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Flight crew of air carrier medium large transport aircraft deviated from assigned altitude and complying with a descent crossing restriction in responding to a TCASII RA.
| Attributes | |
| ACN | 235370 |
| Time | |
| Date | 199303 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hdf |
| State Reference | CA |
| Altitude | msl bound lower : 8000 msl bound upper : 10500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : ont |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 235370 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : crossing restriction not met non adherence : clearance other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was direct kayoh intersection for sna. I advised air carrier X of traffic, 10 O'clock, 3 mi, northbound, altitude indicating 9200 ft MSL. Air carrier X was at 10000 ft, and I had just instructed him to cross kayoh at 8000 ft, at 210 KTS. Within 10 seconds of issuing air carrier X the traffic, I advised him that traffic was no factor, as it would pass well clear behind his position. Upon receiving that advisory, air carrier X initiated a climbing RA. The terrifying part is when a new, upcoming TCASII will issue lateral avoidance commands!
Original NASA ASRS Text
Title: FLC OF ACR MLG ACFT DEVIATED FROM ASSIGNED ALT AND COMPLYING WITH A DSCNT XING RESTRICTION IN RESPONDING TO A TCASII RA.
Narrative: ACR X WAS DIRECT KAYOH INTXN FOR SNA. I ADVISED ACR X OF TFC, 10 O'CLOCK, 3 MI, NBOUND, ALT INDICATING 9200 FT MSL. ACR X WAS AT 10000 FT, AND I HAD JUST INSTRUCTED HIM TO CROSS KAYOH AT 8000 FT, AT 210 KTS. WITHIN 10 SECONDS OF ISSUING ACR X THE TFC, I ADVISED HIM THAT TFC WAS NO FACTOR, AS IT WOULD PASS WELL CLR BEHIND HIS POS. UPON RECEIVING THAT ADVISORY, ACR X INITIATED A CLBING RA. THE TERRIFYING PART IS WHEN A NEW, UPCOMING TCASII WILL ISSUE LATERAL AVOIDANCE COMMANDS!
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.