Well done to the crew
4.1.2 The aircraft manufacturer Boeing Aircraft Company on 08 June 2009
issued an Alert Service Bulletin (ASB) no. 747-78A2181 titled, Exhaust -
Thrust Reverser Control System – Automatic Leading Edge Flap
Retraction System Wiring Change, in order to change the signal to the
FCU.
Implementation of this change allowed for the Group ‘A’ LE flaps to auto-
retract only when the thrust reversers are commanded by lifting the
reverse thrust handle. The change given in this ASB was to be
implemented within 90 days after the issue date.
The ASB also stated that the FAA will possibly release an AD related to
this service bulletin. The AD will make the compliance tasks given in this
service bulletin mandatory.