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Pushback Using MLG -- B737  
User currently offlineBrenintw From Taiwan, joined Jul 2006, 1612 posts, RR: 1
Posted (7 years 8 months 1 hour ago) and read 3495 times:

When I was in New Zealand earlier this year, I saw a B737NG being pushed back -- using the MLG. I've always thought that the NLG was used for pushback, I've never seen this before.

Questions: Why use the MLG instead of the NLG? Is this common?

I snapped a pic which is at: http://public.fotki.com/irltrucks/tr...06/queenstown_oamaru/img_5904.html


I'm tired of the A vs. B sniping. Neither make planes that shed wings randomly!
13 replies: All unread, jump to last
 
User currently offlineTbanger From Australia, joined Jul 2004, 266 posts, RR: 0
Reply 1, posted (7 years 8 months ago) and read 3483 times:

Been using them in SYD Domestic terminals and I also believe MEL for a couple of years now. Rather than have a tow driver and a starter, you just have the starter do both as the tug is remote controlled.

I believe the pilot steers!


User currently offlineTristarSteve From Sweden, joined Nov 2005, 3982 posts, RR: 34
Reply 2, posted (7 years 7 months 4 weeks 1 day 20 hours ago) and read 3457 times:

Quoting Brenintw (Thread starter):
Questions: Why use the MLG instead of the NLG? Is this common?

The main reason is that all you have to do is turn the wheel. There is no need to lift the aircraft or steer so the machine is much simpler.
I had it demonstrated in ARN about 10 years ago, but we ended up with TBL instead.


User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 3, posted (7 years 7 months 4 weeks 1 day 20 hours ago) and read 3456 times:

Optional.
However out here We never use it.It requires Good communication between Flt deck & Grd to know when & how much to steer the NLG.
regds
MEL



Think of the brighter side!
User currently offlineCurmudgeon From Australia, joined Oct 2006, 695 posts, RR: 22
Reply 4, posted (7 years 7 months 4 weeks 1 day 11 hours ago) and read 3378 times:

That unit is called a "Power Push", and is in fact remote controlled. The engineer conducting the pushback does require good communication with the pilot, and simple commands like "steer left" etc are used.

The unit attaches to the main gear, drives on command, and detaches itself and drives away, all by remote.

There is a seat and conventional controls that is used for driving the unit between gates.

These were sold as a cheaper alternative to tugs and tow bars and a driver + engineer. Industrial and other factors have limited their widespread use. I don't know how they perform in snow.

Cheers



Jets are for kids
User currently offlineAirfoilsguy From , joined Dec 1969, posts, RR:
Reply 5, posted (7 years 7 months 4 weeks 1 day 9 hours ago) and read 3341 times:

The unit is located behind the main landing gear so wouldn't it be pulling rather then pushing? Also, the engine seems to be running, that would be a very windy place to be sitting if the thing had a driver..

Oh, by the way, nice birds  Wink


User currently offlineBrenintw From Taiwan, joined Jul 2006, 1612 posts, RR: 1
Reply 6, posted (7 years 7 months 4 weeks 1 day 6 hours ago) and read 3315 times:

Quoting TristarSteve (Reply 2):
but we ended up with TBL instead

What is TBL?



I'm tired of the A vs. B sniping. Neither make planes that shed wings randomly!
User currently offlineTbanger From Australia, joined Jul 2004, 266 posts, RR: 0
Reply 7, posted (7 years 7 months 4 weeks 23 hours ago) and read 3257 times:

Quoting Brenintw (Reply 6):
What is TBL

Tow Bar Less.


View Large View Medium
Click here for bigger photo!

Photo © David James Clelford



Above is a towbarless tug. has a driver, but no towbar.

[Edited 2006-12-05 10:08:33]

User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 8, posted (7 years 7 months 4 weeks 23 hours ago) and read 3254 times:

Quoting Curmudgeon (Reply 4):
The unit attaches to the main gear, drives on command, and detaches itself and drives away, all by remote

Whats the Attach mechanism like.Also what would the Capacity of this unit be approx.

Quoting Airfoilsguy (Reply 5):
Also, the engine seems to be running, that would be a very windy place to be sitting if the thing had a driver..

Engine would not be running on that side.
regds
MEL



Think of the brighter side!
User currently offlineTristarSteve From Sweden, joined Nov 2005, 3982 posts, RR: 34
Reply 9, posted (7 years 7 months 4 weeks 22 hours ago) and read 3246 times:

Quoting Curmudgeon (Reply 4):
I don't know how they perform in snow.

That is its best feature. The Mainwheels stay on the ground, and the Powerpush just rotates them. The problem with a TBL is that it lifts the nosegear and then drives out. On many aircraft the weight on the nosewheel is very small, and we used to have trouble getting traction. We have now got rough gravel glued to the pushback area to get a grip.
A normal towbar tractor is much better as it weighs so much, but a TBL is very light weight and needs the aircraft weight to get a grip.


User currently offlinePihero From France, joined Jan 2005, 4392 posts, RR: 76
Reply 10, posted (7 years 7 months 4 weeks 19 hours ago) and read 3239 times:
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The powerpush is generalised on AF stations in France for the single-aisle fleet.The economical savings are quite enormous as they use very little power for the job and only one operator.
This is how we use it :
1/Connect the PPU -as it is called - to the left gear.The motor turn a set of rollers, which, being in contact with the tyres, force them to turn, therefore moving the aircraft.
2/Start engine #2 in order to get some hydraulic power.
3/Commence push. The pilot indicates the direction to which the nose will point and the ckeared taxiway line colour (here in CDG, we have a yellow centerline and a blue and an orange).
the operator then directs the pilot with clear steering indications : "Steer left...more left...less left...tiller to neutral..."
4/Disconnect the PPU
5/Start #1 engine.... and away you go!
Plese note that the nose gear safety pin remains in place all the time.



Contrail designer
User currently offlineJetMech From Australia, joined Mar 2006, 2684 posts, RR: 53
Reply 11, posted (7 years 7 months 4 weeks 19 hours ago) and read 3233 times:

Quoting Pihero (Reply 10):
Plese note that the nose gear safety pin remains in place all the time.

G'day Pihero  Smile,

Are you referring to the nose gear steering lock out pin or the nose gear retraction lockout pin?

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlinePihero From France, joined Jan 2005, 4392 posts, RR: 76
Reply 12, posted (7 years 7 months 4 weeks 19 hours ago) and read 3229 times:
Support Airliners.net - become a First Class Member!

Quoting JetMech (Reply 11):
Are you referring to the nose gear steering lock out pin

hello, JetMech,
Yes. I've seen so many ways of calling that damn pin : by-pass pin. safety pin, lock-out pin, the thing there  Smile etc...



Contrail designer
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 13, posted (7 years 7 months 4 weeks 18 hours ago) and read 3226 times:

Quoting JetMech (Reply 11):
Are you referring to the nose gear steering lock out pin or the nose gear retraction lockout pin



Quoting Pihero (Reply 12):
Yes. I've seen so many ways of calling that damn pin : by-pass pin. safety pin, lock-out pin, the thing there etc

Out here its called the Nose gear Steering Valve bypass pin.  Smile

regds
MEL



Think of the brighter side!
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