Introduction
In aviation, a task card (also called a job card or work card) is a standardized document that breaks down a maintenance task into clear, step-by-step instructions. Each task card is drawn from the aircraft’s approved maintenance data (e.g. the Airbus A320 or A350 Maintenance Manual) and is used on the shop floor to guide the work. A task card typically covers one specific inspection or repair action, specifying what to do and how to do it. In practice, engineers will create a task card by extracting relevant procedures from the manual and arranging them in a concise format. This makes it easier for mechanics to follow complex procedures on aircraft without having to page through the full manual.
Task cards are distinct from work orders. A work order (or maintenance order) is essentially a formal request to perform a maintenance job – it defines the scope of work, the aircraft involved, parts needed, and approval to start. In contrast, a job card (or task card) is the detailed set of instructions for executing that work. In other words, the work order authorizes and identifies the job, while the task/job card tells the technician exactly what actions to perform.
To summarize:
- Work Order: Administrative document authorizing the maintenance task (defining WHAT needs doing, where, and resources required).
- Task Card / Job Card / Work Card: Technical instruction sheets that detail HOW to perform the task, step by step.
These task cards are crucial when maintaining complex motored powered aircraft such as the A320, A330, A350, etc. because they allow maintenance control and quality staff to plan and record each step of inspections and repairs. For example, in an A320 C‑check, the complex inspection of the landing gear or APU might each have its own maintenance task card with checklists and signatures. By design, task cards help track accomplishment of every sub-step and ensure compliance with the OEM’s procedures.
EASA 145.A.45(e) and AMC1 145.A.45(e) – Maintenance Data and Task Cards
EASA Part-145 regulation 145.A.45(e) lays out clear rules for how maintenance data (including task cards) must be handled. Under 145.A.45(e), a maintenance organization “must provide a common work card or worksheet system” for use across its teams. In practice, this means the MRO or operator must adopt a standard task-card format (either paper or electronic) that is used by all maintenance personnel. The rule further requires that the maintenance information from approved manuals be either accurately transcribed onto those task cards or clearly referenced on them. Importantly, complex or long maintenance tasks must be split into clear stages on the task card, so that each portion of the work is tracked and signed off. For example, a lengthy inspection might have separate cards for disassembly, inspection, reassembly, and testing, each with its own completion record.
The corresponding Acceptable Means of Compliance (AMC) provides additional guidance. AMC1 145.A.45(e) emphasizes that different maintenance shops (e.g. airframe vs engine vs component shops) should all use the same task card system, ensuring consistency. It specifies that “the work cards should differentiate and specify, when relevant, disassembly, accomplishment of tasks, reassembly and testing as well as the error-capturing method (e.g. independent inspection)”. In other words, each card should clearly indicate the sequence of steps (tear down, task, build up, test) and how errors or findings are to be recorded. If a task is especially involved, the AMC advises using supplementary worksheets under a main work card to cover every detail.
The AMC require also taskcards directly incorporates human factors into this process. It states that “with reference to point 145.A.65(a), human factors should be taken into account during the development of work cards and worksheets”. This ties the quality of task card design to HF guidelines. Finally, the AMC clarifies that if an operator/CAMO insists on using its own job-card system, the maintenance organization must assess it for compliance with Part-145 requirements. In summary, EASA expects maintenance task cards to faithfully reflect the approved maintenance instructions (or reference them precisely) and to be organized in a way that technicians can use them safely and completely.
Human Factors Principles in Task Card Design
Human factors (HF) have a profound impact on the effectiveness of task cards. Poorly designed cards can lead to errors, misinterpretation, or omissions, whereas well-designed cards support the mechanic’s workflow. EASA’s own guidance insists on HF integration, and industry studies show the difference. For instance, an FAA analysis of task card errors found that 20.8% of cards drafted without human factors considerations contained errors, while task cards that met all HF best-practice guidelines were error-free. This underscores that clarity and consistency in task cards directly improve safety and efficiency.
