Pratt & Whitney has recently released SB30393 recommending that the Electronic Engine Control (EEC) support brackets be replaced within 300 hours to help eliminate problems due to vibratory stresses. This SB applies to engine SN DF0123 and before.
At the same time, Commercial Support Program Notification 1004513 was released providing parts and labor support for those operators wishing to comply with the SB.
Honeywell Issues Service Bulletin For Painting of Bypass Ducts
Gulfstream GIV: Troubleshooting High Engine RPMs
Another Option To Complete Honeywell Service Bulletin Before Deadline
Deadline Approaching For The ECU Update For Honeywell HTF7000 Engines on Challenger 300
Honeywell Bimodal Service Bulletin Update