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A B737-300 flight crew is queried by approach controller as to the altitude assigned when approach notes a leveloff at 8000 ft versus an alleged clearance to 9000 ft during the arlin 3 arrival into phx, az.
| Attributes | |
| ACN | 563663 |
| Time | |
| Date | 200210 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : payne |
| State Reference | AZ |
| Altitude | msl bound lower : 8000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : arlin |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : p50.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 17000 flight time type : 10000 |
| ASRS Report | 563663 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial |
| Experience | flight time last 90 days : 210 flight time total : 8000 flight time type : 2000 |
| ASRS Report | 563664 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : reviewed incident with flight crew other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airspace Structure ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Inbound to phx on arlin arrival, captain flying, first officer on radios. Checked in on approach 126.8 at 11000 ft/250 KTS at paynt. I then left frequency to secure the cabin for arrival. Returned and first officer stated and I acknowledged clearance to 8000 ft and we began descent. The clouds looked like they might be bumpy, so I left frequency again to call the cabin and advise them of a possible bump, and to be cautious. On return, ATC said 'company number, I thought I gave you 9000 ft,' to which the first officer replied, 'no sir, you gave us 8 and we read back 8.' ATC then advised us of traffic at 7000 ft departing phx, and nothing else was said of his altitude query. We assumed that he intended to assign us 9000 ft as usual, but instead gave us 8000 ft, which created no conflict for anyone on the arrival. Nothing more was said, and we landed uneventfully. Supplemental information from acn 563664: after several mins at 8000 ft, ATC asked if he cleared us to 9000 ft instead of 8000 ft. I told ATC that I heard 8000 ft and read back 8000 ft.
Original NASA ASRS Text
Title: A B737-300 FLC IS QUERIED BY APCH CTLR AS TO THE ALT ASSIGNED WHEN APCH NOTES A LEVELOFF AT 8000 FT VERSUS AN ALLEGED CLRNC TO 9000 FT DURING THE ARLIN 3 ARR INTO PHX, AZ.
Narrative: INBOUND TO PHX ON ARLIN ARR, CAPT FLYING, FO ON RADIOS. CHKED IN ON APCH 126.8 AT 11000 FT/250 KTS AT PAYNT. I THEN LEFT FREQ TO SECURE THE CABIN FOR ARR. RETURNED AND FO STATED AND I ACKNOWLEDGED CLRNC TO 8000 FT AND WE BEGAN DSCNT. THE CLOUDS LOOKED LIKE THEY MIGHT BE BUMPY, SO I LEFT FREQ AGAIN TO CALL THE CABIN AND ADVISE THEM OF A POSSIBLE BUMP, AND TO BE CAUTIOUS. ON RETURN, ATC SAID 'COMPANY NUMBER, I THOUGHT I GAVE YOU 9000 FT,' TO WHICH THE FO REPLIED, 'NO SIR, YOU GAVE US 8 AND WE READ BACK 8.' ATC THEN ADVISED US OF TFC AT 7000 FT DEPARTING PHX, AND NOTHING ELSE WAS SAID OF HIS ALT QUERY. WE ASSUMED THAT HE INTENDED TO ASSIGN US 9000 FT AS USUAL, BUT INSTEAD GAVE US 8000 FT, WHICH CREATED NO CONFLICT FOR ANYONE ON THE ARR. NOTHING MORE WAS SAID, AND WE LANDED UNEVENTFULLY. SUPPLEMENTAL INFO FROM ACN 563664: AFTER SEVERAL MINS AT 8000 FT, ATC ASKED IF HE CLRED US TO 9000 FT INSTEAD OF 8000 FT. I TOLD ATC THAT I HEARD 8000 FT AND READ BACK 8000 FT.
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.