A departing DHC8 lost hydraulic pressure during flap. An emergency was declared with return to land....

Attributes
ACN	716865
Time
Date	200611
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : atp pilot : cfi
Experience	flight time last 90 days : 90 flight time total : 1975 flight time type : 90
ASRS Report	716865
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : caution lights
Resolutory Action	flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff from ZZZ; at flap retraction altitude; after engaging flaps 0 degrees; we had a complete loss of #1 hydraulic pressure. This caused flaps to stop between 0 degrees and 5 degrees; as well as #1 engine hydraulic pump caution light and other #1 hydraulic system failure caution lights. After completing the after takeoff check; we complied with the QRH procedures for #1 engine hydraulic pump failure. After this; we declared an emergency with ATC; notified them of our return to ZZZ; and that we would be stopping on the runway due to probable loss of anti-skid/normal braking and nose steering. We then notified the flight attendant and passenger of the situation; briefed the approach and flapless landing; and returned to ZZZ. We also talked to dispatch and maintenance to verify all appropriate actions were taken. As we approached final; I noticed we had #1 hydraulic pressure and that all caution lights were out. I executed a flapless landing without incident and had normal braking on the rollout. We stopped on the runway. I decided to have the aircraft towed to the gate as I didn't want to lose #1 hydraulic pressure again and have braking problems on a congested ramp.

Original NASA ASRS Text

Title: A DEPARTING DHC8 LOST HYD PRESSURE DURING FLAP. AN EMER WAS DECLARED WITH RETURN TO LAND. HYD PRESSURE RETURNED TO NORMAL.

Narrative: AFTER TKOF FROM ZZZ; AT FLAP RETRACTION ALT; AFTER ENGAGING FLAPS 0 DEGS; WE HAD A COMPLETE LOSS OF #1 HYD PRESSURE. THIS CAUSED FLAPS TO STOP BTWN 0 DEGS AND 5 DEGS; AS WELL AS #1 ENG HYD PUMP CAUTION LIGHT AND OTHER #1 HYD SYS FAILURE CAUTION LIGHTS. AFTER COMPLETING THE AFTER TKOF CHK; WE COMPLIED WITH THE QRH PROCS FOR #1 ENG HYD PUMP FAILURE. AFTER THIS; WE DECLARED AN EMER WITH ATC; NOTIFIED THEM OF OUR RETURN TO ZZZ; AND THAT WE WOULD BE STOPPING ON THE RWY DUE TO PROBABLE LOSS OF ANTI-SKID/NORMAL BRAKING AND NOSE STEERING. WE THEN NOTIFIED THE FLT ATTENDANT AND PAX OF THE SITUATION; BRIEFED THE APCH AND FLAPLESS LNDG; AND RETURNED TO ZZZ. WE ALSO TALKED TO DISPATCH AND MAINT TO VERIFY ALL APPROPRIATE ACTIONS WERE TAKEN. AS WE APCHED FINAL; I NOTICED WE HAD #1 HYD PRESSURE AND THAT ALL CAUTION LIGHTS WERE OUT. I EXECUTED A FLAPLESS LNDG WITHOUT INCIDENT AND HAD NORMAL BRAKING ON THE ROLLOUT. WE STOPPED ON THE RWY. I DECIDED TO HAVE THE ACFT TOWED TO THE GATE AS I DIDN'T WANT TO LOSE #1 HYD PRESSURE AGAIN AND HAVE BRAKING PROBS ON A CONGESTED RAMP.

Data retrieved from NASA's ASRS site as of January 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.

A departing DHC8 lost hydraulic pressure during flap. An emergency was declared with return to land. Hydraulic pressure returned to normal.