Brunei DCA CPL(A) Human Performance common mistakes
Brunei DCA CPL(A) Human Performance · Understand the traps and how to avoid them.
Choosing the physiologically 'safer-sounding' option (e.g. 'immediately increase oxygen flow to maximum' or 'descend rapidly') in scenarios where the correct answer is a specific staged procedure, such as donning mask and checking flow before initiating an emergency descent, or treating hyperventilation by consciously slowing the breathing rate rather than giving oxygen.
Candidates pattern-match on keywords like 'hypoxia' or 'hyperventilation' and pick the most dramatic intervention, rather than reasoning through the distinguishing signs (cyanosis, impaired judgement, relief with descent versus tingling, dizziness and carpopedal spasm in hyperventilation) and the sequence required by the checklist.
What to do instead
Before answering, write down the two or three discriminating signs of each condition and the standard first action for each, then check that the chosen option addresses the actual condition described, not the topic heading. Practise paired vignettes (one hypoxic, one hyperventilating, same symptoms partially overlapping) and justify why the other option is wrong.
Confusing the functions and divisions of the autonomic nervous system, or misattributing a symptom to the wrong branch (e.g. saying the parasympathetic system dilates the pupil or that adrenaline slows the heart), and mixing up the roles of the sympathetic and parasympathetic systems in the stress response.
The material is learned as a list of organs rather than as a paired antagonistic system, so under exam pressure candidates guess which branch does what, especially for pupils, bronchi, digestion and sweat glands.
What to do instead
Build a two-column table (sympathetic versus parasympathetic) for pupils, heart rate, bronchi, gut motility, sweat and blood flow to muscle, and rehearse it until recall is automatic; then answer five stress-response questions and check each answer against the table.
Mixing up vestibular end organs and their specific stimuli: attributing linear acceleration or gravity sensing to the semicircular canals, or rotation to the otoliths, and therefore mis-explaining the somatogravic and Coriolis illusions.
Candidates remember that 'the vestibular system detects acceleration' without separating the canals (angular acceleration, fluid flow in the crista) from the otoliths (linear acceleration and tilt, otolithic membrane on the macula), so illusion questions are answered from a vague general impression.
What to do instead
Learn one sentence per organ: canals detect angular acceleration and cannot signal sustained rotation; otoliths detect linear acceleration and gravity and cannot distinguish tilt from translation. Then work through somatogravic (take-off acceleration feels like pitch-up), somatogyral and Coriolis illusions by naming the organ involved and the false sensation produced.
Treating 'the leans', graveyard spiral, somatogravic illusion and inversion illusion as interchangeable, or answering spatial disorientation questions with 'trust your instruments' without identifying which illusion is being described and why the pilot's correction is wrong.
All disorientation items share the same vocabulary, so candidates stop reading at the word 'illusion' and select any option mentioning instruments or recovery, missing the cue in the scenario (e.g. a gentle prolonged turn with a slight bank, or acceleration on take-off in low visibility).
What to do instead
For each illusion write the manoeuvre that provokes it, the false sensation and the typical erroneous control input. On each question, underline the provoking manoeuvre first, name the illusion, then read the options; 'trust the instruments' is only correct when the question asks for the general remedy, not the identification.
Confusing decompression sickness with barotrauma, or with hypoxia, and selecting the wrong treatment (e.g. recompression for ear pain, or continued flight for joint pain after a dive), and mis-stating the role of denitrogenation and pre-oxygenation.
Both pressure topics involve gas and altitude, so candidates collapse them into one concept and lose the distinguishing features: DCS is evolved gas in tissues after a pressure reduction, barotrauma is failure of a gas-filled cavity to equalise, and each has a different management and fitness-to-fly decision.
What to do instead
Make a three-way comparison table (DCS, barotrauma, hypoxia) with cause, typical symptoms, first action and follow-up. Learn the dive-to-flight interval and the meaning of denitrogenation as separate facts, then answer mixed questions while stating aloud which category the scenario falls into before choosing.
Applying a single 'one size fits all' fatigue rule: assuming a fixed number of hours of sleep is sufficient for everyone, that caffeine replaces sleep, or that the circadian low occurs at a fixed clock time regardless of the pilot's roster, and failing to distinguish sleep debt from circadian disruption.
Fatigue content is taught as general advice, so candidates answer from personal experience rather than from the concepts of sleep architecture, sleep inertia, circadian rhythm and cumulative debt, and miss questions that test the mechanism rather than the remedy.
What to do instead
Learn the definitions separately: sleep debt (cumulative shortfall), circadian low (early morning and mid-afternoon troughs, shifted by roster and time zone), sleep inertia (immediate post-waking impairment) and controlled rest. For each scenario, identify which mechanism is being tested before evaluating the options, and reject options that promise a substitute for sleep.
Describing human error and TEM with loose everyday language, for example treating 'violation' and 'error' as synonyms, calling a slip a mistake, or failing to separate a threat from an error and an undesired aircraft state in a described sequence of events.
The taxonomy is learned by feel rather than by definition, so candidates cannot reliably classify a described event, and they lose marks on questions that simply ask what kind of error or outcome occurred.
What to do instead
Memorise the definitions with one example each: slip (right intention, wrong execution), lapse (omitted step), mistake (wrong intention or plan), violation (deliberate deviation). Practise classifying ten short event descriptions into threat, error (subtype) and undesired state, and check the classification before reading the options.
Answering CRM and decision-making questions with the 'authoritarian' or 'everyone agrees' option, or treating situational awareness as simply 'looking outside', rather than recognising the behaviours that build a shared mental model, assertiveness, closed-loop communication and the detection of loss of SA.
Candidates rely on intuition about good teamwork and pick options that sound decisive or harmonious, missing the exam's emphasis on graded assertiveness, cross-checking, briefing and the difference between individual and shared SA.
What to do instead
Learn the specific observable behaviours: closed-loop communication, inquiry and advocacy, graded assertiveness levels, effective briefings and the three levels of SA (perception, comprehension, projection). Reject options that rely on hierarchy or assumed understanding, and justify each chosen option by naming the behaviour it demonstrates.
Misjudging acceleration questions by confusing positive and negative G effects, or attributing grey-out, black-out and red-out to the wrong direction of acceleration, and mixing up the effects of sustained versus transient G on vision and consciousness.
The physiology is learned as a list of symptoms without a clear model of where blood goes under each G direction, so candidates guess between grey-out, black-out and red-out and cannot link them to the correct cause.
What to do instead
Anchor everything to blood distribution: positive G drives blood away from the head, causing grey-out then black-out and eventually G-LOC; negative G drives blood toward the head, causing red-out and discomfort. Draw the head and the blood shift for each case, then answer questions by identifying the G direction first.
Giving a fitness-to-fly or health answer that ignores the regulatory and operational dimension, for example clearing a pilot with an ordinary cold to fly, or answering a medication question from personal experience rather than from the principles of self-assessment, grounding and recertification.
Candidates treat health items as general knowledge and forget that the exam tests the pilot's decision process: recognise symptoms, self-ground, seek aeromedical advice, and understand why certain conditions and drugs are disqualifying.
What to do instead
Learn a short decision framework (symptoms, medication, effect on performance, regulatory requirement, aeromedical advice) and apply it to every health scenario. Memorise the categories that require grounding (e.g. ear blockage, significant fatigue, sedating medication) and answer by applying the framework rather than by judging whether the pilot 'feels fine'.