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First officer of a B737-300 reduced airspeed too soon due to misreading chart causing ARTCC controller to vector the trailing aircraft in order to maintain separation.
| Attributes | |
| ACN | 461161 |
| Time | |
| Date | 200001 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | TN |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : gmh 4. gmh |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 250 flight time total : 5000 flight time type : 750 |
| ASRS Report | 461161 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 240 flight time total : 19000 flight time type : 240 |
| ASRS Report | 461570 |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | atc equipment other atc equipment : radar |
| Resolutory Action | controller : issued alert controller : separated traffic flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While descending via the graham 4 arrival, we were instructed to maintain 310 KIAS or greater. Bhm VOR has a crossing restr of 10000 ft with an expectation of 250 KTS. I misread the chart and began slowing approximately 10 mi southwest of the VOR. ATC queried me and informed us that due to our slowing prematurely he would have to vector the aircraft behind us to maintain spacing. We immediately returned to 310 KTS as instructed. Factors involved: we had already flown 4 1/2 hours that day with multiple maintenance problems. This caused some fatigue in the cockpit which was a contributing factor. The whole incident was basically a mistake.
Original NASA ASRS Text
Title: FO OF A B737-300 REDUCED AIRSPD TOO SOON DUE TO MISREADING CHART CAUSING ARTCC CTLR TO VECTOR THE TRAILING ACFT IN ORDER TO MAINTAIN SEPARATION.
Narrative: WHILE DSNDING VIA THE GRAHAM 4 ARR, WE WERE INSTRUCTED TO MAINTAIN 310 KIAS OR GREATER. BHM VOR HAS A XING RESTR OF 10000 FT WITH AN EXPECTATION OF 250 KTS. I MISREAD THE CHART AND BEGAN SLOWING APPROX 10 MI SW OF THE VOR. ATC QUERIED ME AND INFORMED US THAT DUE TO OUR SLOWING PREMATURELY HE WOULD HAVE TO VECTOR THE ACFT BEHIND US TO MAINTAIN SPACING. WE IMMEDIATELY RETURNED TO 310 KTS AS INSTRUCTED. FACTORS INVOLVED: WE HAD ALREADY FLOWN 4 1/2 HRS THAT DAY WITH MULTIPLE MAINT PROBS. THIS CAUSED SOME FATIGUE IN THE COCKPIT WHICH WAS A CONTRIBUTING FACTOR. THE WHOLE INCIDENT WAS BASICALLY A MISTAKE.
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.