In practical terms, applying HF principles means formatting and wording task cards for easy comprehension. Best practices include using short, numbered steps; avoiding vague language; and organizing information so that technicians rarely need to flip pages. The FAA guide on maintenance documentation recommends generous white space and brief paragraphs – “the best layouts have considerable white space and short paragraphs” – because cluttered text leads to missed steps. It also advises starting complex procedures with a flowchart, so the mechanic gets an overview before diving into details. Consistent fonts (using mixed case, not ALL CAPS), bullet points for cautions, and logical section headers all aid the reader.
Human factors considerations might include: fatigue and attention limitations (avoid overly long cards), clear identification of the aircraft variant (A320neo vs A320-200, for example), and graphic aids or diagrams for tasks like engine alignment. In all cases, the goal is to make the task card as error-proof as possible. The EASA AMC explicitly links task card layout to HF by saying the design should reflect 145.A.65(a) – the rule addressing human factors in maintenance. In effect, regulations recognize that how the maintenance instructions are presented is as important as the instructions themselves. By following HF guidelines (short steps, highlighting cautions, adding a “reason for request” or “special instructions” box, etc.), organizations can reduce slips and mistakes during maintenance.
Responsibility: CAMO vs Maintenance Organization for Human Factors
Responsibility for HF in task card creation is shared, but in different ways. Part-145 maintenance organizations (MROs) hold primary responsibility for the task cards they issue. By regulation, any task card produced by a Part-145 AMO must comply with 145.A.45(e) and its AMC – meaning the AMO must ensure the card meets all content requirements (work steps, references, inspections) and incorporates human factors design. Put plainly, if the MRO’s engineers are writing or formatting the task card, it is their duty to apply HF principles (clear language, logical sequence, ergonomic layout) to minimize the chance of maintenance error.
On the other hand, the Continuing Airworthiness Management Organization (CAMO) has a broader oversight obligation. EASA CAMO.A.315(e) explicitly requires the CAMO to “ensure that human factors and human performance limitations are taken into account during continuing airworthiness management”. This means the CAMO must consider HF when it creates or approves maintenance planning, scheduling, and any documentation it provides (including task cards it may generate). For example, if an operator’s CAMO is managing the A330 fleet, it needs to set policies that task cards and maintenance instructions account for factors like workload, crew coordination, and error traps.
In practice, this implies both players must coordinate. The MRO cannot ignore HF just because the CAMO laid out a plan, and the CAMO cannot abdicate HF responsibility simply because the AMO writes the cards. EASA’s position is that the Part-145 org ensures HF in the cards it actually produces, while the CAMO ensures HF is built into the overall maintenance management system. This collaboration is especially critical for aircraft like the A320 family or A350, where CAMOs often supply additional maintenance instructions for tasks beyond the OEM AMM. Both entities should communicate: the CAMO can specify HF requirements, and the MRO must verify those are implemented when drafting the jobcards.
Accounting for Human Factors when CAMO Provides Task Cards to MRO
A common scenario is when a CAMO (usually an operator’s in-house CAMO) provides its own task or work card system to a contracted MRO. Whose job is it, then, to ensure those cards respect HF principles? The answer is: ultimately, the Part-145 maintenance organisation performing the work. EASA’s guidance (AMC1 145.A.45(e) point 5) expressly says that if an operator/CAMO requires the use of its work cards, the maintenance organization must assess that system for compliance. In other words, the MRO must treat the CAMO’s cards as it would any maintenance data: verify they are accurate, current, and formatted according to Part-145 requirements (including HF design).
That said, the CAMO also carries responsibility. By CAMO.A.315(e), the CAMO should have already incorporated human factors into any task cards it distributes. However, the final check falls to the Part-145 org. For example, if an operator’s CAMO sends a job card for an A330 engine inspection, the MRO’s quality management system should review it for clarity and completeness (ensuring hazards are highlighted, steps are logical, etc.) before issuing it to engineers. If deficiencies are found, the MRO must treat them as they would any maintenance data error (report and correct them per 145.A.45(c)).
n summary, while the CAMO should design its task cards with HF in mind, the EASA regulations make the MRO ultimately responsible for ensuring any CAMO-supplied task cards meet Part-145 standards. This dual accountability means HF considerations are checked at both the planning (CAMO) level and the execution (AMO) level, reinforcing the goal that every maintenance instruction – whether “traditional” (from the AMM) or operator-originated – is clear, concise, and human-centered.
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