Medium large transport has hydraulic system malfunction indication during cruise and the flight crew were able to restore the system to normal. Initial first step selected was inappropriate.

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Attributes
ACN	280476
Time
Date	199408
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : air
State Reference	OH
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	MD-82
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : j110
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 13000
ASRS Report	280476
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	aircraft : equipment problem dissipated flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Subject: right hydraulic system failure. Aug/xx/94 flight phx to jfk, aircraft (MD82) at cruise altitude FL330 a 'right reverse accumulator low light' came. Following the non-normal procedure we placed the hydraulic pump control switch to 'hi.' at that the quantity gauge dropped to zero. The pressure dropped to zero and all related system lights came on. I called for the hydraulic fluid loss checklist followed by the right hydraulic system fail checklist. On further observation the first officer and I noted the quantity gauge had a negative value and was pointing almost to the 19 quart level. I called the mci maintenance coordinator MD80. He said that it sounded like a gauge servo failure, but that would not explain the loss of pressure. Not knowing where my fluid was for sure I asked the first officer to return the hydraulic pump control switch to the low position. At this time the quantity and the pressure returned to normal. After a reasonable time we reset all flight controls to their normal position. Landing and taxi in was normal. No further fluid loss was noted. I suspect we may have had air in the system and somehow we purged it out.

Original NASA ASRS Text

Title: MLG HAS HYD SYS MALFUNCTION INDICATION DURING CRUISE AND THE FLC WERE ABLE TO RESTORE THE SYS TO NORMAL. INITIAL FIRST STEP SELECTED WAS INAPPROPRIATE.

Narrative: SUBJECT: R HYD SYS FAILURE. AUG/XX/94 FLT PHX TO JFK, ACFT (MD82) AT CRUISE ALT FL330 A 'R REVERSE ACCUMULATOR LOW LIGHT' CAME. FOLLOWING THE NON-NORMAL PROC WE PLACED THE HYD PUMP CTL SWITCH TO 'HI.' AT THAT THE QUANTITY GAUGE DROPPED TO ZERO. THE PRESSURE DROPPED TO ZERO AND ALL RELATED SYS LIGHTS CAME ON. I CALLED FOR THE HYD FLUID LOSS CHKLIST FOLLOWED BY THE R HYD SYS FAIL CHKLIST. ON FURTHER OBSERVATION THE FO AND I NOTED THE QUANTITY GAUGE HAD A NEGATIVE VALUE AND WAS POINTING ALMOST TO THE 19 QUART LEVEL. I CALLED THE MCI MAINT COORDINATOR MD80. HE SAID THAT IT SOUNDED LIKE A GAUGE SERVO FAILURE, BUT THAT WOULD NOT EXPLAIN THE LOSS OF PRESSURE. NOT KNOWING WHERE MY FLUID WAS FOR SURE I ASKED THE FO TO RETURN THE HYD PUMP CTL SWITCH TO THE LOW POS. AT THIS TIME THE QUANTITY AND THE PRESSURE RETURNED TO NORMAL. AFTER A REASONABLE TIME WE RESET ALL FLT CTLS TO THEIR NORMAL POS. LNDG AND TAXI IN WAS NORMAL. NO FURTHER FLUID LOSS WAS NOTED. I SUSPECT WE MAY HAVE HAD AIR IN THE SYS AND SOMEHOW WE PURGED IT OUT.

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.