Leskova From Germany, joined Oct 2003, 6075 posts, RR: 68
Reply 6, posted (11 years 9 months 4 days 17 hours ago) and read 2540 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).