A CL65 captain reported that pushback at dtw was inadequate due to non standard hand signals and use of intercom, causing the aircraft to be released from the tow before the brakes were set.

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Attributes
ACN	588152
Time
Date	200307
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 800
ASRS Report	588152
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : published procedure other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Company
Primary Problem	Company

Narrative:

During pushback a combination of hand signals and headset voice led to some hand signals being missed. The hand signals to set the brake was not confirmed or received by the flight crew. The aircraft was detached from the tug with the parking brake off. The aircraft started to roll and was stopped. A corrective action would be if hand signals and headsets are used at the same time all phraseology should still be spoken.

Original NASA ASRS Text

Title: A CL65 CAPT RPTED THAT PUSHBACK AT DTW WAS INADEQUATE DUE TO NON STANDARD HAND SIGNALS AND USE OF INTERCOM, CAUSING THE ACFT TO BE RELEASED FROM THE TOW BEFORE THE BRAKES WERE SET.

Narrative: DURING PUSHBACK A COMBINATION OF HAND SIGNALS AND HEADSET VOICE LED TO SOME HAND SIGNALS BEING MISSED. THE HAND SIGNALS TO SET THE BRAKE WAS NOT CONFIRMED OR RECEIVED BY THE FLT CREW. THE ACFT WAS DETACHED FROM THE TUG WITH THE PARKING BRAKE OFF. THE ACFT STARTED TO ROLL AND WAS STOPPED. A CORRECTIVE ACTION WOULD BE IF HAND SIGNALS AND HEADSETS ARE USED AT THE SAME TIME ALL PHRASEOLOGY SHOULD STILL BE SPOKEN.

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.