Air carrier large transport lost hydraulic pressure at top of descent.

Attributes
ACN	148556
Time
Date	199006
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 17000
ASRS Report	148556
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Approximately 140 mi from atl, inbound on the mem transition, so noticed a system quantity decreasing (large transport) quantity of the system indication was below 2.5 gals. This was immediately accompanied by a flash of the #1 low pressure light and a fluctuation of system a hydraulic pressure. I immediately initiated hydraulic system leak or loss emergency checklist and all subsequent follow-up checklists. An emergency was declared and an uneventful landing was made on runway 27R in atl. Aircraft was towed in.

Original NASA ASRS Text

Title: ACR LGT LOST HYDRAULIC PRESSURE AT TOP OF DESCENT.

Narrative: APPROX 140 MI FROM ATL, INBND ON THE MEM TRANSITION, SO NOTICED A SYS QUANTITY DECREASING (LGT) QUANTITY OF THE SYS INDICATION WAS BELOW 2.5 GALS. THIS WAS IMMEDIATELY ACCOMPANIED BY A FLASH OF THE #1 LOW PRESSURE LIGHT AND A FLUCTUATION OF SYS A HYD PRESSURE. I IMMEDIATELY INITIATED HYD SYS LEAK OR LOSS EMER CHKLIST AND ALL SUBSEQUENT FOLLOW-UP CHKLISTS. AN EMER WAS DECLARED AND AN UNEVENTFUL LNDG WAS MADE ON RWY 27R IN ATL. ACFT WAS TOWED IN.

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.