Irish Aviation Authority Part-66 Basic Knowledge
Examination – Module 14: Propulsion
,1. Which response best controls immediate risk involving Maintenance safety, preservation, inspection and ground-run precautions
within the aircraft during a technical documentation review? The work is near completion when a discrepancy is found in 2 of 8
records selected for acceptance review.
A. Stop or isolate the affected activity, assess the hazard, communicate the risk, and resume only after required controls are
confirmed effective.
B. Assume the abnormal condition is acceptable because no injury or damage has occurred.
C. Temporarily bypass the protective control so the task can be completed on time.
D. Record the hazard after completion but do not interrupt the current operation.
Correct Answer: A
Explanation: For Maintenance safety, preservation, inspection and ground-run precautions, schedule pressure does not justify
bypassing a protective control. Establishing a safe condition and confirming safeguards protects people and equipment before normal
activity continues.
2. Which action best reduces the risk of a unit, input, or assumption error involving Engine operating cycles, efficiency and
performance variables as applied to aircraft propulsion during a supervised practical activity? The procedure is current, but the
observed condition differs from the documented baseline by 23% and affects 3 related items.
A. Select the most favorable result from repeated calculations without investigating the variation.
B. Validate measurements and inputs, apply the approved calculation method, compare the result with required limits, and retain the
calculation record.
C. Adjust an input until the result falls within the target range and record only the final value.
D. Ignore unit or assumption differences if the final number appears reasonable.
Correct Answer: B
Explanation: The safest numerical approach for Engine operating cycles, efficiency and performance variables as applied to is to
validate source data and independently check the result before use. Selecting a favorable number without resolving differences is not
acceptable practice.
3. What should be verified first when a practitioner encounters uncertainty involving Intake, compression, combustion, turbine and
exhaust functions with decisions and evidence relevant during final verification before release or acceptance? Three independent
observations are available; the largest difference between them is 5%, and one required check remains incomplete.
A. Treat the issue as administrative and continue while the technical evidence remains unresolved.
B. Change the acceptance criterion to match the observed condition without formal authorization.
C. Confirm the applicable criteria and current condition, investigate unresolved differences, and retain a traceable decision record.
D. Repeat only the final step without checking the underlying inputs, records, or controls.
Correct Answer: C
Explanation: When Intake, compression, combustion, turbine and exhaust functions with is uncertain, the practitioner should
investigate and document rather than bypass the control. This supports consistent, reviewable, and technically justified work.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 2
,4. Which action best reduces the risk of a unit, input, or assumption error involving Piston, valve, ignition, induction, lubrication and
cooling systems for safe, accurate work in during pre-task planning? The current review covers 47 records; 5 still require follow-up,
and the latest verification was completed 17 hours ago.
A. Use the previous calculation unchanged even though one or more current inputs have changed.
B. Verify source data, units, assumptions, and limits; recalculate independently and document the checked result before using it.
C. Select the most favorable result from repeated calculations without investigating the variation.
D. Proceed using an estimate even though current source data and the approved method are available.
Correct Answer: B
Explanation: A result involving Piston, valve, ignition, induction, lubrication and cooling systems for is only reliable when its inputs,
units, assumptions, and method are verified. An independent recalculation reduces the risk of carrying an unnoticed numerical error
into the decision.
5. Which step is most important when checking a calculation involving Propeller geometry, pitch control, governing and aerodynamic
loads through realistic aircraft during a field or operational inspection? The latest measurement is 6% different from the prior verified
value, while 6 supporting record(s) await confirmation.
A. Average conflicting results and accept the midpoint without checking the source data.
B. Proceed using an estimate even though current source data and the approved method are available.
C. Use the previous calculation unchanged even though one or more current inputs have changed.
D. Confirm the current inputs and approved method, repeat the calculation with an independent reasonableness check, and resolve
any difference.
Correct Answer: D
Explanation: For Propeller geometry, pitch control, governing and aerodynamic loads through, changed inputs require a fresh
calculation using the approved method. Checking units and reasonableness makes the result reproducible and defensible.
6. Which action best reduces the risk of a unit, input, or assumption error involving Fuel metering, engine control and starting
sequences with emphasis on boundaries and during a routine quality-control review? Before release, 32 checks are reviewed and 1
remain open even though the scheduled decision is due within 51 hours.
A. Adjust an input until the result falls within the target range and record only the final value.
B. Validate measurements and inputs, apply the approved calculation method, compare the result with required limits, and retain the
calculation record.
