An air carrier aircraft approaching ramms intersection on the den ramms arrival was given vector off course prior to ramms and missed altitude and speed restrs because the autoplt remained engaged.

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Attributes
ACN	783199
Time
Date	200804
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl single value : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	Airbus Industrie Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : pamms
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time type : 2500
ASRS Report	783199
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Supplementary
Problem Areas	Airspace Structure Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

ATC gave a vector off course for spacing just prior to arrival fix. We could not get the crossing restr to enter properly after being reclred direct raams. I remained in a selected descent and the computer showed we were going to make the restr ok. We only had a few mi and maybe 2 mins to meet the restr. By the time I realized the computer was giving bad information and I reacted; I was not able to meet the restr. Consequently; when trying to meet the altitude; the speed increased; therefore; I missed both altitude and speed. Do not trust the automation. Always back up and verify the descent with the 3:1 rule.

Original NASA ASRS Text

Title: AN ACR ACFT APCHING RAMMS INTXN ON THE DEN RAMMS ARR WAS GIVEN VECTOR OFF COURSE PRIOR TO RAMMS AND MISSED ALT AND SPD RESTRS BECAUSE THE AUTOPLT REMAINED ENGAGED.

Narrative: ATC GAVE A VECTOR OFF COURSE FOR SPACING JUST PRIOR TO ARR FIX. WE COULD NOT GET THE XING RESTR TO ENTER PROPERLY AFTER BEING RECLRED DIRECT RAAMS. I REMAINED IN A SELECTED DSCNT AND THE COMPUTER SHOWED WE WERE GOING TO MAKE THE RESTR OK. WE ONLY HAD A FEW MI AND MAYBE 2 MINS TO MEET THE RESTR. BY THE TIME I REALIZED THE COMPUTER WAS GIVING BAD INFO AND I REACTED; I WAS NOT ABLE TO MEET THE RESTR. CONSEQUENTLY; WHEN TRYING TO MEET THE ALT; THE SPD INCREASED; THEREFORE; I MISSED BOTH ALT AND SPD. DO NOT TRUST THE AUTOMATION. ALWAYS BACK UP AND VERIFY THE DSCNT WITH THE 3:1 RULE.

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.