Koopas From United States of America, joined Oct 1999, 172 posts, RR: 2 Posted (12 years 9 months 3 weeks 2 days 20 hours ago) and read 4236 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)
VC-10 From United Kingdom, joined Oct 1999, 3677 posts, RR: 37 Reply 1, posted (12 years 9 months 3 weeks 2 days 20 hours ago) and read 4187 times:
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.
Robin27 From , joined Dec 1969, posts, RR: Reply 2, posted (12 years 9 months 3 weeks 2 days 20 hours ago) and read 4182 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.
Koopas From United States of America, joined Oct 1999, 172 posts, RR: 2 Reply 3, posted (12 years 9 months 3 weeks 2 days 20 hours ago) and read 4176 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.
JETPILOT From United States of America, joined May 1999, 3130 posts, RR: 32 Reply 4, posted (12 years 9 months 3 weeks 2 days 20 hours ago) and read 4176 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.
Air Canada From , joined Dec 1969, posts, RR: Reply 5, posted (12 years 9 months 3 weeks 2 days 18 hours ago) and read 4167 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.
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 6, posted (12 years 9 months 3 weeks 2 days 18 hours ago) and read 4158 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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L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 10, posted (12 years 9 months 2 weeks 6 days 17 hours ago) and read 4080 times:
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