AVI8 Consulting

✈️ CRACKING THE CODE: What’s a METAR?

Ever seen a string like this and wondered what it means?

METAR YPPH 091000Z 32015KT 9999 FEW030 SCT040 28/16 Q1012 NOSIG

This is a METAR (Meteorological Aerodrome Report) – a real-time weather snapshot Flight Crew and ATC rely on!

Let’s break it down:

🌤️ METAR DECODED:

📍 YPPH → Perth International Airport
📅 091000Z → 9th day, 10:00 UTC
🌬️ 32015KT → Wind 320° at 15 knots
👀 9999 → Visibility 10km+ (CAVOK)
☁️ FEW030 SCT040 → Few clouds at 3,000ft, scattered at 4,000ft
🌡️ 28/16 → Temp 28°C, Dew Point 16°C
📊 Q1012 → Pressure 1012 hPa
🔄 NOSIG → No significant change expected

💡 Why METAR’s Matter!
✔️ Updated hourly (or every 30 mins at busy airports).
✔️ Essential for flight planning, takeoffs & landings.
✔️ Used by Flight Crew, ATC & Meterologists worldwide.

Next time you check your flight weather, you’ll know what’s behind the code! ✈️

Bureau of Meteorology

💡 Runway Lighting Systems: Guiding Pilots both Day & Night!

Runway lighting systems are essential for safe aircraft operations, especially during night, low visibility or adverse weather. These lights help pilots identify runway boundaries, align approaches and safely land or take off.

🛫 Types of Runway Lighting Systems

🔹 Runway Edge Lights

* White lights outlining the runway edges;
* Amber lights replace white near the departure end (last 2,000 ft or half the runway length) for caution.

🔹 Runway Centerline Lights

* In-runway white lights spaced at regular intervals;
* Alternate red/white near the end, then solid red in the final 1,000 ft.

🔹 Touchdown Zone Lights (TDZL)

* Rows of white lights on either side of the centreline;
* Extend 3,000 ft from the threshold or to the runway midpoint (whichever is shorter).

🔹 Runway End Identifier Lights (REIL’s)

* Pair of synchronized flashing white lights on each side of the runway threshold;
* Increase visibility of runway ends from a distance.

🔹 Threshold Lights

* Green lights marking the beginning of the usable runway;
* Viewed red from the opposite end, signaling the runway's end.

✈️ Approach Lighting Systems (ALS)

Approach lighting systems extend beyond the runway to help pilots transition from instrument flying to visual landing:

* MALSR / ALSF / SSALR: Include strobes, sequenced flashing lights, and steady-burning lights in varying configurations;
* Provide runway alignment and descent guidance during final approach.

📐 Taxiway Lighting (for reference)

* Blue edge lights;
* Green centerline lights;
* Assist aircraft to move safely on the ground at night or in low visibility.

🧠 Pilot Tips

* Know the lighting cues for runway length remaining;
* Recognize centreline red lights as your cue to prepare for stopping or rotation;
* Understand that lighting may vary depending on airport class and precision approach needs.

🔗 Relevant Hashtags

Wind velocity has both direction and speed.

Surface wind is the wind blowing near the
Earth’s surface.

Wind is generated by the pressure differences
between high and low-pressure systems, which
give rise to what we call the pressure gradient
force (PGF) i.e. the change of pressure over
distance. The PGF acts directly from high
pressure to low pressure.

Wind direction is always given as the direction
from which the wind is blowing. It is normally
given in degrees true, however, wind direction given to a pilot by ATC and ATIS will be given in
degrees magnetic.

Bureau of Meteorology

Something to remember for those flying Constant Speed Unit equipped Aircraft 👌🏻

Understanding Turns: Coordinated, Slipping, and Skidding Turns explained in detail.

1️⃣ Coordinated Turn

Description:

A coordinated turn occurs when the aircraft’s ailerons and rudder are perfectly balanced, resulting in a smooth, stable turn. In this scenario, the aircraft’s lateral (side-to-side) and yawing (nose movement) forces are in harmony, causing passengers to feel evenly supported in their seats without being pushed to either side.

What’s Happening:

• The aileron controls the roll of the aircraft.
• The rudder counteracts the adverse yaw (the tendency of the nose to swing opposite to the turn).
• The turn coordinator shows the ball centered, indicating perfect balance.

Why It Matters:

Coordinated turns are essential for safety and comfort. They minimize stress on the airframe and provide the most efficient aerodynamic performance.

⸻

2️⃣ Slipping Turn

Description:

A slipping turn occurs when there is not enough rudder input relative to the aileron. The airplane begins to slide inward during the turn because the nose is not yawing into the turn fast enough.

What’s Happening:

• The airplane’s bank angle is too steep for the rate of yaw.
• The ball in the turn coordinator drifts toward the inside of the turn.
• The rudder is not applied enough or is out of sync with the aileron input.

