Return land mandated for air carrier widebody transport after aircraft equipment problem malfunction...

Attributes
ACN	242924
Time
Date	199306
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : nrt
State Reference	FO
Altitude	msl bound lower : 10000 msl bound upper : 21000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sql
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude landing other other
Route In Use	enroute : on vectors enroute : direct enroute airway : rjtg
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 160 flight time total : 10000 flight time type : 5000
ASRS Report	242924
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 85 flight time total : 17000 flight time type : 4000
ASRS Report	243017
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After clean up on climb out out of narita international airport, japan, lost all hydraulic fluid out of #4 hydraulic system on a widebody transport flight plan called for 8 plus hours overwater, crew made the decision to return to nrt airport. Necessary to extend wing gear, and all trailing edge flaps with alternate system. Brake source also switched to altitude system. Declared an emergency and dumped 130000 pounds fuel. Landed at 585000 pounds, maximum landing weight for aircraft. First officer flew aircraft during procedure and landing. Captain and so read checklists and reviewed alternate procedures. With complete fluid loss, hydraulic pump runs with no lubrication resulting in possible overheat/fire. All 3 crew members in concurrence on decision to return. Approach/landing uneventful. Emergency ground equipment released after landing rollout. Supplemental information from acn 243017: so first discovered problem when 'quantity low' lights illuminated on hydraulic #4 system during departure climb. Supplemental information from acn 243015: ruptured hydraulic line in right body gear well caused loss of system. Crew and procedures worked 'as advertised.'

Original NASA ASRS Text

Title: RETURN LAND MANDATED FOR ACR WDB AFTER ACFT EQUIP PROB MALFUNCTION.

Narrative: AFTER CLEAN UP ON CLBOUT OUT OF NARITA INTL ARPT, JAPAN, LOST ALL HYD FLUID OUT OF #4 HYD SYS ON A WDB FLT PLAN CALLED FOR 8 PLUS HRS OVERWATER, CREW MADE THE DECISION TO RETURN TO NRT ARPT. NECESSARY TO EXTEND WING GEAR, AND ALL TRAILING EDGE FLAPS WITH ALTERNATE SYS. BRAKE SOURCE ALSO SWITCHED TO ALT SYS. DECLARED AN EMER AND DUMPED 130000 LBS FUEL. LANDED AT 585000 LBS, MAX LNDG WT FOR ACFT. FO FLEW ACFT DURING PROC AND LNDG. CAPT AND SO READ CHKLISTS AND REVIEWED ALTERNATE PROCS. WITH COMPLETE FLUID LOSS, HYD PUMP RUNS WITH NO LUBRICATION RESULTING IN POSSIBLE OVERHEAT/FIRE. ALL 3 CREW MEMBERS IN CONCURRENCE ON DECISION TO RETURN. APCH/LNDG UNEVENTFUL. EMER GND EQUIP RELEASED AFTER LNDG ROLLOUT. SUPPLEMENTAL INFO FROM ACN 243017: SO FIRST DISCOVERED PROB WHEN 'QUANTITY LOW' LIGHTS ILLUMINATED ON HYD #4 SYS DURING DEP CLB. SUPPLEMENTAL INFO FROM ACN 243015: RUPTURED HYD LINE IN R BODY GEAR WELL CAUSED LOSS OF SYS. CREW AND PROCS WORKED 'AS ADVERTISED.'

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.