Flight crew of an air carrier mdt jet undershot crossing altitude during descent due to crossing traffic below them interrupting their rate of descent.

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Attributes
ACN	448500
Time
Date	199909
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : mad.vor
State Reference	CT
Altitude	msl bound lower : 11000 msl bound upper : 11800
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zbw.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zbw.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : cfi pilot : atp pilot : instrument technician : airframe technician : powerplant
Experience	flight time last 90 days : 160 flight time total : 8000 flight time type : 1000
ASRS Report	448500
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument pilot : cfi
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : undershoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : issued advisory controller : issued alert none taken : anomaly accepted
Miss Distance	horizontal : 1000 vertical : 1000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Were operating as flight from rdu-bdl. Were given clearance to cross madison VOR at 11000 ft MSL, then was notified by ZBW to watch for crossing traffic (left to right) and below our altitude while descending to comply with our 11000 ft MSL crossing restr at/over mad. Both pilots were looking outside, as is customary, fundamental, paramount, and standard, while conscientiously monitoring our TCASII screen, which gave us a brief alert of the crossing traffic at our lower altitude. Due to timing of crossing traffic as reported by ZBW, we were unable to meet the restr over mad VORTAC. ATC informed us that 'for information purposes, we were 'a little long' (high) at/over mad.' therefore, I am now submitting this report to NASA to protect my license and career.

Original NASA ASRS Text

Title: FLC OF AN ACR MDT JET UNDERSHOT XING ALT DURING DSCNT DUE TO XING TFC BELOW THEM INTERRUPTING THEIR RATE OF DSCNT.

Narrative: WERE OPERATING AS FLT FROM RDU-BDL. WERE GIVEN CLRNC TO CROSS MADISON VOR AT 11000 FT MSL, THEN WAS NOTIFIED BY ZBW TO WATCH FOR XING TFC (L TO R) AND BELOW OUR ALT WHILE DSNDING TO COMPLY WITH OUR 11000 FT MSL XING RESTR AT/OVER MAD. BOTH PLTS WERE LOOKING OUTSIDE, AS IS CUSTOMARY, FUNDAMENTAL, PARAMOUNT, AND STANDARD, WHILE CONSCIENTIOUSLY MONITORING OUR TCASII SCREEN, WHICH GAVE US A BRIEF ALERT OF THE XING TFC AT OUR LOWER ALT. DUE TO TIMING OF XING TFC AS RPTED BY ZBW, WE WERE UNABLE TO MEET THE RESTR OVER MAD VORTAC. ATC INFORMED US THAT 'FOR INFO PURPOSES, WE WERE 'A LITTLE LONG' (HIGH) AT/OVER MAD.' THEREFORE, I AM NOW SUBMITTING THIS RPT TO NASA TO PROTECT MY LICENSE AND CAREER.

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.