DHC8-400 experiences loss of #1 hydraulic system.

Attributes
ACN	806939
Time
Date	200810
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	Q400 (Formerly Dash 8-400)
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
ASRS Report	806939
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : master caution other flight crewa
Resolutory Action	flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In cruise flight; the master caution went off. Hydraulic quantity on the #1 side indicated about 25%. I called for the #1 hydraulic isolation valve checklist and we proceeded with the checklist. After completing the checklist and notifying ATC; the flight attendants; and talking to dispatch and maintenance control; we reviewed that we would land with no brakes and antiskid. We notified the station as well as ATC that we would need to be towed off the runway. Prior to commencing the approach; while on the radio with maintenance; the 2 caution lights extinguished and the #1 engine hydraulic pump caution light illuminated. Hydraulic pressure was still full; but beginning to fluctuate. #1 hydraulic quantity was 0. The flight attendants informed us they were ready; and we commenced a visual approach; landing without incident. We came to a complete stop on the runway through use of maximum reverse and the emergency park brake. We were then towed to the gate.

Original NASA ASRS Text

Title: DHC8-400 EXPERIENCES LOSS OF #1 HYDRAULIC SYSTEM.

Narrative: IN CRUISE FLT; THE MASTER CAUTION WENT OFF. HYD QUANTITY ON THE #1 SIDE INDICATED ABOUT 25%. I CALLED FOR THE #1 HYD ISOLATION VALVE CHKLIST AND WE PROCEEDED WITH THE CHKLIST. AFTER COMPLETING THE CHKLIST AND NOTIFYING ATC; THE FLT ATTENDANTS; AND TALKING TO DISPATCH AND MAINT CTL; WE REVIEWED THAT WE WOULD LAND WITH NO BRAKES AND ANTISKID. WE NOTIFIED THE STATION AS WELL AS ATC THAT WE WOULD NEED TO BE TOWED OFF THE RWY. PRIOR TO COMMENCING THE APCH; WHILE ON THE RADIO WITH MAINT; THE 2 CAUTION LIGHTS EXTINGUISHED AND THE #1 ENG HYD PUMP CAUTION LIGHT ILLUMINATED. HYD PRESSURE WAS STILL FULL; BUT BEGINNING TO FLUCTUATE. #1 HYD QUANTITY WAS 0. THE FLT ATTENDANTS INFORMED US THEY WERE READY; AND WE COMMENCED A VISUAL APCH; LNDG WITHOUT INCIDENT. WE CAME TO A COMPLETE STOP ON THE RWY THROUGH USE OF MAX REVERSE AND THE EMER PARK BRAKE. WE WERE THEN TOWED TO THE GATE.

Data retrieved from NASA's ASRS site as of May 2009 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.