Q&A Forum
Ask a question1,113 questions · 1,914 answers · 460 members contributing
EASA MODULES
1. Mathematics Arithmetic · Algebra · Geometry
160 threads 5 Mar 2026 · SirPitz
2. Physics Matter · Mechanics · Thermodynamics · Optics (Light) · Wave Motion and Sound
135 threads 12 Aug 2026 · PART66Online
3. Electrical fundamentals DC Circuits & Power · Capacitance, Magnetism & Inductance · DC Machines & AC Theory · Transformers, Filters & AC Machines
156 threads 1 Jul 2026 · Marek_AME
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
51 threads 5 Jun 2026 · Devraj_S
6. Materials & hardware Ferrous Materials · Non-Ferrous Materials · Composites & Corrosion · Fasteners & Hardware · Pipes, Bearings & Cables
62 threads 9 Jun 2026 · Ody balsa
7. Maintenance practices Safety Precautions · Tools · Electrical Wiring (EWIS) · Riveting · Inspection & NDI
47 threads 12 Jun 2026 · Rhysfaulkner96
8. Basic aerodynamics Physics of the Atmosphere · Aerodynamics · Theory of Flight · Flight Stability and Dynamics
129 threads 4 Jun 2026 · Merejohn
9. Human factors Human Error & Just Culture · Human Performance & Limitations · Communication & Teamwork · Performance Factors & Environment
30 threads 25 Aug 2026 · svenj88
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
75 threads 22 Aug 2026 · khalidjat
12. Helicopter aerodynamics, structures and systems Rotary Wing Aerodynamics · Flight Control Systems · Transmissions · Airframe Structures · Hydraulic Power
22 threads 6 Oct 2025 · Majorkidkid
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
63 threads 1 Oct 2025 · c.stravopodis
16. Piston engine Fundamentals · Performance & Induction · Fuel & Carburettors · Ignition & Starting · Lubrication
1 thread 2 days ago · PART66Online
17. Propeller Fundamentals & Construction · Pitch Control · Synchronising · Ice Protection · Maintenance & Storage
35 threads 16 Aug 2026 · PART66Online
GENERAL DISCUSSION
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Experience & Logbook Practical experience requirements, logbooks and on-the-job training. No threads yet
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Type Ratings Aircraft type training, type examinations and type question banks. No threads yet
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Working Abroad Licence recognition and conversion outside EASA. No threads yet
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RECENT ACTIVITY
J
This question is worded badly. If the mixture is set lean of peak, the cylinder head temperature will decrease, NOT increase. "too lean" is very ambiguous. Please be more precise in the wording!
on “What condition results from running the engine at high power with the mixture leaner than the engine manual specifies?”
jon@efm.ltd · 16. Piston engine · 1 reply · 2 days ago
W
#1 being wrong is it because of the missing of keywords?
on “The aim of a human factors programme within an organisation is”
wan.yc.justin · 9. Human factors · 1 reply · 25 Aug 2026
K
2 dots equals 4 degrees. Each point represent 2 degrees and full deflection is 10 degrees
on “What deviation is indicated by 2 dots in a VOR system?”
khalidjat · 11. Aeroplane aerodynamics, structures and systems · 0 replies · 22 Aug 2026
J
What about a king air 200? The power control lever only operates the FCU via the connecting rod. The prop is controlled via a separate lever. That lever only controls the primary governor. So this question is not accurate. Not all aircraft have FADEC! A&B can be correct for this question so maybe it should read "on a modern turboprop aircraft the power lever controls?"
on “On a modern single lever turboprop, the power lever controls:”
josh93 · 17. Propeller · 1 reply · 16 Aug 2026
B
Formula = 2n^2 (where n = Shell #)
on “The maximum number of electrons in the second shell is”
BurtoJ · 2. Physics · 1 reply · 12 Aug 2026
A
seguridadaerea.gob.es/sites/default/f... PAGE 13 3 months , (90 days) before licence expires.
on “How far before expiry may a Part-66 aircraft maintenance licence renewal application be submitted?”
ALEX LORENCIO · 10. Aviation legislation · 1 reply · 3 Aug 2026
G
Hello , i am thinking that the correct answer in this question is 181 degrees .If the deviation is +1 dergee that means that if the compas heading to 181 degrees the arcraft goes heading 180 degrees ( 181 degrees - (+1) degree = 180 degrees). On the other hand if the pilot steer to 179 degree the compass will show 180 degree but the plane would travel too 179 degrees . Is this right or am i wrong to somehtink? thank you for your time , George
on “A compass has a residual deviation of +1 degree. To fly a heading of 180 degrees the pilot must steer”
GEO9816 · 11. Aeroplane aerodynamics, structures and systems · 1 reply · 2 Aug 2026
J
The PT6 starts with the blades in feather?
on “Propeller control during engine start:”
JayACA · 17. Propeller · 1 reply · 23 Jul 2026
T
why is this here (coming from CASA system) this is a buit random
on “The temperature of boiling water at standard pressure on the Fahrenheit and Centigrade scale is”
Tj Anderson · 2. Physics · 1 reply · 18 Jul 2026
U
Class C is specially designed for RF and only that and can't be used for audio
on “The most suitable class of amplifier for a high fidelity radio transmitter is”
udreacc · 4. Electronic fundamentals · 1 reply · 8 Jul 2026