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A B757 flying a demanding SID had a track deviation after the ap pitched up when engaged requiring attention to the rapidly decreasing speed and not the track.
| Attributes | |
| ACN | 783228 |
| Time | |
| Date | 200804 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | msl single value : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Route In Use | departure sid : n/s |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time total : 8500 flight time type : 944 |
| ASRS Report | 783228 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 90 flight time total : 17000 flight time type : 2000 |
| ASRS Report | 783229 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance other anomaly other spatial deviation |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem flight crew : returned to original clearance flight crew : regained aircraft control |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Possible navigation track deviation. On takeoff; selected LNAV on MCP (confirmed on ADI FMA); first officer was PF; continued to hand fly the aircraft as per the pratt & whitney procedures on commercial chart 1 for ZZZZ departures. At 1500 ft AGL VNAV was selected on MCP (confirmed on ADI FMA). Shortly after autoplt was engaged; the autoplt began a steady pitch up to well above the flight director pitch command causing a rapid decrease to near V2. Autoplt was disconnected; a proper pitch attitude was established and the departure was continued. In the course of the pitch-up distraction; autoplt disconnect and re-establishment of proper pitch attitude; we overshot our first turn on the departure -- by how much I don't know. We re-established ourselves on the proper track as quickly as possible and continued the departure with no comments or complaints from departure control.
Original NASA ASRS Text
Title: A B757 FLYING A DEMANDING SID HAD A TRACK DEV AFTER THE AP PITCHED UP WHEN ENGAGED REQUIRING ATTENTION TO THE RAPIDLY DECREASING SPD AND NOT THE TRACK.
Narrative: POSSIBLE NAV TRACK DEV. ON TKOF; SELECTED LNAV ON MCP (CONFIRMED ON ADI FMA); FO WAS PF; CONTINUED TO HAND FLY THE ACFT AS PER THE PRATT & WHITNEY PROCS ON COMMERCIAL CHART 1 FOR ZZZZ DEPS. AT 1500 FT AGL VNAV WAS SELECTED ON MCP (CONFIRMED ON ADI FMA). SHORTLY AFTER AUTOPLT WAS ENGAGED; THE AUTOPLT BEGAN A STEADY PITCH UP TO WELL ABOVE THE FLT DIRECTOR PITCH COMMAND CAUSING A RAPID DECREASE TO NEAR V2. AUTOPLT WAS DISCONNECTED; A PROPER PITCH ATTITUDE WAS ESTABLISHED AND THE DEP WAS CONTINUED. IN THE COURSE OF THE PITCH-UP DISTR; AUTOPLT DISCONNECT AND RE-ESTABLISHMENT OF PROPER PITCH ATTITUDE; WE OVERSHOT OUR FIRST TURN ON THE DEP -- BY HOW MUCH I DON'T KNOW. WE RE-ESTABLISHED OURSELVES ON THE PROPER TRACK AS QUICKLY AS POSSIBLE AND CONTINUED THE DEP WITH NO COMMENTS OR COMPLAINTS FROM DEP CTL.
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.