Air carrier medium large transport track heading deviation flying a STAR into bos.

Attributes
ACN	158030
Time
Date	199009
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gdm airport : bos
State Reference	MA
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival star : star enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 8500 flight time type : 4200
ASRS Report	158030
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Was instructed to cross bronc intersection at 11000' and 250 KTS. Prior to bronc, I asked if runway 22 right or left was available since ILS DME 27 was in use. During conversation with controller regarding use of 22, he instructed us to turn left 090 degree at revere intersection. Looking down on approach plate I read 29 above the victor arwy sign which normally would indicate DME to fix. All other fixs are designated on plate are designated as such. We turned left at 29 DME off of gdm believing we were at that fix since the chart scale seemed inadequate. Also during conversation with controller who was trying to allow us to land on runway 22L or right. We believed we were correct. Shortly after, he corrected us on heading and intersection (information misinterpreted on approach legend). He indicated no problem and not to worry? Low traffic volume at that time and super visibility at bos that day no near miss. Approach executed with no problem normal operations.

Original NASA ASRS Text

Title: ACR MLG TRACK HEADING DEVIATION FLYING A STAR INTO BOS.

Narrative: WAS INSTRUCTED TO CROSS BRONC INTXN AT 11000' AND 250 KTS. PRIOR TO BRONC, I ASKED IF RWY 22 R OR L WAS AVAILABLE SINCE ILS DME 27 WAS IN USE. DURING CONVERSATION WITH CTLR REGARDING USE OF 22, HE INSTRUCTED US TO TURN L 090 DEG AT REVERE INTXN. LOOKING DOWN ON APCH PLATE I READ 29 ABOVE THE VICTOR ARWY SIGN WHICH NORMALLY WOULD INDICATE DME TO FIX. ALL OTHER FIXS ARE DESIGNATED ON PLATE ARE DESIGNATED AS SUCH. WE TURNED L AT 29 DME OFF OF GDM BELIEVING WE WERE AT THAT FIX SINCE THE CHART SCALE SEEMED INADEQUATE. ALSO DURING CONVERSATION WITH CTLR WHO WAS TRYING TO ALLOW US TO LAND ON RWY 22L OR R. WE BELIEVED WE WERE CORRECT. SHORTLY AFTER, HE CORRECTED US ON HDG AND INTXN (INFO MISINTERPRETED ON APCH LEGEND). HE INDICATED NO PROB AND NOT TO WORRY? LOW TFC VOLUME AT THAT TIME AND SUPER VISIBILITY AT BOS THAT DAY NO NEAR MISS. APCH EXECUTED WITH NO PROB NORMAL OPS.

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.