JOHA Aviation

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JOHA Aviation

JOHA verbindt passie voor luchtvaart met sterk leiderschap en ondernemerschap. Voor een toekomst die blijft vliegen.

Wij bieden commerciële pilootdiensten voor AOC’s, strategisch luchtvaartadvies en ondersteuning bij duurzame innovatie.

01/09/2026

The bars show up on the primary flight display. Center them, and the aircraft follows the commanded flight path. 🎯

On an ILS approach, it uses localizer and glideslope deviation to work out the corrections needed to stay aligned with the runway and descend on path.

Here’s the surprising part: the flight director can stay active with the autopilot off. The pilot’s hand-flying the aircraft, just following the cues.

Passengers won’t notice a thing. A smooth turn or descent through cloud can be flown by hand with the same precision. 👨‍✈️

The bars guide. The pilot flies.

31/08/2026

If the instability spreads through the compressor, pressure can collapse and airflow may briefly reverse. That system-wide oscillation is called a surge. ⚡

It can look dramatic: a bang, vibration, rising exhaust-gas temperature, fluctuating RPM, reduced thrust, and sometimes a brief flame at the exhaust.

Here’s the surprising part: a short stall can clear itself, and the engine keeps running normally. Only repeated or non-recoverable events risk flameout or damage.

Modern engines guard their stall margin with variable stator vanes, bleed valves, and carefully scheduled fuel flow. 🛠️

The crew follows the aircraft-specific checklist, watches the engine indications, and reduces or shuts down the engine if needed.

The noise may be dramatic. ✈️
The response stays procedural.

30/08/2026

⏳ 18 months. 13 exams. No second chance on the clock.

Did you know an ATPL candidate has just 18 months and 4 sittings from their first theory exam to pass all subjects? ⚠️ Miss that window, and the entire theoretical course has to start over.

And there's more this year: EASA is rolling out the ECQB 2026 📚. It's the updated question bank for ATPL/CPL/IR exams, including new learning objectives on fuel and energy management ⛽.

Students already testing under ECQB 2024 simply continue as normal ✅. New candidates start on the updated version.

👨‍✈️ For candidates: plan your sittings tightly. That clock doesn't pause.
🧑‍💼 For flight schools: every syllabus update is a moment to check your training material, scheduling, and student support. Do it before a gap becomes a missed deadline.

Exactly where Joha comes in 🤝: processes that keep pace, so no one gets grounded on the way to the cockpit.

Blijf vliegen. ✈️

29/08/2026

The panels that rise after touchdown are not primarily there to slow the aircraft through drag. ✈️

They are ground spoilers and their critical job is to destroy lift.

Lift follows:

L = ½ ρ V² S CL

Immediately after touchdown, speed V remains high, so the wings can still support part of the aircraft’s weight. Raising the spoilers disrupts airflow and sharply reduces CL, the wing’s lift coefficient.

Less lift means more load on the main wheels.

More wheel load gives the tyres greater grip, allowing the anti-skid system and wheel brakes to generate effective braking force. The spoilers also add aerodynamic drag, but that is only part of their contribution.

The timing matters. FAA guidance notes that at approximately 118 knots, a two-second delay can consume almost 400 feet of runway.

Passengers see the panels rise as reverse thrust becomes audible. Automatic deployment logic varies by aircraft and may use ground-sensing, wheel-speed and thrust-lever conditions.

Spoilers do not merely help slow the aircraft.

They make the planned stopping performance available. 🛬

28/08/2026

A cockpit warning can temporarily outrank air traffic control. ⚠️

TCAS II is an airborne collision-avoidance system that operates independently of ATC.

It interrogates Mode S transponders and tracks nearby aircraft using range, relative altitude and closure rate.

A Traffic Advisory (TA) means: identify the threat. Pilots do not manoeuvre using TA information alone.

If the risk increases, a Resolution Advisory (RA) commands a vertical response: climb, descend, level off—or restrict vertical speed.

The surprising part is the coordination.

When both aircraft have TCAS II, their systems exchange intentions once per second over the 1030/1090 MHz Mode S link. One can receive “CLIMB” while the other receives “DESCEND.”

Pilots follow the RA immediately, even when it conflicts with an ATC altitude instruction and advise the controller as soon as workload permits.

