Airworthiness Directive · Amendment 39-17778 · Navigation
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 777-34A0192, dated December 14, 2012.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD requires, for certain airplanes, replacing radio altimeter transceivers with upgraded units, and, for all airplanes, replacing low range radio altimeter antennas with new antennas. This AD was prompted by operator reports of erratic low range radio altimeter (LRRA) operation while the airplane is airborne. We are issuing this AD to prevent adverse system responses and flight deck effects that could result in loss of controllability of the airplane or landing short of the runway during landing.
For airplanes identified in Boeing Alert Service Bulletin 777-34A0191, Revision 1, dated March 23, 2012: Within 24 months after the effective date of this AD, replace radio altimeter transceivers with upgraded units, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 777-34A0191, Revision 1, dated March 23, 2012.
For all airplanes: Within 36 months after the effective date of this AD, replace low range radio altimeter transmit and receive antennas with new antennas, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 777-34A0192, dated December 14, 2012.
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.
Aircraft
