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Air carrier did not comply with speed restriction and caused flow control problems with 4 succeeding aircraft.
| Attributes | |
| ACN | 120899 |
| Time | |
| Date | 198908 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival : profile descent |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 20 |
| ASRS Report | 120899 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : clearance other anomaly |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X inbound to los angeles was descending on the civet profile assigned 320 KTS. He was the first of a string of 5 aircraft. Even though assigned 320 KTS by ATC he elected to reduce his airspeed without advising the controller. When I observed the ground speed reducing, I asked pilot to verify doing 320 KTS and he advised he was slowing. This resulted in los angeles approach having to accept handoffs on the next 2 aircraft with less than the established flow control spacing and the last 2 aircraft in the string had to have the profile descent cancelled and were vectored off the localizer for spacing, then back onto the localizer. Had air carrier X complied with his speed assignment this would not have been necessary.
Original NASA ASRS Text
Title: ACR DID NOT COMPLY WITH SPEED RESTRICTION AND CAUSED FLOW CTL PROBLEMS WITH 4 SUCCEEDING ACFT.
Narrative: ACR X INBND TO LOS ANGELES WAS DESCENDING ON THE CIVET PROFILE ASSIGNED 320 KTS. HE WAS THE FIRST OF A STRING OF 5 ACFT. EVEN THOUGH ASSIGNED 320 KTS BY ATC HE ELECTED TO REDUCE HIS AIRSPEED WITHOUT ADVISING THE CTLR. WHEN I OBSERVED THE GND SPEED REDUCING, I ASKED PLT TO VERIFY DOING 320 KTS AND HE ADVISED HE WAS SLOWING. THIS RESULTED IN LOS ANGELES APCH HAVING TO ACCEPT HANDOFFS ON THE NEXT 2 ACFT WITH LESS THAN THE ESTABLISHED FLOW CTL SPACING AND THE LAST 2 ACFT IN THE STRING HAD TO HAVE THE PROFILE DSCNT CANCELLED AND WERE VECTORED OFF THE LOC FOR SPACING, THEN BACK ONTO THE LOC. HAD ACR X COMPLIED WITH HIS SPEED ASSIGNMENT THIS WOULD NOT HAVE BEEN NECESSARY.
Data retrieved from NASA's ASRS site as of August 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.