ANAC CEL Theoretical Exam (Airframe Group) common mistakes
ANAC CEL Theoretical Exam (Airframe Group) · Understand the traps and how to avoid them.
Treating ANAC regulation questions as if they were FAA or EASA rules, answering from memory of another authority's wording (for example applying FAA 14 CFR part 43 return-to-service language to a Brazilian maintenance-release question).
Most study material circulating online is FAA- or EASA-derived, and candidates substitute familiar foreign rules for the RBAC text because the wording looks similar.
What to do instead
Anchor every regulation answer to the specific RBAC (or the CBA/ANAC supplementary instruction) that governs it. Build a one-page table mapping each exam topic (maintenance release, record retention, airworthiness directives, licensed personnel privileges, SMS reporting) to its RBAC number and article, and cite that article when reviewing each practice question.
Confusing the privileges and limits of the different ANAC maintenance licences and ratings (for example assuming a mechanic may certify a major repair, or mixing the scope of airframe, engine, and avionics ratings), and misidentifying who may sign a maintenance release.
Privilege questions are read quickly as generic 'who can do maintenance' questions, and the distinctions between supervision, performance, inspection, and certification of work are blurred.
What to do instead
Study privileges as four separate verbs: perform, supervise, inspect, and release. For each licence and rating, write which of the four it permits and under what organisational context (approved maintenance organisation versus independent mechanic). Test yourself by rewriting each practice question to say which verb is being asked.
Using the wrong units or omitting the unit conversion in hydraulic, torque, and pressure calculations, and mixing gauge with absolute pressure.
Exam items deliberately mix units (psi, bar, kgf/cm2, in-lb, N-m, lbf), and candidates plug numbers into formulas without converting first, or forget that a system pressure gauge reads relative to ambient.
What to do instead
Adopt a fixed routine: write the given values with units, convert everything to one consistent system before calculating, and carry units through the arithmetic so a wrong unit is visible. For pressure problems, explicitly state whether the answer is gauge or absolute and add or subtract atmospheric pressure accordingly.
Misreading sheet-metal repair criteria: applying a repair scheme outside the limits of the structural repair manual, or choosing rivet pitch, edge distance, and row spacing without checking the specified ratios and fastener type.
Candidates memorise a few standard numbers and then apply them to every case, ignoring that allowable damage limits, fastener spacing rules, and repair classification depend on the specific structure and manual.
What to do instead
Practise with a structured checklist for every sheet-metal item: identify the structure and its classification, look up allowable damage and repair limits, then verify edge distance, pitch, row spacing, and fastener diameter against the applicable manual data. Work numerical spacing problems until the ratios are automatic.
Mixing up corrosion types and their typical locations, for example calling exfoliation intergranular or failing to link galvanic corrosion to dissimilar metal contact in the presence of an electrolyte.
The visual descriptions of corrosion forms overlap in textbook photos, and candidates learn the names without learning the mechanism and the material or environment that produces each one.
What to do instead
Build a table with one row per corrosion type listing mechanism, characteristic appearance, typical alloy or location, and the inspection or removal method. For each type, write one sentence explaining the electrochemical or chemical driver, then self-test by describing the appearance from memory and naming the type.
Answering electrical and avionics questions by treating wire gauge, circuit protection, and bonding as independent facts rather than as a system, for example selecting a breaker without considering wire current rating and voltage drop, or ignoring bonding resistance limits.
Electrical items are studied as isolated definitions, and the relationships between conductor size, load, protection rating, and bonding are never practised together.
What to do instead
For each circuit question, draw the path: source, protection, conductor, load, return, and bonding. State the rule that protection must protect the wire, and check voltage drop for the run length. Practise a small set of numerical items on wire sizing and bonding resistance until the relationships are automatic.
Describing flight-control rigging and assembly errors without the correct sequence or safety logic, such as ignoring control locks, cable tension versus temperature effects, or the need for a functional check after adjustment.
Rigging is learned as a list of steps, so candidates recall the components but not the order, the precautions, or the verification that follows the adjustment.
What to do instead
Learn each control system as a chain: input, linkage or cable run, sector or bellcrank, surface, and stops. For each chain, memorise the sequence (secure the system, adjust to specified tension or travel, verify stops and clearances, then perform an operational check and record it). Practise ordering steps in the correct sequence.
Confusing inspection types and their purpose, for example treating a scheduled inspection as a special inspection, or failing to distinguish an airworthiness directive from a service bulletin in terms of mandatory status and recording.
The terminology is similar and the documents look alike, so candidates answer from the general meaning of the words rather than from the regulatory definition and the recording requirement attached to each.
What to do instead
Create a comparison chart: scheduled, unscheduled, special, and conditional inspections, and airworthiness directives versus service bulletins versus service letters. For each, record who issues it, whether it is mandatory, what triggers it, and what must be entered in the aircraft records.
Answering documentation items by describing what should be recorded but omitting the required elements of a maintenance entry, such as the work performed, reference data, date, identity of the signatory, and the maintenance release.
Candidates know the general idea of record-keeping but have not memorised the specific fields that make an entry complete and traceable.
What to do instead
Memorise a fixed template for a maintenance record entry and a maintenance release, then apply it to every documentation question. Practise writing a complete entry for a sample task, then check it field by field against the regulatory requirement.
Applying generic hardware and safetying knowledge without checking the specific application, for example choosing a lockwire pattern or torque value that does not match the installation, or mixing AN, MS, and NAS fastener standards.
Hardware standards look interchangeable, and candidates rely on memorised torque figures or familiar safetying methods instead of the values and methods specified for the particular installation.
What to do instead
Learn fasteners by standard family with their identifying markings and typical use, and treat torque and safetying as installation-specific data to be looked up, not recalled. For practice items, always ask which document specifies the value, and review lockwire and cotter-pin procedures until the correct pattern is recognised on sight.