A saab 340B in cruise at 12000 ft declared an emergency due to a low hydraulic pressure warning light followed by a passenger breathing emergency.

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Attributes
ACN	455496
Time
Date	199911
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : maf.airport
State Reference	TX
Altitude	msl single value : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : v66.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : commercial pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 1600 flight time type : 200
ASRS Report	455496
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8500 flight time type : 800
ASRS Report	455871
Events
Anomaly	aircraft equipment problem : critical cabin event : passenger illness
Independent Detector	aircraft equipment other aircraft equipment : low pressure warning other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Aircraft Passenger Human Performance
Primary Problem	Passenger Human Performance

Narrative:

Hydraulic light on. Hydraulic problem. Advised ATC to forward information to midland airport for precautionary emergency landing. Approximately 5 mins later, flight attendant advised a passenger was having difficulty in breathing. We advised approach we were declaring an emergency. We landed without incident. Paramedics met aircraft to assist medical emergency. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a saab 340B and the cause of the hydraulic low pressure warning light was the failure of the low pressure limit switch. The reporter said this switches on the electric hydraulic pump when pressure drops to 1800 psi. The reporter stated the passenger was met and treated by paramedics on arrival and appeared to be recovered. Callback conversation with reporter acn 455871 revealed the following information: the reporter stated the aircraft was a saab 340B and was not aware of the component failure that resulted in the loss of hydraulic pressure. The reporter said the report was written in the logbook and left for the mechanics.

Original NASA ASRS Text

Title: A SAAB 340B IN CRUISE AT 12000 FT DECLARED AN EMER DUE TO A LOW HYD PRESSURE WARNING LIGHT FOLLOWED BY A PAX BREATHING EMER.

Narrative: HYD LIGHT ON. HYD PROB. ADVISED ATC TO FORWARD INFO TO MIDLAND ARPT FOR PRECAUTIONARY EMER LNDG. APPROX 5 MINS LATER, FLT ATTENDANT ADVISED A PAX WAS HAVING DIFFICULTY IN BREATHING. WE ADVISED APCH WE WERE DECLARING AN EMER. WE LANDED WITHOUT INCIDENT. PARAMEDICS MET ACFT TO ASSIST MEDICAL EMER. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A SAAB 340B AND THE CAUSE OF THE HYD LOW PRESSURE WARNING LIGHT WAS THE FAILURE OF THE LOW PRESSURE LIMIT SWITCH. THE RPTR SAID THIS SWITCHES ON THE ELECTRIC HYD PUMP WHEN PRESSURE DROPS TO 1800 PSI. THE RPTR STATED THE PAX WAS MET AND TREATED BY PARAMEDICS ON ARR AND APPEARED TO BE RECOVERED. CALLBACK CONVERSATION WITH RPTR ACN 455871 REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A SAAB 340B AND WAS NOT AWARE OF THE COMPONENT FAILURE THAT RESULTED IN THE LOSS OF HYD PRESSURE. THE RPTR SAID THE RPT WAS WRITTEN IN THE LOGBOOK AND LEFT FOR THE MECHS.

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.