A dhc-8-100 hydraulic actuator failed which dumped the number 1 hydraulic system fluid overboard as ...

Narrative:

Taking runway 24 for departure we lost number 1 hydraulic quantity when the flight taxi switch was moved to the flight position. It was detected by the loss of normal brakes; the roll spoiler inboard hydraulic caution light; and the number 1 iso valve caution light. We briefly discussed that we had lost number 1 hydraulic quantity. We decided that with nose wheel steering; deicing; and the emergency brake that we could safely return to the gate. We notified ATC and company. Then returned to the gate. The first officer made a PA and talked to the flight attendant. I was not able to use the normal brakes. The roll spoiler inboard hydraulic caution light and number 1 iso valve caution light illuminated. The number 1 hydraulic fluid gauge was at 1 quart. Maintenance told us that a hydraulic actuator had cracked and dumped fluid overboard. We discussed what had happened. Then determined that we had what we needed to return to the gate and did so.

Original NASA ASRS Text

Title: A DHC-8-100 hydraulic actuator failed which dumped the Number 1 Hydraulic System fluid overboard as the takeoff was begun; so the takeoff was rejected; but the crew had sufficient brakes and steering to taxi to the gate.

Narrative: Taking Runway 24 for departure we lost Number 1 Hydraulic Quantity when the flight taxi switch was moved to the flight position. It was detected by the loss of normal brakes; the roll spoiler inboard hydraulic caution light; and the Number 1 ISO valve caution light. We briefly discussed that we had lost Number 1 Hydraulic quantity. We decided that with nose wheel steering; deicing; and the emergency brake that we could safely return to the gate. We notified ATC and company. Then returned to the gate. The First Officer made a PA and talked to the Flight Attendant. I was not able to use the normal brakes. The Roll Spoiler inboard hydraulic caution light and Number 1 ISO Valve caution light illuminated. The number 1 hydraulic fluid gauge was at 1 quart. Maintenance told us that a hydraulic actuator had cracked and dumped fluid overboard. We discussed what had happened. Then determined that we had what we needed to return to the gate and did so.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1052464
Time
Date	201211
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Component
Aircraft Component	Hydraulic Syst Valve
Person 1
Function	Captain Pilot Flying
Experience	Flight Crew Total 4000
Events
Anomaly	Aircraft Equipment Problem Critical

A dhc-8-100 hydraulic actuator failed which dumped the number 1 hydraulic system fluid overboard as the takeoff was begun; so the takeoff was rejected; but the crew had sufficient brakes and steering to taxi to the gate.