An air carrier B757 flight crew descended to their cleared altitude before crossing a navigation point with a higher restr altitude, but this point was not displayed on their FMS.

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Attributes
ACN	391280
Time
Date	199801
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dgu airport : bos
State Reference	MA
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : straight in arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	391280
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	391281
Events
Anomaly	altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : far non adherence : published procedure non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I am the first officer reporting and the PF. While on radar vectors at 4000 ft for the ILS runway 27 at bos we extended the centerline off of loner intersection. Later we were cleared to intercept the localizer and cross loner at 3000 ft. Upon intercepting localizer outside of loner intersection at 4000 ft I descended to 3000 ft. I did not realize that we were still outside of klane intersection, which has a 4000 ft restr. Mentally screwed up by referring only to the presentation on the FMS which of course did not show klane. ATC made no comment. Supplemental information from acn 391281: while at 4000 ft I reset altitude alert to 3000 ft. After intercept of localizer first officer descended to 3000 ft. I mentioned that I thought we should have stayed at 4000 ft until klane 15.5 DME. I allowed the flight to stay at 3000 ft as we were now almost to klane and felt it was safer just to remain where we were. First officer felt if klane had been displayed he would not have descended and I agree. Also I should have picked up his descent quicker.

Original NASA ASRS Text

Title: AN ACR B757 FLC DSNDED TO THEIR CLRED ALT BEFORE XING A NAV POINT WITH A HIGHER RESTR ALT, BUT THIS POINT WAS NOT DISPLAYED ON THEIR FMS.

Narrative: I AM THE FO RPTING AND THE PF. WHILE ON RADAR VECTORS AT 4000 FT FOR THE ILS RWY 27 AT BOS WE EXTENDED THE CTRLINE OFF OF LONER INTXN. LATER WE WERE CLRED TO INTERCEPT THE LOC AND CROSS LONER AT 3000 FT. UPON INTERCEPTING LOC OUTSIDE OF LONER INTXN AT 4000 FT I DSNDED TO 3000 FT. I DID NOT REALIZE THAT WE WERE STILL OUTSIDE OF KLANE INTXN, WHICH HAS A 4000 FT RESTR. MENTALLY SCREWED UP BY REFERRING ONLY TO THE PRESENTATION ON THE FMS WHICH OF COURSE DID NOT SHOW KLANE. ATC MADE NO COMMENT. SUPPLEMENTAL INFO FROM ACN 391281: WHILE AT 4000 FT I RESET ALT ALERT TO 3000 FT. AFTER INTERCEPT OF LOC FO DSNDED TO 3000 FT. I MENTIONED THAT I THOUGHT WE SHOULD HAVE STAYED AT 4000 FT UNTIL KLANE 15.5 DME. I ALLOWED THE FLT TO STAY AT 3000 FT AS WE WERE NOW ALMOST TO KLANE AND FELT IT WAS SAFER JUST TO REMAIN WHERE WE WERE. FO FELT IF KLANE HAD BEEN DISPLAYED HE WOULD NOT HAVE DSNDED AND I AGREE. ALSO I SHOULD HAVE PICKED UP HIS DSCNT QUICKER.

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.