the visual inspection to ensure the door is aligned with the fuselage skin when closed and locked), interference (between the door handle and the aft edge liner assembly), damage to the lateral roller fitting (a bearing fitting on the fuselage frame that guides the door), and terminating action (the modification that eliminates the need for repetitive inspections). The directive also introduces the concept of approved Minimum Equipment List (MEL) procedures for cargo door inoperative position indication, allowing dispatch under certain conditions before the full inspections are done. The directive relies heavily on references to external technical documents: Embraer Alert Service Bulletin (ASB) No. 170-52-A036 for the inspection of the door surround trim lining and roller fittings; Embraer Service Bulletin No. 170-50-0006 for reworking the aft edge liner assembly; Embraer SB No. 170-52-0041 for relocating the closed indication sensor; Embraer SB No. 170-52-0044 for modifying the lock handle mechanism and replacing roller fittings; and Aircraft Maintenance Manual (AMM) tasks for the operational and functional checks post-modification. The terms flight cycles and flight hours are used as recurrence intervals, which differ: the pre-modification inspection interval is 150 flight cycles (takeoffs and landings), while the post-modification check interval is 6,000 flight hours. The directive is issued by CASA as a delegate of the Civil Aviation Safety Authority, referencing the Brazilian ANAC AD 2007-03-01R1 as the originating authority. The concept of amendment history is part of the directive's own evolution: Amendment 1 introduced terminating action to the compliance for Requirement 1 (the before-departure visual check); Amendment 2 restored inadvertently omitted Requirement 3 text; Amendment 3 is the current version, clarifying applicability (models and serial numbers or production line applicability as per the related ANAC AD) and mandating terminating action to the repetitive inspection.

The primary duty holders are operators of Embraer ERJ-170 series aeroplanes in Australian registered aircraft or foreign aircraft operating in Australia under a CASA permission. Specifically, models affected are ERJ 170-100 LR, -100 STD, -100 SE, -100 SU, -200 LR, -200 STD, and -200 SU. This includes airlines, charter operators, and any entity that conducts flights with these types. The directive also directly affects maintenance organisations that perform the inspections, modifications, and maintenance plan revisions. They must have access to the latest versions of the referenced Embraer service bulletins and AMM tasks, and must ensure that any repairs or replacements use approved parts (e.g., same part number for roller fittings if damage found; new fittings part numbers 170-92569-403 and 170-85452-403 for the terminating modification). The directive imposes obligations on flight crew and dispatch personnel, because Requirement 1 requires a visual flushness check before each departure until the terminating action is done. This affects pre-flight procedures and potentially delays. The directive also affects lessors and aircraft owners who may bear the cost of compliance, especially if aircraft are not operated continuously. The backdated compliance dates (e.g., 10 days after 23 March 2007 for Requirement 2, and 150 flight cycles from 23 March 2007 for Requirement 2.b.(ii)) mean that any operator who acquired an aircraft after those dates must check records to ensure prior compliance, or be liable for non-compliance back to the acquisition date. The directive may also affect manufacturers (Embraer) and ANAC as the source of the original AD, but the legal burden falls on the Australian operator. The Australian Civil Aviation Safety Authority (CASA) is the regulator that enforces the directive. The directive does not mention any exemptions or variations for specific operators; all affected aircraft must comply. The terminating action (Requirements 4 and 5) is mandatory within 5,000 flight cycles after 31 July 2008, which imposes a finite deadline and financial planning requirement for operators.

The key duties are set out in the five numbered requirements in the directive. Requirement 1 imposes a duty to perform a visual inspection of both cargo doors for flushness with the fuselage skin every time before the aircraft departs, until the other requirements are accomplished. This can be done using approved MEL procedures for cargo door inoperative position indication. Requirement 2 imposes duties to: (a) remove and discard cover plates from door surround trim linings per ASB 170-52-A036; (b) perform a detailed visual inspection for interference of the door handle with the aft edge liner assembly, and if interference exists, rework the liner before further flight, and if no interference, rework the liner anyway within 150 flight cycles; (c) remove aft surround trim lining and inspect the lateral roller fitting for damage, and if damage found, replace the fitting with a serviceable bearing of the same part number before further flight, otherwise no immediate action but must repeat inspection. Requirement 3 imposes a repetitive duty to repeat Requirement 2(c) inspections every 150 flight cycles until the terminating action is done. Requirement 4 imposes duties to: (a) relocate the cargo door closed indication sensor per SB 170-52-0041; (b) modify the lock handle mechanism and replace roller fittings with new part numbers per SB 170-52-0044. Requirement 5 imposes a duty to revise the Aircraft Maintenance Plan to include operational and functional checks of the cargo doors per specified AMM tasks at intervals not exceeding 6,000 flight hours. Compliance with Requirements 4 and 5 terminates the repetitive duty under Requirement 3.

