B737-300 flight crew was issued a runway change while descending via the eagul arrival. Flight crew failed to maintain the new cleared altitude; and continued to descend via the programmed arrival.

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Attributes
ACN	782456
Time
Date	200804
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	msl single value : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : p50.tracon
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : eagul
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 180 flight time type : 13000
ASRS Report	782456
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

On the arrival at 9000 ft prior to badne; LNAV next to queny; we had been given; 'descend via the eagul arrival; expect runway 8.' subsequently; we were told 'expect vectors for runway 7R.' we were not given a vector off the arrival at that time. Hence; we descended to cross queny at 8000 ft and 210 KTS. The controller told us to climb back to 9000 ft as 'expect vectors' for the other runway had superseded 'descend via the arrival.' we were busy changing ILS frequency and FMS runway and may have missed his saying 'maintain 9000 ft' but neither of us heard it if he did. The controller said 'no problem' but I felt I should file this anyway.

Original NASA ASRS Text

Title: B737-300 FLT CREW WAS ISSUED A RWY CHANGE WHILE DESCENDING VIA THE EAGUL ARRIVAL. FLT CREW FAILED TO MAINTAIN THE NEW CLEARED ALT; AND CONTINUED TO DESCEND VIA THE PROGRAMMED ARRIVAL.

Narrative: ON THE ARR AT 9000 FT PRIOR TO BADNE; LNAV NEXT TO QUENY; WE HAD BEEN GIVEN; 'DSND VIA THE EAGUL ARR; EXPECT RWY 8.' SUBSEQUENTLY; WE WERE TOLD 'EXPECT VECTORS FOR RWY 7R.' WE WERE NOT GIVEN A VECTOR OFF THE ARR AT THAT TIME. HENCE; WE DSNDED TO CROSS QUENY AT 8000 FT AND 210 KTS. THE CTLR TOLD US TO CLB BACK TO 9000 FT AS 'EXPECT VECTORS' FOR THE OTHER RWY HAD SUPERSEDED 'DSND VIA THE ARR.' WE WERE BUSY CHANGING ILS FREQ AND FMS RWY AND MAY HAVE MISSED HIS SAYING 'MAINTAIN 9000 FT' BUT NEITHER OF US HEARD IT IF HE DID. THE CTLR SAID 'NO PROB' BUT I FELT I SHOULD FILE THIS ANYWAY.

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.