Darius
Topic Author
Posts: 139
Joined: Thu Jul 19, 2001 7:21 pm

A310 Slats At The Gate

Tue Sep 11, 2001 10:21 pm

Can any body tell me why the slats of an A310 are often (but not always) deployed when the a/c is at the gate? All other a/c I know retract the slats after landing (I don't know about the A300 though).
Below two pictures of A310's at a gate, with different slat positions.


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Photo © Ingo Richardt



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Photo © Antonio Saraiva

 
musang
Posts: 788
Joined: Sun Apr 08, 2001 4:11 am

RE: A310 Slats At The Gate

Thu Sep 13, 2001 3:41 am

I asked an engineer the same question a few years ago and he said its simply to reduce wear on the actuators. It effectively saves one slat extension/retraction per flight cycle.

The A300 does the same.

Regards - Musang
 
Guest

RE: A310 Slats At The Gate

Thu Sep 13, 2001 7:40 am

It may also have to do with the systems on the airplane. The 727 slats are hydraulic powered and they have a big tendency to droop when the pressure is turned off for shutdown as well as other flight control surfaces. This is true for alot of airliners when parked at the gate the stablizer is sitting with different positions on each side(Boeing anyway) as well as ailerons and such. The 747-400 slats are pneumatically powered.
 
310_engineer
Posts: 163
Joined: Tue Dec 05, 2000 7:16 am

RE: : ChrisHabgood

Thu Sep 13, 2001 8:27 am

What you are saying is only possible with the Krueger flaps. They are controlled by an hydraulic actuator, but the slats are controlled by screwjacks, gearboxes and torque tubes which are driven by a PDU (Power Drive Unit). The PDU is a sort of hudraulic motor.

Darius: the reason is explained by Musang

Mike
 
Guest

RE: : ChrisHabgood

Sat Sep 15, 2001 4:36 pm

I wasn't saying it about ONLY the kreuger flaps, it was a comment on the type of system the airplane uses. Alot of airliners control surfaces droop when the hydraulics are turned off and the pressure releases from the controls.
 
310_engineer
Posts: 163
Joined: Tue Dec 05, 2000 7:16 am

RE: ChrisHabgood

Sat Sep 15, 2001 8:15 pm

FYI We are talking about an A310 here and the slats just can't droop for the reason I explained in my previous post.
 
VASI
Posts: 187
Joined: Thu Aug 17, 2000 3:33 am

RE: A310 Slats At The Gate

Tue Sep 18, 2001 4:12 am

Hello!

As T know the MD-80 retracts the slats to 15° after landing and when taxiing to the gate and vice versa to the runway. This should prevent the engines from ingesting debris, but I don't know if this is really effective!

Best regards!


VASI
 
RyDawg82
Posts: 833
Joined: Fri Sep 14, 2001 8:30 am

RE: A310 Slats At The Gate

Sat Sep 22, 2001 8:09 am

I have never seen the MD-80 leave the slats down after retraction of the flaps...What airline practices this???
You can take the pup out of Alaska, but you can't take the Alaska out of the pup.
 
VASI
Posts: 187
Joined: Thu Aug 17, 2000 3:33 am

Rydawg82

Sun Sep 23, 2001 1:24 am

Hello!

I meant slats + flaps. I've seen this on SAS MD-80's
and Iberia MD-87's.

To my knowledge it is also compulsory in the normal "after landing checklist" to set the slats/flaps to 15° degrees after landing, to prevent this foreign object damage. The most importnat phase is during taxi, not at the gate!

Best regards!

VASI
 
Guest

RE: Rydawg82

Tue Sep 25, 2001 10:28 am

A major cause for the -80's being taken out of service is ground vehicle operations at least with the passenger airlines. At least at UPS we would NEVER have ground vehicle contact problems with flight control surfaces hanging out due to we NEVER EVER go under a wing/Horizontal stab.
 
Guest

A310 Engineer

Tue Sep 25, 2001 10:32 am

I was not rying to get into a discussion about the airbus primarily beacause airbus is SO much different than boeing I have not read up on systems with the airbus. My comments were only based on general systems or specific airplane systems knowledge based on the 727 or 757/767/747-400 type of systems.
 
DC-10Tech
Posts: 291
Joined: Fri Jun 15, 2001 6:40 pm

RE: A310 Slats At The Gate

Thu Sep 27, 2001 4:43 pm

Musang is absolutely right. At Express.net, the policy is to leave them deployed unless the aircraft will RON. At FedEx, I believe they retract them.

A310's and 300 have been known to have a lot of problems with the torque box failures (or, the plane thinks they have) and saving cycles sure helps out a lot with delays!
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