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A B757 crew reports an abrupt pitch up on a false glide slope while acquiring the sea runway 16R ILS at 6000 ft. The crosswinds were strong.
| Attributes | |
| ACN | 813124 |
| Time | |
| Date | 200811 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 240 flight time total : 14500 flight time type : 450 |
| ASRS Report | 813124 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 800 |
| ASRS Report | 813123 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : ehsi other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Navigational Facility Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
At 6000 ft given 130 degree heading to join runway 16R from the west. Strong crosswind from approximately 45 degrees from the right at 54 KTS. Autopilot captured localizer and I armed the approach mode. Glideslope was alive and at approximately 1 DOT the autoplt made a false GS capture and aircraft began an abrupt climb with autothrottle adding power. At approximately 6300 ft I disconnected autopilot and hand flew back to 6000 ft and continued approach by hand. No conflict with traffic known; however this could be a safety issue on a close parallel approach.
Original NASA ASRS Text
Title: A B757 CREW REPORTS AN ABRUPT PITCH UP ON A FALSE GLIDE SLOPE WHILE ACQUIRING THE SEA RWY 16R ILS AT 6000 FT. THE CROSSWINDS WERE STRONG.
Narrative: AT 6000 FT GIVEN 130 DEG HEADING TO JOIN RWY 16R FROM THE WEST. STRONG CROSSWIND FROM APPROX 45 DEGS FROM THE RIGHT AT 54 KTS. AUTOPILOT CAPTURED LOC AND I ARMED THE APPROACH MODE. GLIDESLOPE WAS ALIVE AND AT APPROX 1 DOT THE AUTOPLT MADE A FALSE GS CAPTURE AND AIRCRAFT BEGAN AN ABRUPT CLIMB WITH AUTOTHROTTLE ADDING POWER. AT APPROX 6300 FT I DISCONNECTED AUTOPILOT AND HAND FLEW BACK TO 6000 FT AND CONTINUED APPROACH BY HAND. NO CONFLICT WITH TRAFFIC KNOWN; HOWEVER THIS COULD BE A SAFETY ISSUE ON A CLOSE PARALLEL APPROACH.
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.