Commuter aircraft states concern reference similar call signs of company aircraft.

Attributes
ACN	204514
Time
Date	199203
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ind
State Reference	IN
Altitude	msl bound lower : 2500 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ind tower : bkl
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : initial climbout : takeoff
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 7500 flight time type : 1500
ASRS Report	204514
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

As you can see by the enclosed list of the bank of flight numbers the possibility increases of mistaken call signs due to similar numbers. Especially since all begin with company identify. I almost initiated a climb from 2500 MSL based on what I thought were climb instructions for company. The controllers have enough to deal with in terms of the number and volume of departures. With the recent increase in flts in and out of ind, this use of similar call signs will eventually lead to a big mistake, either by controllers or crew members.

Original NASA ASRS Text

Title: COMMUTER ACFT STATES CONCERN REF SIMILAR CALL SIGNS OF COMPANY ACFT.

Narrative: AS YOU CAN SEE BY THE ENCLOSED LIST OF THE BANK OF FLT NUMBERS THE POSSIBILITY INCREASES OF MISTAKEN CALL SIGNS DUE TO SIMILAR NUMBERS. ESPECIALLY SINCE ALL BEGIN WITH COMPANY IDENT. I ALMOST INITIATED A CLB FROM 2500 MSL BASED ON WHAT I THOUGHT WERE CLB INSTRUCTIONS FOR COMPANY. THE CTLRS HAVE ENOUGH TO DEAL WITH IN TERMS OF THE NUMBER AND VOLUME OF DEPS. WITH THE RECENT INCREASE IN FLTS IN AND OUT OF IND, THIS USE OF SIMILAR CALL SIGNS WILL EVENTUALLY LEAD TO A BIG MISTAKE, EITHER BY CTLRS OR CREW MEMBERS.

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.