Descent below the crossing restr at ott VOR after a change in arrival procedure at bwi.

Attributes
ACN	741169
Time
Date	200705
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : bwi.airport
State Reference	MD
Altitude	msl single value : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	arrival star : ravnn
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	741169
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	FAA Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Washington center changed our arrival into bwi from the OTT3 to the RAVNN1. After passing sabbi intersection at 15000 ft; potomac approach cleared us to descend via the RAVNN1 arrival. Both captain and myself agreed that the only other restr on the arrival was ravnn at 6000 ft. We even commented that this was a straight forward arrival when coming in over ric. Shortly thereafter potomac approach informed us we were below the 9000 ft restr at ott VOR. We rechked the chart and for a few seconds still did not see the 9000 ft ott restr. ATC informed us there was no conflict and the flight continued normally to bwi. Observations: 1) bad luck or coincidence that we both missed the published restr. 2) all other published altitude restrs on the ravnn arrival except the csn crossing are published below the intersection name. We both looked but did not see the ott restr perhaps because of the opposite orientation of the restr to the VOR name. Yet this appears to be a common commercial chart orientation for VOR crossing restrs. 3) I had flown close to 27 hours in the last 6 days.

Original NASA ASRS Text

Title: DSCNT BELOW THE CROSSING RESTR AT OTT VOR AFTER A CHANGE IN ARR PROC AT BWI.

Narrative: WASHINGTON CTR CHANGED OUR ARR INTO BWI FROM THE OTT3 TO THE RAVNN1. AFTER PASSING SABBI INTXN AT 15000 FT; POTOMAC APCH CLRED US TO DSND VIA THE RAVNN1 ARR. BOTH CAPT AND MYSELF AGREED THAT THE ONLY OTHER RESTR ON THE ARR WAS RAVNN AT 6000 FT. WE EVEN COMMENTED THAT THIS WAS A STRAIGHT FORWARD ARR WHEN COMING IN OVER RIC. SHORTLY THEREAFTER POTOMAC APCH INFORMED US WE WERE BELOW THE 9000 FT RESTR AT OTT VOR. WE RECHKED THE CHART AND FOR A FEW SECONDS STILL DID NOT SEE THE 9000 FT OTT RESTR. ATC INFORMED US THERE WAS NO CONFLICT AND THE FLT CONTINUED NORMALLY TO BWI. OBSERVATIONS: 1) BAD LUCK OR COINCIDENCE THAT WE BOTH MISSED THE PUBLISHED RESTR. 2) ALL OTHER PUBLISHED ALT RESTRS ON THE RAVNN ARR EXCEPT THE CSN CROSSING ARE PUBLISHED BELOW THE INTXN NAME. WE BOTH LOOKED BUT DID NOT SEE THE OTT RESTR PERHAPS BECAUSE OF THE OPPOSITE ORIENTATION OF THE RESTR TO THE VOR NAME. YET THIS APPEARS TO BE A COMMON COMMERCIAL CHART ORIENTATION FOR VOR CROSSING RESTRS. 3) I HAD FLOWN CLOSE TO 27 HOURS IN THE LAST 6 DAYS.

Data retrieved from NASA's ASRS site as of January 2009 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.