What’s “dorsal fin”?

[Ref Youtube] The more powerful the engine, the bigger the fin and rudder are needed to counteract the aerodynamic force during engine failure situation. However, the bigger and higher fin may be oversize and cannot be fitted into a hanger. Therefore, manufacture can use the dorsal fin. Dorsal fin doesn’t intersect straight into the airframe, […]

What’s Dangerous Goods?

[Ref IATA DG Class 10 Learning Kit] Dangerous goods are articles or substances which are capable of posing a hazard to health, safety, property or the environment. Read More – Who establishes the criteria and What’s the Legal Basis? The United Nations (UN) Subcommittee of Experts on the Transport of Dangerous Goods establishes the criteria […]

(Engine) Roughness

[Ref. Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 7-9, 7-19] Roughness normally is due to spark plug fouling; Both over-rich or over-lean mixture can cause engine roughness   Over-rich mixture induced roughness?! Why it happens? (over-rich mixture → excessive carbon buildup → spark plug fouling → roughness) Roughness is normally caused by over-rich mixture, which […]