EASA Module 16 common mistakes
EASA Module 16 · Understand the traps and how to avoid them.
Confusing the role of Part-66 with Part-147 and answering that a Part-147 organisation issues the aircraft maintenance licence, rather than only providing the basic training and examination that leads to a licence application handled through the competent authority.
The three approval types (Part-66, Part-M, Part-145) are studied as a block and candidates memorise 'who does what' as a list of names without mapping each to its actual legal function; the training organisation is the most visible body in a candidate's own experience, so its role gets over-extended.
What to do instead
Build a one-line function statement for each regulation and test yourself on it: Part-66 = licensing requirements for the certifying staff; Part-147 = approval of training organisations delivering basic training and examinations; Part-145 = approval of maintenance organisations; Part-M = continuing airworthiness requirements for the aircraft. For every question, first ask 'is this about a person, a training school, a maintenance organisation, or the aircraft?' and only then answer.
Treating the Part-M subparts as interchangeable, for example stating that an airworthiness review is performed under the same subpart as the maintenance programme, or that the continuing airworthiness management organisation's responsibilities sit in the same subpart as the airworthiness review signature privilege.
Subpart letters (C, G, I, etc.) are abstract labels with no intrinsic meaning, and candidates revise them by reading them in sequence rather than by attaching a concrete task to each letter. Under exam pressure the letters blur together.
What to do instead
Create a task-to-subpart table and rehearse it aloud, not by re-reading: which subpart covers the maintenance programme, which covers the continuing airworthiness management organisation, which covers the airworthiness review, which covers the permit to fly. Anchor each letter to one memorable phrase and re-derive the answer from the task described in the stem rather than from the letter you half-remember.
Assuming that because an aircraft is maintained by a Part-145 organisation, the operator has no continuing airworthiness obligations, and answering that the maintenance organisation owns the airworthiness of the aircraft.
Candidates conflate the physical act of maintenance with the legal responsibility for continuing airworthiness. The distinction between the organisation that performs maintenance and the person or organisation responsible for managing continuing airworthiness is a subtle split that is easy to blur when the question is phrased around a real scenario.
What to do instead
Fix the principle in one sentence: maintenance is performed by an approved maintenance organisation, but continuing airworthiness is managed by the operator or owner (or a continuing airworthiness management organisation on their behalf), and the aircraft's airworthiness is not transferred by handing it to a workshop. Practise scenario questions by asking 'who is legally accountable for the aircraft remaining airworthy?' before considering who holds the tooling.
Answering questions about certifying staff privileges by quoting a general rule without checking the specific category, type rating, or authorisation condition described in the stem, for example granting a B1 licence holder authority to certify avionics system work.
The privileges of categories A, B1, B2 and C overlap in the candidate's mental model because they are learned as a table of letters; in a scenario the stem deliberately describes work at the boundary between categories, and the candidate answers from the general impression that a licence covers 'the aircraft'.
What to do instead
Learn the categories by the system they cover, not by rank: mechanical and structural work for B1, avionics and electrical systems for B2, and the release of the aircraft after base maintenance for C, with the A category limited to defined tasks. For each scenario, name the system involved first, then name the category that covers it, and only then decide whether the authorisation described actually extends to that task.
Treating the maintenance programme as a fixed document that cannot be varied, and rejecting answers involving escalation, deviation or approved variation because the candidate believes only the type certificate holder's original schedule may be used.
Candidates learn the maintenance programme as a requirement to be complied with and do not study the flexibility mechanisms, so any answer proposing a change feels like a violation of the rules. This is a knowledge gap disguised as caution.
What to do instead
Study the programme as a living document with defined change routes: initial programme based on the type certificate holder's recommendations, approved by the competent authority, with provision for variations and for escalation of intervals where the applicable rules allow. When a question describes a proposed change, ask whether the described route follows the approval process rather than assuming change equals non-compliance.
Confusing a finding of unairworthiness with a finding that affects only the maintenance programme or documentation, and answering that any finding immediately grounds the aircraft without considering the category and the corrective action route.
Airworthiness findings are taught alongside defect reporting, and the candidate collapses the two into a single 'bad news means stop flying' reflex. The exam often tests the graded response, and the reflex produces the wrong answer on questions about deferred items and documentation findings.
What to do instead
Separate the concepts explicitly: an airworthiness finding concerns compliance with the type design and airworthiness requirements, a defect or occurrence is reportable under the occurrence reporting system, and a documentation finding is corrected through the quality system. Learn what each triggers and who decides, then answer from the category named in the stem rather than from a general sense of severity.
Mixing up the occurrence reporting obligation with the maintenance error reporting or the internal quality reporting route, and answering that a serious incident must be reported only to the maintenance organisation's quality manager.
Both routes exist inside the same organisation and both involve writing a report, so candidates remember 'you report it internally' and stop there, missing the external reporting duty to the competent authority or investigation body within the defined time frame.
What to do instead
Memorise the two-track rule: internal reporting to the organisation, and external reporting to the authority or accident investigation body for defined occurrences, with the time limits attached to the external track. When a stem describes a serious event, check whether the question asks who must be informed outside the organisation, and answer with the external recipient and the deadline rather than the internal one.
Answering human factors questions in Module 16 with generic safety culture statements instead of the specific maintenance human factors concepts such as the 'dirty dozen', the error chain, and the difference between an error and a violation.
Human factors content overlaps with the softer safety material candidates skim, and under time pressure they choose the longest, most reassuring option rather than the option that names the correct concept. The exam rewards precise terminology.
What to do instead
Learn the core vocabulary as definitions you can state in one line each: error versus violation, latent versus active failure, the dirty dozen factors and a concrete maintenance example for each, and the purpose of the error management and reporting systems. When answering, reject options that are merely virtuous and select the one that correctly names and applies the concept in the stem.
Misapplying the relationship between the Part-145 quality system and the Part-M continuing airworthiness management organisation, for example answering that the quality manager of the maintenance organisation audits the operator's continuing airworthiness management activities as a matter of course.
Both organisations have quality functions and both are audited, so candidates assume one quality system covers both. The boundary between the maintenance organisation's own quality monitoring and the operator's management of continuing airworthiness is rarely drawn explicitly in revision notes.
What to do instead
Draw the boundary as two separate boxes: the maintenance organisation monitors its own Part-145 activities through its quality system, while the continuing airworthiness management organisation monitors its own Part-M activities, and where the two functions sit in one organisation the arrangements must be described and approved. Answer boundary questions by identifying which approval the activity belongs to before deciding who audits it.
Answering questions on records and release documentation by treating the certificate of release to service and the maintenance record as the same document, and stating that the certificate of release to service is retained by the maintenance organisation indefinitely rather than being issued to the aircraft and its records kept for the required period.
The two documents are produced at the same moment by the same person, so they merge in memory. Candidates also generalise 'keep records for a long time' without attaching the retention rule to the correct document and the correct holder.
What to do instead
Separate them by function: the certificate of release to service is the declaration that the maintenance has been properly carried out and is issued on completion, while the maintenance record is the detailed account of the work, and the retention obligations attach to specified records held by the organisation and by the operator. For each question, ask 'is this the declaration or the detail, and who holds it?' and answer from that split.