Aircraft equipment problem right hydraulic system failure, a broken line and clogged filter.

Attributes
ACN	309049
Time
Date	199506
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : gso
State Reference	NC
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gso
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 4800
ASRS Report	309049
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 other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

The purpose of this flight was to ferry from gso to ewr. The MD80 aircraft had diverted into gso the previous day because of a right hydraulic system failure. Repairs were made at gso and the aircraft was returned to service. After both engines were started, it was noted that the output pressure of the right engine driven hydraulic pump was below limits in both the high pressure and low pressure modes. The aircraft was shut down for further maintenance action. Maintenance made the determination of pump failure due to low hydraulic quantity during the previous system failure. Maintenance control instructed local maintenance to MEL the right engine driven pump. The right hydraulic system was checked for leaks. A normal taxi and takeoff were accomplished. Climbing through 8000 ft MSL, the right system hydraulic quantity and pressure fell rapidly to '0.' a return to gso was coordinated with ATC. Because of '0' pressure in the right system, a manual gear extension was necessary. Also, with no right hydraulic pressure, the main gear doors remained open which required a complete stop on the runway after the landing. The emergency equipment was requested. The aircraft was stopped on the runway while maintenance secured the gear and main gear doors. After further maintenance, a ruptured hydraulic line was discovered and also a filter to the right pump was in bypass position. It appears that after repairs were made that the aircraft should have been rechked for proper operation.

Original NASA ASRS Text

Title: ACFT EQUIP PROB R HYD SYS FAILURE, A BROKEN LINE AND CLOGGED FILTER.

Narrative: THE PURPOSE OF THIS FLT WAS TO FERRY FROM GSO TO EWR. THE MD80 ACFT HAD DIVERTED INTO GSO THE PREVIOUS DAY BECAUSE OF A R HYD SYS FAILURE. REPAIRS WERE MADE AT GSO AND THE ACFT WAS RETURNED TO SVC. AFTER BOTH ENGS WERE STARTED, IT WAS NOTED THAT THE OUTPUT PRESSURE OF THE R ENG DRIVEN HYD PUMP WAS BELOW LIMITS IN BOTH THE HIGH PRESSURE AND LOW PRESSURE MODES. THE ACFT WAS SHUT DOWN FOR FURTHER MAINT ACTION. MAINT MADE THE DETERMINATION OF PUMP FAILURE DUE TO LOW HYD QUANTITY DURING THE PREVIOUS SYS FAILURE. MAINT CTL INSTRUCTED LCL MAINT TO MEL THE R ENG DRIVEN PUMP. THE R HYD SYS WAS CHKED FOR LEAKS. A NORMAL TAXI AND TKOF WERE ACCOMPLISHED. CLBING THROUGH 8000 FT MSL, THE R SYS HYD QUANTITY AND PRESSURE FELL RAPIDLY TO '0.' A RETURN TO GSO WAS COORDINATED WITH ATC. BECAUSE OF '0' PRESSURE IN THE R SYS, A MANUAL GEAR EXTENSION WAS NECESSARY. ALSO, WITH NO R HYD PRESSURE, THE MAIN GEAR DOORS REMAINED OPEN WHICH REQUIRED A COMPLETE STOP ON THE RWY AFTER THE LNDG. THE EMER EQUIP WAS REQUESTED. THE ACFT WAS STOPPED ON THE RWY WHILE MAINT SECURED THE GEAR AND MAIN GEAR DOORS. AFTER FURTHER MAINT, A RUPTURED HYD LINE WAS DISCOVERED AND ALSO A FILTER TO THE R PUMP WAS IN BYPASS POS. IT APPEARS THAT AFTER REPAIRS WERE MADE THAT THE ACFT SHOULD HAVE BEEN RECHKED FOR PROPER OP.

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.