See SB for affected a/c as it is too many to list here.
Purchase: It has been determined that 505590-401 Reel Assemblies (505589-401 Inertial Reels) with a data code of A0408 or A0508 may not operate correctly and shall be replaced with 505590-403 Reel Assemblies. A check for correct operation shall be accomplished on 505590-401 Inertia Reels with date code other than A0408 or A0508, and if necessary they shall be replaced as described in this Service Bulletin.
Compliance: Mandatory; shall be accomplished within the next 100 hours of operation or 12 months (annual inspection), whichever occurs first.
CREDIT INFORMATION: March 15, 2011