An air carrier captain reported the llbg RNAV 30 procedure could create an unstablized approach as t...

Narrative:

Llbg RNV30 approach procedures can result in unstablized approaches. While performing an RNV30 approach and turning downwind to base leg vertical speed briefly reached -2;700 FPM at 1;800 AGL. Tower commented that we 'appeared low' on approach. We were at or above the vertical path at all times. Wind aloft was about 270/32. Autopilot was trying to catch the vertical path. Due to the 3;000 ft constraint at libby the aircraft was struggling to catch the vertical path. Airspeed at the time was 150 KTS and slowing; gear down; flaps were 3; and then full. Perhaps the transition from flaps 3 to full added to the problem. This did not seem to be a problem until the libby constraint was introduced. Encourage llbg to delete the libby constraint.

Original NASA ASRS Text

Title: An Air Carrier Captain reported the LLBG RNAV 30 procedure could create an unstablized approach as the aircraft attempts to catch the vertical path after the 3;000 FT LIBBY constraint.

Narrative: LLBG RNV30 approach procedures can result in unstablized approaches. While performing an RNV30 approach and turning downwind to base leg vertical speed briefly reached -2;700 FPM at 1;800 AGL. Tower commented that we 'appeared low' on approach. We were at or above the vertical path at all times. Wind aloft was about 270/32. Autopilot was trying to catch the vertical path. Due to the 3;000 FT constraint at LIBBY the aircraft was struggling to catch the vertical path. Airspeed at the time was 150 KTS and slowing; Gear Down; Flaps were 3; and then Full. Perhaps the transition from Flaps 3 to full added to the problem. This did not seem to be a problem until the LIBBY constraint was introduced. Encourage LLBG to delete the LIBBY constraint.

Data retrieved from NASA's ASRS site as of April 2012 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	931079
Time
Date	201101
Local Time Of Day	1201-1800
Place
Locale Reference	LLBG.Airport
State Reference	FO
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Other RNV30
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy

An air carrier captain reported the llbg RNAV 30 procedure could create an unstablized approach as the aircraft attempts to catch the vertical path after the 3;000 ft libby constraint.