B747-400 flight crew reported loss of hydraulic system while taxiing off runway after landing.
Synopsis
B747-400 flight crew reported loss of hydraulic system while taxiing off runway after landing.
Narrative
After landing at ZZZ XXC we were instructed by ATC to turn left at [Taxiway] 1 then right on 2. I started the left turn at about 10 kts.; as I was about to roll out of the turn at 1 and turn right towards 2; it felt like the tiller stuck and I could not rotate the tiller to the right. I added right rudder and it didn't help either. At this time the Captain took over control and found out he couldn't turn on his side.About the time we were on 1 taxiway ATC advised us that there's smoke coming out of our engine; which turn out to be hydraulic fluid leaking near engine 2.By the time Captain found out there is no steering capability and hearing ATC saying smoke; we noticed on EICAS and status pages that HYD SYS 1 is gone with 0 QTY indicated.Before the landing it was pretty uneventful arrival and stabilized approach; slightly under flare resulting on a firmer landing. The lost of steering was a surprise to everyone in the flight deck.Cause: Lost of HYD 1 results in loss of steering on taxiway.One thing both Captain and I had noticed is that on the arrival when we were still between FL200-300; the yoke is having high frequency small movement fwd/aft while we are on right Autopilot; but we couldn't figure out why it was doing it and the aircraft was stable. After losing HYD1 on landing and looking back; maybe it has something to do with losing control effectiveness with slow hydraulic leak in flight?Suggestions: Next time when there's something out of ordinary like the yoke making small but high frequency movements we experienced today; I'll definitely look over all the lower EICAS pages to see if we can find any clues. We didn't open up the status page to check HYD quantity on arrival because there was no EICAS message to drive us to investigate.
Second reporter narrative
Landed XXC ZZZ and exited [Taxiway] 1 left. Tower Control advised there was smoke coming from the number 2 engine but we had no abnormal engine indications. Shortly after; we attempted to turn right on to 2 for parking on the cargo ramp and the aircraft tiller would not move. EICAS message HYD QTY LOW 1 appeared and I stopped the aircraft. Tower called crash fire rescue (CFR) due to the apparent smoke coming from the engine and I advised both CFR and Tower that we had lost hyd pressure and could not steer the aircraft. I communicated with CFR and we shut down the aircraft; They advised us hydraulic fluid was leaking from the left wing. Operations was contacted and a tug was sent to tow us to the cargo ramp. Cause: Loss of hydraulic system 1.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.