Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Preflight Check: Thrust Reversers  
User currently offlineQslinger From India, joined Apr 2006, 261 posts, RR: 0
Posted (5 years 2 weeks 6 days 6 hours ago) and read 5009 times:

Hi,

During preflight checks, the captain checks all the control surfaces like the rudder, flaps, ailerons, speed brakes etc but why are the thrust reversers not checked?

I understand that most of the braking comes from the brakes in the MLG and some of it from thrust reversers and the speed brake. But the speed brake is checked before takeoff but the thrust reverser is not. Why is that?


Raj Koona
19 replies: All unread, jump to last
 
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 1, posted (5 years 2 weeks 6 days 6 hours ago) and read 4994 times:

The reversers shouldn't be used below 60kts to prevent FOD ingestion.

User currently offlineBigSaabowski From United States of America, joined Jul 2008, 158 posts, RR: 0
Reply 2, posted (5 years 2 weeks 6 days 6 hours ago) and read 4994 times:

Speed brakes and flaps are not specifically checked on the aircraft that I'm familiar with. The FO (sometimes the captain) does a primary flight control check and that's when you may see the spoilers automatically deploy on the "wing-down" side. The full travel of the flaps is not checked either, they're simply moved to the takeoff setting. I guess the reversers are not considered a critical-enough item to warrant an individual check. There's not enough time to check everything.

User currently offlinePilotpip From United States of America, joined Sep 2003, 3150 posts, RR: 10
Reply 3, posted (5 years 2 weeks 6 days 5 hours ago) and read 4981 times:

Thrust reversers are not required and in fact one or more can be deferred. Jetpilot already mentioned the FOD issue. Cascade reversers are most effective at higher speeds. My only experience is in the Embraer 170 and after 80 kts, the only noticeable difference between 120kts and 80kts is the noise. We're not supposed to use more than idle thrust below 80 and it's only allowed in emergency situations below 60. If one of the reversers are deferred and "pinned" shut, you won't get more than idle out of the other one anyway.

Flaps usually aren't "checked", they're set to the T/O position and left there. I don't know of anybody that checks the speed brake either. What you are seeing is roll spoilers, or Multifunction spoilers which serve as roll spoilers and speed brakes/lift dump spoilers.

At both airlines I've worked at, the F/O performs the control check as part of their before taxi or taxi flow.



DMI
User currently offlineDashTrash From United States of America, joined Aug 2006, 1528 posts, RR: 2
Reply 4, posted (5 years 2 weeks 6 days 5 hours ago) and read 4977 times:

We check them in a lot of bizjets. All the Citations require a check on the first flight of the day, and any flight where the landing numbers are predicated on operative reversers.

User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 5, posted (5 years 2 weeks 6 days 5 hours ago) and read 4975 times:

The thrust reversers are checked prior to takeoff: That test comes during the previous landing. If the thrust reversers failed to function on the previous landing they would be written up and repaired or locked out, prior to further dispatch.

User currently offlineKELPkid From United States of America, joined Nov 2005, 6388 posts, RR: 3
Reply 6, posted (5 years 2 weeks 6 days 4 hours ago) and read 4959 times:



Quoting DashTrash (Reply 4):
We check them in a lot of bizjets. All the Citations require a check on the first flight of the day, and any flight where the landing numbers are predicated on operative reversers.

From my lineboy days, I remember a few flight crews on bizjets actually popping the reversers open and checking things out as part of their preflight (usually the clamshell type...). I always wondered how you did that without the engines started  Wink



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 7, posted (5 years 2 weeks 5 days 23 hours ago) and read 4903 times:



Quoting Qslinger (Thread starter):
why are the thrust reversers not checked

Maintence does it in the check requiring it prior.....any malfunction to the TR can be highlighted by a visual warning in the flight deck.
Although moving the thrust levers with Engines shut down ensures the T/r interconnect is not obstructed.
regds
MEL.



Think of the brighter side!
User currently offlineDashTrash From United States of America, joined Aug 2006, 1528 posts, RR: 2
Reply 8, posted (5 years 2 weeks 5 days 17 hours ago) and read 4824 times:



Quoting KELPkid (Reply 6):
From my lineboy days, I remember a few flight crews on bizjets actually popping the reversers open and checking things out as part of their preflight (usually the clamshell type...). I always wondered how you did that without the engines started

Dunno.

Our test is on the taxi checks. We pop them using normal means, then stow them via the emer. stow switches. They're hydraulic, so we have to have engines running to get them open I don't think the aux pump has enough muscle to get them open, and it only runs one system anyway.


User currently offlineSwiftski From Australia, joined Dec 2006, 2701 posts, RR: 2
Reply 9, posted (5 years 2 weeks 5 days 16 hours ago) and read 4802 times:

Don't know the rules elsewhere, but a/c are meant to be able to stop completely using brakes alone - reverse thrusters just make things easier and do not in all cases have to be operational to dispatch.

User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 10, posted (5 years 2 weeks 5 days 15 hours ago) and read 4796 times:



Quoting Swiftski (Reply 9):
Don't know the rules elsewhere, but a/c are meant to be able to stop completely using brakes alone - reverse thrusters just make things easier and do not in all cases have to be operational to dispatch.

They don't have to be operational for dispatch, but if they inoperable it must be noted, so the crew knows and can plan their landing correctly.


User currently offlineTristarSteve From Sweden, joined Nov 2005, 4009 posts, RR: 33
Reply 11, posted (5 years 2 weeks 5 days 15 hours ago) and read 4795 times:

On the RB211 the reversers are checked stowed and locked on the preflight check. They must not be operated before takeoff.

