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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Altitude deviation altitude excursion. Non adherence to ATC clearance procedure. Early descent procedure from approach procedure STAR descent.
| Attributes | |
| ACN | 354169 |
| Time | |
| Date | 199611 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : olm airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 12000 msl bound upper : 16000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea tower : hpn |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 8000 flight time type : 270 |
| ASRS Report | 354169 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 240 flight time total : 18000 flight time type : 10000 |
| ASRS Report | 354088 |
| Events | |
| Anomaly | altitude deviation : crossing restriction not met altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Operating as air carrier X flight oak-sea we had received some delay vectors while on the olm arrival into sea to keep us from having to hold for metering into sea. We were then re- cleared on the olm 2 arrival to descend as published. The captain then descended to 12000 ft to cross olm VOR. This is the correct altitude for northerly operations but sea was in a southerly operation. We should have crossed at 16000 ft over olm. I had just returned to the center frequency from getting a new ATIS for sea. Before I realized it, we began a descent and we both realized after going through 14000 ft, so we just continued our descent to 12000 ft. In hindsight I should have familiarized myself with the arrival in more detail before allowing my captain to descend without backing him up. The ATIS can wait until we are both very familiar with an arrival that calls for descent as published. Supplemental information from acn 354088: I mistakenly called for 12000 ft in altitude alert as that was the number that first caught my eye. Problem arose due: captain having not been in left seat recently, many vectors and speed changes off the STAR. New terminology 'descend on the olympia arrival' led me to think it was time to leave 16000 ft (premature), very small print on STAR (in night environment) I 'saw' the wrong altitude.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION. NON ADHERENCE TO ATC CLRNC PROC. EARLY DSCNT PROC FROM APCH PROC STAR DSCNT.
Narrative: OPERATING AS ACR X FLT OAK-SEA WE HAD RECEIVED SOME DELAY VECTORS WHILE ON THE OLM ARR INTO SEA TO KEEP US FROM HAVING TO HOLD FOR METERING INTO SEA. WE WERE THEN RE- CLRED ON THE OLM 2 ARR TO DSND AS PUBLISHED. THE CAPT THEN DSNDED TO 12000 FT TO CROSS OLM VOR. THIS IS THE CORRECT ALT FOR NORTHERLY OPS BUT SEA WAS IN A SOUTHERLY OP. WE SHOULD HAVE CROSSED AT 16000 FT OVER OLM. I HAD JUST RETURNED TO THE CTR FREQ FROM GETTING A NEW ATIS FOR SEA. BEFORE I REALIZED IT, WE BEGAN A DSCNT AND WE BOTH REALIZED AFTER GOING THROUGH 14000 FT, SO WE JUST CONTINUED OUR DSCNT TO 12000 FT. IN HINDSIGHT I SHOULD HAVE FAMILIARIZED MYSELF WITH THE ARR IN MORE DETAIL BEFORE ALLOWING MY CAPT TO DSND WITHOUT BACKING HIM UP. THE ATIS CAN WAIT UNTIL WE ARE BOTH VERY FAMILIAR WITH AN ARR THAT CALLS FOR DSCNT AS PUBLISHED. SUPPLEMENTAL INFO FROM ACN 354088: I MISTAKENLY CALLED FOR 12000 FT IN ALT ALERT AS THAT WAS THE NUMBER THAT FIRST CAUGHT MY EYE. PROB AROSE DUE: CAPT HAVING NOT BEEN IN L SEAT RECENTLY, MANY VECTORS AND SPD CHANGES OFF THE STAR. NEW TERMINOLOGY 'DSND ON THE OLYMPIA ARR' LED ME TO THINK IT WAS TIME TO LEAVE 16000 FT (PREMATURE), VERY SMALL PRINT ON STAR (IN NIGHT ENVIRONMENT) I 'SAW' THE WRONG ALT.
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.