<< >> NASA ASRS Report 803923, October 2008

Given an expedited required time of arrival (rta) over a downrange waypoint; dispatcher of unidentified aircraft type is concerned that performance data wasn't available to determine required speed and additional fuel burn necessary to comply with the clearance.

Attributes
ACN	803923
Time
Date	200810
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : defun
State Reference	FL
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Flight Phase	cruise : level
Person 1
Affiliation	company : air carrier
Function	other personnel
ASRS Report	803923
Events
Anomaly	aircraft equipment problem : less severe non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	other
Supplementary
Problem Areas	Flight Crew Human Performance Company ATC Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

I received a copy of a required time of arrival asking for us to be over cqy by XA39Z. Our ETA over cqy was XA44Z. When the message was sent; flight was near en route point defun. I do not know who issued this message; but there are several problems with it. The flight was 1 hour 25 mins from cqy. Since the computer cannot do variable speed flight planning it is not possible to figure how much fuel burnoff or speed this flight needs to meet the stated objective.

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Original NASA ASRS Text

Title: GIVEN AN EXPEDITED REQUIRED TIME OF ARRIVAL (RTA) OVER A DOWNRANGE WAYPOINT; DISPATCHER OF UNIDENTIFIED ACFT TYPE IS CONCERNED THAT PERFORMANCE DATA WASN'T AVAILABLE TO DETERMINE REQUIRED SPEED AND ADDITIONAL FUEL BURN NECESSARY TO COMPLY WITH THE CLRNC.

Narrative: I RECEIVED A COPY OF A REQUIRED TIME OF ARRIVAL ASKING FOR US TO BE OVER CQY BY XA39Z. OUR ETA OVER CQY WAS XA44Z. WHEN THE MESSAGE WAS SENT; FLT WAS NEAR ENRTE POINT DEFUN. I DO NOT KNOW WHO ISSUED THIS MESSAGE; BUT THERE ARE SEVERAL PROBS WITH IT. THE FLT WAS 1 HR 25 MINS FROM CQY. SINCE THE COMPUTER CANNOT DO VARIABLE SPD FLT PLANNING IT IS NOT POSSIBLE TO FIGURE HOW MUCH FUEL BURNOFF OR SPD THIS FLT NEEDS TO MEET THE STATED OBJECTIVE.

Data retrieved from NASA's ASRS site as of May 2009 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.