Airworthiness Directive · Amendment 39-22688 · Instruments
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, 777-200LR, 777-300, 777-300ER, and 777F series airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, 777-200LR, 777-300, 777- 300ER, and 777F series airplanes. This AD was prompted by reports of wing anti-ice (WAI) valve failure that can result in undetected structural damage to leading edge (LE) slat assemblies, and separately a failure of the autothrottle (A/T) to disconnect after the pilot manually advanced the throttle levers, which caused a low-speed condition during a go-around. This AD was also prompted by a determination that insufficient low-speed protection exists in the 777 fleet and a determination that the flightcrew may not recognize and properly respond to a multi-channel unreliable airspeed event. This AD requires installing certain new software and doing a software configuration check. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 777-31A0342, dated July 19, 2021, which is referred to in Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021.
(1) Where the Compliance Time columns of the tables in the “Compliance” paragraph of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, use the phrase “the original issue date of Requirements Bulletin 777-31A0342 RB,” this AD requires using the effective date of this AD.
(2) Where Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, specifies contacting Boeing for instructions for upgrading certain software: This AD requires doing the upgrade using a method approved in accordance with the procedures specified in paragraph (i) of this AD.
(3) Where the description in the Effectivity section of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, defines Group 1 airplanes as “Airplanes with Airplane Information Management System (AIMS)-2 with service bulletin 777-31-0294 incorporated,” this AD requires using “Airplanes with Airplane Information Management System (AIMS)-2 with a requirement to incorporate service bulletin 777-31-0294.”
(4) Where the description in the Effectivity section of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, defines Group 2 airplanes as “Airplanes with AIMS-2 with service bulletin 777-31-0331 incorporated,” this AD requires using “Airplanes with AIMS-2 with a requirement to incorporate service bulletin 777-31-0331.”
(5) Where the description in the Effectivity section of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, defines Group 3 airplanes as “Airplanes with AIMS-2 with service bulletin 777-31-0332 incorporated,” this AD requires using “Airplanes with AIMS-2 with a requirement to incorporate service bulletin 777-31-0332.”
(6) Where the description in the Effectivity section of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021, defines Group 5 airplanes as “Airplanes with Airplane Information Management System (AIMS)-,” this AD requires using “Airplanes with Airplane Information Management System (AIMS)-1 and airplanes equipped with AIMS-2 that are not in Group 1, 2, 3, or 4.” (That is, there are two subsets of Group 5 airplanes with different required actions.) For airplanes, that, as of the effective date of this AD, are equipped with AIMS-2 and are not in Group 1, 2, 3 or 4, this AD does not require Action 1 of Table 3 of the Accomplishment Instructions of Boeing Alert Requirements Bulletin 777-31A0342 RB, dated July 19, 2021.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
