An airbus 320 in cruise at FL330 diverted due to ECAM 'hydraulic yellow reservoir low level' warning. The ECAM procedure was not completed due to conflict between annunciations and flight manual.

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Attributes
ACN	599989
Time
Date	200311
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 33000
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 11000 flight time type : 500
ASRS Report	599989
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem flight crew : diverted to another airport
Consequence	other other
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

250 mi west of ZZZ, we got a 'hydraulic Y reservoir lo level' ECAM. There were 2 blue to-do items listed below. 'Ptu off' and 'yellow engine #2 pump off.' we complied and got another ECAM, 'hydraulic Y engine pump lo pr.' below that it said 'Y system lo pr.' no to do items were listed. We cycled through the system pages until we got the status page which showed what appears on the bottom of FM page 7-123. We did not declare an emergency, but we did have the tower roll the equipment. We spoke to dispatch and maintenance and, after the first officer and I discussed it, we decided not to do the items on the status page because we felt it would result in us blowing out the rest of the yellow system quantity and we would be dealing with another ECAM on short approach. None of the ECAM annunciations we got match what is in the FM on pages 7-123 and 7-126 which confused us a lot. Also, although I believe we did the right thing, I still don't feel comfortable 'not' completing an ECAM. I spoke to captain X at ZZZ2 who said he would do a follow up, possibly in a simulator.

Original NASA ASRS Text

Title: AN AIRBUS 320 IN CRUISE AT FL330 DIVERTED DUE TO ECAM 'HYD YELLOW RESERVOIR LOW LEVEL' WARNING. THE ECAM PROC WAS NOT COMPLETED DUE TO CONFLICT BTWN ANNUNCIATIONS AND FLT MANUAL.

Narrative: 250 MI W OF ZZZ, WE GOT A 'HYD Y RESERVOIR LO LEVEL' ECAM. THERE WERE 2 BLUE TO-DO ITEMS LISTED BELOW. 'PTU OFF' AND 'YELLOW ENG #2 PUMP OFF.' WE COMPLIED AND GOT ANOTHER ECAM, 'HYD Y ENG PUMP LO PR.' BELOW THAT IT SAID 'Y SYS LO PR.' NO TO DO ITEMS WERE LISTED. WE CYCLED THROUGH THE SYS PAGES UNTIL WE GOT THE STATUS PAGE WHICH SHOWED WHAT APPEARS ON THE BOTTOM OF FM PAGE 7-123. WE DID NOT DECLARE AN EMER, BUT WE DID HAVE THE TWR ROLL THE EQUIP. WE SPOKE TO DISPATCH AND MAINT AND, AFTER THE FO AND I DISCUSSED IT, WE DECIDED NOT TO DO THE ITEMS ON THE STATUS PAGE BECAUSE WE FELT IT WOULD RESULT IN US BLOWING OUT THE REST OF THE YELLOW SYS QUANTITY AND WE WOULD BE DEALING WITH ANOTHER ECAM ON SHORT APCH. NONE OF THE ECAM ANNUNCIATIONS WE GOT MATCH WHAT IS IN THE FM ON PAGES 7-123 AND 7-126 WHICH CONFUSED US A LOT. ALSO, ALTHOUGH I BELIEVE WE DID THE RIGHT THING, I STILL DON'T FEEL COMFORTABLE 'NOT' COMPLETING AN ECAM. I SPOKE TO CAPT X AT ZZZ2 WHO SAID HE WOULD DO A FOLLOW UP, POSSIBLY IN A SIMULATOR.

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.