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Why Keep The Gear Down So Long?  
User currently offlineDL767captain From United States of America, joined Mar 2007, 2539 posts, RR: 0
Posted (6 years 4 months 1 week 3 hours ago) and read 6126 times:

I was watching a video on first flights and test flights and i noticed that they keep the landing gear down for the entire flight sometimes, and the other times don't retract the gear until a high altitude. So why do they do this?

17 replies: All unread, jump to last
 
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 1, posted (6 years 4 months 1 week 3 hours ago) and read 6130 times:
AIRLINERS.NET CREW
HEAD DATABASE EDITOR

If you're on a test flight, relying on unproven equipment, why fiddle with nonessential equipment before you're able to shake down the essential stuff?

2H4



Intentionally Left Blank
User currently offlineGeorgebush From New Zealand, joined Jul 2006, 679 posts, RR: 0
Reply 2, posted (6 years 4 months 1 week 3 hours ago) and read 6106 times:

Yea it would suck to be on a test flight, retract the gear, and then not be able to get it back down. Especially when your being filmed by 50 cameras, not good publicity.


Al Gore invented global warming.
User currently offlineKiloMikePapa From Belgium, joined Mar 2006, 3 posts, RR: 0
Reply 3, posted (6 years 4 months 1 week 2 hours ago) and read 6002 times:



Quote:
If you're on a test flight, relying on unproven equipment, why fiddle with nonessential equipment before you're able to shake down the essential stuff?

The gear is pretty essential ... for getting that expensive prototype and the possibly even more expensive test pilot back in a state allowing additional test flights Big grin!


User currently offlineJhooper From United States of America, joined Dec 2001, 6199 posts, RR: 12
Reply 4, posted (6 years 4 months 1 week 2 hours ago) and read 5938 times:

On everyday flights, occasionally the gear is left down for an extended period for brake cooling.


Last year 1,944 New Yorkers saw something and said something.
User currently offlineDL767captain From United States of America, joined Mar 2007, 2539 posts, RR: 0
Reply 5, posted (6 years 4 months 6 days 14 hours ago) and read 5596 times:



Quoting 2H4 (Reply 1):
If you're on a test flight, relying on unproven equipment, why fiddle with nonessential equipment before you're able to shake down the essential stuff?

Ya but a lot of times they eventually retract it, but they are at a very high altitude


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 6, posted (6 years 4 months 6 days 13 hours ago) and read 5589 times:
AIRLINERS.NET CREW
HEAD DATABASE EDITOR



Quoting KiloMikePapa (Reply 3):
The gear is pretty essential ... for getting that expensive prototype and the possibly even more expensive test pilot back in a state allowing additional test flights

Yeah, I could have worded that better. I was thinking about how it's not so essential to retract the gear, considering the airplane can fly with the gear down. Best to leave it down until the systems essential for flight are shaken down and proven.

2H4



Intentionally Left Blank
User currently offlineHAWK21M From India, joined Jan 2001, 31580 posts, RR: 57
Reply 7, posted (6 years 4 months 6 days 2 hours ago) and read 5436 times:

Certain Tests could be carried out warranting the Gear down for the same as per the Checklist.
Observations after being recorded,The Crew proceed to the next test on the Checklist.

regds
MEL



Think of the brighter side!
User currently offlineMir From United States of America, joined Jan 2004, 21129 posts, RR: 56
Reply 8, posted (6 years 4 months 6 days ago) and read 5415 times:

On a test flight, a lot of the equipment is unproven, so they only want to mess with it in a controlled setting with time to troubleshoot if things should go wrong - at altitude. Just in case something bad did happen on the takeoff and they needed to come around for landing, it wouldn't be ideal to have the first extension of the gear be one where they really needed it down, and needed it down quickly.

-Mir



7 billion, one nation, imagination...it's a beautiful day
User currently offlineUPSMD11 From United States of America, joined May 2003, 805 posts, RR: 4
Reply 9, posted (5 years 7 months 3 weeks 1 day 13 hours ago) and read 4688 times:
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I was on a flight today (CR7 out of MDT) and the gear seemed to stay down until we were at about 10,000 ft at least, maybe a bit lower.

