<< >> NASA ASRS Report 332081, March 1996

Loss of right hydraulic system pressure and fluid. Flight continued because the left system was normal and only detrimental effect was lack of rudder augmentation and reduced nosewheel steering capability.

Attributes
ACN	332081
Time
Date	199603
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl tower : jfk
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 150 flight time total : 11600 flight time type : 8600
ASRS Report	332081
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

In cruise flight, annunciator indications of loss of right hydraulic system pressure illuminated. A check of the pressure and quantity gauges confirmed that the right hydraulic quantity gauge indicated virtually no fluid in the system and the pressure gauge read 0 psi. The left hydraulic system remained normal, as did both hydraulic brake reservoirs. Normal flight controls are not hydraulic pwred (with the exception of rudder augmentation), so the aircraft was operating normally. After a radio conversation with our dispatcher and consultation with maintenance control, we were informed that a 15 percent degradation in nosewheel steering was the only negative impact we would experience. All pertinent checklists were accomplished and I made the decision to continue the flight to the destination airport (dtw).

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Original NASA ASRS Text

Title: LOSS OF R HYD SYS PRESSURE AND FLUID. FLT CONTINUED BECAUSE THE L SYS WAS NORMAL AND ONLY DETRIMENTAL EFFECT WAS LACK OF RUDDER AUGMENTATION AND REDUCED NOSEWHEEL STEERING CAPABILITY.

Narrative: IN CRUISE FLT, ANNUNCIATOR INDICATIONS OF LOSS OF R HYD SYS PRESSURE ILLUMINATED. A CHK OF THE PRESSURE AND QUANTITY GAUGES CONFIRMED THAT THE R HYD QUANTITY GAUGE INDICATED VIRTUALLY NO FLUID IN THE SYS AND THE PRESSURE GAUGE READ 0 PSI. THE L HYD SYS REMAINED NORMAL, AS DID BOTH HYD BRAKE RESERVOIRS. NORMAL FLT CTLS ARE NOT HYD PWRED (WITH THE EXCEPTION OF RUDDER AUGMENTATION), SO THE ACFT WAS OPERATING NORMALLY. AFTER A RADIO CONVERSATION WITH OUR DISPATCHER AND CONSULTATION WITH MAINT CTL, WE WERE INFORMED THAT A 15 PERCENT DEGRADATION IN NOSEWHEEL STEERING WAS THE ONLY NEGATIVE IMPACT WE WOULD EXPERIENCE. ALL PERTINENT CHKLISTS WERE ACCOMPLISHED AND I MADE THE DECISION TO CONTINUE THE FLT TO THE DEST ARPT (DTW).

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.