9 CI_ 23 Oct 2014 990080 ACB 8 Modification-Tail Compartment Ladder Airframe [30 DAY Initial Reg.] 360.6 Hrs 141 CI_ 06 Nov 2008 4.00 ACB 9 Operational Limitations Auxiliary Power Unit 990090 (APU) Airframe [21 DAY Initial Reg.] 564.2 Hrs 191 CI_ 29 May 2009 ACB 9A Operational Limitations - Auxiliary Power Unit 990091 (APU