On Sat, 1 Jun 2002 07:46:08 -0000, "Thomas Holland" <[EMAIL PROTECTED]> wrote in message <008901c20940$64b95660$fe78a8c0@private>:
> Arnt Karlsen" <[EMAIL PROTECTED]> wrote: > > "Thomas Holland" <[EMAIL PROTECTED]> wrote in message > > > TO = Takeoff and GA = Go Around thrust. > > > GA thrust is the maximum thrust the engine can deliver for a > > > limited time (5 or 10 minutes, depending on engine type and > > > certification). Can only be selected in flight. > > > > > > ..say for power plant failure immediately after takeoff, you then > > use the GA power setting, or can you go beyond this power setting, > > (breaking some safety seal, wire or whatever) sacrificeing the > > remaining engine(s), to save the aircraft in an emergency? > > No. > > Well, you could switch off the engine limiter, but you don't want to > sacrifice your remaining engine in such a situation. > All takeoff are precalculated in such a way, that GA thrust on the > remaining engine will get you to a safe altitude. ..agreed, however automated power management assumes correctly working instrumentation. One delayed B737? took off Dulles? in D.C. with about a quarter inch of slush on the wings, climbed out of ground effect and essentially mushed into the Potomac River at about 2/3 power, AFAIR the NTSB report. Believed to have been some frozen shut pressure sensors, a military "screw the numbers, firewall'em!" style approach may have toasted the engines, but would have kept the plane climbing into a more viable scenario. > Even GA thrust is guaranteed for only 5 to 10 minutes, overboosting > could reduce your engine lifetime to minutes or even seconds, > something thats not good when your life depends on this one engine. > :-) ..well, that met the requirement for Dick Rutans 105'th* trip over North Vietnam: Watching the needle _move_ after taking a main tank hit, the PIC lit the after burner and left it there, then turned the F-105 towards the Gulf of Tonkin and hugged the leaves at Mach plus some. ..the lit power plant survived the few minutes fuel supply just fine, and they had built enough speed to bleed off to make it a mile or so offshore to eject and get picked up by the right guys. Fuel and service life management at work. ;-) * Visely disbelieving his luck reputation: 105'th and final trip. ;-) Yeah, Burts brother, Dick and Jeanna Yeager? flew the Voyager nonstop for 9 days around the planet some 10? years ago. -- ..med vennlig hilsen = with Kind Regards from Arnt... ;-) ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
