Pilot math

計數係惡夢 但方法還是有 🤭 Ref skybrary: https://skybrary.aero/articles/rules-thumb   時間 Time 6 mins 0.1 hour 3 mins 0.05 hour   方位 Reciprocal Heading = HDG +200 – 20 or = HDG – 200 + 20 大過200就- 先 ; 細過200就+ 先 e.g 090 : 90 + 200 – 20 = 270 270 : 270 – 200 + 20 Read More

這幾年我做人的格言 – MOTIVATION, SELF-DISCIPLINE

You can’t connect the dots looking forward, you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something – your gut, destiny life, karma whatever because believing that the dots will connect down the road will give you the confidence Read More

第240A章 《定額罰款(刑事訴訟)規例》 ── 附表

https://www.elegislation.gov.hk/hk/cap240A!zh-Hant-HK Read More

Airmanship -> Safetymanship -> Airmanship

由2012 到 2022+1, 11年了, 我發覺無論當初想做機師到家下做一個安全人員, 我初心不變, 希望自己每次睇自己既BLOG 都要提自己, 點解要入行… 呢樣野由Day 1 到我退休都不應該變~ Read More

香港法律: 條例及規例一覽 (List of Hong Kong Legislation: Ordinance and Regulation)

#職安例 #OSHO #F&IUO #職安健 #法例   到底有沒有列表有曬所有香港法例 (主體條例及附屬規例)呢? 答案係有嫁! ↓ 中文: https://www.elegislation.gov.hk/index/chapternumber?p0=1&TYPE=1&TYPE=2&TYPE=3&LANGUAGE=C OR 英文: https://www.elegislation.gov.hk/index/chapternumber?p0=1&TYPE=1&TYPE=2&TYPE=3&LANGUAGE=E (接一下 “全部” 或 “All” )   OSH相關的例: 59 《工廠及工業經營條例》 59A 《工廠及工業經營規例》 59C 《工廠及工業經營(噴砂打磨)特別規例》 59D 《工廠及工業經營(應呈報工場的急救設備)規例》 59E 《工廠及工業經營(職業病呈報)規例》 59F 《石礦場(安全)規例》 59G 《工廠及工業經營(木工機械)規例》 59H 《工廠及工業經營(電解鉻工序)規例》 59I 《建築地盤(安全)規例》 59J 《工廠及工業經營(起重機械及起重裝置)規例》 59K 《工廠及工業經營(貨物搬運及貨櫃處理作業)規例》 59L 《工廠及工業經營(砂輪)規例》 59M 《工廠及工業經營(在壓縮空氣中工作)規例》 59N 《工廠及工業經營(易燃液體的噴塗)規例》 59O 《工廠及工業經營(載貨升降機)規例》 59P 《工廠及工業經營(乾電池)規例》 59Q Read More

Camshaft, Crankshaft, rpm?

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What’s glide ratio?

Ref FTA material, Skybrary https://skybrary.aero/articles/glide-performance#:~:text=Description,altitude%20lost%20in%20that%20distance.     The glide ratio for the DA40 is approximately 10:1 What’s glide ratio? The Glide ratio of an aircraft is the distance of forward travel divided by the altitude lost in that distance. (It is talking about same unit~)   Below is another example: For every 1.45 NM (2.68km Read More

bank angle and descent angle 證明本書點解d 角度可調位

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What’s Entity

https://corporatefinanceinstitute.com/resources/management/entity/ Entity An organization created by one or more individuals to carry out the functions of a business and maintains a separate legal existence for tax purposes Read More

Hot topic : Turbofan Engine

How does a turbofan engine work? https://aeroreport.de/en/video/wie-funktioniert-ein-turbofan-triebwerk Air is ingested, compressed, combusted and then expelled.  The GE90-115B on B777-300ER Gearbox Turbofan Engine ? https://aeroreport.de/en/good-to-know/wie-funktioniert-ein-turbofan-triebwerk-aufbau-eines-triebwerk In conventional engines, the low-pressure turbine and the fan sit on one shaft, but here the gearbox decouples the two components. This lets the components run at their optimum speed: the Read More

The properties of air

Ref Ref FAA-H-8083-25C version 2023 Air is fluid To describe the properties of air, we need to know various key terminology at the beginning Viscosity Friction Pressure Density Temperature   Viscosity “friction” of fluid is used to describe the resistance of flowing high viscosity means “thick” and resist flowing low viscosity means “thin” and flow Read More

Vx, Vy, Vcc

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一次搞清楚Ceiling

Ref FAA-H-8083-25C version 2023 5-24, 7-12, 11-8,12-17 Ceiling related to metrology? Ceiling is the lowest layer of clouds reported as being broken (5/8) or overcast (8/8) OR the vertical visibility into an obscuration like fog or haze     Ceiling related aircraft performance? absolute ceiling : the altitude at which the aircraft has no excess Read More

When the air is stable?