The rights of operators are limited. They have the right to use the approved MEL procedures to defer the flushness inspection under Requirement 1 if the cargo door indication system is inoperative, but only until the full inspections and modifications are completed. They have the right to use later ANAC approved revisions of the referenced service bulletins (as stated in each reference: "or later ANAC approved revision"). This means that if Embraer issues a more recent revision and ANAC approves it, the operator may comply with that revised version. There is no stated right to apply for an alternative method of compliance (AMOC) in the text of the AD itself, but under the broader regulatory framework, operators can apply to CASA for an AMOC. The directive does not grant any right to delay compliance beyond the specified timeframes; if damage or interference is found, the duty is "before further flight" in all such cases. The operator's right to operate the aircraft is contingent on compliance.

The directive itself does not state specific penalties, but it is issued under the Civil Aviation Act 1988 (Cth) and the Civil Aviation Regulations (CAR) or Civil Aviation Safety Regulations (CASR). Operating an aircraft in contravention of an airworthiness directive is a serious offence. Under CASR Part 42, the operator is responsible for ensuring the aircraft is airworthy and complies with all applicable airworthiness directives. The maximum penalties for non compliance can be significant: under the Civil Aviation Act, s 20A (as in force at the time), a breach of a condition of an airworthiness certificate or a direction issued under the regulations can attract penalties of up to 200 penalty units for an individual and 1,000 penalty units for a body corporate, or imprisonment for individuals for up to two years. Penalty units in 2008 were $110 each, so up to $22,000 for an individual or $110,000 for a body corporate. More importantly, CASA can take enforcement action including suspension or cancellation of the aircraft's certificate of airworthiness, or the operator's air operator's certificate, effectively grounding the fleet. CASA can also issue infringement notices or seek court orders for compliance. The directive is self enforcing in that maintenance organisations and operators must sign off on compliance as part of the maintenance release. The regulator can conduct audits and ramp inspections. The directive's requirements are precisely defined, leaving little room for interpretation; non compliance is relatively easy to detect if the aircraft's maintenance records are examined. The background notes that ANAC received several reports of aircraft being dispatched with a cargo door unlocked, which led to the directive. Therefore, enforcement is likely to be strict, especially for the before departure check (Requirement 1) and the mandatory repair before further flight when damage or interference is found. The directive also imposes duties that are not one off: the repetitive inspection under Requirement 3 and the maintenance plan check under Requirement 5 are ongoing; failure to perform these at the correct intervals is a continuing breach.

This directive operates within a hierarchy of continuing airworthiness regulation. It is issued by CASA as a delegate, presumably under CASR Part 39 (Airworthiness Directives) or its predecessor under CAR. It adopts an ANAC AD (Brazilian AD 2007-03-01R1) and references Embraer service bulletins and AMM tasks. The directive itself becomes an Australian airworthiness directive and must be incorporated into the operator's approved maintenance program under CASR Part 42 or Part 145. It interacts with the Minimum Equipment List (MEL) requirements: the directive explicitly allows use of approved MEL procedures for cargo door indication inoperative (Requirement 1), meaning the MEL, which is approved by CASA, provides a means to defer rectification under certain conditions. However, the directive's own compliance times (e.g., 10 days to do Requirement 2) may cut across the MEL's deferral periods. The directive also interacts with aircraft maintenance manual procedures: the AMM tasks cited in Requirement 5 are dated 7 December 2007, and must be followed. If Embraer later revises those AMM tasks, the operator may need to use the revised version or obtain CASA approval. The directive interacts with design and certification regulations: the modifications in Requirement 4 (relocating the sensor, modifying handle, replacing roller fittings) are mandatory and must be done per approved data (the Embraer SBs). This may affect the aircraft's type design and require updating of the relevant maintenance data. The directive does not state that it overrides other ADs; but if there are conflicting requirements, operators must seek clarification from CASA. The directive also interacts with foreign airworthiness authority rules: if the aircraft is registered in another country but operated in Australia under a foreign airworthiness certificate, CASA may still enforce this directive through operating permissions. The directive also interacts with contractual obligations between lessors, lessees, and maintenance providers: the cost of compliance and the need to maintain records of compliance will affect lease agreements. Failure to comply could constitute breach of contract or insurance policy conditions.

