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Key Facts: Engineer Aircraft Exam

80 items

Official written paper length (4 subjects × 20)

Q-Net Engineer-grade grading method; Enforcement Rule [별표 8]; Q-Net 항공기사 page

120 minutes

Written timing at 30 minutes per subject

Q-Net 필기시험 접수안내 (기사·산업기사 과목별 30분)

40 / 60

Written per-subject floor and overall average

Q-Net 검정기준 및 방법 (기사)

KRW 19,400

Written registration fee on the Q-Net 항공기사 page

Q-Net crf005 jmCd=1240, checked 2026-09-20

KRW 22,600

Practical registration fee on the Q-Net 항공기사 page

Q-Net crf005 jmCd=1240, checked 2026-09-20

2 years

Written-pass exemption period from the pass date

National Technical Qualifications Act Enforcement Decree Article 21

항공기사 is HRD Korea's Engineer-grade aircraft qualification. The 2026 written paper is 80 four-option items in four subjects (20 each, 30 minutes each), with a 40-per-subject and 60-average pass rule, followed by a written-answer practical in 항공기설계 실무. Official fees on Q-Net are KRW 19,400 written and KRW 22,600 practical. OpenExamPrep offers independent English MCQ study for the written topics, not an official translation or practical simulation.

Sample Engineer Aircraft Practice Questions

Try these sample questions to review concepts for the Engineer Aircraft exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the ICAO International Standard Atmosphere (국제표준대기, ISA) used for aircraft performance, what is the sea-level temperature?
A.0 °C
B.15 °C
C.25 °C
D.−56.5 °C
Explanation: ISA sea-level temperature is 15 °C (288.15 K). Engineer Aircraft aerodynamics items treat this as the reference for density, speed of sound, and tropopause calculations.
2What is the ISA tropospheric temperature lapse rate (온도감률) with geometric height?
A.6.5 K per kilometre (temperature falls with height)
B.9.8 K per kilometre decrease
C.Temperature is constant from sea level to 20 km
D.Temperature rises 6.5 K per kilometre
Explanation: ISA defines a linear tropospheric lapse of 6.5 K/km (about 1.98 °C per 1,000 ft) from sea level to the tropopause. That is a standard-atmosphere model, not the dry-adiabatic process of a rising air parcel.
3Along a horizontal streamline of steady incompressible inviscid flow, Bernoulli’s equation (베르누이 방정식) states that which combination is constant?
A.Static pressure only
B.Static pressure plus dynamic pressure (p + ½ρV²)
C.Static pressure plus ρV²
D.Static pressure minus dynamic pressure (p − ½ρV²)
Explanation: Bernoulli’s equation equates total (stagnation) pressure to static plus dynamic pressure: p + ½ρV² = constant along a streamline when the flow is steady, incompressible, and inviscid. Pitot-static airspeed measurement uses this split.
4Which expression is the aerodynamic lift (양력) on a wing?
A.L = ρ V S / CL
B.L = 2 ρ V² S CL
C.L = ½ ρ V² S CL
D.L = mg only, independent of speed
Explanation: Lift is L = q S CL with dynamic pressure q = ½ρV², so L = ½ρV² S CL. CL is the lift coefficient from angle of attack, camber, and planform.
5A wing stalls (실속) when which condition is reached?
A.The lift coefficient reaches its maximum value CL,max and the boundary layer separates
B.Parasite drag reaches its minimum value
C.The pitching-moment coefficient passes through zero
D.The free-stream Mach number reaches the wing’s critical Mach number
Explanation: Stall is the breakdown of attached flow at high angle of attack when CL reaches CL,max. Speed at stall then follows from the lift equation for the current load factor and density.
6For a given wingspan b and wing area S, aspect ratio (가로세로비) AR is defined as which ratio?
A.AR = S / b
B.AR = b / S
C.AR = b² / S
D.AR = S² / b
Explanation: Aspect ratio is AR = b²/S, equivalently b/c_avg for a rectangular wing. Higher AR reduces induced drag for a given CL.
7Dynamic pressure (동압) q used in force coefficients is which quantity?
A.q = ρ V²
B.q = ½ ρ V²
C.q = ρ g h
D.q = p_total + p_static
Explanation: Dynamic pressure is q = ½ρV². Aerodynamic force is written F = q S C, so coefficients CL, CD, and CM are referred to this q.
8In steady level flight, load factor n (하중배수) is defined as which ratio?
A.Thrust divided by drag
B.Lift divided by weight (n = L/W)
C.Weight divided by lift (n = W/L)
D.Dynamic pressure times wing area divided by weight (n = qS/W)
Explanation: Load factor is n = L/W. It is 1 in steady level flight and rises in a pull-up or banked turn. Structural V-n limits are drawn in units of n.
9Maximum lift-to-drag ratio (L/D)max of an aircraft most directly sets which unpowered performance quantity?
A.Best-glide ratio and still-air glide range
B.The minimum 1 g stall speed
C.The maximum rate-of-climb speed
D.The maneuvering speed VA
Explanation: In a steady glide, L/D equals the glide ratio (horizontal distance per unit height, ignoring wind). (L/D)max therefore sets the still-air maximum glide range.
10ISA sea-level density is 1.225 kg/m³. For a wing of area S = 16 m² at true airspeed 50 m/s and CL = 0.50, what is the lift?
A.2,450 N
B.12,250 N
C.24,500 N
D.49,000 N
Explanation: L = ½ρV² S CL = 0.5 × 1.225 × 50² × 16 × 0.50. First ½ρV² = 0.5 × 1.225 × 2,500 = 1,531.25 Pa, then × 16 × 0.50 = 12,250 N.

