Aircraft hydraulic system B failure.

Attributes
ACN	120520
Time
Date	198908
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lax
State Reference	CA
Altitude	msl bound lower : 18000 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other other
Route In Use	arrival : profile descent arrival other enroute airway : j4
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp
Experience	flight time last 90 days : 170 flight time total : 4300 flight time type : 1200
ASRS Report	120520
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During descent into lax, coming off J4 to the civet profile descent, I noticed the system B flight control lights flicker on, then off, then back on again. We had just initiated our descent 5 mins prior. The captain was at the controls and then turned the controls over to me so that he ad the second officer could go through the emergency procedures per company sopa. Problem was noted to be a loss of B system. Procedures per company aircraft operating manual were followed; an emergency was declared and a successful ILS approach was flown to a full stop. Due to loss of pressure on brake indicator on roll-out, pneumatic brakes were used, followed by the aircraft being towed to our gate.

Original NASA ASRS Text

Title: ACFT HYDRAULIC SYSTEM B FAILURE.

Narrative: DURING DSCNT INTO LAX, COMING OFF J4 TO THE CIVET PROFILE DSCNT, I NOTICED THE SYS B FLT CONTROL LIGHTS FLICKER ON, THEN OFF, THEN BACK ON AGAIN. WE HAD JUST INITIATED OUR DSCNT 5 MINS PRIOR. THE CAPT WAS AT THE CONTROLS AND THEN TURNED THE CONTROLS OVER TO ME SO THAT HE AD THE S/O COULD GO THROUGH THE EMER PROCS PER COMPANY SOPA. PROB WAS NOTED TO BE A LOSS OF B SYS. PROCS PER COMPANY ACFT OPERATING MANUAL WERE FOLLOWED; AN EMER WAS DECLARED AND A SUCCESSFUL ILS APCH WAS FLOWN TO A FULL STOP. DUE TO LOSS OF PRESSURE ON BRAKE INDICATOR ON ROLL-OUT, PNEUMATIC BRAKES WERE USED, FOLLOWED BY THE ACFT BEING TOWED TO OUR GATE.

Data retrieved from NASA's ASRS site as of August 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.