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ZLA controller described a loss of separation event with aircraft using the Q4 routing; the reporter noted the seldom used Q4 routing should be removed as an operational procedure.
| Attributes | |
| ACN | 948415 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZLA.ARTCC |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | Regional Jet CL65 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR ARLIN4 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy |
Narrative:
A crj was routed Q4.boile to kbfl level flight at FL380. A B737 routed ...trm. Blh.ARLIN4.kphx at FL410. I issued the B737 cross scole at FL250 as required by abq/ZLA letter of agreement. This action placed the B737 in conflict with the crj. I became aware or the conflict and was delayed in resolving the conflict because of a lengthy pilot read back. Recommendation; Q4 routing is rarely used. The Q4 routing creates a conflict with aircraft over blh. The standard routing is J212 decas.pmd. This routing moves the routing north of blh resolving conflicts with east bound traffic over blh. Q4 should be removed from use as it is hardly used.
Original NASA ASRS Text
Title: ZLA Controller described a loss of separation event with aircraft using the Q4 routing; the reporter noted the seldom used Q4 routing should be removed as an operational procedure.
Narrative: A CRJ was routed Q4.Boile to KBFL level flight at FL380. A B737 routed ...TRM. BLH.ARLIN4.KPHX at FL410. I issued the B737 cross SCOLE at FL250 as required by ABQ/ZLA Letter of Agreement. This action placed the B737 in conflict with the CRJ. I became aware or the conflict and was delayed in resolving the conflict because of a lengthy pilot read back. Recommendation; Q4 routing is rarely used. The Q4 routing creates a conflict with aircraft over BLH. The standard routing is J212 DECAS.PMD. This routing moves the routing north of BLH resolving conflicts with east bound traffic over BLH. Q4 should be removed from use as it is hardly used.
Data retrieved from NASA's ASRS site as of April 2012 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.