Airworthiness Directive · Amendment 39-17938 · Auto flight
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 737-22A1215, dated November 22, 2013.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-600, -700, -700C, -800, and -900 series airplanes. This AD was prompted by reports in which a single, undetected, erroneous radio altimeter output caused the autothrottle to enter landing flare retard mode prematurely on approach. This AD requires removing certain autothrottle computers and installing a new or reworked autothrottle computer. We are issuing this AD to prevent a single, undetected, erroneous radio altimeter output from causing premature autothrottle landing flare retard and subsequent loss of automatic speed control, which could result in loss of control of the airplane.
Within 36 months after the effective date of this AD, do the actions specified in paragraphs (g)(1) and (g)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 737-22A1215, dated November 22, 2013.
(1) Remove any autothrottle computer, part number (P/N) 760SUE1-1 (Boeing P/N 10-62017-51), 760SUE2-2 (Boeing P/N 10-62017-52), 760SUE2-3 (Boeing P/N 10-62017-53), or 760SUE2-4 (Boeing P/N 10-62017-54), from the E1-1 electronics shelf.
(2) Install a new or reworked autothrottle computer, P/N 760SUE2-5 (Boeing P/N 10-62017-55) at the E1-1 electronics shelf.
