Aviation-knowledge

Ethiopian Airlines is considering a new aircraft order that could include six Airbus A350 widebody jets and up to 20 Airbus A220 aircraft, as part of its strategy to expand both long‑haul and regional operations. If finalized, the deal would mark Ethiopian’s first acquisition of the A220, adding a new aircraft type to its fleet.

The airline is already one of the world’s largest A350 operators, with 26 aircraft in service and more on order. Additional A350s would strengthen its long‑haul network, while the smaller A220s would provide flexibility for regional routes and thinner markets across Africa.

The potential order aligns with Ethiopian Airlines’ ambition to become a major global connector, supported by fleet growth, recent Boeing 787‑9 purchases, and investment in Addis Ababa’s new Bishoftu International Airport, a key pillar of its long‑term expansion strategy.

Ever wondered what the numbers on a runway actually mean?

Most people think a runway is just a long strip of concrete.

It’s not. It’s a precisely oriented piece of infrastructure — numbered by magnetic compass heading, designed around wind patterns, and coordinated in real time between pilots, controllers, and ground teams across every single movement.

Runway 05/23. Two digits. Two directions. One global standard — designed so there’s only one way to read it, everywhere in the world.

What strikes me most is how much engineering, physics, and human coordination sits behind what passengers see as just “the runway.”

In aviation, nothing is simple. It’s just made to look that way.

Familiar with the type ?!

Boeing still leads Airbus for aircraft deliveries in 2026, but its lead has narrowed after the European manufacturer outpaced its US rival last month.

On May 12, 2026, Boeing updated its orders and deliveries data which also revealed a surprising number of aircraft purchases from as yet unidentified customers.

✈️ Altimeter settings

The basic idea

An altimeter measures air pressure, not height directly.
Because air pressure changes with weather, pilots adjust the altimeter using a pressure setting.

Different settings answer different questions:

“How high am I above sea level?”

“How high am I above the airport?”

“What is my flight level?”

“What would sea-level pressure be after weather correction?”

🔵 QNH

QNH = Altitude above mean sea level

When you set QNH, the altimeter shows:

the airport elevation when sitting on the runway

your altitude above sea level when flying

Example:

Airport elevation = 500 ft

Set local QNH

Altimeter on ground reads 500 ft

This is the most common setting for normal flying near the ground.

Simple memory trick

QNH = “Normal height” above sea level

🟢 QFE

QFE = Height above the airfield

When you set QFE:

the altimeter reads 0 ft on the runway

in flight it shows height above that airport

Example:

Take off

Altimeter says 1,000 ft

You are 1,000 ft above the airport

Used less today, but sometimes in military flying or traffic patterns.

Simple memory trick

QFE = “Field elevation zero”

🟡 QNE

QNE = Standard pressure setting

This means setting the altimeter to the international standard pressure:

1013.25 \text{ hPa}

(or 29.92 inHg in the US)

With this setting, aircraft use Flight Levels instead of true altitude.

Example:

FL100 = about 10,000 ft on standard pressure

This keeps all aircraft using the same reference high up in the sky.

Why?

Weather pressure differs between regions.
Using one common pressure avoids vertical separation problems.

Simple memory trick

QNE = “Everyone uses the same pressure”

🔴Standard setting

“Standard setting” is basically the same thing as QNE:

1013.25\ \text{hPa}

Pilots switch to standard pressure above the transition altitude.

Below transition altitude:

use local QNH

Above transition altitude:

use standard setting / QNE

🟣QFF

QFF = Sea-level pressure corrected for temperature

This is mainly a meteorological value, not normally used by pilots for flying.

It estimates what the pressure would be at sea level using actual atmospheric conditions.

Weather services use it for pressure maps and forecasts.

Difference from QNH

QNH assumes a standard atmosphere

QFF uses actual temperature conditions

So QFF is more useful for meteorologists than pilots.

🟤Quick comparison table

Setting Altimeter shows Typical use

QNH Altitude above sea level Normal flying
QFE Height above airport Circuits/military
QNE Flight level using standard pressure High altitude flying
Standard setting Same as QNE (1013.25 hPa) Above transition altitude
QFF Meteorological sea-level pressure Weather maps

⚫Easy real-world example

Airport elevation: 500 ft

Setting Altimeter on runway

QNH 500 ft
QFE 0 ft
QNE / Standard Depends on weather; usually not 500 ft

A320 flight control computer

A Nigeria-bound Delta Air Lines Airbus A330 was forced to return to Atlanta after spending nearly eight hours in the air over the Atlantic Ocean on May 9.

Flight DL54, operating from Hartsfield-Jackson Atlanta International Airport (ATL) to Lagos Airport (LOS), turned around mid-flight due to what the airline described as “operational issues.”

Your thoughts !

Runway Declared Distances

Fatigue: The Silent Threat in Aircraft Maintenance & Engineering

Aircraft maintenance engineers and mechanics are the unseen guardians of aviation safety. Every inspection, torque value, wiring connection, and maintenance release carries enormous responsibility. But one invisible hazard continues to threaten even the most experienced professionals: Fatigue.

Why Fatigue Matters in Aviation Maintenance

Fatigue is not simply “feeling tired.”
It is a physiological condition that reduces:

* Concentration and situational awareness
* Reaction time and judgment
* Memory and decision-making ability
* Communication and teamwork efficiency

For aircraft engineers and mechanics, a small error caused by fatigue can become a major safety hazard.

A missed cotter pin, incorrect torque application, forgotten panel latch, improper tool accountability, or skipped inspection step may lead to serious incidents or accidents.

Common Causes of Fatigue

Aircraft maintenance operations often involve:

* Long working hours
* Night shifts and rotating schedules
* High workload and operational pressure
* Insufficient sleep and poor circadian rhythm alignment
* Environmental stress (noise, heat, cold, confined spaces)
* Extended troubleshooting tasks
* Time pressure before aircraft release

Human performance naturally decreases during late-night hours, especially between 02:00 and 06:00, when alertness is at its lowest according to circadian rhythm studies.

Effects of Fatigue on Engineers & Mechanics

Fatigue can lead to:

* Reduced attention to detail
* Slower troubleshooting capability
* Increased maintenance errors
* Poor communication during shift handovers
* Forgetfulness and skipped procedures
* Reduced hazard recognition
* Microsleep episodes during critical tasks

In aviation maintenance, fatigue does not only affect the individual — it affects the entire safety chain.

Possible Results

History has shown that maintenance-related errors can contribute to:

* Aircraft system failures
* Flight delays and operational disruptions
* Damage to aircraft structures or components
* Regulatory violations
* Safety incidents and accidents
* Loss of trust and organizational reputation

How We Can Reduce & Prevent Fatigue

Safety begins with recognizing fatigue as a real operational risk.

Best Practices for Fatigue Management:

* Ensure adequate sleep before duty
* Follow approved duty-time limitations
* Take scheduled breaks seriously
* Maintain proper hydration and nutrition
* Use checklists and independent inspections
* Encourage open fatigue reporting culture
* Improve shift planning and manpower allocation
* Avoid unnecessary overtime accumulation
* Conduct effective shift handovers
* Support Fatigue Risk Management Systems (FRMS)

Final Thought

Aircraft do not fail because of a single mistake alone.
Accidents often occur when fatigue, pressure, distraction, and human limitations align at the wrong moment.

Pilot Ranks Explained