DHC8 flight crew has #2 hydraulic failure; declares emergency; diverts and lands.

Attributes
ACN	696719
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl bound lower : 16000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	Dash 8-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 79 flight time total : 3430 flight time type : 1805
ASRS Report	696719
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : master caution other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : landed as precaution
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

While en route; we just completed visual approach briefing and the in-range checklist was called for. After flow was completed by first officer; he began reading checklist. Noted master caution for rudder full pressure; #2 rudder hydraulic; and roll spoiler outboard hydraulic caution lights illuminated. Discovered #2 hydraulic quantity showing zero. Requested to enter holding at VOR and performed cfm checklists. Contacted dispatch through operations and notified of situation. Agreed to return to ZZZ for landing due to manual gear extension; mountainous terrain; and displaced runway environment. Coordination through operations; maintenance staff; and dispatch. Emergency declared and vectored for visual approach to runway with crash fire rescue equipment standing by. All checklists complete and gear locked down by alternate gear extension procedure. Uneventful landing to full stop on runway. All gear pinned by flight crew. Maintenance staff arrived shortly thereafter and towed aircraft to gate with all passenger on board. Passenger deplaned and in care of gate agents and supervisors. Aircraft turned over to maintenance staff after write-ups in aml. Aircraft swap and continued flight.

Original NASA ASRS Text

Title: DHC8 FLT CREW HAS #2 HYD FAILURE; DECLARES EMER; DIVERTS AND LANDS.

Narrative: WHILE ENRTE; WE JUST COMPLETED VISUAL APCH BRIEFING AND THE IN-RANGE CHKLIST WAS CALLED FOR. AFTER FLOW WAS COMPLETED BY FO; HE BEGAN READING CHKLIST. NOTED MASTER CAUTION FOR RUDDER FULL PRESSURE; #2 RUDDER HYD; AND ROLL SPOILER OUTBOARD HYD CAUTION LIGHTS ILLUMINATED. DISCOVERED #2 HYD QUANTITY SHOWING ZERO. REQUESTED TO ENTER HOLDING AT VOR AND PERFORMED CFM CHKLISTS. CONTACTED DISPATCH THROUGH OPS AND NOTIFIED OF SIT. AGREED TO RETURN TO ZZZ FOR LNDG DUE TO MANUAL GEAR EXTENSION; MOUNTAINOUS TERRAIN; AND DISPLACED RWY ENVIRONMENT. COORD THROUGH OPS; MAINT STAFF; AND DISPATCH. EMER DECLARED AND VECTORED FOR VISUAL APCH TO RWY WITH CFR STANDING BY. ALL CHKLISTS COMPLETE AND GEAR LOCKED DOWN BY ALTERNATE GEAR EXTENSION PROC. UNEVENTFUL LNDG TO FULL STOP ON RWY. ALL GEAR PINNED BY FLT CREW. MAINT STAFF ARRIVED SHORTLY THEREAFTER AND TOWED ACFT TO GATE WITH ALL PAX ON BOARD. PAX DEPLANED AND IN CARE OF GATE AGENTS AND SUPVRS. ACFT TURNED OVER TO MAINT STAFF AFTER WRITE-UPS IN AML. ACFT SWAP AND CONTINUED FLT.

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.