A B737-400 declared an emergency and diverted due to 'a' hydraulic system failure. Engine driven pump indicated high pressure and the electric pump indicated overtemp.

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Attributes
ACN	370762
Time
Date	199706
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bdl
State Reference	CT
Altitude	msl bound lower : 21000 msl bound upper : 21000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other other
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 : 5400 flight time type : 300
ASRS Report	370762
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe inflight encounter other other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After departing bradly international and leveling at FL200, the hydraulic overheat light illuminated corresponding to the 'a' system electric pump. The pump was turned off in accordance with the checklist. Soon thereafter the 'a' system pressure was noted at 3800 psi (middle of red line). At that time I positioned the 'a' system electric pump back on and turned the 'a' system engine driven pump off. The system pressure returned to normal and the overtemp light re-illuminated. I then positioned the engine driven pump back on and the electric pump off. Again the pressure was at 3800 psi and the overheat light was out. I then put both pumps to the off position and followed the 'loss of system a' checklist subsequently declared an emergency according to published company procedures and diverted to jfk without further incident.

Original NASA ASRS Text

Title: A B737-400 DECLARED AN EMER AND DIVERTED DUE TO 'A' HYD SYS FAILURE. ENG DRIVEN PUMP INDICATED HIGH PRESSURE AND THE ELECTRIC PUMP INDICATED OVERTEMP.

Narrative: AFTER DEPARTING BRADLY INTL AND LEVELING AT FL200, THE HYD OVERHEAT LIGHT ILLUMINATED CORRESPONDING TO THE 'A' SYS ELECTRIC PUMP. THE PUMP WAS TURNED OFF IN ACCORDANCE WITH THE CHKLIST. SOON THEREAFTER THE 'A' SYS PRESSURE WAS NOTED AT 3800 PSI (MIDDLE OF RED LINE). AT THAT TIME I POSITIONED THE 'A' SYS ELECTRIC PUMP BACK ON AND TURNED THE 'A' SYS ENG DRIVEN PUMP OFF. THE SYS PRESSURE RETURNED TO NORMAL AND THE OVERTEMP LIGHT RE-ILLUMINATED. I THEN POSITIONED THE ENG DRIVEN PUMP BACK ON AND THE ELECTRIC PUMP OFF. AGAIN THE PRESSURE WAS AT 3800 PSI AND THE OVERHEAT LIGHT WAS OUT. I THEN PUT BOTH PUMPS TO THE OFF POS AND FOLLOWED THE 'LOSS OF SYS A' CHKLIST SUBSEQUENTLY DECLARED AN EMER ACCORDING TO PUBLISHED COMPANY PROCS AND DIVERTED TO JFK WITHOUT FURTHER INCIDENT.

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.