Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Fuel Issue
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
After takeoff autopilot connected at 1;000 AGL. Flaps retracted on schedule in a 180 degree turn off [Runway] XXR. Noticed that the attitude pitch did not match the flight director command followed by a Level Two 'STAB out of trim' alert.  We then made the decision for an air turn back; notified ATC; transferred control of the jet to the me (Pilot Monitoring) and advised ATC of the need to dump fuel (gross weight-600K LBS.) with a request for a holding pattern at a block altitude of 6;000-7;000 feet. ATC denied the hold and elected to vector us over the water in their radar holding pattern. The QRH was consulted for stabilizer out of trim which led us to a non abnormal alert 'Stabilizer Inop. We then noticed that the stabilizer trim had not moved from the takeoff setting of 8.0 degrees. Fuel dump continued in the radar hold until 522K gross weight; then the cross feed relays failed and forced the dump command to stop. We flew in the radar pattern for about another 50 minutes within about 35nm from ZZZZ until our bingo fuel of 32K; with now a runway change to XXL. ATC was advised of the need for a 20nm final approach and a request of no traffic in front of us. We discussed the go around possibilities; configured on schedule early of the slats/flaps and gear. Aircraft control was then transferred to the Captain and the autopilot disconnected with noticeable pitch down; landed uneventfully. Failure of trim gear fuse pin."
After takeoff autopilot connected at 1;000 [feet] AGL.  Flaps retracted on schedule in a 180 degree turn off XXR.  I immediately noticed that the attitude pitch did not match the flight director command followed by a Level Two 'STAB out of trim' alert.  Elected to keep the autopilot connected thru the turn.  After the flaps and slats were retracted; I disconnected the autopilot and had to use a tremendous amount of strength to overcome the aircraft's desire to pitch up.  I extended the slats with a speed edit of 210 KTS and that relieved some of the nose up tendency and reconnected the autopilot. I then made the decision for an air turn back; notified ATC; transferred control of the jet to the First Officer and advised ATC of the need to dump fuel (gross weight-600K LBS.) with a request for a holding pattern at a block altitude of 6;000-7;000 feet.  ATC denied the hold and elected to vector us over the water in their radar holding pattern. The QRH was consulted for stabilizer out of trim which led us to a non abnormal alert 'Stabilizer Inop.  We then noticed that the stabilizer trim had not moved from the takeoff setting of 8.0 degrees. Fuel Dump continued in the radar hold until 522K gross weight; then the crossfeed relays failed and forced the dump command to stop. We flew in the radar pattern for about another 50 minutes within about 35nm from ZZZ until our bingo fuel of 32K; with now a runway change to XXL. With the First Officer still flying (autopilot on) ATC was advised of the need for a 20 nm final approach and a request of no traffic in front of us.  We discussed the go around possibilities; configured on schedule early of the slats/flaps and gear. Aircraft control was then transferred to the Captain and the autopilot disconnected with noticeable pitch down; but controllable. Landing; uneventful. Inspect Trim drives on a C check if not already done."
Flight Crew reported stabilizer trim failure at takeoff resulted in fuel jettison with failure of the jettison system that led to holding for fuel burn to below max landing weight and a return to the departure airport.