Flight crew lost altitude during start of climb to a higher altitude during descent for landing. Approach controller confused clearance to reporter and another company aircraft with similar call sign.

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Attributes
ACN	448520
Time
Date	199909
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mcb.airport
State Reference	FL
Altitude	msl bound lower : 4700 msl bound upper : 6000
Environment
Flight Conditions	IMC
Weather Elements	Thunderstorm Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mco.tracon
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : multi engine pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 5000
ASRS Report	448520
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : turbulence other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Weather ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

While being vectored for approach by mco, we were turned 180 degrees in both left and right (first to 90 degrees, then back to 270 degrees). Another aircraft (ab) and we were aircraft AC, approach was confusing call signs. Gave us 6000 ft and we were at 5000 ft. While trying to verify altitude, we were vectored into turbulence and lost 300 ft, to 4700 ft and then climbed to 6000 ft.

Original NASA ASRS Text

Title: FLC LOST ALT DURING START OF CLB TO A HIGHER ALT DURING DSCNT FOR LNDG. APCH CTLR CONFUSED CLRNC TO RPTR AND ANOTHER COMPANY ACFT WITH SIMILAR CALL SIGN.

Narrative: WHILE BEING VECTORED FOR APCH BY MCO, WE WERE TURNED 180 DEGS IN BOTH L AND R (FIRST TO 90 DEGS, THEN BACK TO 270 DEGS). ANOTHER ACFT (AB) AND WE WERE ACFT AC, APCH WAS CONFUSING CALL SIGNS. GAVE US 6000 FT AND WE WERE AT 5000 FT. WHILE TRYING TO VERIFY ALT, WE WERE VECTORED INTO TURB AND LOST 300 FT, TO 4700 FT AND THEN CLBED TO 6000 FT.

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.