<< >> NASA ASRS Report 132761, January 1990

Hydraulic system gave unusual indications during takeoff but returned to normal. At cruise, hydraulic quantity dropped. Return land.

Attributes
ACN	132761
Time
Date	199001
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : dag
State Reference	CA
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Experience	flight time last 90 days : 217 flight time total : 3940 flight time type : 412
ASRS Report	132761
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Before takeoff all hydraulic indications and operations were normal. On takeoff when landing gear was retracted the green hydraulic level dropped to the point where 'level low' light and 'pressure low' light appeared. Landing gear was retracted normally without any complications and green hydraulics returned to the normal indications. Once in cruise flight at 29,000', southwest of las vegas, the green hydraulics dropped below the caution point. All checklists were completed and then proceeded back to los angeles. Fuel was dumped to maximum landing weight. On landing approach all checklists were completed and the green hydraulics level were in the normal range. Knowing that with landing gear extension there would be an increase of the hydraulic level, the system was turned on and the landing gear was extended normally, green hydraulics were in normal range. Landing was made normal and proceeded back to gate.

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Original NASA ASRS Text

Title: HYDRAULIC SYSTEM GAVE UNUSUAL INDICATIONS DURING TKOF BUT RETURNED TO NORMAL. AT CRUISE, HYDRAULIC QUANTITY DROPPED. RETURN LAND.

Narrative: BEFORE TKOF ALL HYDRAULIC INDICATIONS AND OPERATIONS WERE NORMAL. ON TKOF WHEN LNDG GEAR WAS RETRACTED THE GREEN HYDRAULIC LEVEL DROPPED TO THE POINT WHERE 'LEVEL LOW' LIGHT AND 'PRESSURE LOW' LIGHT APPEARED. LNDG GEAR WAS RETRACTED NORMALLY WITHOUT ANY COMPLICATIONS AND GREEN HYDRAULICS RETURNED TO THE NORMAL INDICATIONS. ONCE IN CRUISE FLT AT 29,000', SW OF LAS VEGAS, THE GREEN HYDRAULICS DROPPED BELOW THE CAUTION POINT. ALL CHECKLISTS WERE COMPLETED AND THEN PROCEEDED BACK TO LOS ANGELES. FUEL WAS DUMPED TO MAX LNDG WEIGHT. ON LNDG APCH ALL CHECKLISTS WERE COMPLETED AND THE GREEN HYDRAULICS LEVEL WERE IN THE NORMAL RANGE. KNOWING THAT WITH LNDG GEAR EXTENSION THERE WOULD BE AN INCREASE OF THE HYDRAULIC LEVEL, THE SYSTEM WAS TURNED ON AND THE LNDG GEAR WAS EXTENDED NORMALLY, GREEN HYDRAULICS WERE IN NORMAL RANGE. LNDG WAS MADE NORMAL AND PROCEEDED BACK TO GATE.

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.