User currently offlineSwiftski From Australia, joined Dec 2006, 2701 posts, RR: 2
Reply 12, posted (5 years 2 weeks 5 days 15 hours ago) and read 4795 times:



Quoting 474218 (Reply 10):
They don't have to be operational for dispatch, but if they inoperable it must be noted, so the crew knows and can plan their landing correctly.

Agreed.


User currently offlineDashTrash From United States of America, joined Aug 2006, 1528 posts, RR: 2
Reply 13, posted (5 years 2 weeks 5 days 14 hours ago) and read 4761 times:

What are reverse thrusters? Big grin

User currently offlineKELPkid From United States of America, joined Nov 2005, 6388 posts, RR: 3
Reply 14, posted (5 years 2 weeks 5 days 11 hours ago) and read 4697 times:



Quoting DashTrash (Reply 13):
What are reverse thrusters?

http://en.wikipedia.org/wiki/Ullage_motor  bigthumbsup 



Celebrating the birth of KELPkidJR on August 5, 2009 :-)
User currently offlineDashTrash From United States of America, joined Aug 2006, 1528 posts, RR: 2
Reply 15, posted (5 years 2 weeks 5 days 7 hours ago) and read 4654 times:



Quoting KELPkid (Reply 14):
http://en.wikipedia.org/wiki/Ullage_motor bigthumbsup

Didn't know they were called that!  Big grin


User currently offlineJetstar From United States of America, joined May 2003, 1648 posts, RR: 10
Reply 16, posted (5 years 2 weeks 5 days 6 hours ago) and read 4643 times:
Support Airliners.net - become a First Class Member!

On the 4 engine Lockheed JetStar bizjet, we would check the thrust reversers by extending them during taxi, we would only do this the first flight of the day. A lot of times to save fuel we would taxi out on 2 engines and when we reached the check reversers part of the taxi check list, we would hold off continuing the check list until we started the remaining 2 engines and tested the reversers.

We could extend all the reversers with only # 2 engine running because #2 engine powered the #1 hydraulic system, which supplied hydraulic power to all the reversers. But part of the test was to see engine rpm increase when the reversers were extended so we waited until all the engines were running.

On the ground, we used the electric hydraulic pump to power the #1 hydraulic system so we could extend and retract the reversers as needed. Part of the preflight was to bleed all the hydraulic pressure off, including all the accumulators, both the brake and reverser accumulators held pressure because they were designed to operate the systems in case of a hydraulic failure, so the only way to bleed pressure off was to operate the brakes and reversers. We could get about 5 brake applications and extend, retract and partially extend all 4 reversers just on full accumulator pressure.

On the JetStar some operators on a windy day would extend the reversers while the aircraft was parked to prevent the wind from blowing up the tailpipe. If I remember correctly there was a 30 knot wind restriction when starting the engines with the wind blowing up the tailpipe, it was an approved procedure to start the engines in this wind condition with the reverser extended and retract the reverser once the engine reached idle.

JetStar


User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 17, posted (5 years 2 weeks 2 days 5 hours ago) and read 4420 times:



Quoting DashTrash (Reply 4):
We check them in a lot of bizjets.

Dash is right, most business aircraft check them. I've seen most Citations running them on taxi out.

On the Gulfstream it's a first flight of the day item, either check them both at the same time or one at a time. In fact it's an AFM limitation, once every 100 hours or 100 flights, whichever comes first (though you use them all the time). Sometimes taxi speed gets high, poping a reverser will help to slow you down a bit..just idle reverse though.

DeltaGuy


User currently offlineJoseKMLB From United States of America, joined May 2008, 493 posts, RR: 0
Reply 18, posted (5 years 1 week 5 days 8 hours ago) and read 4200 times:

About a week ago I serviced a DC-9 for the U.S. Marines and they had the reverser's deployed on the ramp and they said they leave it like that for RON's. I just thought that was kind of weired pulling up to see them deployed.

User currently offlineBoeing767mech From United States of America, joined Dec 2000, 1027 posts, RR: 3
Reply 19, posted (5 years 1 week 4 days 20 hours ago) and read 4127 times:

According to a mechanic I used to work with, he said the USAF would deploy the reversers on the C-5 while taxi out to the runway to check and clear the water out of the cascade vanes. This was common practice until it was known to be a cause of a C-5 sn#68-0228 to crash after take-off in Ramstein Air Base Germany.

http://rustyknight98.com/C5/C5.htm
http://aviation-safety.net/database/record.php?id=19900829-0

David



Never under-estimate the predictably of stupidty
Top Of Page
Forum Index

Reply To This Topic Preflight Check: Thrust Reversers
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Thrust Reversers posted Thu Mar 26 2009 22:52:09 by Propilot83
A Couple Of Questions On Thrust Reversers posted Fri Mar 20 2009 13:41:48 by ATA1011Tristar
Another Question Regarding Thrust Reversers (AA) posted Sun Nov 9 2008 18:45:39 by AA757MIA
Thrust Reversers Open During Taxi posted Fri Jul 18 2008 07:49:09 by Bruin787
Thrust Reversers Before Touchdown? posted Mon Jul 7 2008 22:29:41 by DocLightning
First Thrust Reversers? posted Mon May 26 2008 22:15:04 by ThreeFourThree
Why Only 2 Thrust Reversers On The A380? posted Fri Apr 11 2008 18:41:17 by UltimateDelta
Why Have Thrust Reversers At All? posted Sat Jan 12 2008 02:08:02 by Faro
Jet-Liners Without Thrust Reversers posted Sat Dec 1 2007 11:02:40 by 747Dreamlifter
A380 Thrust Reversers? posted Sun Nov 11 2007 00:18:41 by 747Dreamlifter

Sponsor Message:
Printer friendly format