B727 flight crew hears clearance for descent from ATC and reads back. After descending to new altitude, ATC questions their altitude and tells them to return to previous altitude. Flight crew then hears another flight with same numbers in call sign. Had not been advised of similar call sign.

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Attributes
ACN	390350
Time
Date	199801
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lzz
State Reference	TX
Altitude	msl bound lower : 19000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	390350
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7000 flight time type : 1400
ASRS Report	390191
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation other

Narrative:

30 mi east of lampassas at XY20Z, ZHU gave air carrier X abc a descent from FL220 to FL190. After reaching FL190, center asked if we were still at FL220. We replied negative and were asked to climb back to FL220. The altitude change was apparently for another abc call sign. We were never informed of another abc on frequency and received a positive confirmation to our altitude leaving FL220 readback. No aircraft conflict noted.

Original NASA ASRS Text

Title: B727 FLC HEARS CLRNC FOR DSCNT FROM ATC AND READS BACK. AFTER DSNDING TO NEW ALT, ATC QUESTIONS THEIR ALT AND TELLS THEM TO RETURN TO PREVIOUS ALT. FLC THEN HEARS ANOTHER FLT WITH SAME NUMBERS IN CALL SIGN. HAD NOT BEEN ADVISED OF SIMILAR CALL SIGN.

Narrative: 30 MI E OF LAMPASSAS AT XY20Z, ZHU GAVE ACR X ABC A DSCNT FROM FL220 TO FL190. AFTER REACHING FL190, CTR ASKED IF WE WERE STILL AT FL220. WE REPLIED NEGATIVE AND WERE ASKED TO CLB BACK TO FL220. THE ALT CHANGE WAS APPARENTLY FOR ANOTHER ABC CALL SIGN. WE WERE NEVER INFORMED OF ANOTHER ABC ON FREQ AND RECEIVED A POSITIVE CONFIRMATION TO OUR ALT LEAVING FL220 READBACK. NO ACFT CONFLICT NOTED.

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.