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An air carrier pilot reports excessive glide slope fluctuations at 700 ft while flying a coupled ILS to sea runway 16L.
| Attributes | |
| ACN | 815361 |
| Time | |
| Date | 200812 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 700 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : sea.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 16l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 50 flight time type : 8000 |
| ASRS Report | 815361 |
| Events | |
| Anomaly | non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Airport Navigational Facility ATC Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
On approach to sea runway 16 left with autopilot engaged at approximately 700 ft AGL aircraft nosed down abruptly. Had to disconnect autopilot to regain control due to glide slope excursion. WX was 3000 ft overcast. Protect glide slope critical areas.
Original NASA ASRS Text
Title: AN AIR CARRIER PILOT REPORTS EXCESSIVE GLIDE SLOPE FLUCTUATIONS AT 700 FT WHILE FLYING A COUPLED ILS TO SEA RUNWAY 16L.
Narrative: ON APPROACH TO SEA RWY 16 LEFT WITH AUTOPILOT ENGAGED AT APPROX 700 FT AGL AIRCRAFT NOSED DOWN ABRUPTLY. HAD TO DISCONNECT AUTOPILOT TO REGAIN CONTROL DUE TO GLIDE SLOPE EXCURSION. WX WAS 3000 FT OVERCAST. PROTECT GLIDE SLOPE CRITICAL AREAS.
Data retrieved from NASA's ASRS site as of May 2009 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.