Aircraft equipment problem creates need for flight crew to have an emergency declared.

Attributes
ACN	223923
Time
Date	199210
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : atl tower : lax
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 175 flight time total : 13075 flight time type : 2150
ASRS Report	223923
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Prior to pushback in msy when auxiliary hydraulic pump was turned on to raise airstair, right hydraulic quantity went from 14 quarts to 8 quarts. Maintenance was called and log entry made. Maintenance checked and svced system and signed off logbook. After normal takeoff, climb and cruise, just prior to descent we noticed the right hydraulic quantity decreasing. The right hydraulic system was secured as per hydraulic. Quantity low or decreasing abnormal procedures. Quantity held at 6 quarts. System pumps were turned back on to configure for landing and quantity remained at 6 quarts until flaps were lowered to 40, then quantity dropped to 0. Right hydraulic system failure abnormal procedure was performed and an emergency was declared. An uneventful landing was performed on 27L atl and a gentle turn off on the last highspd was made to a full stop. We then called for a tow and informed the passenger of what happened. Maintenance arrived shortly thereafter and installed the pins in the landing gear prior to towing the aircraft to the gate.

Original NASA ASRS Text

Title: ACFT EQUIP PROBLEM CREATES NEED FOR FLC TO HAVE AN EMER DECLARED.

Narrative: PRIOR TO PUSHBACK IN MSY WHEN AUX HYD PUMP WAS TURNED ON TO RAISE AIRSTAIR, R HYD QUANTITY WENT FROM 14 QUARTS TO 8 QUARTS. MAINT WAS CALLED AND LOG ENTRY MADE. MAINT CHKED AND SVCED SYS AND SIGNED OFF LOGBOOK. AFTER NORMAL TKOF, CLB AND CRUISE, JUST PRIOR TO DSCNT WE NOTICED THE R HYD QUANTITY DECREASING. THE R HYD SYS WAS SECURED AS PER HYD. QUANTITY LOW OR DECREASING ABNORMAL PROCS. QUANTITY HELD AT 6 QUARTS. SYS PUMPS WERE TURNED BACK ON TO CONFIGURE FOR LNDG AND QUANTITY REMAINED AT 6 QUARTS UNTIL FLAPS WERE LOWERED TO 40, THEN QUANTITY DROPPED TO 0. R HYD SYS FAILURE ABNORMAL PROC WAS PERFORMED AND AN EMER WAS DECLARED. AN UNEVENTFUL LNDG WAS PERFORMED ON 27L ATL AND A GENTLE TURN OFF ON THE LAST HIGHSPD WAS MADE TO A FULL STOP. WE THEN CALLED FOR A TOW AND INFORMED THE PAX OF WHAT HAPPENED. MAINT ARRIVED SHORTLY THEREAFTER AND INSTALLED THE PINS IN THE LNDG GEAR PRIOR TO TOWING THE ACFT TO THE 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.