Corporate aircraft flight crew has problem with multi function display during taxi. This causes a di...

Attributes
ACN	365814
Time
Date	199704
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dal
State Reference	TX
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 1000
ASRS Report	365814
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe incursion : runway non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While taxiing to runway 31R at dal, we developed a problem with the multi function display. Due to thunderstorms in the area and along our route, we needed to have it working in order to display the radar on it. While taxiing we tried different things to get it back which focused too much attention to the problem. Upon arrival at the departure end of runway 31R while awaiting takeoff clearance, I continued to work on the problem since the sic was not as familiar with the equipment as I was. We were cleared 'into position and hold' which we both acknowledged to each other. Prior to getting into position, there was another transmission from the tower which I missed. I asked the sic to confirm 'position and hold' and he said we were cleared for takeoff. I asked again if we were to confirm 'position and hold' and he said we were cleared for takeoff. I asked again if we were cleared to go and he confidently said yes. After rotation the tower called and said that we had not been cleared for takeoff. The sic reported back that he thought we had been cleared. The controller said we had not, but that there was no problem, but that we were only 3 mi behind the previous departing traffic and to keep our speed back. Contributing factors to this incident were distrs caused by malfunctioning equipment and the division of attention addressing the problems. The fact that only 1 crew member could confirm or deny that takeoff clearance had been issued was a red flag that should have been recognized and then reconfirming with the tower about the clearance.

Original NASA ASRS Text

Title: CORPORATE ACFT FLC HAS PROB WITH MULTI FUNCTION DISPLAY DURING TAXI. THIS CAUSES A DISTR WHICH IMPACTS COMS AND AFTER RECEIVING POS AND HOLD CLRNC THEY TKOF WITHOUT CLRNC.

Narrative: WHILE TAXIING TO RWY 31R AT DAL, WE DEVELOPED A PROB WITH THE MULTI FUNCTION DISPLAY. DUE TO TSTMS IN THE AREA AND ALONG OUR RTE, WE NEEDED TO HAVE IT WORKING IN ORDER TO DISPLAY THE RADAR ON IT. WHILE TAXIING WE TRIED DIFFERENT THINGS TO GET IT BACK WHICH FOCUSED TOO MUCH ATTN TO THE PROB. UPON ARR AT THE DEP END OF RWY 31R WHILE AWAITING TKOF CLRNC, I CONTINUED TO WORK ON THE PROB SINCE THE SIC WAS NOT AS FAMILIAR WITH THE EQUIP AS I WAS. WE WERE CLRED 'INTO POS AND HOLD' WHICH WE BOTH ACKNOWLEDGED TO EACH OTHER. PRIOR TO GETTING INTO POS, THERE WAS ANOTHER XMISSION FROM THE TWR WHICH I MISSED. I ASKED THE SIC TO CONFIRM 'POS AND HOLD' AND HE SAID WE WERE CLRED FOR TKOF. I ASKED AGAIN IF WE WERE TO CONFIRM 'POS AND HOLD' AND HE SAID WE WERE CLRED FOR TKOF. I ASKED AGAIN IF WE WERE CLRED TO GO AND HE CONFIDENTLY SAID YES. AFTER ROTATION THE TWR CALLED AND SAID THAT WE HAD NOT BEEN CLRED FOR TKOF. THE SIC RPTED BACK THAT HE THOUGHT WE HAD BEEN CLRED. THE CTLR SAID WE HAD NOT, BUT THAT THERE WAS NO PROB, BUT THAT WE WERE ONLY 3 MI BEHIND THE PREVIOUS DEPARTING TFC AND TO KEEP OUR SPD BACK. CONTRIBUTING FACTORS TO THIS INCIDENT WERE DISTRS CAUSED BY MALFUNCTIONING EQUIP AND THE DIVISION OF ATTN ADDRESSING THE PROBS. THE FACT THAT ONLY 1 CREW MEMBER COULD CONFIRM OR DENY THAT TKOF CLRNC HAD BEEN ISSUED WAS A RED FLAG THAT SHOULD HAVE BEEN RECOGNIZED AND THEN RECONFIRMING WITH THE TWR ABOUT THE CLRNC.

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.

Corporate aircraft flight crew has problem with multi function display during taxi. This causes a distraction which impacts communications and after receiving position and hold clearance they takeoff without clearance.