liedetectors
Posts: 323
Joined: Thu Jul 21, 2005 10:44 am

Taxiing With TRs Extended

Tue Aug 23, 2005 8:27 am

Hey sports fans!

I was sitting in my office today and i notice a Gulfstream G-IV and a Falcon Jet of some kind (and no it wasnt an F-16) taxi by and they had the TRs extended. They were clearly taxiing for T/O as they did soon after, so dont tell me that the pilots didnt retracted them after landing. My question is why were they taxiing with them extended?

Thanks.
If it was said by us, then it must be true.
 
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kc135topboom
Posts: 10997
Joined: Sun Jan 30, 2005 2:26 am

RE: Taxiing With TRs Extended

Tue Aug 23, 2005 8:39 am

It is common to adjust your taxi speed with the thrust reversers deployed. Occasionally a commerical aircraft will do it. I have seen the TRs deployed here at DFW for airplanes going downhill after crossing one of the taxiway bridges here.
 
liedetectors
Posts: 323
Joined: Thu Jul 21, 2005 10:44 am

RE: Taxiing With TRs Extended

Tue Aug 23, 2005 9:04 am

excellent. yea i just confirmed that information with some co-workers
If it was said by us, then it must be true.
 
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HAWK21M
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RE: Taxiing With TRs Extended

Tue Aug 23, 2005 5:19 pm

Taxing speed can be reduced with T/Rs & not using the Brakes too.In the Early 90s.Damania Airways,a Pvt Operator had instructed their Staff on Min use of Brakes.Their 1st B737 Brake change appeared after Three months.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
citation501sp
Posts: 178
Joined: Thu May 25, 2000 10:19 pm

RE: Taxiing With TRs Extended

Wed Aug 24, 2005 12:30 am

It is pretty common on Gulfstream G-IVs, Falcon 2000's, and Citation X's.

The Engines have a surplus of thrust at idle, enough to still accelerate the aircraft once rolling. So rather than ride the brakes, one side's "buckets" will be put to the wind. Thus saving riding the brakes. Or if going down hill both sides are put out.

Besides it looks great. I love the big buckets on the G-IV's.

501sp
Smoke and Thunder! Stage 2 FOREVER!!!
 
RedDragon
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Joined: Sat Jul 03, 2004 2:24 am

RE: Taxiing With TRs Extended

Wed Aug 24, 2005 4:53 am

Quoting HAWK21M (Reply 3):
In the Early 90s.Damania Airways,a Pvt Operator had instructed their Staff on Min use of Brakes.Their 1st B737 Brake change appeared after Three months.

What kind of interval would you expect a brake change after?

Rich
 
fly707
Posts: 340
Joined: Sat Oct 27, 2001 9:43 am

RE: Taxiing With TRs Extended

Wed Aug 24, 2005 4:55 am

May be because the engines are high from ground ( rear section ) .
In other types such as Boeing 767 or airbus 300 engines are so near from ground . Using TRs on these types may cause sand, small stones suction, that will cause engine damage .

Using brakes would be much more cheaper than using TRs during taxing .

Regards .
Without mistakes we will never learn
 
kcrwflyer
Posts: 2525
Joined: Tue May 18, 2004 11:57 am

RE: Taxiing With TRs Extended

Wed Aug 24, 2005 5:48 am

Quoting Fly707 (Reply 6):
Using brakes would be much more cheaper than using TRs during taxing .

Regards .

how, its just idle.
 
777wt
Posts: 828
Joined: Wed Jan 19, 2005 7:45 am

RE: Taxiing With TRs Extended

Wed Aug 24, 2005 7:07 am

Quoting Fly707 (Reply 6):
Using brakes would be much more cheaper than using TRs during taxing .

Not on most coporate jets. They have brake temp limits for takeoff shall a RTO is needed.

I've seen Gulfstreams use T/R at HPN. Just idle thrust, no additional thrust off idle, otherwise you would hear it roar with it deployed.

If the brakes gets over the limit, then that will cost you time and fuel waiting for it to cool down (idling in the runup area), possibly adding mess to the ground traffic if there are other a/c in line waiting to take off.

Thrust reverse doesn't shorten engine life if it's just deployed but not off idle. Add power while in thrust reverse will considerably shorten the life due to increased EGT.

As for most airliners, they use idle thrust reverse to conserve fuel and engine life unless it's really needed.
 
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HAWK21M
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RE: Taxiing With TRs Extended

Wed Aug 24, 2005 9:12 pm

Quoting RedDragon (Reply 5):
What kind of interval would you expect a brake change after

Its competitor operating the same type had Brake changes on average 1.5 months.Both operated similiar sectors & no of flts.
regds
MEL
I may not win often, but I damn well never lose!!! ;)

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