A300 captain on the cadit 7 departure from atl is told to delete the speed restriction at zelan whic...

Attributes
ACN	1112251
Time
Date	201308
Local Time Of Day	1801-2400
Place
Locale Reference	ATL.Airport
State Reference	GA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Route In Use	Other Controlled
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 57 Flight Crew Total 15000 Flight Crew Type 3000
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

Departing atl runway 26L on cadit 7 departure RNAV to mpass. We turned the autopilot on at 1;000 ft with profile and navigation selected and began the slat retraction 10 knots after reaching 's' speed. After the turn to 300 degrees RNAV to mpass; ATC told us to delete the 250 KTS speed restriction at zelan. After deleting the speed the aircraft automation turned the aircraft inside of mpass. ATC advised us that 'in the future deleting the speed restriction at zelan does not mean go direct to zelan.' we indicated that the automation was flying the departure and we showed us .1 mile left of course. He indicated we were well right of course. The FMC logic apparently does not understand flying over a point after deleting a speed. We would recommend not deleting a speed until passing mpass. A contributing factor may have been changing the clean-up altitude to 1;500 ft instead of leaving it at 3;000 ft. At 1;500 ft we are closer to the airport and get to south+10 much sooner.

Original NASA ASRS Text

Title: A300 Captain on the CADIT 7 Departure from ATL is told to delete the speed restriction at ZELAN which is accomplished in the FMCG. This results in a turn direct ZELAN bypassing MPASS and an ATC admonishment.

Narrative: Departing ATL Runway 26L on CADIT 7 Departure RNAV to MPASS. We turned the autopilot on at 1;000 FT with Profile and NAV selected and began the slat retraction 10 knots after reaching 's' speed. After the turn to 300 degrees RNAV to MPASS; ATC told us to delete the 250 KTS speed restriction at ZELAN. After deleting the speed the aircraft automation turned the aircraft inside of MPASS. ATC advised us that 'In the future deleting the speed restriction at ZELAN does not mean go direct to ZELAN.' We indicated that the automation was flying the departure and we showed us .1 mile left of course. He indicated we were well Right of course. The FMC logic apparently does not understand flying over a point after deleting a speed. We would recommend not deleting a speed until passing MPASS. A contributing factor may have been changing the clean-up altitude to 1;500 FT instead of leaving it at 3;000 FT. At 1;500 FT we are closer to the airport and get to S+10 much sooner.

Data retrieved from NASA's ASRS site as of July 2013 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.

A300 captain on the cadit 7 departure from atl is told to delete the speed restriction at zelan which is accomplished in the fmcg. This results in a turn direct zelan bypassing mpass and an ATC admonishment.