Why It Matters:

Slips can be used deliberately to lose altitude without increasing speed (e.g., during landing), but unintentional slips can lead to inefficient flight and control issues.

⸻

3️⃣ Skidding Turn

Description:

A skidding turn is the opposite of a slip. It occurs when too much rudder is applied relative to the bank. The nose of the aircraft is yawing faster than the bank supports, causing the aircraft to “slide” outward in the turn.

What’s Happening:

• The rudder is over-applied compared to the aileron.
• The ball in the turn coordinator moves to the outside of the turn.
• The airplane yaws faster than the turn requires.

Why It Matters:

Skids are dangerous, especially at low speeds or in base-to-final turns, as they can lead to overbanking and stall-spin scenarios. Proper coordination is critical for safe maneuvering.

⸻

In Summary:

• ✅ Coordinated Turn = Balanced and efficient (ball centered).
• ⚠️ Slipping Turn = Not enough rudder (ball inside the turn).
• ⚠️ Skidding Turn = Too much rudder (ball outside the turn).

Always use the turn coordinator and feel of the aircraft to ensure proper turn coordination — it’s key to smooth, safe, and controlled flight. 🛩️

🛰️ Understanding RAIM – GPS Integrity Monitoring in Aviation 🛰️

RAIM is a critical feature in GPS-based navigation systems that ensures signal integrity by identifying faulty satellite data.

Key Concepts:

• Requires 5 or more satellites to detect anomalies (RAIM FD).
• Needs 6 or more to exclude the faulty signal and continue safely (RAIM FDE).
• If a range anomaly is detected, the system either alerts the pilot or eliminates the faulty satellite to maintain safe navigation.

💡 RAIM helps ensure precision and trust in GNSS-based procedures like RNAV and RNP, especially in non-radar environments.

Crosswind and Headwind Component Chart ✈️

Every aircraft is tested according to Federal Aviation Administration (FAA) Regulations prior to certification. The aircraft is tested by a pilot with average piloting skills in 90° crosswinds with a velocity up to 0.2 VS0 or two-tenths of the aircraft’s stalling speed with power off, gear down, and flaps down. This means that if the stalling speed of the aircraft is 45 knots, it must be capable of landing in a 9-knot, 90° crosswind.

The maximum demonstrated crosswind component is published in the Aircraft Flight Manual (AFM) and Pilot’s Operating Handbook (POH).

The crosswind and headwind component chart below allows for figuring the headwind and crosswind component for any given wind direction and velocity.

Sample Problem:

Runway 17, Wind 140° at 25 knots

Refer to the image above to solve this problem.

1. Firstly, determine how many degrees difference there is between the runway and the wind direction. It is known that Runway 17 means a direction of 170°. From that subtract the wind direction of 140°. This gives a 30° angular difference or wind angle.

2. Secondly, locate the 30° mark and draw a line from there until it intersects the correct wind velocity of 25 knots.

3. Finally, draw a line straight down and a line straight across. The headwind component is 22 knots and the crosswind component is 13 knots.

This information is important when taking off and landing so that, firstly, the appropriate runway can be picked (if more than one exists at a particular airport), but secondly, so that the aircraft is not flown beyond its tested limits.

Pilot’s Limits v Published/Tested Limits:

Each pilot should set their own personal limits which are adjusted based on skill and comfort levels. Published limits should never be exceeded, however, personal limits may often be lower/conservative based on pilot’s own assessment of comfort/experience level.

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✈️ What Does AOG mean?

AOG is a term used in aviation maintenance and operations to indicate that an aircraft is grounded due to a technical issue and cannot fly until the problem is resolved. It's considered a high-priority status, often triggering an urgent response to minimize downtime.

🛠️ When is AOG declared?

AOG is declared when:

▪️A critical component has failed.

▪️There is a system malfunction that affects airworthiness.

▪️Required maintenance cannot be deferred.

▪️The aircraft is not compliant with operational or regulatory standards.

⚡ Why is AOG critical?

▪️Delays operations and disrupts flight schedules.

▪️Costly for operators due to lost revenue and potential penalties.

▪️Often leads to emergency maintenance actions and priority logistics for parts and support.

🔧 AOG response may involve:

▪️Priority parts shipment (couriers, charters, etc.)

▪️Dispatch of maintenance teams or engineers.

▪️Coordination between MROs, OEMs, and logistics providers.

▪️Temporary aircraft swaps or rerouting.

🛬 Example Usage:

"We’ve got an AOG situation in Perth — awaiting the replacement starter generator from the warehouse in Frankfurt."



7NEWS Perth 9 News Perth The West Australian 10 News First Perth ABC Perth WAtoday.com.au 7NEWS Australia 9 News 10 News First ABC News PerthNow 6PR Perth

Cleared to Taxi, give way to the Medivac Jet... ✈️



Cessna Royal Aero Club of WA Royal Flying Doctor Service of Australia WA Aviation College

Here at we are always expanding our Aviation knowledge! ✈️