GCAA Ghana AME Exam common mistakes
GCAA Ghana AME Exam · Understand the traps and how to avoid them.
Working physics and maths items in whatever unit the numbers arrive in, then writing the answer without converting (e.g. leaving a force in kN when the formula needs N, or mixing feet with metres in a lift or pressure calculation).
Candidates drill formulas but practise them with already-consistent units, so the conversion step never becomes part of the routine; under time pressure the arithmetic is done on the raw numbers and the unit mismatch is invisible on the answer sheet.
What to do instead
Before substituting numbers, write a one-line unit declaration for every quantity in the question and force each into SI (or the stated target unit) in that line; keep a conversion strip (1 in = 25.4 mm, 1 lb = 0.4536 kg, 1 psi = 6.895 kPa, 1 knot = 0.5144 m/s) on the scratch sheet and check the final unit as a separate step.
Applying the wrong power formula to AC circuits - using P = VI directly on a reactive load, or mixing rms and peak values within the same calculation.
The DC habits learned first are strong, and the power-factor and root-two factors are easy to drop when a question presents '230 V, 10 A' without saying whether those are rms or peak, so candidates average the two approaches and get a plausible but wrong figure.
What to do instead
Build a three-line decision ladder on the scratch sheet (resistive: P = VI; reactive: P = VI cos φ, Q = VI sin φ; rms versus peak: multiply or divide by √2 before squaring) and state which line applies before touching the calculator; practise five mixed items per session until the ladder is automatic.
Confusing the roles and signal conventions of avionics data buses and logic elements - for example treating ARINC 429 as bidirectional, or misreading a NAND/NOR truth table by inverting the wrong stage.
Digital technique items are short and look familiar, so candidates answer from vague recall of the label rather than reconstructing the device; the 429/ARINC 629 distinction and multi-stage gate inversion both punish that shortcut.
What to do instead
For every bus question, write the three attributes (direction, wire count, label/parity scheme) before choosing; for logic, redraw the gate with each intermediate output labelled A, B, C before evaluating, and re-derive one truth table per gate type from the definition rather than memory.
Choosing a fastener, locking device or bearing by appearance and general reputation rather than by the stated material, load direction and temperature, or quoting a torque figure without checking whether it is dry or lubricated.
Hardware items reward pattern-matching, and past experience with one airframe type overrides the conditions actually printed in the stem; the friction condition of a torque value is the single most-missed qualifier.
What to do instead
Convert each stem into a three-column scratch note (material, load/temperature, corrosion environment) and eliminate options that violate any column; whenever a torque is quoted, immediately ask 'dry or wet, and what is the specified friction coefficient?' and select the option that states it.
Answering maintenance-practices items from hangar habit rather than from the published procedure - e.g. describing a lockwire or torque sequence, a corrosion treatment, or a rigging check the way it is done on their own type instead of the way the manual specifies.
Experienced candidates have a strong practised routine that is usually right in outcome but not in the exact step order, direction of twist, or inspection interval the question is testing, and the familiar option feels safer than the literal one.
What to do instead
For procedure items, answer only from the steps as written (twist direction, 6–8 turns per inch, pigtail length, sequence of nuts, NDT method by defect type) and flag any question where personal practice differs so it can be re-checked against the standard; do not let shop-floor memory override the printed step.
Treating basic and aeroplane aerodynamics as one subject - using the basic-aerodynamics answer (centre of pressure movement, downwash, induced drag trend) where the question is about a specific aeroplane configuration such as flaps, slats, or a swept wing at high Mach.
The two domains overlap in vocabulary, and candidates who revise them together store one blended answer; the stem's configuration words (flap setting, sweep, speed regime) are skimmed because the concept feels known.
What to do instead
Revise them in separate sittings with separate summary sheets, and before answering any aerodynamics item underline the configuration and speed qualifiers in the stem; if the stem mentions a specific aeroplane system, route to the systems domain answer first, then check it against the basic principle.
Answering human-factors items with the moral or disciplinary answer (blame, carelessness, 'should have been more careful') instead of the error-model answer (violation versus slip versus lapse versus mistake, and the organisational precursors).
Human factors reads like common sense, so candidates do not build a taxonomy, and under time pressure the intuitive judgement option looks correct while the technically framed one looks evasive.
What to do instead
Memorise the four-way error classification with one example each and a short list of precursors (fatigue, complacency, pressure, distraction, lack of assertiveness, inadequate resources); answer by classifying the described behaviour first, then picking the option that names that class or precursor, and reject any option that is purely an attribution of blame.
Mixing regulatory bodies and document levels - attributing a requirement to the wrong authority (GCAA versus ICAO versus EASA/FAA), or confusing a regulation with an acceptable means of compliance, an advisory circular, or a maintenance organisation exposition.
The wording of the options is deliberately similar and candidates revise the content of the rule without fixing its status or its issuing body, so the hierarchy is reconstructed at the moment of answering and slips.
What to do instead
Maintain a one-page hierarchy chart (Convention/Annex → national act and regulations → implementing standards → AMC/advisory material → organisation exposition and procedures) and, for every legislation item, write the issuing body and the document level beside the answer before selecting; drill 20 'who issues what' pairings per session.
Describing a system by its component names rather than by its function and failure effect - e.g. listing what a hydraulic or pressurisation system contains when the question asks what happens to the aircraft or crew when a particular element fails.
Systems are learned as diagrams to be labelled, so recall runs to components; the stem's 'what is the effect/consequence' wording is not matched to a consequence-based answer.
What to do instead
For each major system, write a three-line card in the form 'input → function → effect of loss', and practise answering only in effect terms (loss of redundancy, degraded mode, warning indication, crew action); if the chosen option is a component name, re-read the stem to confirm it asked for one.
Conflating gas-turbine and piston-engine parameters - applying a turbine relationship (e.g. thrust versus EPR/N1, or the effect of a choked nozzle) to a reciprocating engine item, or quoting a piston-engine mixture/detonation rule for a turbine combustion question.
Both engine domains are revised from the same notes and share words like 'compression ratio', 'mixture' and 'power', so the first engine frame that comes to mind is applied without checking which cycle the stem describes.
What to do instead
Split propulsion revision into two clearly labelled blocks and begin every item by writing 'Brayton/gas turbine' or 'Otto/reciprocating' at the top of the scratch space; list the three parameters that differ most between them (thrust versus brake power, EGT/TGT versus CHT, EPR/N1 versus manifold pressure/rpm) and check the chosen answer against that list.