Airworthiness Directive · Amendment 39-12846 · Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines
Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines
This airworthiness directive (AD) is applicable to Bombardier- Rotax GmbH type 912 F, 912 S, and 914 F series reciprocating engines with the serial numbers (SN's) in Table 1 of this AD, and all engines that have been converted to a single valve spring arrangement at engine repair or general overhaul. Table 1 follows: Table 1.--Engine Series by SN Engine model Engine SN 912 F........................................ 4,412.757 to 4,412.794 4,412.796 to 4,412.807 912 S........................................ 4,922.501 to 4,922.534 4,922.536 to 4,922.552 4,922.554 to 4,922.577 4,922.579 to 4,922.636 914 F........................................ 4,420.039 to 4,420.048 4,420.050 to 4,420.067 4,420.069 to 4,420.082 4,420.084 to 4,420.097 4,420.099 to 4,420.114 4,420.116 to 4,420.155 4,420.157 to 4,420.253 These engines are installed on, but not limited to, Diamond Aircraft Industries, DA20-A1, Diamond Aircraft Industries GmbH Model HK 36 TTS, Model HK 36TTC, and Model HK 36 TTC-ECO, Iniziative Industriali Italiane S.p.A. Sky Arrow 650 TC and Sky Arrow 650 TCN, Aeromot-Industria Mecanico Metalurgica ltda., Models AMT-300 and AMT-200S, and Stemme S10-VT aircraft.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain serial numbers (SN's) of Bombardier-Rotax GmbH type 912 F, 912 S and 914 F series reciprocating engines. This action requires replacement of the valve spring retainers, part number (P/N) 854.182, with the new-reinforced valve spring retainers, P/N 854.184. This amendment is prompted by reports of several cracked valve spring retainers discovered in-service. The actions specified in this AD are intended to prevent cracking of the valve spring retainers resulting in possible engine failure while in-flight.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
