[Ref Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 12-16] What’s “extensive vertical development”? Cloud with extensive vertical development refers to two types of cloud – Towering cumulus (TCU) Cumulonimbus (CB) #Clouds #with #extensive #vertical #development
Category: Definition / Terminology / Jargon
Cumulonimbus (CB)
[Ref Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25B Page 12-16] Cumulonimbus (CB) is a type of cloud with extensive vertical development and is perhaps the most dangerous cloud type – indeed, CB is a type of clouds of operational significance (對飛行有重要影響的雲) CB appears individually or in groups and is known as either an air mass or orographic thunderstorm: […]
What’s thermal runaway?
[Ref SKYbrary] What’s thermal runAway? (p.s NOT thermal runway!!!) Thermal runaway is a situation that occurs when an increase in temperature changes the conditions of a reaction in a way that causes a further increase in temperature – It is a kind of uncontrolled positive feedback. In other words, if a process is accelerated by an increase […]
What’s “Liner”?
[Ref Aviation Maintenance Technician Handbook–Airframe, Volume 2 (FAA-H-8083-31A) Chapter 17, AERO QTR_02.11, FAA AC No: 25.857-1] What’s “Liner/ Liners”? Liner is the inner sidewall have sufficient fire integrity and separate from the aircraft structure You may see “liner” in the topic of fire protection system. In AERO QTR_02.11: Liners – The liner must be separate from (but may […]
What’s VMCG/VMCA?
[Ref the Internet] What’s VMCG/VMCA? VMCG VMCG is the minimum speed on the ground during take-off, at which the aircraft can be controlled by the use of the primary flight controls only, after a sudden failure of the critical engine, with the other engine(s) remaining at take-off thrust. VMCA VMCA is the minimum control speed in flight […]
What’s V2, Vref?
[Ref CAD 385] What’s V2 (take-off phase)? According HK CAD 385 V2 is Take-off Safety Speed V2 -The target speed to be attained at the 35 foot (feet) height, assuming recognition of an engine failure at or after V1 Take-off Speeds Relationship In order to satisfy JAR, depending on the aircraft type: V2 should not be […]
What’s Vr, Vmu, Vlof? (Speed)
[Ref CAD 385] What’s Vr? Vr is the Rotation Speed Vr – the speed at which the pilot initiates action to raise the nose gear off the ground, during the acceleration to V2 at a height of 35 ft. What’s Vmu? Minimum Unstick Speed, Vmu – the calibrated airspeed at and above which the aeroplane […]
What is “Screen height”?
[Ref ACE The Technical Pilot Interview 186/348, CAD 385, CASA] What’s “Screen Height”? Screen Height is the height of an imaginary screen which the aeroplane would just clear when taking off or landing in an unbanked attitude with landing gear extended. – According to HK CAD 385 – Appendix 2 (Definitions) Information from unofficial material, “screen height” […]
Runaway stabilizer
[Ref ACE The Technical Pilot Interview 43/348] Runaway Stabilizer happens when the stabilizer does not stop at the required point. It indicates by unusual rotation of the stabilizer to its maximum upward or downward mechanical stops, thereby inducing a marked out-of-trim unstable condition. Each aircraft type should has its own drill, but in general : Autopilot (if engaged), […]
Compressibility
[Ref ACE The Technical Pilot Interview 24/348] What’s compressibility? Air being compressed onto a surface (at a right angle to the relative airflow), resulting in an increase in density, and thus dynamic pressure rises above its expected value. When will the compressibility become significant? At “force divergence Mach number” – above 5-10% Mcrit (critical Mach […]