Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
737, A/T And Limit Speeds Qs  
User currently offlinesmartt1982 From United Kingdom, joined Nov 2007, 212 posts, RR: 0
Posted (10 months 2 weeks 2 days 17 hours ago) and read 2078 times:		 Support Airliners.net - become a First Class Member!

With the auto throttle on the 737 does it always take its inputs from the captains side no matter what or was this just something that would be the case depending on the model of the 737? I know on the Turkish Airliner crash into EHAM the throttles retarded because of the faultly RA on the captains side, is this always the case no matter what, the A/T will always take inputs from the captains side?
Is this the same for the limit speeds for the Flap blowback, were will the Flap system it take its inputs from in order to decide to do a blowback or not? (Captains or FOs PFD?)

2 replies: All unread, jump to last
 
User currently offlineRoseflyer From United States of America, joined Feb 2004, 8754 posts, RR: 52
Reply 1, posted (10 months 2 weeks 2 days 15 hours ago) and read 2057 times:

Quoting smartt1982 (Thread starter):
With the auto throttle on the 737 does it always take its inputs from the captains side no matter what or was this just something that would be the case depending on the model of the 737? I know on the Turkish Airliner crash into EHAM the throttles retarded because of the faultly RA on the captains side, is this always the case no matter what, the A/T will always take inputs from the captains side?

There was a software change with an associated Service Bulletin that changed the FCC/Autothrottle Computer to use inputs from both sides as a result of that crash.


If you have never designed an airplane part before, let the real designers do the work!
User currently offlineN243NW From United States of America, joined Jul 2003, 1494 posts, RR: 21
Reply 2, posted (10 months 2 weeks 1 day 8 hours ago) and read 1917 times:

Quoting Roseflyer (Reply 1):

There was a software change with an associated Service Bulletin that changed the FCC/Autothrottle Computer to use inputs from both sides as a result of that crash.

Correct, for the Rockwell Collins aircraft that are the most recent. For older aircraft that use the GE (Smiths) autothrottle computer, a separate service bulletin is said to be in the works but has not yet been released. There's also a service bulletin for the EGPWS that adds an audible "AIRSPEED LOW" callout so pilots have more warning of an impending stall.

Quoting smartt1982 (Thread starter):
Is this the same for the limit speeds for the Flap blowback, were will the Flap system it take its inputs from in order to decide to do a blowback or not? (Captains or FOs PFD?)

The flap blowback (flap load relief) function that you describe works through the FSEU and left ADIRU, so if the captain's air data system is not working properly, flap load relief will not be available.

[Edited 2012-07-13 20:10:46]


TCAS SYSTEM TEST OKAY.
Top Of Page
Forum Index

Reply To This Topic 737, A/T And Limit Speeds Qs
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...
AirTran 737's And De-Rated Takeoffs posted Mon Jun 8 2009 20:49:58 by Ward86IND
737 And It's Flat Engines posted Fri Aug 10 2007 02:52:56 by MPLSflyer
? On Pusher Twin Props And Vmc Speeds posted Sat May 26 2007 02:43:19 by FLY2HMO
Jetliners With Lowest Takeoff And Landing Speeds? posted Mon Feb 5 2007 02:27:26 by Blackbird
SAS 737 And Light Aircraft, Tcas Incident, Norway posted Mon Jun 5 2006 21:54:00 by MerlinIIIB
Seats At Back Of 737 And Its Speed posted Thu Apr 27 2006 16:45:42 by DeltaDC9
Takeoff And Landing Speeds B-747 posted Mon Dec 26 2005 18:08:58 by 707fan
Boeing 747-400 Takeoff And Landing Speeds posted Wed Aug 3 2005 02:42:04 by Qantas744ER
The Boeing 737, And Flight Time posted Sat Sep 20 2003 00:03:45 by Cancidas
Fastest Landing And Takeoff Speeds posted Fri Jul 5 2002 09:47:49 by Trent_800

Sponsor Message:
Printer friendly format