B737 crew was given excessive altitude changes on a noise abatement departure at sna.

Attributes
ACN	488060
Time
Date	200010
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sna.airport
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 7000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sna.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial climbout : intermediate altitude
Route In Use	departure : noise abatement departure sid : back bay 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	488060
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Airport FAA ATC Facility ATC Human Performance
Primary Problem	ATC Human Performance
Situations
ATC Facility	procedure or policy : sna.tower
Airport	procedure or policy : sna.airport

Narrative:

Change in takeoff altitude. Was given clearance for the BCKBY2 departure, maintain 7000 ft. When cleared for takeoff, tower changed altitude clearance to maintain 4000 ft. After takeoff, tower changed clearance to maintain 3000 ft. We complied with every other aspect of the runway 19R published noise procedure.

Original NASA ASRS Text

Title: B737 CREW WAS GIVEN EXCESSIVE ALT CHANGES ON A NOISE ABATEMENT DEP AT SNA.

Narrative: CHANGE IN TKOF ALT. WAS GIVEN CLRNC FOR THE BCKBY2 DEP, MAINTAIN 7000 FT. WHEN CLRED FOR TKOF, TWR CHANGED ALT CLRNC TO MAINTAIN 4000 FT. AFTER TKOF, TWR CHANGED CLRNC TO MAINTAIN 3000 FT. WE COMPLIED WITH EVERY OTHER ASPECT OF THE RWY 19R PUBLISHED NOISE PROC.

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.