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Uneven Reverser Deployment, Is It Normal?  
User currently offlinen797mx From United States of America, joined Mar 2009, 368 posts, RR: 0
Posted (3 years 8 months 1 week 4 days 1 hour ago) and read 5004 times:

Today I was watching this video of an MD-11 landing and noticed that the reversers did not deploy simultaneously as normally seen on airliners. Is this a commonality in some cases, was the pilot doing this to correct for not being on center, or was he just clumsy and did not pull the reverser handles evenly?

The second landing is the one I am referring to:

Clear skies and strong tail winds.
9 replies: All unread, jump to last
User currently offlineXFSUgimpLB41X From United States of America, joined Aug 2000, 4300 posts, RR: 34
Reply 1, posted (3 years 8 months 1 week 3 days 22 hours ago) and read 4932 times:

That looked pretty even to me... within a second of each other.

Chicks dig winglets.
User currently offlinewingscrubber From UK - England, joined Sep 2001, 862 posts, RR: 0
Reply 2, posted (3 years 8 months 1 week 3 days 21 hours ago) and read 4878 times:

Yep #3 reverser seems to deploy a couple of seconds before #1, with #2 out of camera shot.
My theory: either the reversers were manually activated out of sequence (most likely) or, because each thrust reverser is powered by a separate hydraulic system, if engine RPM was higher on engine #3, it would have higher available flow from the hydraulic pumps, which could have opened the right hand TR more quickly.

Resident TechOps Troll
User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2268 posts, RR: 6
Reply 3, posted (3 years 8 months 1 week 3 days 20 hours ago) and read 4845 times:

I think y'all are getting way too technical. I would say if you think about it or if you've ever held the reverse levers in your hand that it's very easy for the little fingers on no.3 to lift slightly before your other fingers pull #1 & #2. not a big deal. Also if the rpm were higher as one post suggests then the throttle would not be in idle and the reverser would not deploy. Sometime they can be a little more difficult than others in moving the levers.

User currently offlinelonghauler From Canada, joined Mar 2004, 6005 posts, RR: 43
Reply 4, posted (3 years 8 months 1 week 3 days 19 hours ago) and read 4798 times:

Exactly, it's just a mechanical lever, and some are easier than others ... making one deploy quicker than the other. It is not normally a big deal. Heck, when you are dispatched with one reverser inop, you still use the other on landing or rejected take-off.

Just because I stopped arguing, doesn't mean I think you are right. It just means I gave up!
User currently offlinemandala499 From Indonesia, joined Aug 2001, 7526 posts, RR: 76
Reply 5, posted (3 years 8 months 1 week 3 days 18 hours ago) and read 4772 times:

Hey, you can land without reversers (it's not included in the dispatch landing calculations)... so, what's the big deal? And these guys were just pulling idle reverse, which is a "just in case" you need the reversers at full if something goes wrong.

Nothing to see here... move along...   

When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlinetb727 From United States of America, joined Jun 2005, 2048 posts, RR: 12
Reply 6, posted (3 years 8 months 1 week 2 days 7 hours ago) and read 4406 times:

That's also why we wait until you have all the deployed lights illuminated before you pull anything more than idle thrust in reverse.

Too lazy to work, too scared to steal!
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 7, posted (3 years 8 months 1 week 1 day ago) and read 4117 times:

Quoting longhauler (Reply 4):
It is not normally a big deal. Heck, when you are dispatched with one reverser inop, you still use the other on landing or rejected take-off.

Exactly what I was thinking..............but a no go in rain though....out here.A monsoon SOP.

[Edited 2012-08-30 13:25:02]

Think of the brighter side!
User currently offlineCosmicCruiser From United States of America, joined Feb 2005, 2268 posts, RR: 6
Reply 8, posted (3 years 8 months 1 week 8 hours ago) and read 3981 times:

We can go with one inop AND on a contaminated runway but with a big weight penalty.

I landed the other night with no. 2 inop. F/O was flying, had no problems.

User currently offlineB777LRF From Luxembourg, joined Nov 2008, 1829 posts, RR: 4
Reply 9, posted (3 years 8 months 6 days 12 hours ago) and read 3810 times:

Sticky lever.

If memory serves me right the reverser on no. 2 is delayed until NLG touch-down. She can be a tricky bird to land, and comes in a bit on the fast side. Not that I'd say no to having a go, of course.

From receips and radials over straight pipes to big fans - been there, done that, got the hearing defects to prove
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