 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
An air carrier aircraft's FMC was programmed to restrict its bank to 15 degrees when flying the phx st.john SID. An aircraft that departed after them turned with 30 degrees bank causing a traffic conflict.
| Attributes | |
| ACN | 842583 |
| Time | |
| Date | 200907 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | P50.TRACON |
| State Reference | AZ |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Route In Use | SID SJN3.SJN |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Route In Use | SID SJN3.SJN |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Conflict Airborne Conflict Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types |
Narrative:
During the st john's departure (sjn.3SJN) out of phx from runway 25R; be advised that flying the procedure with autopilot on; after the 9 DME arc; the procedure requires a turn to a 360 degree heading which the FMS commands a 15 degree bank. Another air carrier flying a B737 departed behind us and turned inside us because their FMS commands a 30 degree bank. ATC had difficulty keeping us separated and questioned us why our turn was so shallow. I informed them of our situation. The FMS should command a 30 degree bank; keeping everyone on the same page. I have flown this departure twice this month and same thing happened.
Original NASA ASRS Text
Title: An air carrier aircraft's FMC was programmed to restrict its bank to 15 degrees when flying the PHX St.John SID. An aircraft that departed after them turned with 30 degrees bank causing a traffic conflict.
Narrative: During the St John's Departure (SJN.3SJN) out of PHX from Runway 25R; be advised that flying the procedure with autopilot on; after the 9 DME arc; the procedure requires a turn to a 360 degree heading which the FMS commands a 15 degree bank. Another air carrier flying a B737 departed behind us and turned inside us because their FMS commands a 30 degree bank. ATC had difficulty keeping us separated and questioned us why our turn was so shallow. I informed them of our situation. The FMS should command a 30 degree bank; keeping everyone on the same page. I have flown this departure twice this month and same thing happened.
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.