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Uneven Reverser Deployment, Is It Normal?  
User currently offlinen797mx From United States of America, joined Mar 2009, 370 posts, RR: 0
Posted (3 years 9 months 6 days 5 hours ago) and read 5033 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 9 months 6 days 3 hours ago) and read 4961 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 9 months 6 days 2 hours ago) and read 4907 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 9 months 6 days 1 hour ago) and read 4874 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 onlinelonghauler From Canada, joined Mar 2004, 6063 posts, RR: 43
Reply 4, posted (3 years 9 months 6 days ago) and read 4827 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, 7561 posts, RR: 76
Reply 5, posted (3 years 9 months 5 days 23 hours ago) and read 4801 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, 2064 posts, RR: 12
Reply 6, posted (3 years 9 months 4 days 12 hours ago) and read 4435 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 9 months 3 days 5 hours ago) and read 4146 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 9 months 2 days 13 hours ago) and read 4010 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, 1840 posts, RR: 4
Reply 9, posted (3 years 9 months 1 day 17 hours ago) and read 3839 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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