The flight crew missed their assigned crossing restr by 1100 ft. The flight crew did not anticipate turbulence when they programmed their FMC. There was turbulence and the speed had to be reduced which resulted in a less steep descent angle.

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Attributes
ACN	327520
Time
Date	199602
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : har
State Reference	PA
Altitude	msl bound lower : 25000 msl bound upper : 26100
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	general aviation : corporate
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 14000 flight time type : 200
ASRS Report	327520
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Clearance to descend to cross 40 NM west of har VOR at/maintain FL250. Programmed FMS, initiated descent. Turbulence increased to moderate as aircraft was descending near maximum airspeed, switched from 'flight crew' mode to 'vs' mode and reduced power for continuing descent which slowed vertical descent rate considerably. Got too close and too high for crossing restr but still tried to make it with power off and autoplt off. Missed restr by 1100 ft.

Original NASA ASRS Text

Title: THE FLC MISSED THEIR ASSIGNED XING RESTR BY 1100 FT. THE FLC DID NOT ANTICIPATE TURB WHEN THEY PROGRAMMED THEIR FMC. THERE WAS TURB AND THE SPD HAD TO BE REDUCED WHICH RESULTED IN A LESS STEEP DSCNT ANGLE.

Narrative: CLRNC TO DSND TO CROSS 40 NM W OF HAR VOR AT/MAINTAIN FL250. PROGRAMMED FMS, INITIATED DSCNT. TURB INCREASED TO MODERATE AS ACFT WAS DSNDING NEAR MAX AIRSPD, SWITCHED FROM 'FLC' MODE TO 'VS' MODE AND REDUCED PWR FOR CONTINUING DSCNT WHICH SLOWED VERT DSCNT RATE CONSIDERABLY. GOT TOO CLOSE AND TOO HIGH FOR XING RESTR BUT STILL TRIED TO MAKE IT WITH PWR OFF AND AUTOPLT OFF. MISSED RESTR BY 1100 FT.

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.