ATR systems - Fuel system 

Lol

Thanks for the info!

It's in the making! However, the engine is a large subject. It's more than the oil system. It takes a little more time before the video ready.

Yes, you are right. FCOM states that there's one drain valve in each tank. I missed that and used an inaccurate drawing as reference. Thank you for correcting me.

you're welcome capt

It's in the making!

Gravity. The fuel tanks are above the engines. If you forget to select the electrical pump ON before start, there's already fuel in the line, and the HP pump will very soon assist the gravity by sucking more fuel from the feeder tank. However, the motive flow valve remains closed as long as the fuel pump is selected OFF. Therefore, the feeder tank will not be topped up, and you will sooner or later receive a LO LVL alert. That should wake you up!

Yes, FOB must be entered manually into the FMS. No, we read the fuel quantity indicators. The point is that FOB and the fuel quantity indicators show the same numbers when we start the engines. The refuelling handling staff give us a receipt showing how much fuel they have added to the tanks. For example, if we landed with 800 kg in the tanks and ordered 2,000 kg, we should have received 1,200 kg / 0.785 = about 1,530 litres. If the receipt show something very different, we must find out why. It happened to me once; we received 200 litres more than the receipt showed. The refuelling staff insisted he was right. If he was right, then our indicators were wrong. We used the magnetic indicators to cross-check that the fuel indicators were correct. This is the only time I have used them.

@@FlywithMagnar Very interesting story. Thank you very much for extensive answer

Hi, there might be several reasons for why the feeder tank is not full. Examples: 1) Fuel leak from the feeder tank (as you mentioned). 2) A clogged jet pump preventing the feeder tank to be filled up. 3) A leak in the line from the feeder tank to the LP valve. If the latter is the case, use of crossfeed will result in unnecessary loss of more fuel. Since the pilots cannot determine the cause, the most conservative procedure is applied. Question 2: Unusable fuel is 130 kg only if the feeder jet pump has failed. Since the pilots cannot determine the cause for the fuel low level alert (when the fuel quantity is >160 kg), the most conservative procedure is applied. (FCOM PRO.NNO.ABN.28)

Thank you so much captain, I'm preparing for command interview! Your videos give me the confidence about the aircraft! Your help is greatly appreciated

The fuel temperature is, under normal operations, identical in both tanks.

The temperature in the left fuel tank is more or less the same as the temperature in the right fuel tank. Therefore is only one temperature sensor required.

@@FlywithMagnar thousand tanks for your soon answer captain Magnar

Finding the single engine rate of climb requires some serious calculations. Instead, we calculate maximum weight that enables us to climb at a specific gradient and to clear obstacles after take-off and during go-around. At 22 tons in standard atmospheric conditions, the single engine ceiling is 14,400 ft. The numbers vary considerably with aircraft weight and temperature. You might find it interesting to watch this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-AIfwMy-rhig.html

Currently, I don't have access to the electronic checklist. If there's a discrepancy between the electronic checklist and the QRH, then the QRH has priority. QRH procedure: If leak from engine? No. (Don't shut down the engine.) If leak not located? No. (You can use cross-feed.)

@@FlywithMagnar Thank you for your answer, the ECL is the same as the QRH, I thought you had to choose one of the options, that's why it didn't make any sense for me in case of a leak from the wing tank (leak not located, when indeed it is , and close the xfeed), now it's clear, according to your answer, there is no need to shut the engine down, and you can keep engine running with x-feed open, but you have to be sure 100% that the leak is from the tank, again thank you, really appreciated

The ecotank is empty when the engine is running. Therefore, a leak can only be detected after the engine is shut down and there's fuel in the ecotank. I'm not a mechanic, but troubleshooting should be quite easy, as the ecotank is located below the engine and is relatively easy to access.

In the QRH, there's no checklist for excessive fuel flow. The nearest checklist is FUEL LEAK. Here, it is written: "If excessive fuel flow was identified before engine shutdown: FUEL X FEED VALVE CAN BE OPENED." That means you can use fuel from both tanks to feed the operating engine. The reason is, when you see excessive fuel flow, the leak is after the fuel flow meter for that engine. The fuel tanks are not affected.

@@FlywithMagnar thank you for this quick answer. I probably miss something but what I understand it’s that if you open the cross feed valve you will continue to feed the leaking engine and so the failure will remain ?

@@Xavieralberici, no, the engine is shut down as prescribed by the checklist. The failure is in the engine, not the fuel tank. Watch from 20:22 in the video.

@@FlywithMagnar that was the element missing : the leaking engine off. Thank you 🛫🛫

Hello Boy. Anti-skid only works with normal brakes. The emergency brake does not have anti-skid.

@@FlywithMagnar Thank you for that very quick reply! I now see that I posted my question in the wrong video but the answer is very much appreciated even if not linked to fuel system at all :-))

There are two fuel quantity indicator systems, one for each tank. The fuel quantity in each tank is shown in the cockpit and the refueling panel. One of those tweo fuel indication systems may be inoperative for dispatch, provided you comply with the conditions in MEL, including checking the fuel quantity in the affected tank by using manual (magnetic) indicators after each refueling.

@@FlywithMagnar appreciated capt safe skies 🙂

Yes, the fuel temperature in each wing tank is more or less the same. Therefore, it is not necessary to install temperature sensors in both tanks.

The fuel delivery pressure is less than 4 PSI. Probable causes: 1. The assosicted fuel pump is selected OFF. This closes the motive flow valve. Therefore, the first line in the FUEL FEED LO PR checklist is to verify that the fuel pump is ON. 2. Jet pump failure + electrical fuel pump failure. 3. The motive flow valve is jammed shut + electrical fuel pump failure. 4. Something is partially blocking the fuel from flowing from the tank to the engine. 5. Fuel leak between the fuel tank and the pressure sensor. This might result in a significant loss of fuel from the associated tank. In that case, the procedure is to shut down the engine (and hope that there will be no fire).

@@FlywithMagnar Thank you Captain

Yes, the electrical fuel pump is only needed to start the engine. The engine drives a HP fuel pump, which has a much better capacity.

I mean with Push Button off with low pressure alarm

The engine will run fine with the fuel pump selected off. The low pressure light should not be illuminated, because the engine driven fuel pump will suck fuel from the tank.

Thanks a lot Captain

Actually that's the way to cross fuel when engine still running, thanks for videos

Around 7 hours. Total capacity is 5,000 kg. For quick planning, we calculate 800 kg for the first hour and 700 kg for the next hours.

@@FlywithMagnar where i can get refensi for this capt, cause this my home work, thank a lot before

The fuel consumption depends heavily on the cruise level. The reference is found in FCOM PER (Performance).

Thank sir

Hallo sir, can you give me, fcom spesifik about this fuel consumtion if full tank

If the valve does not open, there will not be any blue light on the refueling panel. If manual control does not help, the option will be fueling by gravity.