Ref: https://skybrary.aero/articles/lapse-rate 到底咩情況下parcel of air 叫stable? To answer this question, we need understand few concept: 咩係Lapse rate 咩係環境上面既Lapse rate 咩係pacel of air 既Lapse rate   Lapse Rate is the rate at which temperature changes with height in the Atmosphere. In my language, how many degree Celsius drop when vertical distance increase for a fixed number.   Read More

Monsoon in Arizona

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Airport code and Aircraft Registration

What is the difference between ICAO airport code and IATA airport code? For example, Hong Kong IATA: HKG ICAO: VHHH   Ans ref: POE ICAO codes are used for aviation-related operational and safety purposes, while IATA codes are mainly used for commercial and airline-related activities. ICAO codes are four-letter alphanumeric codes; IATA codes are three-letter Read More

What’s Monsoon Wind ; Why Monsoon blow from north east in winter and southwest in summer?

Ref: https://www.hko.gov.hk/en/publica/gen_pub/files/sms_Urdu.pdf https://www.hko.gov.hk/en/education/weather/meteorology-basics/00010-geostrophic-wind.html https://www.hko.gov.hk/en/education/weather/monsoons/00068-why-the-winter-monsoon-in-hong-kong-is-generally-called-the-northeast-monsoon.html   所謂季候風就係會隨著季節改變既風, 但光是研究呢個季候風既風向都搞左我粒幾鐘, 因為背後講緊既CONCEPT 有好幾個: 咩叫High pressure system, 咩叫Low pressure system 咩係風 咩叫Coriolis effect (科里奧利力/科科氏力) 咩叫Geostrophic Wind (地轉風)   想簡單D咁理解就要背少少野 (明白少少基本CONCEPT) High, Low pressure system 是相對 (relative) : compare one air mass with another one 仲要記得通常凍就係有高壓區, 熱就係有低壓區~ 風就是due to two air mass has pressure difference and so the pressure gradient as Read More

Pilot sharing and group work

This evening, I deeply thanks that a pilot shared with us by using scenario and group work. Let me briefly type what I have learnt this evening ~ CLEAR model Clarify the issue or question – ident problem Look for options Evaluate the options – factors including safety, legality, pax comfort, OTP and Cost. Action Read More

2024-2025 I will, I am going to achieve it!

齊腳, Fly beyond! 2024-2025 I will, I am going to achieve it! 2024-2025 We will, We are going to achieve it! Read More

ETOPS ? EDTO?

https://www.flightglobal.com/cathay-etops-okay/10579.article The timestamp of this article disclosed that CX A330 has already obtained ETOPS 120 in 1996. https://simpleflying.com/etops-banned-areas/ This article gave us some background information about ETOPS, and told us one of the reasons why B747 was popular in 1980s: Before 1985, all twin aircraft had to remain within 60 minutes of a suitable diversion airport. This Read More

Any formula to proof that local speed of sound decrease with altitude increases?

Reference: POE – AI Yes, there are formulas that can help explain why the local speed of sound decreases with higher altitude. The speed of sound is determined by the properties of the medium through which it travels, such as temperature, pressure, and density. One important formula is the adiabatic equation of state for an Read More

Tropical of Cancer

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Vx, Vy, Vcc

let me x-check the book later, but it makes sense as I remember Read More

口訣勿背錯: True Direction – Magnetic Direction – Compress Direction

Magnetic Direction 東減西加 轉 Compress Magnetic Direction 東加西減 轉 True   Tommy = M+E C = M-E (我無左E就係死屍)   Read More

What’s coffin corner?

Reference:https://airwaysmag.com/coffin-corner-aviation/ , https://www.boldmethod.com/learn-to-fly/aerodynamics/coffin-corner-where-vne-and-mmo-meet/ Ans: Coffin Corner can be explained by using below illustration. It is talking about when when the aircraft fly to an altitude where the aircraft reduces the speed, it will stall while the aircraft increase its speed, it will over the Mmo. Therefore, the margin for error is low.The coffin corner is Read More

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