Hawker 800 flight crew does not meet a crossing restr.

Attributes
ACN	701935
Time
Date	200607
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zoa.artcc
State Reference	CA
Altitude	msl single value : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa.artcc
Operator	general aviation : corporate
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9200 flight time type : 31
ASRS Report	701935
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

We were on a flight from lax to hwd. I was the sic and the PF. We had been cleared from the gmn VOR direct to the pnx VOR. Center issued us a descent to cross 10 mi southeast of the pnx VOR at FL200. The captain; as PNF; entered the crossing restr into the FMS as I began our descent from FL280. The controller had used slightly vague language in issuing the clearance. ('Cross 10 mi this side of pnx at FL200' or 'cross 10 mi from pnx at FL200'.) I had understood this to mean 10 mi southeast of pnx. The captain I later learned had interpreted this to mean cross 10 mi northwest of pnx at FL200. This was my first trip in this aircraft and the FMS was a type I had never used before. I had no knowledge of how to operate it and had difficulty getting information from the displays. As a result when the captain entered the crossing restr; I assumed he had entered it correctly and that he had interpreted the position of the crossing restr as I had. As we passed over the crossing restr point between FL215 and FL210(between 1000 ft and 1500 ft high) the controller informed us that we had been cleared to cross 10 mi southeast of pnx at FL200 and inquired as to why we had not made the restr.

Original NASA ASRS Text

Title: HAWKER 800 FLT CREW DOES NOT MEET A XING RESTR.

Narrative: WE WERE ON A FLT FROM LAX TO HWD. I WAS THE SIC AND THE PF. WE HAD BEEN CLRED FROM THE GMN VOR DIRECT TO THE PNX VOR. CTR ISSUED US A DSCNT TO CROSS 10 MI SE OF THE PNX VOR AT FL200. THE CAPT; AS PNF; ENTERED THE XING RESTR INTO THE FMS AS I BEGAN OUR DSCNT FROM FL280. THE CTLR HAD USED SLIGHTLY VAGUE LANGUAGE IN ISSUING THE CLRNC. ('CROSS 10 MI THIS SIDE OF PNX AT FL200' OR 'CROSS 10 MI FROM PNX AT FL200'.) I HAD UNDERSTOOD THIS TO MEAN 10 MI SE OF PNX. THE CAPT I LATER LEARNED HAD INTERPED THIS TO MEAN CROSS 10 MI NW OF PNX AT FL200. THIS WAS MY FIRST TRIP IN THIS ACFT AND THE FMS WAS A TYPE I HAD NEVER USED BEFORE. I HAD NO KNOWLEDGE OF HOW TO OPERATE IT AND HAD DIFFICULTY GETTING INFO FROM THE DISPLAYS. AS A RESULT WHEN THE CAPT ENTERED THE XING RESTR; I ASSUMED HE HAD ENTERED IT CORRECTLY AND THAT HE HAD INTERPED THE POS OF THE XING RESTR AS I HAD. AS WE PASSED OVER THE XING RESTR POINT BTWN FL215 AND FL210(BTWN 1000 FT AND 1500 FT HIGH) THE CTLR INFORMED US THAT WE HAD BEEN CLRED TO CROSS 10 MI SE OF PNX AT FL200 AND INQUIRED AS TO WHY WE HAD NOT MADE THE RESTR.

Data retrieved from NASA's ASRS site as of January 2009 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.