B737 flight crew experiences hydraulic system 'a' failure during visual approach and after complying with procedures; make uneventful landing with tow to the gate.

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Attributes
ACN	776352
Time
Date	200803
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government other
Function	oversight : pic
ASRS Report	776352
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	776351
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : hyd 'a' low pressure other flight crewa other flight crewb
Resolutory Action	flight crew : executed go around flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

On a visual approach both master caution lights and both 'a' system hydraulic low pressure lights illuminated. Hydraulic quantity reading was zero. We broke off the approach and ran the checklist. After completing the checklist and talking with the appropriate people we made an uneventful landing or runway 8R. Company towed us from runway to gate. Emergency declared with ATC.

Original NASA ASRS Text

Title: B737 FLT CREW EXPERIENCES HYDRAULIC SYSTEM 'A' FAILURE DURING VISUAL APPROACH AND AFTER COMPLYING WITH PROCEDURES; MAKE UNEVENTFUL LANDING WITH TOW TO THE GATE.

Narrative: ON A VISUAL APCH BOTH MASTER CAUTION LIGHTS AND BOTH 'A' SYS HYD LOW PRESSURE LIGHTS ILLUMINATED. HYD QUANTITY READING WAS ZERO. WE BROKE OFF THE APCH AND RAN THE CHKLIST. AFTER COMPLETING THE CHKLIST AND TALKING WITH THE APPROPRIATE PEOPLE WE MADE AN UNEVENTFUL LNDG OR RWY 8R. COMPANY TOWED US FROM RWY TO GATE. EMER DECLARED WITH ATC.

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.