C. Use the previous calculation unchanged even though one or more current inputs have changed.
D. Average conflicting results and accept the midpoint without checking the source data.
Correct Answer: B
Explanation: The safest numerical approach for Fuel metering, engine control and starting sequences with emphasis on is to validate
source data and independently check the result before use. Selecting a favorable number without resolving differences is not
acceptable practice.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 3
, 7. Which step is most important when checking a calculation involving Instrument indications, operating limitations and trend
monitoring for defensible calculations and during a shift or responsibility handover? The responsible practitioner receives 45
observations from two sources, with a 7% difference in the most critical value.
A. Pause the dependent decision, reconcile changed inputs, recalculate using the current method, and obtain a second check for
critical results.
B. Ignore unit or assumption differences if the final number appears reasonable.
C. Average conflicting results and accept the midpoint without checking the source data.
D. Adjust an input until the result falls within the target range and record only the final value.
Correct Answer: A
Explanation: Calculations for Instrument indications, operating limitations and trend monitoring for depend on current data and
controlled assumptions. Reconciliation and a second check are appropriate before the result supports acceptance or release.
8. Which action best reduces the risk of a unit, input, or assumption error involving Navigation, charts, radio aids, flight planning, fuel
and alternate requirements including during an incident or deviation follow-up? A sample of 17 items is examined; 3 show a different
condition, and the supporting record is 13 hours old.
A. Verify source data, units, assumptions, and limits; recalculate independently and document the checked result before using it.
B. Select the most favorable result from repeated calculations without investigating the variation.
C. Adjust an input until the result falls within the target range and record only the final value.
D. Ignore unit or assumption differences if the final number appears reasonable.
Correct Answer: A
Explanation: A result involving Navigation, charts, radio aids, flight planning, fuel and alternate is only reliable when its inputs, units,
assumptions, and method are verified. An independent recalculation reduces the risk of carrying an unnoticed numerical error into the
decision.
9. Which step is most important when checking a calculation involving Human performance, workload, fatigue, situational awareness
and threat management to support during a technical documentation review? The field condition and the approved record agree on
most points, but 4 of 30 checked elements require reconciliation.
A. Proceed using an estimate even though current source data and the approved method are available.
B. Confirm the current inputs and approved method, repeat the calculation with an independent reasonableness check, and resolve
any difference.
C. Ignore unit or assumption differences if the final number appears reasonable.
D. Select the most favorable result from repeated calculations without investigating the variation.
Correct Answer: B
Explanation: For Human performance, workload, fatigue, situational awareness and threat, changed inputs require a fresh calculation
using the approved method. Checking units and reasonableness makes the result reproducible and defensible.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 4
Examination – Module 14: Propulsion
,1. Which response best controls immediate risk involving Maintenance safety, preservation, inspection and ground-run precautions
within the aircraft during a technical documentation review? The work is near completion when a discrepancy is found in 2 of 8
records selected for acceptance review.
A. Stop or isolate the affected activity, assess the hazard, communicate the risk, and resume only after required controls are
confirmed effective.
B. Assume the abnormal condition is acceptable because no injury or damage has occurred.
C. Temporarily bypass the protective control so the task can be completed on time.
D. Record the hazard after completion but do not interrupt the current operation.
Correct Answer: A
Explanation: For Maintenance safety, preservation, inspection and ground-run precautions, schedule pressure does not justify
bypassing a protective control. Establishing a safe condition and confirming safeguards protects people and equipment before normal
activity continues.
2. Which action best reduces the risk of a unit, input, or assumption error involving Engine operating cycles, efficiency and
performance variables as applied to aircraft propulsion during a supervised practical activity? The procedure is current, but the
observed condition differs from the documented baseline by 23% and affects 3 related items.
A. Select the most favorable result from repeated calculations without investigating the variation.
B. Validate measurements and inputs, apply the approved calculation method, compare the result with required limits, and retain the
calculation record.
C. Adjust an input until the result falls within the target range and record only the final value.
D. Ignore unit or assumption differences if the final number appears reasonable.
Correct Answer: B
Explanation: The safest numerical approach for Engine operating cycles, efficiency and performance variables as applied to is to
validate source data and independently check the result before use. Selecting a favorable number without resolving differences is not
acceptable practice.
3. What should be verified first when a practitioner encounters uncertainty involving Intake, compression, combustion, turbine and
exhaust functions with decisions and evidence relevant during final verification before release or acceptance? Three independent
observations are available; the largest difference between them is 5%, and one required check remains incomplete.
A. Treat the issue as administrative and continue while the technical evidence remains unresolved.
B. Change the acceptance criterion to match the observed condition without formal authorization.
C. Confirm the applicable criteria and current condition, investigate unresolved differences, and retain a traceable decision record.
D. Repeat only the final step without checking the underlying inputs, records, or controls.
Correct Answer: C
Explanation: When Intake, compression, combustion, turbine and exhaust functions with is uncertain, the practitioner should
investigate and document rather than bypass the control. This supports consistent, reviewable, and technically justified work.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 2
,4. Which action best reduces the risk of a unit, input, or assumption error involving Piston, valve, ignition, induction, lubrication and
cooling systems for safe, accurate work in during pre-task planning? The current review covers 47 records; 5 still require follow-up,
and the latest verification was completed 17 hours ago.
