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Manual Reversion Flight Controls...  
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Posted (14 years 10 months 2 weeks 5 days 16 hours ago) and read 3053 times:

What planes in addition to the DC8 and 727 have manual reversion backup in the event of loss of hydraulic assist flight controls?

11 replies: All unread, jump to last
 
User currently offlineAsqx From United States of America, joined Jun 1999, 618 posts, RR: 0
Reply 1, posted (14 years 10 months 2 weeks 5 days 16 hours ago) and read 2930 times:

It has nothing to do with commercial airliners but I know for certain the A-10 does.

Regards,
ASQX


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 2, posted (14 years 10 months 2 weeks 5 days 15 hours ago) and read 2926 times:

737,727,F28,F100,DC9/MD80--whose ailerons and elevators are "manual" anyway but the rudder has manual reversion.

User currently offlineExnonrev From United States of America, joined Oct 1999, 621 posts, RR: 3
Reply 3, posted (14 years 10 months 2 weeks 5 days 8 hours ago) and read 2914 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.


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 4, posted (14 years 10 months 2 weeks 5 days 7 hours ago) and read 2906 times:

Thanks ex-nonrev for the info on the 707.

User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 5, posted (14 years 10 months 2 weeks 5 days 7 hours ago) and read 2902 times:

NKP S2: The 727, 737, DC9/MD*) all have hydraulic boosted ailerons and elevators. I don't know where you got this info!

No offesnse intended Exonrev but that doesn't sound right to me. I can't imagine the flight controls on a boeing 707 being manually powered.

If Buff or CALpilot is reading this thread do the flight controls on the 757 revert to manual reversion if you lose hydraulics?


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 6, posted (14 years 10 months 2 weeks 5 days 5 hours ago) and read 2899 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)

User currently offlineExnonrev From United States of America, joined Oct 1999, 621 posts, RR: 3
Reply 7, posted (14 years 10 months 2 weeks 5 days 5 hours ago) and read 2896 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.

I apologize for the misinformation.


User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 8, posted (14 years 10 months 2 weeks 5 days 5 hours ago) and read 2893 times:

On the 727 ailerons are powered hydraulicly by both A and B system.

I have to correct myself. I don't know about the DC9/MD80. I don't know why I included it with the 727 when talking about powered elevators.

You state that the only way hydraulics control roll on the 727 is by the use of the spoilers. But previously you state that the aelerons on the 727 are hydraulic powered. ???

For the record the ailerons on the 727 are hydraulic from both A and B system.

The 727 also has powered elevators.

In order to have manual reversion the control surface in the normal mode needs to be hydraulicly powered.

Exnonrev: It sounds like you got a good buy on that Janes. Thanks for the info.


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 9, posted (14 years 10 months 2 weeks 5 days 4 hours ago) and read 2889 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)

User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 10, posted (14 years 10 months 2 weeks 5 days 4 hours ago) and read 2891 times:

Got it. Thanks.

Paragraphs would help. Just a kind suggestion.

JET


User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 11, posted (14 years 10 months 2 weeks 5 days 4 hours ago) and read 2888 times:

Paragraphs would surely help,that's after I learn to progress beyond the "hunt and peck" school of typing.   Later.

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