Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 90; Flight Crew Total 14000; Flight Crew Type 3000
Situational Awareness
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Inflight Event / Encounter Fuel Issue
Flight Crew Landed As Precaution; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
After rotation with the positive rate gear up call the gear handle was raised and we received the ECIAS message Gear Disagree. We continued with the departure and I advised the IRO (International Relief Officer) to read the QRH procedure. We advised ATC we had a Gear problem and advised them of our situation. I contacted Flight Control and with Maintenance; Dispatch; and a SME (Subject Matter Expert) we discussed the problem and determined that the best course of action was return to [the airport]. Dispatch sent an amended release and we dumped fuel for the return. On the STAR we received an EICAS Fuel Imbalance 1 and 4 followed by EICAS Fuel Imbalance 2 and 3. All attempts using the QRH Procedures proved unsuccessful. Fuel imbalance continued to deteriorate. Fuel was draining out of Tank 1 rapidly. We then ran the fuel leak checklist. We determined that the fuel was not leaking externally but going into tank Number 2. The fuel would not stop draining from tank Number 1 into tank Number 2. We looked for further guidance in the QRH but could not find any. Using system knowledge we chose to open the cross feed and feed engine Number 1 from tank 2 and turn off the pumps on engine Number 1. The fuel continued to leave tank 1 and go into tank 2. Upon landing the difference between tank 1 and 4 was 10;000 pounds. The fuel imbalance 2-3 was brought back into tolerance by using tank 2 to feed 1;2; and 3 engines. When tank 1 continued to drain uncommanded we declared PAN PAN PAN at which time ATC gave us expedited handling. Landing was uneventful.
[Report narrative contained no additional information.]
The flight crew of a B747 reported they received an EICAS message 'Gear Disagree' and also had an un-commanded fuel transfer.