The document is Amendment 3 of AD/ERJ-170/1, effective 31 July 2008. The background text provides the amendment history: Amendment 1 introduced terminating action to the compliance for Requirement 1. That likely means that before Amendment 1, Requirement 1 (the before departure visual check) had no terminating action and was to be performed indefinitely. Amendment 1 gave a way to end that check by completing Requirements 2 through 5. Amendment 2 restored the text of Requirement 3, which had been inadvertently omitted during an earlier amendment. This suggests a drafting error that could have caused confusion: without Requirement 3, the repetitive inspection of the lateral roller fitting might not have been mandated. Amendment 3 is issued in response to a revision of the related ANAC AD (presumably AD 2007-03-01R1 or a later version). Amendment 3 clarifies the applicability (likely specifying exact serial numbers or production line applicability that were not clear before) and mandates terminating action to the repetitive inspection requirement (i.e., makes Requirements 4 and 5 mandatory to end the 150 flight cycle inspections, rather than optional or alternative). The amendment history indicates that the directive has been updated to tighten requirements and close loopholes. There is no mention of previous versions of the directive itself (e.g., original issue, Amdt 1, Amdt 2). The effective date of this amendment is 31 July 2008, but the compliance dates for many tasks are backdated to 23 March 2007 (the effective date of the original directive or the ANAC AD). This means operators who were not already complying with the original directive had a window to catch up, but for new operators or aircraft imported after 23 March 2007, the compliance periods run from the date of the aircraft's first operation in Australia or the date of the AD's application, which is 23 March 2007. This creates a potential trap: an aircraft that entered service on 1 June 2007 would need to have had Requirement 2 accomplished within 10 days of 23 March 2007, meaning the operator would have had to perform that work before the aircraft even arrived. Therefore, practical compliance required either retroactive application of work or an alternative method of compliance approved by CASA. The amendment history suggests that CASA attempted to align with the ANAC AD and correct omissions.

There is no litigation history recorded in the text of the directive itself, nor is there any reference to court cases. Given the narrow technical nature of this airworthiness directive, any litigation would likely be limited to enforcement actions by CASA against operators for non compliance, or appeals against suspension of certificates. No notable reported decisions are likely. Operators might challenge the retrospectivity or the reasonableness of compliance deadlines, but such challenges are rare in airworthiness directive contexts because the safety justification usually outweighs procedural arguments, and the Civil Aviation Act gives CASA broad powers. The background states that the ANAC received several reports of aircraft being dispatched with a cargo door unlocked, which indicates an immediate safety risk, making it difficult to argue that the directive is disproportionate. If any litigation occurred in Brazil regarding the ANAC AD, that might be relevant but is not mentioned. In Australia, the Civil Aviation Safety Authority has successfully prosecuted operators for failing to comply with airworthiness directives in other cases, so the precedent would support strict liability. There is no indication of any challenge to the validity of this particular directive. If there were litigation, it would likely be before the Administrative Appeals Tribunal regarding an AMOC application or a review of a CASA decision to suspend a certificate. None of this is documented in the source.

