November 22, 201015 yr Had a strange situation yesterday: During a test flight around KPSP, CRZ ALT was 9000, I flew her to 9000 by hand (NAV and PROF engaged, A/T engaged), levelled off and engaged the A/P with AUTOFLIGHT. For no apparent reason, the automatics initiated a 3000+ fpm descent. I switched the A/P off, arrested the descent, started a manual climb, pulled the ALT knob and engaged AUTOFLIGHT again. This time, a perfect CLB to CRZ ALT was performed. When level, I hit PROF. The altitude window of the FMA showed HOLD 9000 (in magenta? Can't remember, but guess so since A/P was on).What indicated at this point whether PROF was active? I for my part wasn't sure (Boeings show VNAV at least :()... Andreas, LOWW - Nihil sumus et fuimus mortales. Respice, lector: In nihil ab nihilo quam cito recidimus.
November 22, 201015 yr The FMA annuciation guide in the manual is very extensive, you'll find your answer there.Did you arm AUTOFLIGHT before takeoff per the checklist? Dan Downs KCRP
November 23, 201015 yr Author Think I got it: It was magenta, so it was FMS controlled. Thank you anyway. Andreas, LOWW - Nihil sumus et fuimus mortales. Respice, lector: In nihil ab nihilo quam cito recidimus.
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