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Nose Gear Pin Removed After Pushback/powerback  
User currently offlineKoopas From United States of America, joined Oct 1999, 172 posts, RR: 1
Posted (14 years 4 months 3 weeks 4 days 15 hours ago) and read 7442 times:

Hello,

What kind of pin is removed before taxiing? I've heard of two types of pins.

1) The safety bypass pin (inserted to prevent the nose gear from retracting/collapsing)
2) The steering lock pin (to prevent the gear from turning by rudder pedals input)

Thanks for the clarification.
Koopas

10 replies: All unread, jump to last
 
User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3708 posts, RR: 34
Reply 1, posted (14 years 4 months 3 weeks 4 days 14 hours ago) and read 7393 times:
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The steering By-pass pin is removed before taxi. This pin via an isolation valve isolates the steering actuators from the hydraulics so the tug can turn the nosegear.

It is part of the Flt Dk crew pre-flight to chk the nosegear downlock pin is removed before flt.


User currently offlineRobin27 From , joined Dec 1969, posts, RR:
Reply 2, posted (14 years 4 months 3 weeks 4 days 14 hours ago) and read 7388 times:

After push back the nose leg lock pin is removed. From what I remember at BA / LHR the pushback engineer then holds the pin up with its warning flag for the captain to see on the wave off.

User currently offlineKoopas From United States of America, joined Oct 1999, 172 posts, RR: 1
Reply 3, posted (14 years 4 months 3 weeks 4 days 14 hours ago) and read 7382 times:

VC10, is the nosegear downlock pin the same as the steering pin? Or are you talking about the same pin?

Are 2 pins removed? I've only seen one pin being waved by the marshall to the pilots.


User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 4, posted (14 years 4 months 3 weeks 4 days 14 hours ago) and read 7382 times:

It depends on the aircraft. Some have 2 pins and some have one.

The two different ypes of pins as previously mentioned are the steering bypass pin, and the gear pins.

The steering bypass pin is inserted to disconnect hydraulic power ffor the steering from the nose wheel tiller, and the rudder pedals.

Not all planes have this. Even if they have it it is seldom used. It is common practice to disconnect trhe nose wheel steering torque linkage anytime the tow bar is connected. Some companies even remove hydraulic power to the system as further backup.

The gear pins are only inserted to perform maintenance functions on the airplane, and are not usually installed on a regular basis. However again it is some companies policy that whenever the plane is under tow the nose gear must be pinned.

So the pin that the marshall holds up is either the nose gear pin, or the steering bypass pin. depending on comapny policy.

JET


User currently offlineAir Canada From , joined Dec 1969, posts, RR:
Reply 5, posted (14 years 4 months 3 weeks 4 days 13 hours ago) and read 7373 times:

Hi all,

At Air Canada, we used to use a nose down-lock pin to secure the nose gear from retracting while towing/push-back, however, this is no longer used for ramp operations. They used to be used on most aircraft types, however, the only a/c we use it on now is for towing operations with BAe-146's. I beleive maintenance still uses this pin during maintenance operations.
We do use a steering by-pass pin for all operations on all a/c (except B-737's which don't use any pins and BAe-146's).
As mentioned, this pin disconnects the hydraulics so the nose wheel can only be turned by the tow tractor and not with the steering tiller or rudder pedals.

Phil


User currently offlineL-188 From United States of America, joined Jul 1999, 29836 posts, RR: 58
Reply 6, posted (14 years 4 months 3 weeks 4 days 12 hours ago) and read 7364 times:

We had a discussion a while back about the nosegear pins.

On the 737 we finally decided that you could either insert a bypass pin to isolate the steering or shutdown the "A" hydraulic system. When I was at Alaska they did the latter, but a bypass pin was used on the MD-80's.

A lot of aircraft you don't worry about it, On the Metro as long as you keep the tires between the red lines on the NLG you are fine. A Lear has a steering deactivation switch, when it shuts down there are no turn limits. A CASA 212 has a pair of spring loaded pins on the nose gear scissors link that disconects the link. Then you can turn that nosegear through 360.




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User currently offlineDC10 From Canada, joined Apr 2007, 0 posts, RR: 0
Reply 7, posted (14 years 4 months 3 weeks 4 days 7 hours ago) and read 7343 times:

Hi, I think that we can see the steering lock pin on the following (and very nice) photo:

Click for large version
Click here for full size photo!

Photo © Colin K. Work


Am i wrong?
Regards
DC10


User currently offlineVC-10 From United Kingdom, joined Oct 1999, 3708 posts, RR: 34
Reply 8, posted (14 years 4 months 3 weeks 3 days 20 hours ago) and read 7314 times:
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DC10

Yes you are wrong, it is on the RHS of the leg


User currently offlineRobin27 From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 4 months 3 weeks 1 day 16 hours ago) and read 7296 times:

An excellent picture of a 737 bypass pin can be found here.

http://www.chris.brady.ukgateway.net/nosewheel.htm


User currently offlineL-188 From United States of America, joined Jul 1999, 29836 posts, RR: 58
Reply 10, posted (14 years 4 months 3 weeks 1 day 11 hours ago) and read 7286 times:

Here is a shot from the front of the aircraft.


Click for large version
Click here for full size photo!

Photo © Rafal Szczypek




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