ved. A General Dynamics Company EFTA00620940 L TYP Logbook Code Description Effectivity aintenance Notes AD Engine 1 993010 AD 2010.2505 Rolls Royce HP Turbine Stage 2 Disc Effective Jan 13. 2011. Applies to Disc listed in Table 2 of the AD. see 993007 / 993008 for Stage 1 AD 993010 AD 2010.