B737 crew descended below the charted altitude listed on the dylin 2 STAR into ewr.

Attributes
ACN	571766
Time
Date	200301
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : dqo.vortac
State Reference	DE
Altitude	msl bound lower : 16000 msl bound upper : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : dylin
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17000 flight time type : 300
ASRS Report	571766
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : far non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : radar other controllera
Resolutory Action	controller : issued new clearance
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While descending into ewr on the dylin 2 arrival, level at FL270, ATC cleared us to descend via the dylin 2, which required few steps dscnts. I overlooked the dupont VOR altitude restr of FL220 and started a descent to 13000 ft, stefe restr. My first officer agreed. We both did not notice the dupont restr. Approximately 8 mi west of dqo, ATC asked for our altitude, which was 16000 ft, and then told us that we should have leveled off at FL220 over dqo. ATC instructed to level at 15000 ft, and after passing dqo, to continue descent. End of event. The dqo restr was written under the VOR dqo box, and not like the rest of the restrs, a standalone note. On the day after the event, we received a commercial update, which included an update 10-2 to the ewr dylin 2 arrival which has the altitude restr now depicted as a standalone note, like all the rest of the restrs.

Original NASA ASRS Text

Title: B737 CREW DSNDED BELOW THE CHARTED ALT LISTED ON THE DYLIN 2 STAR INTO EWR.

Narrative: WHILE DSNDING INTO EWR ON THE DYLIN 2 ARR, LEVEL AT FL270, ATC CLRED US TO DSND VIA THE DYLIN 2, WHICH REQUIRED FEW STEPS DSCNTS. I OVERLOOKED THE DUPONT VOR ALT RESTR OF FL220 AND STARTED A DSCNT TO 13000 FT, STEFE RESTR. MY FO AGREED. WE BOTH DID NOT NOTICE THE DUPONT RESTR. APPROX 8 MI W OF DQO, ATC ASKED FOR OUR ALT, WHICH WAS 16000 FT, AND THEN TOLD US THAT WE SHOULD HAVE LEVELED OFF AT FL220 OVER DQO. ATC INSTRUCTED TO LEVEL AT 15000 FT, AND AFTER PASSING DQO, TO CONTINUE DSCNT. END OF EVENT. THE DQO RESTR WAS WRITTEN UNDER THE VOR DQO BOX, AND NOT LIKE THE REST OF THE RESTRS, A STANDALONE NOTE. ON THE DAY AFTER THE EVENT, WE RECEIVED A COMMERCIAL UPDATE, WHICH INCLUDED AN UPDATE 10-2 TO THE EWR DYLIN 2 ARR WHICH HAS THE ALT RESTR NOW DEPICTED AS A STANDALONE NOTE, LIKE ALL THE REST OF THE RESTRS.

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.