Summary of "항공정비사 면장 구술시험문제 특강 [제1회]"
Main ideas / lessons conveyed
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Purpose of the lecture: A “special lecture” focused on Aircraft Maintenance Technician oral exam questions. The questions were selected based on what aligns with supervisors’ evaluations and the aviation personnel qualification practical exam standards.
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Study strategy:
- Avoid over-studying unrelated materials.
- Memorize the provided standards, especially key articles/terms mentioned.
- If something is unclear, search for a detailed explanation in a specific content category: “Aircraft Maintenance Society” in Naeilro Aviation Story.
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Lecture structure:
- The first session covers the first of 26 standards related to the scope of maintenance work, broken into oral-exam “must-know” subtopics.
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Exam emphasis tactics:
- The speaker repeatedly distinguishes what is likely asked in the oral exam versus what may already have been covered in practical work (e.g., green-highlighted practical items).
- If an item was not included in that day’s practical exam, it will likely be asked in the oral exam.
Detailed methodology / “what to answer” instructions
1) Scope of duties (legal basis)
State that the aircraft maintenance technician’s duty includes:
- Verifying the physical condition of aircraft/equipment/parts under maintenance (Article 32).
- Verifying safe operation capability of light aircraft/equipment/parts after maintenance (Article 108, Paragraph 4).
Key memorization requirement
- Know Article 32, Paragraph 1
- Know Article 108, Paragraph 4
You do not need to memorize every item in the aviation safety regulations—only these two references.
2) Maintenance methods (letter checks and ISA)
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Letter checks are:
- Standardized, scheduled inspections
- Classified as A / B / C / D checks
- (Also mentions ISA.)
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ISA (as presented):
- An inspection focused on airframe structure, with emphasis on what affects/relates to the fuselage (internal structural inspection concept).
Emphasis
- Letter checks = standardized inspection method
- Memorize basic A/B/C/D concepts
- Treat ISA as a specific internal structural inspection concept
3) Sheet metal work (practical-exam focus; oral caveat)
- Green-marked items are for the practical exam.
- The oral exam typically won’t ask again unless special circumstances occur.
If asked about sheet metal work:
- Riveting / blind rivets
- Blind rivets are used when:
- Lateral access to structural components is impossible, or
- Limited space prevents using bucking feet
- Blind rivets are prohibited when:
- Areas requiring attention such as air intakes
- Control surfaces subjected to severe stress
- Inspection requirement:
- The pull must be periodically inspected
Answer framing (“key point”)
- Describe “blind” as referring to places needing attention, such as:
- Air intake areas
- Severe-stress control surface areas
- Loosening must be checked periodically
- Access from both sides is impossible
4) Connection work (practical-exam focus; ball bearing vs other)
Connection work refers to practical-exam items involving:
- Safety wire (e.g., “Tokina Safety Wire”)
- Or control cable tube work (terminology unclear in the subtitles)
If the candidate is asked about ball bearing work only:
- To identify the original material during tube replacement:
- Compare code markings on the replacement tubing with the original tube markings.
5) Aircraft material handling (FRP types)
Example FRP answer:
- FRP = Fiber Reinforced Plastic
- A fiber-reinforced plastic composite
Types mentioned include:
- glass fiber
- carbon fiber
- carbon FRP
- aramid FRP
- boron FRP
- polyethylene FRP, etc.
6) Airframe handling / Weight & Balance terms (oral-conditional)
The speaker treats this as Weight & Balance in the standard exam.
- If doing practical work, you may be able to skip it.
- If asked:
Definitions
- CG = Center of Gravity
- MAC
- A manufacturer-determined value
- A straight-line distance between the wing leading edge and a triangular edge, representing the theoretical center of lift across the wing
Conditional emphasis rule
- If Weight & Balance was not included in that day’s practical exam, expect oral questions about airframe handling.
7) Control system (transformer definition)
If asked what a transformer is in the aircraft control system:
- Converts movement of the control column into an electrical signal
- (Subtitle adds: converts kinetic energy into electrical energy)
Answer style
- Short-answer: brief and specific.
8) Fuel system (vent surge tank) + “trend”
If asked about a vent surge tank:
- Mounted on wingtips
- Fuel tanks are interconnected via vents
- Vents fuel vapor/fuel outward
- Prevents issues caused by excessive refueling during fuel supply
“Trend” (frequently asked):
- Described with a similar conversion concept (kinetic → electrical → electrical signal), as suggested by subtitles.
9) Hydraulic system (reservoir and “levator” / accumulator concept)
If asked about the reservoir purpose:
- Stores hydraulic fluid
- Replenishes supply after operation
- Replenishes leaked amounts
- Accounts for thermal expansion
“Space horsepower” is mentioned, followed by emphasis on:
- Levator/accumulator (subtitle suggests “levator” as a hydraulic accumulator/reservoir-like component)
Purpose (as stated)
- Not only storage, but:
- Supplies fluid to replace what is used in operation
- Provides safety against thermal expansion
Key phrasing: “storage safety” should be correct.
10) Landing gear (bungee spring function)
If asked what a bungee spring does:
- Essentially a “down lock”
- When lowered using aircraft weight + hydraulic power:
- Spring force causes it to lock down
Core point
- The locking-down function is the safety-critical concept.
11) Propulsion system (blade station / measurement points)
If asked “blade station”:
- Distance marked along the blade at 6-inch intervals from hub center
Key checklist (3 items)
- Performance at 6-inch intervals
- Location of damage for inspection/repair
- Measurement of blade angle
6-inch emphasis
- Mentioned as structural reference / measurement context (subtitles suggest analogy to control cable tension measurement).
