A cpr jet failed to make its crossing restr.

Attributes
ACN	320490
Time
Date	199511
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lan
State Reference	MI
Altitude	msl bound lower : 21000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 40 flight time total : 3400 flight time type : 1550
ASRS Report	320420
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot inflight encounter : weather non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ZAU issued a clearance to cross 25 mi west of lansing at FL210. The VNAV was set using 20 mi instead of 25 mi. By the time the mistake was uncovered, ATC was asking if the crossing restr would be met. We were given a 45 degree radial turn as we leveled at FL210, 23 DME from lan. Contributing factor was a 115 KT tailwind giving a ground speed of 490 KTS. The VNAV equipment we were using only displays 1 piece of information at a time. Only distance, to/from, altitude, angle when selected. Angle was selected while descending. Next time, or from now on, both crew should review data entered in VNAV. Since the ground speed was much higher, the altitude to lose looked normal for the distance, and didn't appear to disagree with the VNAV until it was too late to make the restr.

Original NASA ASRS Text

Title: A CPR JET FAILED TO MAKE ITS XING RESTR.

Narrative: ZAU ISSUED A CLRNC TO CROSS 25 MI W OF LANSING AT FL210. THE VNAV WAS SET USING 20 MI INSTEAD OF 25 MI. BY THE TIME THE MISTAKE WAS UNCOVERED, ATC WAS ASKING IF THE XING RESTR WOULD BE MET. WE WERE GIVEN A 45 DEG RADIAL TURN AS WE LEVELED AT FL210, 23 DME FROM LAN. CONTRIBUTING FACTOR WAS A 115 KT TAILWIND GIVING A GND SPD OF 490 KTS. THE VNAV EQUIP WE WERE USING ONLY DISPLAYS 1 PIECE OF INFO AT A TIME. ONLY DISTANCE, TO/FROM, ALT, ANGLE WHEN SELECTED. ANGLE WAS SELECTED WHILE DSNDING. NEXT TIME, OR FROM NOW ON, BOTH CREW SHOULD REVIEW DATA ENTERED IN VNAV. SINCE THE GND SPD WAS MUCH HIGHER, THE ALT TO LOSE LOOKED NORMAL FOR THE DISTANCE, AND DIDN'T APPEAR TO DISAGREE WITH THE VNAV UNTIL IT WAS TOO LATE TO MAKE THE RESTR.

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.