Exnonrev From United States of America, joined Oct 1999, 621 posts, RR: 4 Reply 3, posted (13 years 10 months 4 weeks 1 day 13 hours ago) and read 2101 times:
The 707 only has hydraulic boost on the rudder. All other control surfaces are manual. The KC-135 didn't even have it on the rudder until midway through its production run. At that point Boeing installed the powered rudder and slightly taller vertical fin from the 707. Existing -135s were retrofitted.
If you look at old pictures of -135s, the manual rudder a/c are the ones with the slightly rounded vertical fin cap, just behind the "stinger" HF antenna.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 6, posted (13 years 10 months 4 weeks 1 day 10 hours ago) and read 2086 times:
The question asked was what A/C have manual reversion,not what the normal power source was. 727,737,F28/100 ailerons and elevators are NORMALLY hydraulically controlled but can be moved and flown manually if you lose both A and B systems. 737 for sure. F28/100 control tabs become operable with hyd pressure loss from both SYS 1 & 2 and the tab will "fly" the control surface ala Douglas. DC9/80: The only way hydraulics control roll is by spoiler input via a mixer,just like a 727/737. Ailerons are strictly aerodynamically controlled. Elevators are also normally aerodynamicly controlled,but in a auto stall recovery mode will provide 975 psi hyd pressure for down movement only. Rudder is normally hydraulic,but can be selected manualy by a switch on the pedestal/quadrant. I haven't worked the "twenty seven" in years,but if my memory serves me,it is pretty much the same as the 737 (save for the two sets of ailerons and split rudder)
Exnonrev From United States of America, joined Oct 1999, 621 posts, RR: 4 Reply 7, posted (13 years 10 months 4 weeks 1 day 10 hours ago) and read 2083 times:
After calling an old high school friend who was a KC-135 crew chief and consulting my 1966-67 Jane's All The World's Aircraft (picked it up at a garage sale for $2.00), here's definitive word on 707/KC-135 flight controls:
KC-135 - all controls except for the rudder, spoilers, and flaps are manually operated. Powered rudder added beginning in 1962.
707 - rudder, spoilers, and leading edge slats are hydraulically operated. Variable-incidence horizontal stab electrically operated. Ailerons and elevators manually operated.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 9, posted (13 years 10 months 4 weeks 1 day 9 hours ago) and read 2076 times:
Read the post again. Closely. I did not say hydraulics did not control 727 ailerons (spoilers only). I said that applied to the DC9/MD80. Could be that my syntax,punctuation or sentence structure was confusing. On DC9's/MD80's hydraulics control: L/G,NWS,flaps/slats/rudder/spoilers/elevator down for stall recovery only. Rudder can be engaged manually by a lever (It seems EVERYTHING on that a/c is cable or lever controlled.The joke is DC=Direct Cable)