Narrative:

About 20 KTS before V1/vr we felt a bad shaking. Felt like we blew a tire. Got airborne and decided to not raise gear. So reported that we lost 'C' hydraulic system which meant we could not raise the gear and had lost nosewheel steering plus parts of other system. Climb to 5000 ft MSL and dumped 30000 pounds of fuel to put us below maximum landing weight. Takeoff weight was 379500 pounds. We were not sure if a main tire(south) had blown. We had a right 'truck' light which made me suspect a blown right main -- the reason for dumping and preparing the passenger for an emergency landing and possible evacuate/evacuation. We declared an emergency with approach and requested the longest runway and equipment. Uneventful landing until nosewheel was lowered. Then got the shaking. We then knew it was a nosewheel tire(south). Was able to clear runway with differential braking and power. A recapped nose gear tire had come apart and took out hydraulic lines for the nosewheel steering and caused the total loss of 'C' system. WX was 700 ft overcast good visibility. Suggestion: ATC should inform pilot of minimum dump altitude. In atl 5000 ft was a bit too low, a fact I found in our general operations manual, but not in our aircraft operations manual which had our emergency procedures.

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Original NASA ASRS Text

Title: L1011 ACFT ON TKOF ROLL, FLC FELT BAD SHAKING AND CONTINUED. AFTER TKOF 'C' HYD SYS WAS LOST DISABLING RAISING THE GEAR AND NOSEWHEEL STEERING. FLC LEVELED AT 5000 FT, DUMPED 30000 LBS OF FUEL, DECLARED AN EMER AND RETURNED FOR AN UNEVENTFUL LNDG. NOSEWHEEL TIRE HAD BLOWN TAKING OUT THE HYD LINES FOR 'C' SYS.

Narrative: ABOUT 20 KTS BEFORE V1/VR WE FELT A BAD SHAKING. FELT LIKE WE BLEW A TIRE. GOT AIRBORNE AND DECIDED TO NOT RAISE GEAR. SO RPTED THAT WE LOST 'C' HYD SYS WHICH MEANT WE COULD NOT RAISE THE GEAR AND HAD LOST NOSEWHEEL STEERING PLUS PARTS OF OTHER SYS. CLB TO 5000 FT MSL AND DUMPED 30000 LBS OF FUEL TO PUT US BELOW MAX LNDG WT. TKOF WT WAS 379500 LBS. WE WERE NOT SURE IF A MAIN TIRE(S) HAD BLOWN. WE HAD A R 'TRUCK' LIGHT WHICH MADE ME SUSPECT A BLOWN R MAIN -- THE REASON FOR DUMPING AND PREPARING THE PAX FOR AN EMER LNDG AND POSSIBLE EVAC. WE DECLARED AN EMER WITH APCH AND REQUESTED THE LONGEST RWY AND EQUIP. UNEVENTFUL LNDG UNTIL NOSEWHEEL WAS LOWERED. THEN GOT THE SHAKING. WE THEN KNEW IT WAS A NOSEWHEEL TIRE(S). WAS ABLE TO CLR RWY WITH DIFFERENTIAL BRAKING AND PWR. A RECAPPED NOSE GEAR TIRE HAD COME APART AND TOOK OUT HYD LINES FOR THE NOSEWHEEL STEERING AND CAUSED THE TOTAL LOSS OF 'C' SYS. WX WAS 700 FT OVCST GOOD VISIBILITY. SUGGESTION: ATC SHOULD INFORM PLT OF MINIMUM DUMP ALT. IN ATL 5000 FT WAS A BIT TOO LOW, A FACT I FOUND IN OUR GENERAL OPS MANUAL, BUT NOT IN OUR ACFT OPS MANUAL WHICH HAD OUR EMER PROCS.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.