Passengers may feel an unexpected level-off or climb. That is not improvisation.

ATC provides separation.

TCAS protects the final airborne safety layer. 🛡️

25/08/2026

At cruise altitude, one aircraft can show 280 knots IAS, 470 knots TAS and Mach 0.78, all at once. ✈️

Those numbers answer different questions.

📊 Indicated airspeed (IAS) comes from pitot-static pressure. It reflects aerodynamic loading, making it central to lift, stall margins and structural limits.

🌬️ True airspeed (TAS) is the aircraft’s actual speed through the air. As density decreases with altitude, the same IAS corresponds to a higher TAS.

🔊 Mach number is TAS divided by the local speed of sound. Because that speed changes mainly with temperature, Mach becomes increasingly important high up.

This creates a crossover altitude. Below it,

VMO: maximum operating indicated speed is the relevant high speed limit. Above it,
MMO: maximum operating Mach takes over. Exact values are aircraft-specific.

Your passenger screen may show a fourth number: groundspeed. Wind makes that faster or slower than TAS.

During descent, at constant Mach, IAS normally increases. Crews therefore transition from Mach control to IAS before approaching VMO.

Pilots do not fly one speed.

They fly the speed that protects the limit that matters.

24/08/2026

Carrying more fuel can make an aircraft burn more fuel. ⛽

Before departure, crews do not simply fill the tanks. They calculate block fuel: the usable fuel expected on board before taxi.

That plan may include:
🚕 Taxi fuel.
✈️ Trip fuel to the destination.
🌦️ Contingency fuel for planning uncertainty.
🧭 Alternate fuel, when required.
🛡️ Final reserve fuel.

Under EASA’s basic fuel scheme, contingency normally starts at no less than 5% of planned trip fuel. Approved data-driven schemes may use different values. For turbine aeroplanes, final reserve generally represents 30 minutes at holding speed at 1,500 feet above the applicable aerodrome in standard conditions.

That reserve is protected, not routine delay fuel.

The surprising part: extra fuel adds mass. More mass requires more lift and increases drag, so some additional fuel is burned simply carrying itself.

Passengers may see refuelling stop before the tanks are full. That is not corner-cutting. The correct load balances weather, delays, alternates, performance and landing-mass limits.

Good fuel planning is not maximum fuel.

It is sufficient fuel, with every kilogram justified.

23/08/2026

An aircraft’s “black boxes” are neither black nor simple boxes. 🟧

Most transport aircraft carry two recorder functions:

🎙️ The CVR captures cockpit audio, radio transmissions, intercom and ambient sounds.

📊 The FDR records aircraft behaviour: speed, altitude, attitude, control inputs, engine data and system states.

The surprising part is the protection.

Crash-survivable memory is designed to withstand extreme impact forces, intense fire and deep-water pressure. The recorder itself is painted high-visibility orange, while an underwater locator beacon helps investigators find it after an accident.

Passengers call them black boxes.

Investigators treat the CVR and FDR as two independent witnesses, one recording what was heard, the other recording what the aircraft was doing.

They cannot prevent an accident.

But they help aviation understand what happened, improve procedures and prevent the next one.

Because every flight recorder is more than a record of the past.

It is part of aviation’s safety system for the future.

22/08/2026

Contrails do not reveal what the aircraft is doing. They reveal the air it is flying through. Two aircraft can cross the same sky and only one may leave a white trail. ✈️

A contrail is a human-made cirrus cloud, not smoke. Jet-fuel combustion produces water vapour. At cruise altitude, hot exhaust mixes with very cold air; if that mixture reaches saturation, droplets form and freeze around tiny particles into ice crystals.

Formation is described by the Schmidt, Appleman criterion: a temperature-and-humidity threshold not a switch controlled by the crew.

What happens next depends on relative humidity over ice:
💨 Below 100%, crystals sublimate—change directly from ice to vapour—and the trail disappears.
☁️ Above 100%, the air is ice-supersaturated. Crystals can grow, spread and persist as contrail cirrus.
That explains the passenger surprise: a trail can start or stop sharply when an aircraft enters a different humidity layer, while engine thrust remains unchanged.

Pilots use weather data, not contrail appearance, to assess atmospheric conditions.

Adres

Pastoor De Leijerstraat
Rosmalen
5246JD

Website

http://www.joha.nl/

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