Loss of hydraulics after takeoff. Return land.

Attributes
ACN	267607
Time
Date	199404
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 0 agl bound upper : 50
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial climbout : takeoff ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 2000
ASRS Report	267607
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 2000
ASRS Report	267605
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency other
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

Improved flaps 1 takeoff from den airport runway 35R. 62 degrees F calm winds. At rotation, left main inboard tire tread separated and broke on 'a' hydraulic line causing the loss of 'a' system. Elected to hold and burn fuel to get landing weight down. Held approximately 45 mins when 'B' system started to drop. Returned to den runway 35R and landed. Uneventful landing/rollout. Fire trucks were in position on taxiway. Taxied aircraft off runway on Z10 and removed passenger by portable stairs to bus them back to terminal. Did not want to take a chance taxiing with airplane condition. One thing that might help to prevent this would be if we had the high thrust engines on all our fleet. We would not have to do as many improved flaps 1 takeoffs. This maneuver requires us to add quite a bit of extra speed to our takeoff numbers. The ATC system worked very well. We received all the assistance we requested very promptly and courteously. Supplemental information from acn 267605: ATC informed us of tire tread on runway. Our maintenance determined it was from our main landing gear. Elected to prepare cabin for possible evacuate/evacuation. Returned to den 3000 pounds over maximum landing weight. Had emergency equipment personnel look for fire, none reported. We had to do improved flap takeoff at 62 degrees F because of d-rated engines. This requires a much higher rotation speed than normal. This higher speed rotation may have caused the tire tread to shred. The tire punctured 1 'a' hydraulic line and caused other damage. Additionally, prior to takeoff, we had taxied from ramp area to runway 35R. This long taxi may have heated brakes or tire, which may have aggravated the above problem.

Original NASA ASRS Text

Title: LOSS OF HYDS AFTER TKOF. RETURN LAND.

Narrative: IMPROVED FLAPS 1 TKOF FROM DEN ARPT RWY 35R. 62 DEGS F CALM WINDS. AT ROTATION, L MAIN INBOARD TIRE TREAD SEPARATED AND BROKE ON 'A' HYD LINE CAUSING THE LOSS OF 'A' SYS. ELECTED TO HOLD AND BURN FUEL TO GET LNDG WT DOWN. HELD APPROX 45 MINS WHEN 'B' SYS STARTED TO DROP. RETURNED TO DEN RWY 35R AND LANDED. UNEVENTFUL LNDG/ROLLOUT. FIRE TRUCKS WERE IN POS ON TXWY. TAXIED ACFT OFF RWY ON Z10 AND REMOVED PAX BY PORTABLE STAIRS TO BUS THEM BACK TO TERMINAL. DID NOT WANT TO TAKE A CHANCE TAXIING WITH AIRPLANE CONDITION. ONE THING THAT MIGHT HELP TO PREVENT THIS WOULD BE IF WE HAD THE HIGH THRUST ENGS ON ALL OUR FLEET. WE WOULD NOT HAVE TO DO AS MANY IMPROVED FLAPS 1 TKOFS. THIS MANEUVER REQUIRES US TO ADD QUITE A BIT OF EXTRA SPD TO OUR TKOF NUMBERS. THE ATC SYS WORKED VERY WELL. WE RECEIVED ALL THE ASSISTANCE WE REQUESTED VERY PROMPTLY AND COURTEOUSLY. SUPPLEMENTAL INFO FROM ACN 267605: ATC INFORMED US OF TIRE TREAD ON RWY. OUR MAINT DETERMINED IT WAS FROM OUR MAIN LNDG GEAR. ELECTED TO PREPARE CABIN FOR POSSIBLE EVAC. RETURNED TO DEN 3000 LBS OVER MAX LNDG WT. HAD EMER EQUIP PERSONNEL LOOK FOR FIRE, NONE RPTED. WE HAD TO DO IMPROVED FLAP TKOF AT 62 DEGS F BECAUSE OF D-RATED ENGS. THIS REQUIRES A MUCH HIGHER ROTATION SPD THAN NORMAL. THIS HIGHER SPD ROTATION MAY HAVE CAUSED THE TIRE TREAD TO SHRED. THE TIRE PUNCTURED 1 'A' HYD LINE AND CAUSED OTHER DAMAGE. ADDITIONALLY, PRIOR TO TKOF, WE HAD TAXIED FROM RAMP AREA TO RWY 35R. THIS LONG TAXI MAY HAVE HEATED BRAKES OR TIRE, WHICH MAY HAVE AGGRAVATED THE ABOVE PROB.

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.