Several traps exist for unwary operators. First, retrospective compliance dates: many requirements have compliance times starting from 23 March 2007, even though Amendment 3 was issued in June 2008 and effective 31 July 2008. An operator who purchased an affected aircraft after 23 March 2007 but before 31 July 2008 must check if the required actions were already performed by the previous operator or lessor. If not, the operator is already in breach from the date of purchase. Second, Requirement 2.b.(ii) requires the aft edge liner to be reworked even if no interference is found within 150 flight cycles after 23 March 2007. Many operators might assume that no interference means no action, but the directive mandates the rework regardless. Third, intervals: the pre modification inspection (Requirement 3) is at intervals not exceeding 150 flight cycles, while the post modification check (Requirement 5) is at intervals not exceeding 6,000 flight hours. Mixing flight cycles and flight hours can confuse operators and maintenance planners. The 150 flight cycles limit may be triggered quickly on short haul operations. Fourth, terminating action requires completion of both Requirement 4 (modifications) and Requirement 5 (maintenance plan revision). Doing only the hardware modification without updating the AMP does not terminate the repetitive inspections. Fifth, before further flight triggers: if any interference is found (2.b.(i)) or damage to the roller fitting is found (2.c.(i)), the aircraft cannot be flown again until the rework or replacement is done. This can cause operational disruptions and requires immediate availability of parts and labour. Sixth, MEL reliance: while Requirement 1 allows use of approved MEL procedures for inoperative cargo door indication, this is only applicable until accomplishment of Requirements 2, 3, 4, and 5. Once the terminating action is done, the MEL must be updated to remove the deferral. Also, the MEL procedure might itself have limitations (e.g., MEL may not allow dispatch with the door unlocked but may allow dispatch with an inoperative indicator). Operators must carefully cross reference the MEL with the AD. Seventh, approved revisions: the directive allows use of "later ANAC approved revision" of the SBs and AMM tasks. However, if the revisions are not yet approved by ANAC, the operator cannot use them. Operators must check ANAC's approval status. Eighth, part number replacement: if damage is found on a roller fitting, it must be replaced with a serviceable bearing with the same part number (170-92569-401 or 170-85452-401). Later, the modifications require replacement with new part numbers (170-92569-403 and 170-85452-403). An operator who had earlier replaced a damaged fitting with the old part number must later replace it again with the new number as part of the terminating action.

Compliance must be systematic and documented. The operator should create a compliance plan referencing each requirement and its due date. First, for each affected aircraft, determine the date of first operation in Australia (or the effective date of the original AD, 23 March 2007).

• Immediate (before each departure after 23 March 2007, until Requirements 2,3,4,5 are done): Perform a visual inspection of both cargo doors. Ensure door is flush with fuselage skin when closed, latched and locked. This can be done using approved MEL procedures for inoperative position indication if needed. Record the inspection in the aircraft logbook.

• Within 10 days after 23 March 2007 (or if aircraft acquired later, within 10 days of acquisition): Remove and discard cover plates from door surround trim lining per ASB 170-52-A036. Perform detailed visual inspection of door handle interference with aft edge liner assembly. If interference found, before further flight rework liner per SB 170-50-0006. If no interference, rework liner within 150 flight cycles from 23 March 2007 (or from later acquisition, but note the retroactive date).

• Concurrently, remove aft surround trim lining per ASB 170-52-A036 and inspect lateral roller fitting on both cargo door frames for damage. If damage found, before further flight replace fitting with serviceable bearing same part number (170-92569-401 or 170-85452-401). If no damage, no immediate action.

• Repetitive: Repeat the roller fitting inspection (2.c.) every 150 flight cycles until terminating action is done. Use a tracking system to ensure intervals not exceeded.

• Before 31 July 2008 + 5,000 flight cycles (or earlier if possible): Accomplish the terminating action: (a) relocate cargo door closed indication sensor per SB 170-52-0041; (b) modify lock handle mechanism and replace roller fittings with new part numbers (170-92569-403 and 170-85452-403) per SB 170-52-0044.

• After performing the modifications: Revise the Aircraft Maintenance Plan to include operational and functional checks of the fore and aft cargo doors per AMM tasks 52-31-20-720-801-A/500, 52-31-00-710-801-A/500, 52-32-20-720-801-A/500, and 52-32-00-710-801-A/500, dated 7 Dec 2007, at intervals not exceeding 6,000 flight hours. Ensure the AMP is approved by CASA if required.

• Documentation: Keep all records of inspection findings, repairs, part replacements, and work orders. Record the termination of repetitive inspections in the aircraft records.

• Ongoing: Perform the cargo door operational and functional checks per the revised AMP at intervals not exceeding 6,000 flight hours. Monitor for any new revisions to the SBs or AMM tasks approved by ANAC, as they may be used if more recent.

If the aircraft was not in service on 23 March 2007, the operator should contact CASA to confirm the baseline compliance date; but the directive's wording suggests the original AD's effective date governs. In practice, operators should comply as soon as possible upon acquisition and seek an alternative method of compliance (AMOC) from CASA if the retroactive deadlines cannot be met.