AD 2010-20-23 Airworthiness Directives; Bombardier-Rotax GmbH Type 912 F, 912 S, and 914 F Series Reciprocating Engines

Makes named: rotax. Read the applicability below — it usually turns on serial or part numbers too.

This AD is applicable to Bombardier-Rotax GmbH type 912 F series, 912 S series, and 914 F series reciprocating engines that have a crankcase serial-numbered 27811 or lower, installed. These engines are installed on, but not limited to, Aeromot-Industria Mecanico Metalurgica Itda AMT-300; Aquila Technische Entwiklugen GmbH AQUILA AT01; Diamond Aircraft Industries DA-20A1; Diamond Aircraft Industries GmbH Models HK36TC, HK36TTC, HK36TTC-ECO, and HK36TTS; Iniziative Industriali Italiane S.p.A. Sky Arrow 650 series; SCHEIBE-Flugzeugnau GmbH SF 25C; and Stemme S10-VT aircraft.

You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Determining the Crankcase Serial Number (S/N) (f) Determine if your crankcase is affected by looking at the S/N in the area indicated by XXX, following “Made in Austria,” as shown on Figure 2 of this AD. The marking is on both crankcase halves. Initial Inspection (g) Within 50 hours time-in-service (TIS) from the effective date of this AD, perform a visual inspection as follows: (1) Inspect the engine crankcase (item 1, Figure 1 of this AD) for cracks especially in the area of cylinder 1 upper side (item 2), between cylinder 1 and 3 upper side (item 3), cylinder 4 lower-right side (item 4) and detailed inspection in the area identified in Figure 2 (item 5) of this AD. Information concerning this inspection can be found in Bombardier-Rotax Mandatory Service Bulletins No. SB-912-029, Revision 3, dated July 11, 2006 and No. SB-914-018, Revision 3, dated July 11, 2006. BILLING CODE 4910-13-P ER04OC10.060 ER04OC10.061 BILLING CODE 4910-13-C (2) Cracks in crankcases of engines with a ROTAX cooling air baffle may not be easily visible, and oil leaks may be an indication of cracks. Visually inspect for oil leaks in areas of cylinder 1 upper side (item 2, Figure 1 of this AD) and between cylinder 1 and cylinder 3 upper side (item 3). (3) If you find oil leaks, determine the source by either using a borescope or removing the object blocking the view such as the air baffle or accessory, and perform the inspection. (4) If the engine crankcase is cracked, remove the engine from service before further flight. Repetitive Inspections (h) Visually inspect the engine crankcase (item 1, Figure 1 of this AD) for cracks at each 100-hour, annual, or progressive inspection, or within 110 hours TIS since last inspection, whichever occurs first, in accordance with paragraphs (g)(1) through (g)(4) of this AD. Alternative Methods of

This AD results from an increase in the affected engine crankcase population. We are issuing this AD to prevent oil loss caused by cracks in the engine crankcase, which could lead to in-flight failure of the engine and forced landing.