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Showing results for tags 'jettison'.
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Hello, First of all, yes, I used the search function on this forum, and yes, I searched through both FCOM's, the FCTM and the QRH. That said, I still don't have an answer for the following situation: Tonight, I was testing the 777 (using the freighter version). I was all set up for a long flight at high load, but ran into a (programmed...) severe engine failure shortly after liftoff. My first priority was to keep flying the aircraft. No particular problem, despite the alarms and sudden loss of thrust on the left side. Once I got everything under control, I went through the appropriate checklist on the ECL. So far, so good. Now, my plan was to land back at my departure airport, but to do so, I had to jettison about 80000kgs of fuel. I entered a hold over the sea to do just that. The problem I ran into here, is that with only one engine operating, dumping fuel caused a quickly escalating fuel imbalance, and no matter what I tried, I couldn't get it to stabilize. By the time the center tank was empty, the imbalance had reached about 3500kg. Roughly what could be expected without cross feeding. I kept the fuel jettison going for a while to see whether the auto jettison function would turn off the right jettison pump when the right main tank (the less full one) reached jettison goal/2 (which it didn't). No idea whether it should stop here though, it was just an idea I had while flying so I tested it. a couple of notes: 1) fuel jettison with 2 engines running seemed to be working perfectly fine in a previous test flight. 2) cross feed also worked perfectly when fuel wasn't being jettisoned. As it was, I manually stopped the fuel jettison a bit early, and then kept flying in the hold while cross feeding to reduce the imbalance a bit, before landing. Anyway, what I'm looking for: What would be the correct procedure in this case? What went/did I do wrong? Feel free to reply with references to the correct sections in the manuals... I didn't find what I was looking for so far... Thanks in advance...
