A climbing B727-231 experiences a loss of the 'B' system hydraulics. Return land mandated. Postflt inspection indicated the shearing of support studs holding the motor to the pump casing.

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Attributes
ACN	403473
Time
Date	199805
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : stl
State Reference	MO
Altitude	msl bound lower : 17000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude landing other other
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : flight engineer pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 20500 flight time type : 10200
ASRS Report	403473
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 130 flight time total : 2200 flight time type : 276
ASRS Report	403794
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During the climb (about FL180) the #2 'B' system hydraulic low pressure light illuminated. The circuit breaker was recycled but light stayed on. At this point the quantity was noted to be '0' and the required checklists read. ATC was notified of our intention to return to stl and vectored us to vandalia VOR and the arrival to stl. Passenger, cabin attendants and company were notified. We requested runway 30L because of the length and the fact that the 'B' system is primary source of brake pressure. Approach, landing, and taxi in normal. Cause was the failure of the studs holding the 'B' pump motor to the pump and allowing fluid to escape.

Original NASA ASRS Text

Title: A CLBING B727-231 EXPERIENCES A LOSS OF THE 'B' SYS HYDS. RETURN LAND MANDATED. POSTFLT INSPECTION INDICATED THE SHEARING OF SUPPORT STUDS HOLDING THE MOTOR TO THE PUMP CASING.

Narrative: DURING THE CLB (ABOUT FL180) THE #2 'B' SYS HYD LOW PRESSURE LIGHT ILLUMINATED. THE CIRCUIT BREAKER WAS RECYCLED BUT LIGHT STAYED ON. AT THIS POINT THE QUANTITY WAS NOTED TO BE '0' AND THE REQUIRED CHKLISTS READ. ATC WAS NOTIFIED OF OUR INTENTION TO RETURN TO STL AND VECTORED US TO VANDALIA VOR AND THE ARR TO STL. PAX, CABIN ATTENDANTS AND COMPANY WERE NOTIFIED. WE REQUESTED RWY 30L BECAUSE OF THE LENGTH AND THE FACT THAT THE 'B' SYS IS PRIMARY SOURCE OF BRAKE PRESSURE. APCH, LNDG, AND TAXI IN NORMAL. CAUSE WAS THE FAILURE OF THE STUDS HOLDING THE 'B' PUMP MOTOR TO THE PUMP AND ALLOWING FLUID TO ESCAPE.

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.