Btr ramp construction appeared to block south ramp taxiways to runway 4L so a crew taxied from the r...

Narrative:

We were instructed to 'taxi to 4L via alpha; behind the 727.' alpha does not connect to ramp; took most direct route to alpha (via delta). It appeared all other connections between ramp and alpha toward 4L were blocked by construction. On delta; ground control advised we were going wrong direction. He wanted us to pass behind the parked 727 on the ramp behind us; then on an unnamed taxiway that we could not see behind the parked 727. We were given new taxi clearance; and we continued with out further delay. Misunderstanding between what was said by ATC and what was understood by the flight crew; also poor airport diagram and lack of special directions. There were no special directions issued for the construction. Notams mentioned alpha being closed at taxiway charlie; but charlie is not labeled on the commercial charts airport diagram. Nothing was mentioned on the ATIS. Both of these would have helped situational awareness. More specific directions from ATC stating 'there is an unmarked taxiway behind the parked 727 on the ramp; pass to the right of the 727; proceed on unmarked; unnamed taxiway; then join alpha to 4L.

Original NASA ASRS Text

Title: BTR ramp construction appeared to block south ramp taxiways to Runway 4L so a crew taxied from the ramp on Taxiway D to Taxiway A south. Taxiway C is not defined on any airport diagrams event though it was part of the taxi clearance.

Narrative: We were instructed to 'taxi to 4L via Alpha; behind the 727.' Alpha does not connect to ramp; took most direct route to Alpha (via Delta). It appeared all other connections between ramp and Alpha toward 4L were blocked by construction. On Delta; Ground Control advised we were going wrong direction. He wanted us to pass behind the parked 727 on the ramp behind us; then on an unnamed taxiway that we could not see behind the parked 727. We were given new taxi clearance; and we continued with out further delay. Misunderstanding between what was said by ATC and what was understood by the flight crew; also poor airport diagram and lack of special directions. There were no special directions issued for the construction. NOTAMs mentioned Alpha being closed at Taxiway Charlie; but Charlie is not labeled on the Commercial Charts Airport Diagram. Nothing was mentioned on the ATIS. Both of these would have helped situational awareness. More specific directions from ATC stating 'there is an unmarked taxiway behind the parked 727 on the ramp; pass to the right of the 727; proceed on unmarked; unnamed taxiway; then join Alpha to 4L.

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.

Attributes
ACN	1033257
Time
Date	201208
Local Time Of Day	0601-1200
Place
Locale Reference	BTR.Airport
State Reference	LA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Aero Charts
Person 1
Function	Pilot Not Flying First Officer
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Ground Incursion Taxiway

Btr ramp construction appeared to block south ramp taxiways to runway 4L so a crew taxied from the ramp on taxiway D to taxiway a south. Taxiway C is not defined on any airport diagrams event though it was part of the taxi clearance.