Q&A Forum
Ask a question1,141 questions · 1,946 answers · 463 members contributing
EASA MODULES
1. Mathematics Arithmetic · Algebra · Geometry
163 threads 5 days ago · PART66Online
2. Physics Matter · Mechanics · Thermodynamics · Optics (Light) · Wave Motion and Sound
139 threads 6 days ago · PART66Online
3. Electrical fundamentals DC Circuits & Power · Capacitance, Magnetism & Inductance · DC Machines & AC Theory · Transformers, Filters & AC Machines
157 threads 21 Sep 2026 · PART66Online
4. Electronic fundamentals Diodes · Transistors · Integrated Circuits · Printed Circuit Boards · Servomechanisms
27 threads 8 Jul 2026 · Marek_AME
5. Digital techniques / Electronic instrument systems Electronic Instrument Systems · Numbering Systems · Data Conversion · Data Buses · Logic, Computers & Displays
52 threads 9 Oct 2026 · PART66Online
6. Materials & hardware Ferrous Materials · Non-Ferrous Materials · Composites & Corrosion · Fasteners & Hardware · Pipes, Bearings & Cables
63 threads 20 Oct 2026 · svenj88
7. Maintenance practices Safety Precautions · Tools · Electrical Wiring (EWIS) · Riveting · Inspection & NDI
48 threads 15 Oct 2026 · svenj88
8. Basic aerodynamics Physics of the Atmosphere · Aerodynamics · Theory of Flight · Flight Stability and Dynamics
132 threads 1 day ago · svenj88
9. Human factors Human Error & Just Culture · Human Performance & Limitations · Communication & Teamwork · Performance Factors & Environment
31 threads 3 Oct 2026 · PART66Online
10. Aviation legislation Regulatory Framework · Certifying Staff · Maintenance Organisations · Air Operations · Continuing Airworthiness
35 threads 3 Aug 2026 · PART66Online
11. Aeroplane aerodynamics, structures and systems Theory of Flight · Airframe Structures · Hydraulics & Landing Gear · Air, Fuel & Environmental Systems · Electrical & Avionics
76 threads 24 Oct 2026 · PART66Online
12. Helicopter aerodynamics, structures and systems Rotary Wing Aerodynamics · Flight Control Systems · Transmissions · Airframe Structures · Hydraulic Power
29 threads 5 days ago · PART66Online
13. Aircraft aerodynamics, structures and systems Electrical Power · Instruments · Communication / Navigation · Autoflight · Integrated Modular Avionics
60 threads 23 Mar 2026 · huly
14. Propulsion Engines · Engine Control · Engine Indication · Propeller Systems · Starting & Ignition
25 threads 11 Feb 2026 · Spaceresearcher
15. Gas turbine engine Fundamentals & Performance · Intake & Compressor · Combustion Section · Turbine & Exhaust · Indications, Monitoring & FOD
65 threads 29 Sep 2026 · PART66Online
16. Piston engine Fundamentals · Performance & Induction · Fuel & Carburettors · Ignition & Starting · Lubrication
1 thread 2 Sep 2026 · PART66Online
17. Propeller Fundamentals & Construction · Pitch Control · Synchronising · Ice Protection · Maintenance & Storage
35 threads 16 Aug 2026 · PART66Online
18. Electric power plant Fundamentals and Performance · Engine Construction · Batteries and Fuel Cells · Distribution and Control · Indication, Installation and Operation No threads yet
0 threads
10. Aviation legislation (UK CAA) Regulatory Framework · Certifying Staff - Maintenance · Approved Maintenance Organisations · Air operations · Certification of aircraft, parts and appliances: General · Certification of aircraft, parts and appliances: Documents · Continuing airworthiness · Applicable National and International Requirements (a) · Applicable National and International Requirements (b) No threads yet
0 threads
GENERAL DISCUSSION
Exams & Revision Sitting the exams, pass marks, negative marking and revision tactics.
2 threads 17 Oct 2026 · Lisa_T
Licensing & Categories Licence categories A, B1, B2 and B3, applications and extensions. No threads yet
0 threads
Experience & Logbook Practical experience requirements, logbooks and on-the-job training. No threads yet
0 threads
Type Ratings Aircraft type training, type examinations and type question banks. No threads yet
0 threads
Working Abroad Licence recognition and conversion outside EASA. No threads yet
0 threads
RECENT ACTIVITY
O
Shouldn't it be both supersonic region and transonic region? Wave drag is a consequence of the formation of shock waves. This is wrong it should retard the movement of an airplane forward in both supersonic and transonic flight.
on “Wave drag”
olehenrikgjevenes · 8. Basic aerodynamics · 1 reply · 1 day ago
K
Why pi/4 and not just pi. It is about the area right?
on “A circular pipe has an external diameter of 100 mm and internal diameter of 80 mm. What is the cross-sectional area of the metal?”
kpaximadakes · 1. Mathematics · 1 reply · 5 days ago
K
Sagging (bending downwards in the middle) sound correct for fixed wing fuselage. But for a tail boom to sag, wouldn't that mean the aft end is "bending" / sagging, not the middle part? In this case the wrinkling will be at the bottom surface of the boom.
on “Wrinkling of the skin on the upper surface of the tail boom indicates”
kenguan76 · 12. Helicopter aerodynamics, structures and systems · 1 reply · 5 days ago
K
Between conductive paint and bonding, I would go for bonding as the better answer, since I think conductive paint is more suited for preventing potential difference, while bonding is for preventing potential difference as well as able to conduct lightning strikes better than conductive paint
on “Helicopter fibreglass panels are protected against lightning strikes, partially by”
kenguan76 · 12. Helicopter aerodynamics, structures and systems · 1 reply · 5 days ago
S
Reference for this answer? The answer of rovided is not specific to the point.
on “How is the MLG retract actuator accessed for maintenance?”
stevegrafe · 32 - Landing Gear, Wheels & Brakes · 1 reply · 5 days ago
E
The question is not understandeble in my apinion
on “A hydraulic jack has a piston rod (ram) on one side of the piston only. Fluid at equal pressure is applied to both sides of the piston. What happens?”
elitair · 2. Physics · 2 replies · 6 days ago
E
eksternt arbeid indikere en ekstern mekanisk del var der. Men det er en mekanisk del inne i systemet som gjre jobben. Det som er ekstern er energien som kommer inn som strm. Eller tar jeg feil?
on “A heat pump:”
elitair · 2. Physics · 1 reply · 28 Oct 2026
D
there is no explanation as to why c is the correct answer.
on “On an aircraft with an all-moving tailplane, pitch up is caused by”
dimitriskivaris · 11. Aeroplane aerodynamics, structures and systems · 1 reply · 24 Oct 2026
K
I don't understand why in answer A. and in the explanation it states that there will be a "roll to the advancing blade side". If the retreating blade stalls, the effect should be felt 90deg later which is the rear of the helicopter, thus the pitch up. If there is any roll I would assume it will be to the left side since the right side (advancing blade) has not stalled.
on “Retreating blade stall symptoms in a helicopter typically include:”
kenguan76 · 12. Helicopter aerodynamics, structures and systems · 1 reply · 21 Oct 2026
B
is it 1,. times or 2.0 the working pressure?
on “How would you test a hydraulic hose?”
bonyo · 6. Materials & hardware · 1 reply · 20 Oct 2026