Airworthiness Directive · Amendment 39-15585 · Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
Boeing Model 747-400, 747-400D, and 747-400F Series Airplanes
This AD applies to Boeing Model 747-400, 747-400D, and 747-400F series airplanes, certificated in any category; as identified in Boeing Service Bulletin 747-31-2368, Revision 1, dated July 24, 2006.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-400, 747-400D, and 747-400F series airplanes. This AD requires replacement of an electronic flight instrument system/ engine indicating and crew alerting system (EFIS/EICAS) interface unit (EIU) located on the E2-6 shelf of the main equipment center with a new or modified EIU. This AD results from two instances where all six integrated display units (IDUs) on the flight deck panels went blank in flight. We are issuing this AD to prevent loss of the IDUs due to failure of all three EIUs, which could result in the inability of the flightcrew to maintain safe flight and landing of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 24 months after the effective date of this AD, replace at least one of the three EIUs, part number (P/N) 622-8589-104, located on the E2-6 shelf of the main equipment center with a new or modified EIU, P/N 622-8589-105, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-31-2368, Revision 1, dated July 24, 2006.
Note 1: Boeing Service Bulletin 747-31-2368, Revision 1, dated July 24, 2006, refers to Rockwell Collins Service Bulletin EIU-7000-31-502, dated March 21, 2006, as an additional source of service information for modifying an EIU by adding auto restart circuitry, which converts EIU P/N 622-8589-104 to P/N 622-8589-105.
Actions done before the effective date of this AD in accordance with Boeing Service Bulletin 747-31-2368, dated November 22, 2005 (Revision 1 of the service bulletin specifies that the original issue is dated December 1, 2005), are acceptable for compliance with the corresponding requirements of paragraph (f) of this AD.
Replacing an EIU with a new or modified EIU in accordance with paragraph (f) of this AD constitutes terminating action for the EIU replacement of paragraph (d)(1) of AD 2004-10-05, provided that the other two EIUs are replaced with EIUs having P/N 622-8589-104 or P/N 622-8589-105. All other actions required by paragraph (d)(1) of AD 2004-10-05 must be complied with.