12) Engine system (what to prepare / valve overlap)
If practical exam includes:
- Cylinder protection/compression-ring inspection
- No need to prepare in advance (per speaker)
If it is not included:
- Prepare for cylinder protection/compression rings inspection
Most important concept
- Valve overlap in a reciprocating engine and why it exists
Timing description
- Intake valve opens before top dead center during the exhaust stroke
- Exhaust valve opens at about 25° before top dead center
Purpose
- Increase the amount of fuel-air mixture drawn in
- Cool inside the cylinder by circulating the new mixture
13) “Aircraft handling” work recording (conditional readiness)
For items not included in practical exam:
- If work-order inspection and hand signal marshalling weren’t included:
- Be prepared for oral questions.
For sea trials / engine run-ups:
- If the run-up isn’t done according to the work order:
- Record details in the onboard aircraft log (as stated).
14) Laws & regulations (most frequent: 3 categories)
Most frequently asked:
- When aviation laws were divided and revised into three categories (speaker mentions 2017)
Three categories
- Aviation Safety Act
- Aviation Business Act
- Airport Facilities Act
Clarification
- Speaker notes confusion around “security laws”
- The National Security Act is not a Korean law (intended caution: don’t mix up laws).
15) Certificate related (Certificate of Probability)
“Certificate of Probability” (also described as an Airworthiness Probability Certificate; subtitles may mis-transcribe the name)
- A document where relevant authorities certify an aircraft’s performance / probability to fly safely.
Types
- Standard
- Special
16) Bench work (electrical protection devices)
Bench work includes tasks like:
- bolt knots (as approximated in subtitles),
- tubes,
- turnbuckles (subtitle approximations)
Electrical circuit protection devices (3 types):
- Fuse
- Cuts off current when it exceeds regulated capacity
- Circuit breaker
- Opens the circuit when current exceeds the regulated value
- Thermal protector / thermal switch
- Cuts current when the motor overheats
Answer quality tip
- In English, listing fuse / circuit breaker / thermal protector is sufficient.
17) Measurement work
- Measurement work is a practical task and appears every time (speaker emphasis).
Acronym-like naming
- “Precision measuring instrument” (PM) referred to with an approximation/mnemonic (likely PM)
Advice
- Since it appears every time, strict overly-detailed preparation is unnecessary.
18) Electrical work vs analog/digital (oral vs practical advice + basics)
- Electrical work
- Practical candidates: skip (since included every exam)
- Others: ensure to do it
Analog vs digital
- Analog circuit: continuously varying quantities (current/voltage), often represented as a sine wave
- Digital circuit: only two states (0 and 1)
- Uses state codes; each state corresponds to a bit (byte grouping suggested by subtitles, though phrasing varies)
19) Air conditioning unit (ACM temperature control)
- ACM = Air Cycle Unit
Temperature control methods:
- Zone Temp Controllers
- Pack Temp Controls
Key statement
- ACM temperature is controlled by regulating zones and packs.
20) Cabin system (Passenger Service Unit / PS)
PS system functions (short list):
- Reading lights
- Attendant call
- Emergency
- Oxygen mask
- Air outlet
Advice
- Keep it short; don’t provide long explanations.
21) Fire detection system (detector types)
If asked types of detectors:
- The emphasized type: overheat fire detector
Types mentioned (approximate list):
- overheat detector
- “rheo detector” (unclear spelling/meaning)
- frame detector
- carbon monoxide detector
Speaker suggests about five types.
22) Oxygen system (3 categories)
Aircraft oxygen system is divided into:
- Crew Oxygen System
- Passenger Oxygen System
- Portable Oxygen System
Advice
- Don’t overcomplicate—state these three.
23) Anti-freeze / de-icing (windshield de-icing control)
Windshield de-icing control method type mentioned:
- Regular electric (as written in subtitles)
Anti-freeze concept includes de-icing control.
24) Pneumatic vs chemical vs electric anti-ice systems (3-part framing)
Speaker simplifies anti-ice systems into:
- Electric
- Pneumatic
- Chemical
25) Communication & navigation (ADF and NDB)
ADF
- ADF = Automatic Direction Finder
- Receives omnidirectional radio waves from a ground station (omnidirectional beacon)
- Uses a loop antenna
- Indicates direction based on aircraft nose direction (direction to the NDB)
NDB
- NDB = direction finder
- Bearing/position concept
26) Electric lighting / generator frequency regulation (CSD)
CSD and the Generator Frequency Regulator ensure:
- AC power maintains constant voltage and frequency
- Mentions 3-phase 115V and a 400-cycle requirement
Key concept:
- Generator frequency changes with engine output and RPM.
- CSD is installed between shaft and generator to keep generator at:
- constant frequency
- constant RPM (approx. 8,000 RPM)
Advice
- Explaining how the Constant Speed Driver keeps generator frequency constant completes the answer.
27) Electronic instrumentation (requirements)
Instrument indicators should be:
- Lightweight and compact
- Durable and accurate
- Resistant to external conditions
- Minimal leakage
- Reduced friction at contact points
- Minimal impact from temperature fluctuations
- Protected against vibration
- Humidity-proof / heat-resistant
- Flame-retardant treatment against salt exposure
- Antibacterial treatment against mold (subtitle suggests antibacterial/antifungal concept)
Speakers / sources featured
- Speaker/Presenter: “Story” (presenter named only as “Story” in subtitles; no personal name given)
- Additional materials source: Naeilro Aviation Story
- Category: “Aircraft Maintenance Society”
- Institutional references (standards/laws):
- Aviation Personnel Qualification Practical Exam Standards
- Aviation safety regulations, including:
- Article 32 (Paragraph 1)
- Article 108 (Paragraph 4)
- Laws mentioned:
- Aviation Safety Act
- Aviation Business Act
- Airport Facilities Act
- National Security Act (mentioned as not applicable/mixed up)
Category
Educational
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