A descending air carrier flight crew miscalculates arrival crossing restr, and cannot notify ATC due to frequency congestion. There apparently was no conflicting traffic because of no ATC follow-up.

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Attributes
ACN	390320
Time
Date	199801
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 11000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 12000 flight time type : 7000
ASRS Report	390320
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On approach into clt we missed a crossing restr at 11000 ft 250 KTS. We miscalculated the descent rate and tailwind to the approach fix and when we saw our error, we tried to call approach control. The frequency was busy and never got to tell them. When they did call us, no mention was made about the restr and we saw no conflict because of the crossing restr. In the future we're going to be more aware of altitude restrs and descent rates (leave cruise earlier).

Original NASA ASRS Text

Title: A DSNDING ACR FLC MISCALCULATES ARR XING RESTR, AND CANNOT NOTIFY ATC DUE TO FREQ CONGESTION. THERE APPARENTLY WAS NO CONFLICTING TFC BECAUSE OF NO ATC FOLLOW-UP.

Narrative: ON APCH INTO CLT WE MISSED A XING RESTR AT 11000 FT 250 KTS. WE MISCALCULATED THE DSCNT RATE AND TAILWIND TO THE APCH FIX AND WHEN WE SAW OUR ERROR, WE TRIED TO CALL APCH CTL. THE FREQ WAS BUSY AND NEVER GOT TO TELL THEM. WHEN THEY DID CALL US, NO MENTION WAS MADE ABOUT THE RESTR AND WE SAW NO CONFLICT BECAUSE OF THE XING RESTR. IN THE FUTURE WE'RE GOING TO BE MORE AWARE OF ALT RESTRS AND DSCNT RATES (LEAVE CRUISE EARLIER).

Data retrieved from NASA's ASRS site as of July 2007 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.