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Are Rudder Problems On 737NG Still An Issue?  
User currently offlineGalvanair777 From United States of America, joined Apr 2005, 39 posts, RR: 0
Posted (10 years 9 months 3 weeks 1 day 9 hours ago) and read 2266 times:

As we move into the 21st century with the most popular airplane in history, My question is are rudder problems still evident on the 737NGs or did Boeing correct them?


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6 replies: All unread, jump to last
 
User currently offlineGigneil From United States of America, joined Nov 2002, 16347 posts, RR: 84
Reply 1, posted (10 years 9 months 3 weeks 1 day 9 hours ago) and read 2258 times:

I believe the rudder issues were confined to the classic 737s.

N


User currently offlineWedgetail737 From United States of America, joined Aug 2003, 5910 posts, RR: 6
Reply 2, posted (10 years 9 months 3 weeks 1 day 9 hours ago) and read 2257 times:
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Yes, Boeing corrected the problems with the rudder systems on the 737NG's a few years ago.

User currently offlineJhooper From United States of America, joined Dec 2001, 6204 posts, RR: 12
Reply 3, posted (10 years 9 months 3 weeks 1 day 9 hours ago) and read 2217 times:

...is that to say that rudders are still a problem with the -200s and -300s?


Last year 1,944 New Yorkers saw something and said something.
User currently offlineWedgetail737 From United States of America, joined Aug 2003, 5910 posts, RR: 6
Reply 4, posted (10 years 9 months 3 weeks 1 day 8 hours ago) and read 2214 times:
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I believe there were service bulletins and directives to inspect and replace rudder systems on 737 classics. All airlines were required to fix their rudders...at least in the U.S.

User currently offlineWedgetail737 From United States of America, joined Aug 2003, 5910 posts, RR: 6
Reply 5, posted (10 years 9 months 3 weeks 1 day 8 hours ago) and read 2214 times:
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I believe there were service bulletins and directives to inspect and replace rudder systems on 737 classics. All airlines were required to fix their rudders...at least in the U.S.

User currently offlineLeskova From Germany, joined Oct 2003, 6075 posts, RR: 70
Reply 6, posted (10 years 9 months 3 weeks 1 day 5 hours ago) and read 2141 times:

Actually, AD-2002-20-07 is titled

Airworthiness Directives; Boeing Model 737 Series Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.

and the summary reads

SUMMARY: This amendment supersedes seven existing airworthiness
directives (ADs), applicable to certain Boeing Model 737 series
airplanes that, among other things, currently require replacing the
main rudder power control unit (PCU) and PCU vernier control rod bolts;
testing the main rudder PCU to detect certain discrepancies and to
verify proper operation of the PCU; and revising the FAA-approved
Airplane Flight Manual procedures to correct a jammed or restricted
flight control condition. Instead, this amendment requires installation
of a new rudder control system and changes to the adjacent systems to
accommodate that new rudder control system. This amendment is prompted
by FAA determinations that the existing system design architecture is
unsafe due to inherent failure modes, including single-jam modes and
certain latent failures or jams, which, when combined with a second
failure or jam, could cause an uncommanded rudder hardover event and
consequent loss of control of the airplane. Additionally, the current
rudder operational procedure is not effective throughout the entire
flight envelope. The actions specified by the proposed AD are intended
to prevent the identified unsafe condition.


and as one can read further down

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 FR / LFRK), France">CFR part 39) by superseding AD 97-14-04,
amendment 39-10061 (62 FR 35068, June 30, 1997), which is applicable to
certain Boeing Model 737-100, -200, -300, -400, and -500 series
airplanes; and AD 2000-22-02 R1, amendment 39-11948 (65 FR 69239,
November 16, 2000), which is applicable to all Boeing Model 737 series
airplanes; was published in the Federal Register on November 13, 2001
(66 FR 56783). The action proposed to require installation of a new
rudder control system and changes to the adjacent systems to
accommodate that new rudder control system.



This, to me, really sounds as if this is not just about the classics, but about all 737s (which, incidentally, is also the way I remember it from the reporting at the time).

The full text is available at
Docket No. 2001-NM-251-AD; Amendment 39-12903; AD 2002-20-07



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