Commuter light transport lost main hydraulic pressure enroute to msp. Problem discovered when gear would not lock down. Manual gear extension was successful.

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Attributes
ACN	152745
Time
Date	199008
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msp
State Reference	MN
Altitude	agl bound lower : 0 agl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msp tower : msp
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent other landing other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 3865
ASRS Report	152745
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On the final approach into msp I selected gear down and it stopped halfway with the in transit lights on. Checked the hydraulic system only to find both engine driven pumps indicating zero psi. We executed a go around and completed the manual gear extension as per crew manual checklists. This was successful and we returned and landed on the long runway with crash fire rescue equipment standing by with no further incident. I had crash fire rescue equipment follow me to the gate because my steering and braking effectiveness was limited. Ironically, this same incident happened to me in 7/90 in a different aircraft. (Same type). In both cases, the hydraulic system sprung a leak resulting in the loss of main system pressure. Manual gear extension was successful in both cases.

Original NASA ASRS Text

Title: COMMUTER LTT LOST MAIN HYDRAULIC PRESSURE ENROUTE TO MSP. PROBLEM DISCOVERED WHEN GEAR WOULD NOT LOCK DOWN. MANUAL GEAR EXTENSION WAS SUCCESSFUL.

Narrative: ON THE FINAL APCH INTO MSP I SELECTED GEAR DOWN AND IT STOPPED HALFWAY WITH THE IN TRANSIT LIGHTS ON. CHKED THE HYD SYS ONLY TO FIND BOTH ENG DRIVEN PUMPS INDICATING ZERO PSI. WE EXECUTED A GO AROUND AND COMPLETED THE MANUAL GEAR EXTENSION AS PER CREW MANUAL CHKLISTS. THIS WAS SUCCESSFUL AND WE RETURNED AND LANDED ON THE LONG RWY WITH CFR STANDING BY WITH NO FURTHER INCIDENT. I HAD CFR FOLLOW ME TO THE GATE BECAUSE MY STEERING AND BRAKING EFFECTIVENESS WAS LIMITED. IRONICALLY, THIS SAME INCIDENT HAPPENED TO ME IN 7/90 IN A DIFFERENT ACFT. (SAME TYPE). IN BOTH CASES, THE HYD SYS SPRUNG A LEAK RESULTING IN THE LOSS OF MAIN SYS PRESSURE. MANUAL GEAR EXTENSION WAS SUCCESSFUL IN BOTH CASES.

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.