A DC9 declared an emergency due to loss of 'a' hydraulic system pressure and quantity.

Attributes
ACN	366342
Time
Date	199704
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : cyn
State Reference	DC
Altitude	msl bound lower : 10600 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent other other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time total : 8000
ASRS Report	366342
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation

Narrative:

Descent into ewr and leveling at 11000 ft at holey intersection I descended about 300-400 ft below 11000 ft. We had an emergency in progress. The 'a' system hydraulic was inoperative. First officer was flying and captain was taking care of the emergency. We asked ATC about the altitude error and the controllers said not to worry about it.

Original NASA ASRS Text

Title: A DC9 DECLARED AN EMER DUE TO LOSS OF 'A' HYD SYS PRESSURE AND QUANTITY.

Narrative: DSCNT INTO EWR AND LEVELING AT 11000 FT AT HOLEY INTXN I DSNDED ABOUT 300-400 FT BELOW 11000 FT. WE HAD AN EMER IN PROGRESS. THE 'A' SYS HYD WAS INOP. FO WAS FLYING AND CAPT WAS TAKING CARE OF THE EMER. WE ASKED ATC ABOUT THE ALT ERROR AND THE CTLRS SAID NOT TO WORRY ABOUT IT.

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.