A B737-200 in cruise at FL350 diverted due to loss of 'a' system hydraulic pressure and quantity. Ca...

Attributes
ACN	486352
Time
Date	200009
Day	Wed
Local Time Of Day	1201 To 1800
Place
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute airway : j91.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9500 flight time type : 4000
ASRS Report	486352
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : a press & qty indication other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Weather Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

At leveloff on flight from mco-bna, noticed hydraulic quantity decreasing. Due to line of thunderstorms south and east of us, ruled out landing at mco or jax. Suspecting potential loss of hydraulic system 'a,' decided not to land at tlh. After conferring with dispatch and maintenance, I elected to land at atl. We had hydraulic system 'a' fail on the way in to atl and complied with the appropriate procedures culminating in a successful full stop landing on atl runway 27R. Requested and received tug tow from runway to gate.

Original NASA ASRS Text

Title: A B737-200 IN CRUISE AT FL350 DIVERTED DUE TO LOSS OF 'A' SYS HYD PRESSURE AND QUANTITY. CAUSE UNKNOWN.

Narrative: AT LEVELOFF ON FLT FROM MCO-BNA, NOTICED HYD QUANTITY DECREASING. DUE TO LINE OF TSTMS S AND E OF US, RULED OUT LNDG AT MCO OR JAX. SUSPECTING POTENTIAL LOSS OF HYD SYS 'A,' DECIDED NOT TO LAND AT TLH. AFTER CONFERRING WITH DISPATCH AND MAINT, I ELECTED TO LAND AT ATL. WE HAD HYD SYS 'A' FAIL ON THE WAY IN TO ATL AND COMPLIED WITH THE APPROPRIATE PROCS CULMINATING IN A SUCCESSFUL FULL STOP LNDG ON ATL RWY 27R. REQUESTED AND RECEIVED TUG TOW FROM RWY TO GATE.

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.

A B737-200 in cruise at FL350 diverted due to loss of 'a' system hydraulic pressure and quantity. Cause unknown.