B767-300 suffers loss of center air driven hydraulic pump on takeoff.

Attributes
ACN	760325
Time
Date	200711
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 27000 flight time type : 8000
ASRS Report	760325
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On takeoff rotation center hydraulic air demand pump failed. Normal takeoff but slightly longer gear retraction. Climbed out and departed terminal area. Ran irregular checklist and found pump to be inoperative in both automatic and on position. Contacted maintenance and dispatch. Recycled pump circuit breaker per maintenance; no help. Captain made decision to return to ZZZ for maintenance. Dumped 10000 pounds of fuel at FL300; and requested full length of runway. WX was VFR. Landed 17000 pounds over maximum landing weight. Landing was smooth with normal turn off and normal brake temperatures. Landing was at a weight lower than performance limit weight (360000 pounds with air demand pump inoperative); and runway limit weight (420000 pounds). Returned to gate.

Original NASA ASRS Text

Title: B767-300 SUFFERS LOSS OF CENTER AIR DRIVEN HYDRAULIC PUMP ON TKOF.

Narrative: ON TKOF ROTATION CTR HYD AIR DEMAND PUMP FAILED. NORMAL TKOF BUT SLIGHTLY LONGER GEAR RETRACTION. CLBED OUT AND DEPARTED TERMINAL AREA. RAN IRREGULAR CHKLIST AND FOUND PUMP TO BE INOP IN BOTH AUTO AND ON POS. CONTACTED MAINT AND DISPATCH. RECYCLED PUMP CIRCUIT BREAKER PER MAINT; NO HELP. CAPT MADE DECISION TO RETURN TO ZZZ FOR MAINT. DUMPED 10000 LBS OF FUEL AT FL300; AND REQUESTED FULL LENGTH OF RWY. WX WAS VFR. LANDED 17000 LBS OVER MAX LNDG WT. LNDG WAS SMOOTH WITH NORMAL TURN OFF AND NORMAL BRAKE TEMPS. LNDG WAS AT A WT LOWER THAN PERFORMANCE LIMIT WT (360000 LBS WITH AIR DEMAND PUMP INOP); AND RWY LIMIT WT (420000 LBS). RETURNED TO GATE.

Data retrieved from NASA's ASRS site as of January 2009 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.