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Free2Fly320  🛫Airbus A320 📚Educational posts 🐤@free2fly320 ♻️Want to repost or use? Please ask 🎞 Approaching Palma PFD/ND:

Educational post‼️
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We are watching you...
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9/11 attacks set a revolution around aviation security. Airports, personnel and airplanes suffered a deep evolution into what we all know nowadays. A certain number of security steps are required to access a flight deck, and security devices have been installed all around.
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Modern airliners are fitted with several surveillance cameras for flight deck access control. They are monitored from the flight deck itself, and a few steps are required to be completed before a crew member access can be granted. There’s no chance for a person to access the flight deck without pilots knowledge and permission.
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In some cases, the flight deck is only allowed to be visited (based on captains authorisation) by passengers on the ground with the airplane doors opened. Once the airplane doors are closed, the flight deck becomes secure, and it will continue to, until the doors are opened on destination.
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Educational post‼️
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Of course you know that life vests are available to all passengers onboard commercial airplanes nowadays, but... what about the pilots? Do we have life vests as well? Maybe we are we treated as “self-floating devices”?
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Yes, we do have life vests available to us as well, and they’re wisely located in the back of our seats. They’re exactly the same as any other passenger device, but some airlines actually tint them red as opposed to yellow, for easier crew identification. They’re made of urethane coated nylon and are flame retardant.
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To inflate them, a 33 gram CO2 cartridge is used, and they can also be inflated or topped up by blowing into a plastic tube. A light attached to it actually illuminates if they get submerged.
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Their service life can be indefinite, providing the unit continues to pass periodic maintenance inspections (usually every 60 months). Stretched inspection periods of up to 10 years are available to special models if they are packed in a Extended Shelf Life packaging.
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⚠️ Bonus! Life vest pricing is in the range of 50 to 250 € a piece. Please, don’t remove them from the airplane as they entail a massive cost to the airlines, and you would probably look like a nerd if you were to use it in public. 🤓
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Educational post‼️
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Today we’re talking about the ISIS. Well, not “that” ISIS, but the one we’ve got onboard.
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The ISIS (Integrated Stand-by Instrument Systems) allows us to have an independent navigation source if our main Primary Flight Displays air data sources fail. It is located closer to the captain and it displays: attitude, altitude, airspeed and Mach, barometric pressure, Landing System information and bugs (for altitude and speed reference). It is fed by independent standby dynamic and static pressure sources and it’s electrically fed by the Essential Bus, so its always powered in case of total electrical failure.
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In normal operations, it is usually used as a cross check reference.
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Instrument view today‼️
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Full ILS approach to Palma.
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⚠️Due to IG 1-minute-long videos policy, I had to speed it up a bit 💨
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Bigger screen? Link in bio 😉
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Educational post‼️
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🔵APU.
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🔴“Sorry, what?”
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🔵APU!
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🔴“What’s that?”
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➡️The APU is the Auxiliary Power Unit, and it’s a self-contained unit located at the tail of the aircraft that supplies the aircraft with pneumatic and electrical power when the engines are not running, or when the engines are running in some particular cases. It is basically a scaled single-shaft turbine that delivers mechanical shaft power for driving the accessory gearbox (electrical generator, starter, etc.) and produces bleed air for engine starting and pneumatic supply.
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On the ground with engines OFF the aircraft is usually plugged to a ground electrical supply. Just before closing doors, we start the APU to have a source of electrical (and pneumatic, for air conditioning) source so we can remove the ground plug. Then, we close the doors and start the engines using bleed air supplied by the APU. At this stage, you will notice one thing: when the engines are about to start, the air conditioning stops. Why is that? Because the APU bleed air is being diverted to the engines so they can start turning and, adding fuel and a spark, they turn on.
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The APU, as any other fuel+spark device in the airplane, is equipped with a fire extinguisher bottle. It can be discharged by the flight crew in the air, and in case of a fire on the ground, the APU will automatically shut down and discharge the fire extinguisher.
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As you may have imagined, the APU being a jet engine means that it is LOUD, therefore, noise-sensitive airport authorities require the APU to be shut down most of the time. As an example, Palma de Mallorca airport requires the APU to be shut down 2 minutes after arriving to the stand, and to be started just 5 minutes before departure.
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⚠️BONUS: On the ground, the APU fuel consumption is about 130 Kg/h (155 liters/h), which equals a car full tank every 15 minutes.
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Educational post‼️
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Have you ever wondered what would happen if you were to stand right behind a jet engine, just like in the cinemagraph shown above?
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Well, wonder no more! I’ll do the calculations for you. Let’s assume you’re not standing right behind the engine (who would be wacky enough to do that, right?). Let’s place you next to the rear door, about 20 meter away from the exhaust.
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☝🏼Ready?
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⚠️“Ok, starting engine 1”. At this time, you would start feeling a light warm 20ºC breeze blowing your face, and probably in about 30 seconds time, that breeze would turn into a 52ºC, 54 km/h tropical-depression-force wind. Not too comfy, really.
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⚠️“Cleared for takeoff, takeoff thrust set!”. Things would start to feel REALLY uncomfortable at this time. Our tropical depression rapidly transforms into a roasting 150ºC, 145 km/h CAT I Saffir-Simpson grade hurricane. For sure, you wouldn’t have to worry about your hair style anymore and you wouldn’t definitely try not-so-smart stuff like this anymore.
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🧐Being a bit more serious: graphics provided by engine manufacturers show the influence areas of this jet blast, and it’s something very important for us to know abut, as it can affect our daily operation.
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📕A couple of examples: when taxing out from a remote parking position, it is very important for us to maintain idle thrust, as increasing it too much could result in damage to the property, or personnel.
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📗Another example: in winter operations, airplanes become de-iced and anti-iced with fluids spread over the airplane’s surfaces. This fluids delay the formation of ice. Then, we taxi to the runway and perform the take off. Being too close to the preceding aircraft during taxi can result in our anti-icing liquid being blown away by its engines exhaust, thus, reducing the anti-ice treatment effectiveness.
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