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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier X descended below assigned altitude resulting in less than standard separation with air carrier Y.
| Attributes | |
| ACN | 109493 |
| Time | |
| Date | 198904 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bih |
| State Reference | CA |
| Altitude | msl bound lower : 31000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : atp |
| Experience | controller radar : 5 flight time total : 3200 |
| ASRS Report | 109493 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : ground less severe non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 1500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X checked on frequency descending to FL330. I acknowledged his call and restated his assigned altitude, then advised him of traffic at 9 O'clock, FL310. At approximately XX29 I observed air carrier X at FL328; advised him that mode C indicated 200' low and asked him to verify altitude. Air carrier X advised me that he had missed leveling at FL330 and was climbing back up to FL330. By this time C/a had activated and air carrier X was indicating FL320 about 3 NM from air carrier Y, who was level at FL310.
Original NASA ASRS Text
Title: ACR X DESCENDED BELOW ASSIGNED ALT RESULTING IN LESS THAN STANDARD SEPARATION WITH ACR Y.
Narrative: ACR X CHKED ON FREQ DSNDING TO FL330. I ACKNOWLEDGED HIS CALL AND RESTATED HIS ASSIGNED ALT, THEN ADVISED HIM OF TFC AT 9 O'CLOCK, FL310. AT APPROX XX29 I OBSERVED ACR X AT FL328; ADVISED HIM THAT MODE C INDICATED 200' LOW AND ASKED HIM TO VERIFY ALT. ACR X ADVISED ME THAT HE HAD MISSED LEVELING AT FL330 AND WAS CLBING BACK UP TO FL330. BY THIS TIME C/A HAD ACTIVATED AND ACR X WAS INDICATING FL320 ABOUT 3 NM FROM ACR Y, WHO WAS LEVEL AT FL310.
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.