28-28 Additional Center Tank Transfer System
- 28-28-01B ACT Auto Transfer System (Manual transfer from the ACT(s) to the center tank operative)
- 28-28-01C ACT Auto Transfer System (Fuel in the ACT(s) considered as not usable)
- 28-28-02C ACT Transfer Valve
- 28-28-05A ACT Inward Pressure Relief Valve
- 28-28-06A ACT Vent Valve (Manual transfer from the ACT(s) to the center tank operative)
- 28-28-06B ACT Vent Valve (Fuel in the ACT(s) considered as not usable)
- 28-28-09C ACT 1 Inlet Valve
- 28-28-10D ACT 2 Inlet Valve (If Installed)