About the Engineer Aircraft Exam

Engineer Aircraft (항공기사) is South Korea's Engineer-grade national technical qualification in aircraft engineering, administered by HRD Korea on Q-Net under MOLIT. It is not the Aviation Safety Act personnel licence 항공정비사, and it is not a qualification titled 항공정비기사. The written paper uses four-option multiple-choice items across aerodynamics, aircraft engines, aircraft structures, and aircraft control and systems. After a written pass, candidates sit a written-answer practical examination in 항공기설계 실무. Q-Net publishes the specifications reviewed here in Korean. The questions on this page are independent English-language MCQ study practice for those written topics; they are not an official translation, not a format simulation, and not a substitute for the practical stage.

Exam sponsor: HRD Korea (Q-Net) / Ministry of Land, Infrastructure and Transport (MOLIT). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written paper covering 항공역학, 항공기 엔진, 항공기 구조, and 항공 제어 및 시스템 (20 items and 30 minutes each), followed by a written-answer practical examination in 항공기설계 실무. OpenExamPrep study weights below match the four equal written subjects.

Time Limit

120 minutes for the four written subjects (30 minutes each); 150 minutes for the written-answer practical in 항공기설계 실무

Passing Score

Written: 40+ per subject and 60 average; practical: 60/100

Exam / Certification Fees

KRW 19,400 written / KRW 22,600 practical (Q-Net, 2026-09-20)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Aerodynamics (항공역학)

ISA atmosphere, lift and drag, stall, Mach and compressibility, induced drag, static stability, and performance quantities used to generate aerodynamic design data.

25%

Aircraft Engines (항공기 엔진)

Otto and Brayton cycles, piston and turbine engines, bypass ratio, compressor stall, turbine temperature, propellers, and engine performance parameters.

25%

Aircraft Structures (항공기 구조)

Stress-strain relations, airframe construction, aluminum and composites, fatigue and damage tolerance, V-n envelope, and structural safety-margin calculations.

25%

Aircraft Control and Systems (항공 제어 및 시스템)

Feedback control, flying qualities, hydraulic and electrical systems, pitot-static and gyro instruments, autopilots, and avionics integration.

Preparing for the Engineer Aircraft Exam

What You Need to Know

  • Passing score: Written: 40+ per subject and 60 average; practical: 60/100
  • Assessment: Written paper covering 항공역학, 항공기 엔진, 항공기 구조, and 항공 제어 및 시스템 (20 items and 30 minutes each), followed by a written-answer practical examination in 항공기설계 실무. OpenExamPrep study weights below match the four equal written subjects.
  • Time limit: 120 minutes for the four written subjects (30 minutes each); 150 minutes for the written-answer practical in 항공기설계 실무
  • Exam / certification fees: KRW 19,400 written / KRW 22,600 practical (Q-Net, 2026-09-20) Official sources

Using Our Practice Resources

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Engineer Aircraft: Suggested Study Strategy

1Balance all four written subjects so you clear the 40-point per-subject floor (과락) as well as the 60 average.
2Practice lift, stall-speed, Mach, Brayton-efficiency, stress, and load-factor calculations; Engineer papers expect worked numbers, not only definitions.
3Keep 항공기사 (this Q-Net Engineer qualification) distinct from 항공정비사 (the TS personnel licence). Holding 항공기사 can later exempt parts of an 항공정비사 theory sitting under Aviation Safety Act Enforcement Rules Article 88, but they remain different credentials.
4Treat this English bank as topic drill. Check the current Q-Net candidate notice for official terminology and response requirements, and separately practice the worked design calculations required by the written-answer practical.

Frequently Asked Questions

What is Engineer Aircraft (항공기사)?

It is an Engineer-grade National Technical Qualification in aircraft engineering administered by HRD Korea on Q-Net, with MOLIT as the related ministry. Q-Net's official English name is Engineer Aircraft. It is separate from the Aviation Safety Act aircraft-maintenance personnel certificate (항공정비사) administered by the Korea Transportation Safety Authority (TS).

How is the official exam structured in 2026?

Q-Net and Enforcement Rule [별표 8] list a written paper of four-option items, 20 per subject, with Engineer-grade scoring (40 in each subject and 60 average). The four written subjects in force from 2024.1.1 are 항공역학, 항공기 엔진, 항공기 구조, and 항공 제어 및 시스템 (80 items, 120 minutes). A 150-minute written-answer practical in 항공기설계 실무 follows.

What language is the official exam, and what is this bank?

Q-Net publishes the specifications reviewed here in Korean but does not state the permitted delivery language or a multilingual option on those sources. This page is independent English-language multiple-choice study practice for the named written topics. It is not an official translation, not a CBT simulation, and not a substitute for the practical examination.

What are the 2026 fees and written timing?

The Q-Net 항공기사 page lists KRW 19,400 for the written paper and KRW 22,600 for the practical paper (checked 2026-09-20). Q-Net assigns 30 minutes per Engineer-grade written subject, so four subjects total 120 minutes.

How long does a written pass remain usable?

Under National Technical Qualifications Act Enforcement Decree Article 21, a written pass exempts that qualification's written paper for 2 years from the pass date. Check Q-Net for the sitting you plan to enter.