Altitude deviation. Altitude crossing restr not met.

Attributes
ACN	294749
Time
Date	199501
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sea
State Reference	WA
Altitude	msl bound lower : 10000 msl bound upper : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pns
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Flight Phase	descent other
Route In Use	arrival star : star enroute airway : zse
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 3100 flight time type : 40
ASRS Report	294749
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Scheduled flight operating between pasco, wa, and seattle, wa, cruising altitude was FL180 using the chins 2 arrival route. ATC gave directions to cross snomy intersection at 10000 ft (35 DME sea). The autoplt was being used and descent mode was activated immediately following ATC instructions. PNF then questioned exact location of the intersection and attention was diverted by both pilots. (Emb 120 descent mode autoplt gives approximately 1800-2000 FPM.) the intersection was believed to have been crossed at approximately 11500 ft. Center was telephoned after landing.

Original NASA ASRS Text

Title: ALTDEV. ALT XING RESTR NOT MET.

Narrative: SCHEDULED FLT OPERATING BTWN PASCO, WA, AND SEATTLE, WA, CRUISING ALT WAS FL180 USING THE CHINS 2 ARR RTE. ATC GAVE DIRECTIONS TO CROSS SNOMY INTXN AT 10000 FT (35 DME SEA). THE AUTOPLT WAS BEING USED AND DSCNT MODE WAS ACTIVATED IMMEDIATELY FOLLOWING ATC INSTRUCTIONS. PNF THEN QUESTIONED EXACT LOCATION OF THE INTXN AND ATTN WAS DIVERTED BY BOTH PLTS. (EMB 120 DSCNT MODE AUTOPLT GIVES APPROX 1800-2000 FPM.) THE INTXN WAS BELIEVED TO HAVE BEEN CROSSED AT APPROX 11500 FT. CTR WAS TELEPHONED AFTER LNDG.

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.