ZLA assigned a wrong altitude to air carrier medium large transport, then challenged the aircraft after it had descended through the intended clearance altitude.

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Attributes
ACN	89107
Time
Date	198806
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mzb airport : san
State Reference	CA
Altitude	msl bound lower : 12000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 125 flight time total : 9000 flight time type : 4300
ASRS Report	89107
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	altitude deviation : overshoot
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

6/88, en route to san, lax center assigned a crossing restriction of cardi intersection at 10000'. On descent through approximately 12500', ATC requested our altitude. We responded out of 12500 for 10000'. They then advised us we were assigned 15000' and requested that we maintain 12000', turn left, and gave us a frequency change. After arriving in san, I called them on landline. After reviewing the tapes, they found they had assigned us 10000' by mistake. No known conflict with any other aircraft.

Original NASA ASRS Text

Title: ZLA ASSIGNED A WRONG ALT TO ACR MLG, THEN CHALLENGED THE ACFT AFTER IT HAD DESCENDED THROUGH THE INTENDED CLRNC ALT.

Narrative: 6/88, ENRTE TO SAN, LAX CENTER ASSIGNED A XING RESTRICTION OF CARDI INTXN AT 10000'. ON DSCNT THROUGH APPROX 12500', ATC REQUESTED OUR ALT. WE RESPONDED OUT OF 12500 FOR 10000'. THEY THEN ADVISED US WE WERE ASSIGNED 15000' AND REQUESTED THAT WE MAINTAIN 12000', TURN LEFT, AND GAVE US A FREQ CHANGE. AFTER ARRIVING IN SAN, I CALLED THEM ON LANDLINE. AFTER REVIEWING THE TAPES, THEY FOUND THEY HAD ASSIGNED US 10000' BY MISTAKE. NO KNOWN CONFLICT WITH ANY OTHER ACFT.

Data retrieved from NASA's ASRS site as of August 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.