An air carrier flight crosses their clearance point of bucko 4000 ft high when the crew misreads the...

Attributes
ACN	430430
Time
Date	199903
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : esl.vortac
State Reference	WV
Altitude	msl bound lower : 25000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc artcc : zob.artcc tower : day.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach descent : intermediate altitude
Route In Use	arrival star : jansen 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : multi engine
Experience	flight time last 90 days : 225 flight time total : 19000 flight time type : 5000
ASRS Report	430430
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 80 flight time total : 8000 flight time type : 36
ASRS Report	430413
Events
Anomaly	altitude deviation : undershoot altitude deviation : crossing restriction not met non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : mode c other controllera
Resolutory Action	controller : issued alert none taken : detected after the fact
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance Chart Or Publication
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
Chart	star : jansen

Narrative:

Misunderstood clearance to cross bucko intersection at FL250. In previous 4 weeks this clearance had not been given. Was on jansen arrival to iad and thought had been given the 'expect clearance for 25 NM out at FL250 as with previous flts. Right above this is a reference to bucko. Bucko intersection is actually 14 NM west of this point. Arrival STAR is confusing. No conflict. Was not notified by ZOB of our error. ZDC told us on radio change over. ZDC advised no conflict (made the 25 NM at FL250 crossing) and on asking advised that ZOB sometime gives FL250 at bucko. Problem arose with confusing instructions and depiction's on jansen STAR. Also, pilots 'familiarity' with route and previous descent instructions over prior weeks. Clarification of STAR to include a note that bucko will/may be given as a crossing point. Supplemental information from acn 430413: a review of the arrival chart confirmed that bucko is 39 DME from kessel VOR, not 25 DME as we had thought. The arrival chart is ambiguous as it shows an 'expect restr

Original NASA ASRS Text

Title: AN ACR FLT CROSSES THEIR CLRNC POINT OF BUCKO 4000 FT HIGH WHEN THE CREW MISREADS THE CHART.

Narrative: MISUNDERSTOOD CLRNC TO CROSS BUCKO INTXN AT FL250. IN PREVIOUS 4 WKS THIS CLRNC HAD NOT BEEN GIVEN. WAS ON JANSEN ARR TO IAD AND THOUGHT HAD BEEN GIVEN THE 'EXPECT CLRNC FOR 25 NM OUT AT FL250 AS WITH PREVIOUS FLTS. RIGHT ABOVE THIS IS A REF TO BUCKO. BUCKO INTXN IS ACTUALLY 14 NM W OF THIS POINT. ARR STAR IS CONFUSING. NO CONFLICT. WAS NOT NOTIFIED BY ZOB OF OUR ERROR. ZDC TOLD US ON RADIO CHANGE OVER. ZDC ADVISED NO CONFLICT (MADE THE 25 NM AT FL250 XING) AND ON ASKING ADVISED THAT ZOB SOMETIME GIVES FL250 AT BUCKO. PROB AROSE WITH CONFUSING INSTRUCTIONS AND DEPICTION'S ON JANSEN STAR. ALSO, PLTS 'FAMILIARITY' WITH RTE AND PREVIOUS DSCNT INSTRUCTIONS OVER PRIOR WKS. CLARIFICATION OF STAR TO INCLUDE A NOTE THAT BUCKO WILL/MAY BE GIVEN AS A XING POINT. SUPPLEMENTAL INFO FROM ACN 430413: A REVIEW OF THE ARR CHART CONFIRMED THAT BUCKO IS 39 DME FROM KESSEL VOR, NOT 25 DME AS WE HAD THOUGHT. THE ARR CHART IS AMBIGUOUS AS IT SHOWS AN 'EXPECT RESTR

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.

An air carrier flight crosses their clearance point of bucko 4000 ft high when the crew misreads the chart.