Air carrier flight crew reported having difficulty complying with the IVANE5 RNAV STAR into clt; bel...

Narrative:

Flying into clt on the IVANE5 RNAV arrival and we had 18L transition selected. ATC gave us 'landing south' when they cleared us for the IVANE5. When the IVANE5 and 18L transition was selected we had a FMC message stating 'drag required after ivane'. We locked in the altitude crossing at mstrd at fl 270 so as to have a geo path for the VNAV. We were on the path and on airspeed for all the fixes leading up to and through letke at which time ATC gave us the runway 23 transition. We selected the 23 transition and we were still on the path and on airspeed. As soon as we crossed letke on the path and on airspeed; we got the 'drag required' message again. The first officer already had full speed brakes selected. The airspeed magenta bug went from 270 for letke to 250 for majic and quickly to 230 at babze. Even with full speed brakes and a 30 knot headwind the airplane would not slow down from 270 and increased to 280 and we remained on the path. It was totally impossible for the aircraft to slow down to meet the airspeed requirements at majic or babze.so as not to fly above 250 knots below 10;000 feet we elected to come off the path to slow to 250 knots. We were approximately 30 knots fast at majic and we were high and fast at babze. We notified ATC that we were not going to make the airspeed or altitude restrictions at babze. ATC asked if we could make jephs at 210 knots and 6000 feet; which we said we could; but ATC vectored us off the arrival before we got to jephs. On the next flight from clt on the same aircraft we had a 'FMC disagree vertical' message which we did put into the log book. In summation we were flying the IVANE5 arrival perfectly; and we believe that the arrival itself has a flaw that makes it extremely difficult to meet all the restrictions; or if you have 18L selected and change to runway 23; then at that time the arrival is incompatible with the aircraft limits.

Original NASA ASRS Text

Title: Air carrier flight crew reported having difficulty complying with the IVANE5 RNAV STAR into CLT; believing that it is unrealistically designed to execute in actual operations.

Narrative: Flying into CLT on the IVANE5 RNAV arrival and we had 18L transition selected. ATC gave us 'landing south' when they cleared us for the IVANE5. When the IVANE5 and 18L transition was selected we had a FMC message stating 'drag required after IVANE'. We locked in the altitude crossing at MSTRD at FL 270 so as to have a GEO path for the VNAV. We were on the path and on airspeed for all the fixes leading up to and through LETKE at which time ATC gave us the RWY 23 transition. We selected the 23 transition and we were still on the path and on airspeed. As soon as we crossed LETKE on the path and on airspeed; we got the 'drag required' message again. The First Officer already had full speed brakes selected. The airspeed magenta bug went from 270 for LETKE to 250 for MAJIC and quickly to 230 at BABZE. Even with full speed brakes and a 30 Knot headwind the airplane would not slow down from 270 and increased to 280 and we remained on the path. It was totally impossible for the aircraft to slow down to meet the airspeed requirements at MAJIC or BABZE.So as not to fly above 250 knots below 10;000 feet we elected to come off the path to slow to 250 knots. We were approximately 30 Knots fast at MAJIC and we were high and fast at BABZE. We notified ATC that we were not going to make the airspeed or altitude restrictions at BABZE. ATC asked if we could make JEPHS at 210 knots and 6000 feet; which we said we could; but ATC vectored us off the arrival before we got to JEPHS. On the next flight from CLT on the same aircraft we had a 'FMC DISAGREE VERTICAL' message which we did put into the log book. In summation we were flying the IVANE5 arrival perfectly; and we believe that the arrival itself has a flaw that makes it extremely difficult to meet all the restrictions; or if you have 18L selected and change to runway 23; then at that time the arrival is incompatible with the aircraft limits.

Data retrieved from NASA's ASRS site 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	1354807
Time
Date	201605
Local Time Of Day	0601-1200
Place
Locale Reference	CLT.Airport
State Reference	NC
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Air carrier flight crew reported having difficulty complying with the IVANE5 RNAV STAR into clt; believing that it is unrealistically designed to execute in actual operations.