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Medium large transport air carrier flight crew challenged by approach controller when assigned speed to OM is observed slowing. Flight crew challenge clearance, but increase to reassigned speed. Passing OM, flight crew reduce speed for landing confign. Flight crew cites contributing factors as frequency volume congestion, numerous vectors and speed assignments.
| Attributes | |
| ACN | 397310 |
| Time | |
| Date | 199803 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 1800 msl bound upper : 1800 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 210 flight time total : 18000 flight time type : 460 |
| ASRS Report | 397310 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument |
| Experience | flight time last 90 days : 230 flight time total : 13000 flight time type : 1500 |
| ASRS Report | 397446 |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Held during arrival into bos. Exited hold with multiple vectors and airspeed changes. Approach control frequency very busy with multiple xmissions to aircraft. Approach control mistakenly vectored our flight through the localizer and then vectored us back to re- intercept localizer, last instruction as understood by captain and first officer was to slow to 170 KTS cleared for the approach. Approaching the OM and GS intercept (4.7 NM from runway 4R) started to slow aircraft and configure for landing (140 KTS) approach control called us to increase our speed immediately to 190 KTS or state our intentions. As soon as we reached 190 KTS, the controller again cleared us for the approach and to contact tower. Immediately slowed to approach speed and completed landing. Miscom between approach control and our aircraft occurred. Either approach control told us to maintain 170 KTS to the OM or he neglected to add that to his transmission. Both pilots confirmed that we were cleared for the approach and that we had not heard to maintain 170 KTS to the OM. In any event, using normal procedures requires us to slow and configure the aircraft approaching the marker on GS. With multiple xmissions during the approach it is almost impossible to get clarification if a misunderstanding occurs. Suggest a slower flow to airport.
Original NASA ASRS Text
Title: MLG ACR FLC CHALLENGED BY APCH CTLR WHEN ASSIGNED SPD TO OM IS OBSERVED SLOWING. FLC CHALLENGE CLRNC, BUT INCREASE TO REASSIGNED SPD. PASSING OM, FLC REDUCE SPD FOR LNDG CONFIGN. FLC CITES CONTRIBUTING FACTORS AS FREQ VOLUME CONGESTION, NUMEROUS VECTORS AND SPD ASSIGNMENTS.
Narrative: HELD DURING ARR INTO BOS. EXITED HOLD WITH MULTIPLE VECTORS AND AIRSPD CHANGES. APCH CTL FREQ VERY BUSY WITH MULTIPLE XMISSIONS TO ACFT. APCH CTL MISTAKENLY VECTORED OUR FLT THROUGH THE LOC AND THEN VECTORED US BACK TO RE- INTERCEPT LOC, LAST INSTRUCTION AS UNDERSTOOD BY CAPT AND FO WAS TO SLOW TO 170 KTS CLRED FOR THE APCH. APCHING THE OM AND GS INTERCEPT (4.7 NM FROM RWY 4R) STARTED TO SLOW ACFT AND CONFIGURE FOR LNDG (140 KTS) APCH CTL CALLED US TO INCREASE OUR SPD IMMEDIATELY TO 190 KTS OR STATE OUR INTENTIONS. AS SOON AS WE REACHED 190 KTS, THE CTLR AGAIN CLRED US FOR THE APCH AND TO CONTACT TWR. IMMEDIATELY SLOWED TO APCH SPD AND COMPLETED LNDG. MISCOM BTWN APCH CTL AND OUR ACFT OCCURRED. EITHER APCH CTL TOLD US TO MAINTAIN 170 KTS TO THE OM OR HE NEGLECTED TO ADD THAT TO HIS XMISSION. BOTH PLTS CONFIRMED THAT WE WERE CLRED FOR THE APCH AND THAT WE HAD NOT HEARD TO MAINTAIN 170 KTS TO THE OM. IN ANY EVENT, USING NORMAL PROCS REQUIRES US TO SLOW AND CONFIGURE THE ACFT APCHING THE MARKER ON GS. WITH MULTIPLE XMISSIONS DURING THE APCH IT IS ALMOST IMPOSSIBLE TO GET CLARIFICATION IF A MISUNDERSTANDING OCCURS. SUGGEST A SLOWER FLOW TO ARPT.
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.