Flight crew of a cpr jet failed to make a descent crossing altitude restr due to a lack of monitoring the FMS mode and aircraft actual position during descent.

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Attributes
ACN	383210
Time
Date	199710
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : tnv
State Reference	TX
Altitude	msl bound lower : 10000 msl bound upper : 13000
Environment
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : zhu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7950 flight time type : 200
ASRS Report	383210
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft was cleared to cross marit intersection at and maintain 10000 ft MSL. I did not realize that FMS had gone into dr mode and we were 7 mi from crossing restr instead of the 20 mi showing on the FMS. PNF realized problem when setting up outbound radial on #2 navigation receiver and saw distance to tnv and intersection did not add up with FMS distance. I increased rate of descent but missed the crossing restr by several hundred ft. Contributing factor was that aircraft had just come out of paint shop and the FMS had interference from paint on antennas.

Original NASA ASRS Text

Title: FLC OF A CPR JET FAILED TO MAKE A DSCNT XING ALT RESTR DUE TO A LACK OF MONITORING THE FMS MODE AND ACFT ACTUAL POS DURING DSCNT.

Narrative: ACFT WAS CLRED TO CROSS MARIT INTXN AT AND MAINTAIN 10000 FT MSL. I DID NOT REALIZE THAT FMS HAD GONE INTO DR MODE AND WE WERE 7 MI FROM XING RESTR INSTEAD OF THE 20 MI SHOWING ON THE FMS. PNF REALIZED PROB WHEN SETTING UP OUTBOUND RADIAL ON #2 NAV RECEIVER AND SAW DISTANCE TO TNV AND INTXN DID NOT ADD UP WITH FMS DISTANCE. I INCREASED RATE OF DSCNT BUT MISSED THE XING RESTR BY SEVERAL HUNDRED FT. CONTRIBUTING FACTOR WAS THAT ACFT HAD JUST COME OUT OF PAINT SHOP AND THE FMS HAD INTERFERENCE FROM PAINT ON ANTENNAS.

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.