We had a normal take off, no rejection. We had a long slow taxi to the runway but the weather was warm, like 91F. Would that be a good reason, alone, to leave the gear down so long?

I was sitting right over the wing and gear so I could hear it pretty well.

Cheers,
John

p.s. by chance someone had posted a new thread asking this same question today!


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 10, posted (5 years 7 months 3 weeks 1 day 10 hours ago) and read 4627 times:



Quoting UPSMD11 (Reply 9):
We had a long slow taxi to the runway but the weather was warm, like 91F. Would that be a good reason, alone, to leave the gear down so long?

Was it a long flight (for a CR7)? Long slow taxi at high gross weight, plus warm weather, is a good situation to want tire and brake cooling after takeoff.

Tom.


User currently offlineUPSMD11 From United States of America, joined May 2003, 805 posts, RR: 4
Reply 11, posted (5 years 7 months 3 weeks 1 day 7 hours ago) and read 4598 times:
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Quoting Tdscanuck (Reply 10):
Was it a long flight (for a CR7)? Long slow taxi at high gross weight, plus warm weather, is a good situation to want tire and brake cooling after takeoff.

It wasn't that long, MDT - ATL. That is about 691 miles and about 1.5 hours of flying time.

We ended up going all the way to 38,000 feet during cruise and I know those gear were down until about 10,000 at least.

I could hear something in the wind, wondered what it was and then I heard the gear go up.

John


User currently offlineHAWK21M From India, joined Jan 2001, 31580 posts, RR: 57
Reply 12, posted (5 years 7 months 2 weeks 3 days 21 hours ago) and read 4384 times:



Quoting UPSMD11 (Reply 9):
I was on a flight today (CR7 out of MDT) and the gear seemed to stay down until we were at about 10,000 ft at least, maybe a bit lower.

High Brake Temperatures?
regds
MEL.



Think of the brighter side!
User currently offlineStratosphere From United States of America, joined Sep 2007, 1647 posts, RR: 4
Reply 13, posted (5 years 7 months 2 weeks 3 days 9 hours ago) and read 4288 times:

On a test flight anything goes basically.. But in the revenue world I have seen both gear slow to retract ( usually brake cooling) and I have seen gear dropped way early. I was on a NW DC-10 into MSP that dropped the gear with no flaps pretty high up. The Capt came on and said we were a little high and he would be dropping the gear to lose altitude.


NWA THE TRUE EVIL EMPIRE
User currently offlineHAWK21M From India, joined Jan 2001, 31580 posts, RR: 57
Reply 14, posted (5 years 7 months 2 weeks 2 days 21 hours ago) and read 4209 times:



Quoting Stratosphere (Reply 13):
I was on a NW DC-10 into MSP that dropped the gear with no flaps pretty high up. The Capt came on and said we were a little high and he would be dropping the gear to lose altitude.

Were Spoilers deployed too?
regds
MEL.



Think of the brighter side!
User currently offlineUAL Bagsmasher From United States of America, joined Sep 1999, 2143 posts, RR: 10
Reply 15, posted (5 years 7 months 2 weeks 2 days 20 hours ago) and read 4200 times:

UPSMD11, chances are the aircraft in question had an MEL for the MLG bay overheat system. One of the stipulations is that the gear must be left down for so many minutes to ensure proper tire and brake cooling, since you have no way of knowing if that gear is overheating with the overheat system MEL'd.

User currently offlineRJ111 From , joined Dec 1969, posts, RR:
Reply 16, posted (5 years 7 months 2 weeks 2 days 18 hours ago) and read 4162 times:

Is there a speed limit with the gear down?

User currently offlineHAWK21M From India, joined Jan 2001, 31580 posts, RR: 57
Reply 17, posted (5 years 7 months 2 weeks 2 days 14 hours ago) and read 4130 times:



Quoting RJ111 (Reply 16):

Is there a speed limit with the gear down?

There Def is....apart from providing drag,you don't want the L/G to be subject to damage due to high relative airlow.
regds
MEL



Think of the brighter side!
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