sandro.oberoi

NATOPS1... I thought you did not understand my question perviously.. but actually it was me not getting your answer.. I apologize your point number 1 and 2 are right. i agree with your point 3 and some of my colleagues don't. for the point 4 we do have unbalance limits as any 130 utilizer but it's not an issue in this case 5. normal landings are to be done in tank to engine configuration, touch and goes are exeptions and can be done in xfeed from AUX/EXT or fuselage tank (KC version). your point about abort in the GO part is right.. but i think it includes some risks that's why the pilot is requested not to plan full stops in that configuration. Your point on landing in cross feed from boost pump of TK1 is a very good point that i did not think about, and I thank you for your advice. The problem is that the manual does not include any procedure of crossfeeding from other boost pumps (except for the LOW FUEL STATE OPS) and legally i cannot deviate from the manual procedures. So the 2 options I have are still: 1. Landing in cross feed from TK2 transfer pump (which i don't like because i'm afraid of possible AIR BUBBLE being pushed into the engine due to sloshing 2.Landing in tank to engine configuration (with eng 2 gravity feeded) which i prefer because manual does not give any caution about this. But still the manual gives wide spaces to own interpretation whether to land in config 1 or 2 and i would like to know how probable it is to experience a flame out by landing with engine crossfeeded with a main tank transfer pump (which does not suck fuel in level flight below 1520 lbs in that tank) Thank u NATOPS :)

that's a good point.. u would land using the tank 2 transfer pump because u want fuel to feed the engine on pressure in case of go around etc... good point... but let me go further with what the manual says: -"FEEDING ENGINE WITH MAIN TANK TRANSFER PUMP" - ....omissis...."perform the following whenever gravity feed is non practical or desided" -FUEL GRAVITY FEED FOR INFLIGHT OPERATIONS - The ENG 1 (2,3, or 4) FUEL PRESS LO © message can be expected during gravity feed operations. engine operation is normal" -"cross feed operation for approach and a series of touch and go landings is permitted using fuel from AUX, EXT or fuselage tank..." guess what.. these tanks have transfer pumps placed on the bottom (no big sloshing problems except in case of full stop landing when fuel moves forward and stays there until braking action and reverse are completed) -"MAIN FUEL TANKS"... omissis... "the transfer pump location ensures a protected amount of fuel that cannot be transfered or dumped " (1520 lbs in level flight) So, considering in normal ops we can do touch and goes crossfeeding only from AUX and EXT, but we cannot perform full stop landings... what about performing full stop landing crossfeeding from a main tank which transfer pump is placed in order to leave 1520 lbs of fuel not dumpable/transdered in flight... do we know till what amount of fuel, transfer is granted in a brake + reverse sloshing condition? (1520 is not considering landing sloshing). Thank you for your patience

NATOPS1 i think you did not get my question. You gave a beautiful explanation about the Main tanks Boost Pumps... which of course have a suge box, have a water removal system and prevents flame out etc... and when it works we are in normal operation (not cross feed) ... but before answering to a thread i suggest to read the question... THE BOOST PUMP HAS FAILED.... we are now force to decide to go for cross feed or gravity.... crossfeeding from its own tank can be done only from its transfer pump.. which is OUT OF THE SURGE BOX... and placed aloft from the bottom of the tank in order to leave a certain amount of fuel in case of dumping... and all is fine as long as we have more than about 1600 pounds of fuel and we do not have to land... when we have to land... we have fuel slosh, that's why the manual says that we can perform touch and goes in cross feed using AUX and EXT tanks (since their transfer pumps are placed on the tank floor... as the main tanks boost pumps are...). Anyhow...I'm looking for an answer.. not to give one... Thanks anyway for at least trying...

Good morning everyone, When a main tank boost (for example n°2) pump stops working (no leak and pressure switch tells the truth), the EMG CHKLIST tells us to "use alternate fuel management for cross feed". Right... so far so good... we prime the manifold and start crossfeeding the engine with the TK2 transfer pump. But what to do before landing? the manual in section 2D tells us to go tank to engine during landings (except for touch and goes that can be done in crossfeed from aux and ext tanks). Some pilots in my Airbase says that since we are not in a standard situation, we have to disregard section 2 and instead we HAVE TO land with engine 2 still cross feeded by TK2 transfer pump. In my opinion, it is instead better to land in tank to engine (eng2 feeded by gravity) rather than in Crossfeed from tank 2 since the transfer pump does not suck fuel from the bottom of the tank and during ground roll in reverse i believe it is possible to experience a flame out due to fuel sloshing! The manual is not clear enough to remove this doubt and I would like to get an aswer from some maitenance expert or test pilot to understand what is better to do during landing... CROSSFEED FROM MAIN TANK or GRAVITY? Thank you for your attention Sandro