Commuter aircraft departs at void time issued. Unable contact controller until 2 mins later.

Attributes
ACN	225816
Time
Date	199211
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gtr
State Reference	MS
Altitude	agl bound lower : 0 agl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : cbm
Operator	common carrier : air carrier
Make Model Name	Light Transport
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 3200 flight time type : 75
ASRS Report	225816
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : unable
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Columbus approach gave us clearance void time (cvt) after issuing an IFR clearance at gtr airport at OX25 local. OX31 was cvt. After departure, we contacted columbus approach. Following sign on, they advised us that our cvt was '31' and it was now '33 3/4' (mins). We advised them that we showed '31' on our clock when we took off. Columbus approach then advised us that we needed to get our clocks checked. We acknowledged. End of story. Bottom line: approach has no way of knowing when we departed the airfield, which was OX31 (cvt).

Original NASA ASRS Text

Title: COMMUTER ACFT DEPARTS AT VOID TIME ISSUED. UNABLE CONTACT CTLR UNTIL 2 MINS LATER.

Narrative: COLUMBUS APCH GAVE US CLRNC VOID TIME (CVT) AFTER ISSUING AN IFR CLRNC AT GTR ARPT AT OX25 LCL. OX31 WAS CVT. AFTER DEP, WE CONTACTED COLUMBUS APCH. FOLLOWING SIGN ON, THEY ADVISED US THAT OUR CVT WAS '31' AND IT WAS NOW '33 3/4' (MINS). WE ADVISED THEM THAT WE SHOWED '31' ON OUR CLOCK WHEN WE TOOK OFF. COLUMBUS APCH THEN ADVISED US THAT WE NEEDED TO GET OUR CLOCKS CHKED. WE ACKNOWLEDGED. END OF STORY. BOTTOM LINE: APCH HAS NO WAY OF KNOWING WHEN WE DEPARTED THE AIRFIELD, WHICH WAS OX31 (CVT).

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.