A. Use the previous calculation unchanged even though one or more current inputs have changed.
B. Verify source data, units, assumptions, and limits; recalculate independently and document the checked result before using it.
C. Select the most favorable result from repeated calculations without investigating the variation.
D. Proceed using an estimate even though current source data and the approved method are available.
Correct Answer: B
Explanation: A result involving Piston, valve, ignition, induction, lubrication and cooling systems for is only reliable when its inputs,
units, assumptions, and method are verified. An independent recalculation reduces the risk of carrying an unnoticed numerical error
into the decision.
5. Which step is most important when checking a calculation involving Propeller geometry, pitch control, governing and aerodynamic
loads through realistic aircraft during a field or operational inspection? The latest measurement is 6% different from the prior verified
value, while 6 supporting record(s) await confirmation.
A. Average conflicting results and accept the midpoint without checking the source data.
B. Proceed using an estimate even though current source data and the approved method are available.
C. Use the previous calculation unchanged even though one or more current inputs have changed.
D. Confirm the current inputs and approved method, repeat the calculation with an independent reasonableness check, and resolve
any difference.
Correct Answer: D
Explanation: For Propeller geometry, pitch control, governing and aerodynamic loads through, changed inputs require a fresh
calculation using the approved method. Checking units and reasonableness makes the result reproducible and defensible.
6. Which action best reduces the risk of a unit, input, or assumption error involving Fuel metering, engine control and starting
sequences with emphasis on boundaries and during a routine quality-control review? Before release, 32 checks are reviewed and 1
remain open even though the scheduled decision is due within 51 hours.
A. Adjust an input until the result falls within the target range and record only the final value.
B. Validate measurements and inputs, apply the approved calculation method, compare the result with required limits, and retain the
calculation record.
C. Use the previous calculation unchanged even though one or more current inputs have changed.
D. Average conflicting results and accept the midpoint without checking the source data.
Correct Answer: B
Explanation: The safest numerical approach for Fuel metering, engine control and starting sequences with emphasis on is to validate
source data and independently check the result before use. Selecting a favorable number without resolving differences is not
acceptable practice.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 3
, 7. Which step is most important when checking a calculation involving Instrument indications, operating limitations and trend
monitoring for defensible calculations and during a shift or responsibility handover? The responsible practitioner receives 45
observations from two sources, with a 7% difference in the most critical value.
A. Pause the dependent decision, reconcile changed inputs, recalculate using the current method, and obtain a second check for
critical results.
B. Ignore unit or assumption differences if the final number appears reasonable.
C. Average conflicting results and accept the midpoint without checking the source data.
D. Adjust an input until the result falls within the target range and record only the final value.
Correct Answer: A
Explanation: Calculations for Instrument indications, operating limitations and trend monitoring for depend on current data and
controlled assumptions. Reconciliation and a second check are appropriate before the result supports acceptance or release.
8. Which action best reduces the risk of a unit, input, or assumption error involving Navigation, charts, radio aids, flight planning, fuel
and alternate requirements including during an incident or deviation follow-up? A sample of 17 items is examined; 3 show a different
condition, and the supporting record is 13 hours old.
A. Verify source data, units, assumptions, and limits; recalculate independently and document the checked result before using it.
B. Select the most favorable result from repeated calculations without investigating the variation.
C. Adjust an input until the result falls within the target range and record only the final value.
D. Ignore unit or assumption differences if the final number appears reasonable.
Correct Answer: A
Explanation: A result involving Navigation, charts, radio aids, flight planning, fuel and alternate is only reliable when its inputs, units,
assumptions, and method are verified. An independent recalculation reduces the risk of carrying an unnoticed numerical error into the
decision.
9. Which step is most important when checking a calculation involving Human performance, workload, fatigue, situational awareness
and threat management to support during a technical documentation review? The field condition and the approved record agree on
most points, but 4 of 30 checked elements require reconciliation.
A. Proceed using an estimate even though current source data and the approved method are available.
B. Confirm the current inputs and approved method, repeat the calculation with an independent reasonableness check, and resolve
any difference.
C. Ignore unit or assumption differences if the final number appears reasonable.
D. Select the most favorable result from repeated calculations without investigating the variation.
Correct Answer: B
Explanation: For Human performance, workload, fatigue, situational awareness and threat, changed inputs require a fresh calculation
using the approved method. Checking units and reasonableness makes the result reproducible and defensible.
Irish Aviation Authority Part-66 Basic Knowledge Examination – Module 14: Propulsion
Page 4
