B747 Flight Crew reported two main tires failed on takeoff along with hydraulic system pressure and quantity alerts enroute; resulted in return to departure airport.
Synopsis
B747 Flight Crew reported two main tires failed on takeoff along with hydraulic system pressure and quantity alerts enroute; resulted in return to departure airport.
Narrative
During take off suspected tire failure. Subsequent loss of system 1 hydraulic failure with company request to return to ZZZZ.Cause: During take off suspected tire failure. After take off ATC advised FOD was on runway to Airline X landing aircraft which landed safely. Subsequent aircraft were advised to go around. ATC Queried our aircraft as to whether operations was normal. Captain advised ATC that we suspected tire failure during take off roll do to slight yaw during the take maneuver but that operations were normal. Communicated with company during climb out via ACARS of suspected tire failure. Approaching initial cruise level off FL290 had EICAS advisory message HYD QTY LOW 1 EICAS advisory message shortly followed by HYD PRESS SYS 1. Checklist were completed per QRH and comm established with company via SATCOM and the decision was made by the company to return to ZZZZ. Advised ZZZZ ATC the need to jettison fuel for approach 45 minutes prior to commencing approach to reduce to max landing weight. Crew advised ATC that the aircraft would stop on the runway due hydraulic failure and tire failure and that TUG would be required. When fuel jettison was complete [requested priority handling] and required approach clearance and emergency vehicles to be standing by. Commenced approach per QRH loss of hyd system 1 utilizing alternate gear extension. FLAP 30 landing weight 290;000 KG auto brakes off per the flight manual recommendation. During last part of landing roll EICAS ADVISORY message HYD QTY LOW 2 and HYD QTY 4 message. Aircraft safely stopped on the runway. ZZZZ emergency equipment advised to shut down engines and that smoke was observed from the wheel well but no fire. No requirement to evacuate the aircraft.
Second reporter narrative
Upon arrival to the aircraft; everything seemed normal as we completed preflight duties. We had 5 MEL's however it did not seem to have had an effect on the tire failure later on. We taxied out like normal and entered XXL for takeoff; at some point after the '80 kts.' call we experienced a sudden vibration and and the aircraft pulled to the left. Engine operation appeared normal as well as no EICAS messages so we continued the takeoff. The gear retracted normally and there was no indications of an urgent problem. After making contact with Departure Control we were asked if we were 'Operations Normal;' to which we replied that we had no further indications of any abnormality. We began hearing chatter of debris found on the runway after our takeoff and confirmed with ATC that tire debris were indeed found on XXL. We decided that a tire failure was reasonable to continue to ZZZ and have it addressed there. Nearing our cruise altitude of FL290 we received HYD QTY LOW 1 EICAS and subsequent the HYD PRESS SYS 1 EICAS. We ran the checklist and no further action was necessary at the moment. We contacted the company by SATCOM to keep them informed. By company request we coordinated a returned to ZZZZ with ATC. We then coordinated the fuel jettison which took around 45 minutes as well as informing ATC to expect the aircraft to be disabled on the runway after landing. Shortly after fuel dump was complete we commenced the approach to XXR via the RNAV transition. We anticipated the inboard trailing edge moving in secondary; as well as the Alternate Gear Extension. We [requested priority handling] just prior to commencing the approach and requested emergency services be available as we will not be able to move after we land. The approach was fairly routine except the QRH deffered items. We used Flaps 30; autobrakes off and idle thrust reverse for the roll out as Engine 4 reverser was MEL'd. The touchdown was smooth; however the aircraft pulled to the left once again but was steered back to centerline. We received HYD QTY LOW 2 and 4 later on in the rollout. Once we came to a stop; fire services positioned and informed that two tires on the right body gear had failed and that a bit of smoke was observed. We monitored gear temperatures and didn't notice numbers beyond 2's and 3's on the right side. We did not identify the need to evacuate at that moment and waited for airstairs to be brought to the plane for a normal deplaning.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.