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C525 captain reported failing to meet a crossing restriction during avoidance maneuvers related to a wake turbulence encounter in trail of a B737-900 on arrival into sea.
| Attributes | |
| ACN | 1567243 |
| Time | |
| Date | 201808 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | S46.TRACON |
| State Reference | WA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citationjet (C525/C526) - CJ I / II / III / IV |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Descent |
| Route In Use | STAR GLASR1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine |
| Experience | Flight Crew Last 90 Days 80 Flight Crew Total 14500 Flight Crew Type 275 |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Altitude Undershoot Deviation - Procedural Clearance Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Failed to meet crossing restriction at woodi intersection due to wake encounter and evasive action.inbound to sea on GLASR1 STAR; cleared to 'descend via GLASR1'. We were flying a citation CJ4; ten miles in trail of a 737-900. Shortly after passing jaksn intersection; we began to encounter wake turbulence as buffeting and uncontrollable left/right rolling. I reduced our descent rate to remain above the path of the preceding 737-900. The buffeting and rolling stopped and we continued our descent; but were unable to make the 'at or below 14000 feet' crossing restriction over the woodi intersection. I believe we crossed woodi about 1000' high. We reported the wake encounter to the controller and mentioned our lack of meeting the crossing restriction. The controller said nothing to us regarding the altitude deviation. The remainder of the STAR and approach continued behind the 737-900 with occasional wake buffeting. We are experiencing wake turbulence more frequently; especially on stars and approaches. My guess would be due to the accuracy of the GPS/RNAV equipment.
Original NASA ASRS Text
Title: C525 Captain reported failing to meet a crossing restriction during avoidance maneuvers related to a wake turbulence encounter in trail of a B737-900 on arrival into SEA.
Narrative: Failed to meet crossing restriction at WOODI intersection due to wake encounter and evasive action.Inbound to SEA on GLASR1 STAR; cleared to 'descend VIA GLASR1'. We were flying a Citation CJ4; ten miles in trail of a 737-900. Shortly after passing JAKSN intersection; we began to encounter wake turbulence as buffeting and uncontrollable left/right rolling. I reduced our descent rate to remain above the path of the preceding 737-900. The buffeting and rolling stopped and we continued our descent; but were unable to make the 'at or below 14000 feet' crossing restriction over the WOODI intersection. I believe we crossed WOODI about 1000' high. We reported the wake encounter to the controller and mentioned our lack of meeting the crossing restriction. The controller said nothing to us regarding the altitude deviation. The remainder of the STAR and approach continued behind the 737-900 with occasional wake buffeting. We are experiencing wake turbulence more frequently; especially on STARs and approaches. My guess would be due to the accuracy of the GPS/RNAV equipment.
Data retrieved from NASA's ASRS site 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.