JETPILOT
Topic Author
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

Manual Reversion Flight Controls...

Mon Jan 17, 2000 4:01 pm

What planes in addition to the DC8 and 727 have manual reversion backup in the event of loss of hydraulic assist flight controls?
 
User avatar
asqx
Posts: 597
Joined: Tue Jun 15, 1999 4:56 pm

RE: Manual Reversion Flight Controls...

Mon Jan 17, 2000 4:32 pm

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

Regards,
ASQX
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Manual Reversion Flight Controls...

Mon Jan 17, 2000 5:14 pm

737,727,F28,F100,DC9/MD80--whose ailerons and elevators are "manual" anyway but the rudder has manual reversion.
 
exnonrev
Posts: 598
Joined: Tue Oct 19, 1999 4:26 am

RE: Manual Reversion Flight Controls...

Tue Jan 18, 2000 12:08 am

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
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Manual Reversion Flight Controls...

Tue Jan 18, 2000 1:04 am

Thanks ex-nonrev for the info on the 707.
 
JETPILOT
Topic Author
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Manual Reversion Flight Controls...

Tue Jan 18, 2000 1:37 am

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?
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

JET Pilot

Tue Jan 18, 2000 2:41 am

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
Posts: 598
Joined: Tue Oct 19, 1999 4:26 am

Correction

Tue Jan 18, 2000 3:00 am

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.
 
JETPILOT
Topic Author
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Manual Reversion Flight Controls...

Tue Jan 18, 2000 3:28 am

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.
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

RE: Jet Pilot

Tue Jan 18, 2000 3:41 am

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)
 
JETPILOT
Topic Author
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Jet Pilot

Tue Jan 18, 2000 4:12 am

Got it. Thanks.

Paragraphs would help. Just a kind suggestion.

JET
 
NKP S2
Posts: 1665
Joined: Mon Dec 20, 1999 3:16 am

No Problem

Tue Jan 18, 2000 4:18 am

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

Popular Searches On Airliners.net

Top Photos of Last:   24 Hours  •  48 Hours  •  7 Days  •  30 Days  •  180 Days  •  365 Days  •  All Time

Military Aircraft Every type from fighters to helicopters from air forces around the globe

Classic Airliners Props and jets from the good old days

Flight Decks Views from inside the cockpit

Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior

Cargo Aircraft Pictures of great freighter aircraft

Government Aircraft Aircraft flying government officials

Helicopters Our large helicopter section. Both military and civil versions

Blimps / Airships Everything from the Goodyear blimp to the Zeppelin

Night Photos Beautiful shots taken while the sun is below the horizon

Accidents Accident, incident and crash related photos

Air to Air Photos taken by airborne photographers of airborne aircraft

Special Paint Schemes Aircraft painted in beautiful and original liveries

Airport Overviews Airport overviews from the air or ground

Tails and Winglets Tail and Winglet closeups with beautiful airline logos