Turboprop From Canada, joined May 2006, 0 posts, RR: 0 Posted (13 years 8 months 2 weeks 4 days 3 hours ago) and read 1019 times:
How do pilots control the the front nose gear on large aircraft. I know they use the rudder on smaller aircraft. At least I think so. I was in an L1011 cockpit once and there was a small wheel on the captains side I realize that the pilots control the aircraft with the rudder pedals on take off and landings, but what about turning into the gate or taxing etc. Hope this is not a stupid question. Thank you in advanced.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 2, posted (13 years 8 months 2 weeks 3 days 22 hours ago) and read 926 times:
Hydraulic actuators provide the "muscle" to steer,the actuators controlled by a metering valve,with feedback so the steering is proportional to input. The metering valve is either: 1) cable operated by a small wheel or tiller in the cockpit...or...2) by "wire",so to speak from a wheel or tiller in the cockpit. Some A/C have a wheel on both sides. You want my opinion? The cable operated steering "feels" better--more communicative in input/proportion to amount of steering when you taxi. The nose gear can be steered by the rudder pedals,and is used at higher speed to avoid over-controlling. A standard figure would be: (a composite to what I've found on various A/C) Nose wheel steering from tiller about 78 degrees of travel from side to side at max input...and rudder pedal steering about 7 degrees of travel to either side off center from max input.
Buzz From United States of America, joined Nov 1999, 697 posts, RR: 23 Reply 3, posted (13 years 8 months 2 weeks 3 days 12 hours ago) and read 908 times:
Good explanation NKP S2, Buzz here. NKP has it right. We use the steering "tiller" for the major turns on the ground, and getting lined up with the runway. Once the aircraft is on the runway, the rudder pedal steering is all you need, and blends in easily with the flight controls. Among other things at work i teach people to taxi and do high power engine runs. (when i'm not troubleshooting mechanical / electronic gripes)
With the DC-3 i play with on my nights off, there's NO connection between the tailwheel and the cockpit.... well i guess i forgot the tailwheel lock. To steer you use the "opposite engine" to blow the airplane in the direction you want, push a lot on the rudder pedals, and tap on a brake or two every so often. It's like sailing a boat...... more art than science.
By the way NKP S2, do you play with "Stoofs"? , reconditioned US Navy S2F's? ]
"Buzz Fuselsausage", Line Mechanic by night, DC-3 Crew Chief by choice.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 6 Reply 4, posted (13 years 8 months 2 weeks 3 days 12 hours ago) and read 901 times:
Hi Buzz. Actually NKP S2 refers to a specific RR's steam locomotive type. I do like large piston engine A/C though. A small cargo outfit (Saber) operates a fleet of DC3's whose ramp is adjacent to our hangar/hardstand. Some are painted in WW2 green...replete with US "stars" and invasion stripes. Great background music while we work,except that every time one taxis in or out,someone noise pollutes by lighting off an APU. See ya.