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Flight crew's FMS programming led to air carrier aircraft's deviation from a published departure. ATC advised.
| Attributes | |
| ACN | 300335 |
| Time | |
| Date | 199503 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : sea |
| State Reference | WA |
| Altitude | msl bound lower : 400 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sea |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : initial |
| Route In Use | departure other departure sid : sid enroute airway : sea |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 14000 flight time type : 600 |
| ASRS Report | 300335 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 17000 flight time type : 225 |
| ASRS Report | 300334 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Clearance was for a mountain 3 departure from sea runway 34L, maintain 9000 ft. The departure requires tracking the sea 338 degree radial to cross sea 8 DME at or above 4000 ft then turn to 070 degree heading. CDU was programmed with a waypoint at sea 338 degrees, 8 mi and an altitude constraint at 4000 ft. At that waypoint LNAV and VNAV were selected after takeoff and autoplt engaged. The aircraft began a turn below 4000 ft to intercept a line tangent to the sea 8 DME arc, the tangent at the 338 degree radial. It climbed through 4000 ft before crossing the 8 DME arc. Departure control advised that we should have waited until 8 DME before starting the turn.
Original NASA ASRS Text
Title: FLC'S FMS PROGRAMMING LED TO ACR ACFT'S DEV FROM A PUBLISHED DEP. ATC ADVISED.
Narrative: CLRNC WAS FOR A MOUNTAIN 3 DEP FROM SEA RWY 34L, MAINTAIN 9000 FT. THE DEP REQUIRES TRACKING THE SEA 338 DEG RADIAL TO CROSS SEA 8 DME AT OR ABOVE 4000 FT THEN TURN TO 070 DEG HDG. CDU WAS PROGRAMMED WITH A WAYPOINT AT SEA 338 DEGS, 8 MI AND AN ALT CONSTRAINT AT 4000 FT. AT THAT WAYPOINT LNAV AND VNAV WERE SELECTED AFTER TKOF AND AUTOPLT ENGAGED. THE ACFT BEGAN A TURN BELOW 4000 FT TO INTERCEPT A LINE TANGENT TO THE SEA 8 DME ARC, THE TANGENT AT THE 338 DEG RADIAL. IT CLBED THROUGH 4000 FT BEFORE XING THE 8 DME ARC. DEP CTL ADVISED THAT WE SHOULD HAVE WAITED UNTIL 8 DME BEFORE STARTING THE TURN.
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.